Installation of Overhead Transmission Lines

RESTRICTED May 2008

Document ID : SP-1101 (ERD-63-04) Ver-2 Filing key : Business Control

Petr Pe trol oleum eum Develo Development pment Oman L.L.C. L.L.C. Electrical Infrastructure

Specification fo r Installation Installation of Overhead Transmission Lines

User Note: The requirements of this document are mandatory. Non-compliance shall only be authorised by the Document Owner or his Delegate through STEP-OUT approval. approval. A controlled copy of the current version of this document is on PDO's EDMS. Before making reference to this document, it is the user's responsibility to ensure that any hard copy, or electronic copy, is current. For assistance, contact the Document Custodian Custodian or the Document Controller . Users are encouraged to participate in the ongoing improvement of this document by providing constructive feedback .

Please familiarise yourself with the Document Security Classification Definitions They also apply to this Document!

Petroleum Development Oman LLC

Version: 2.0 Effective: May-08

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SP-1101: Specification for Installation of Overhead Transmission

Printed 26/06/08

The controlled version of this CMF Document resides online in Livelink®. Printed copies are UNCONTROLLED.


ii


Revision Re vision History

The following is a brief summary summary of the 4 most recent revisions to this document. document. Details of all revisions revisions prior to these are held held on file by the the issuing department. department.

Version No.

Date

Author

Scope / Remarks

Version 0 Version 1.0

Nov 86 June 99

Version 2.0

May 08

BEB/4 Ali Al Raisi, OIE/23 Said Al Shuley, UIE/6

Original issued as ERD-63-04 Converted to Specification as per PDO Policy Cascade & minor changes to the text. Generally updated.

iii

Related Re lated Busin ess Proce Processes sses Cod e

Page 4

Business Process (EPBM 4.0)


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Contents 1.

Introduction...............................................................................................................7 1.1 1.2

PURPOSE........................................... ............................................ ............................. 7 APPLICABLE STANDARDS, STANDARDS, SPECIFICATIONS SPECIFICATIONS AND AND CODES........................... CODES.. ......................... 7 1.2.1 1.2.2 1.2.3

2.

PDO Standards........................... Standards...................................... ....................... ....................... ...................... ....................... ....................... ...................... ................ ..... 7 SIOP/SIEP Standards........................... Standards....................................... ....................... ...................... ...................... ....................... ...................... ................. ....... 8 International Standards ..................... ................................ ....................... ....................... ...................... ...................... ....................... .....................8 .........8

1.3

COMPLIANCE WITH STANDARDS STANDARDS .............................................. ....................... 12

1.4

ENGINEERING ENGINEERING DOCUMENTS TO BE SUBMITTED SUBMITTED FOR APPROVAL............ 13

Scope........................................................... Scope............................. .............................................................. ............................................................. ..............................13 .13 2.1

GENERAL...................................................... ........................................... ................ 14 2.1.1

2.2

Access to Site............................ Site........................................ ....................... ....................... ...................... ...................... ....................... ....................... ............... ... 14

SITE PRELIMINARIES PRELIMINARIES AND AND PREPARATORY PREPARATORY WORKS............................ WORKS............................ ......... 14 2.2.1 Soil Investigations..................... Investigations................................ ...................... ...................... ....................... ....................... ...................... ...................... ................ ..... 14 2.2.2 Line Route Survey ...................... ................................. ...................... ...................... ....................... ....................... ...................... ...................... .............. ... 14 2.2.2.1 Centre Line Survey ..................... ................................. ....................... ...................... ....................... ...................... ...................... ............... ... 14 2.2.2.2 Detail Survey, line profiles and structure spotting.......................... spotting..................................... ...................15 ........15 2.2.2.3 Clearances............................ Clearances........................................ ...................... ...................... ....................... ...................... ...................... ......................16 ...........16 2.2.2.4 Structure schedule......................... schedule..................................... ....................... ...................... ....................... ....................... ...................... ............. 16 2.2.3 Route Clearance ...................... ................................. ....................... ....................... ...................... ...................... ....................... ...................... ................. ....... 16 2.2.3.1 Vegetation........................ Vegetation................................... ....................... ....................... ...................... ....................... ...................... ...................... ............... ... 16 2.2.4 Pegging Out ...................... ................................. ...................... ...................... ....................... ....................... ....................... ...................... ...................... .............. 16 2.2.5 Crossings........................ Crossings................................... ....................... ....................... ...................... ...................... ....................... ....................... ...................... ............... .... 17 2.2.5.1 Road and Service Crossings ...................... ................................. ...................... ...................... ....................... ...................... ............ 17 2.2.5.2 Other Crossings ...................... .................................. ....................... ...................... ....................... ....................... ...................... .................. ....... 17

2.3

LINE ERECTION ...................................... ........................................... .................... 17 2.3.1 Safety ..................... ................................ ....................... ....................... ....................... ....................... ...................... ...................... ....................... .......................17 ...........17 2.3.2. Erection of Wooden Poles Lines.................... Lines................................ ....................... ....................... ...................... ..................... ................. ...... 18 2.3.2.1 Handling, Transportation and Storage of Wooden Poles.................... Poles............................... ............... .... 18 2.3.2.2 Erection of Wooden Poles ........................ ................................... ....................... ....................... ...................... ......................18 ...........18 2.3.2.2.1 Preparation........................... Preparation...................................... ...................... ...................... ....................... ...................... ...................... .............. 18 2.3.2.2.2 Sub-assemblies ....................... .................................. ...................... ....................... ....................... ...................... ....................19 .........19 2.3.2.2.3 Structure erection and alignment ...................... ................................. ...................... ..................... ................. ....... 19 2.3.2.2.4 Wooden Poles Foundations ........................ .................................... ....................... ...................... ......................19 ...........19 2.3.2.2.5 Stays.................. Stays.............................. ....................... ....................... ...................... ...................... ....................... ....................... ...................20 .......20 2.3.2.3 Earthing and Bonding of Poles ..................... ................................ ....................... ....................... ...................... ...................20 ........20 2.3.3 Erection of Lines with Lattice Steel Towers............................ Towers....................................... ...................... ...................... .............. ... 20 2.3.3.1 Foundations for Lattice Steel Towers ....................... .................................. ....................... ....................... .................. ....... 20 2.3.3.1.1 General....................... General.................................. ...................... ....................... ...................... ...................... ....................... ....................... ............... ... 20 2.3.3.1.2 Site Preparation......................... Preparation.................................... ....................... ...................... ...................... ....................... ......................21 ...........21 2.3.3.1.3 Concrete.............................. Concrete.......................................... ....................... ...................... ....................... ....................... ...................... ................ ..... 21 2.3.3.1.4 Cement............................ Cement....................................... ....................... ....................... ....................... ...................... ...................... .....................22 .........22 2.3.3.1.5 Reinforcing Steel ...................... ................................. ....................... ....................... ...................... ...................... ......................22 ...........22 2.3.3.1.6 Excavation and Backfilling.................... Backfilling............................... ...................... ...................... ...................... .....................22 ..........22 2.3.3.1.7 Installation of Foundations ....................... ................................... ....................... ...................... ...................... ................. ...... 22 2.3.3.1.8 Bored Piles Installation............................ Installation........................................ ....................... ...................... ...................... .................. ....... 23 2.3.3.1.9 Protection of Foundations............................ Foundations....................................... ...................... ...................... ....................... ............... ... 24 2.3.3.2 Erection of Lattice Steel Towers.................... Towers............................... ...................... ...................... ...................... ...................24 ........24 2.3.3.2.1 General................... General.............................. ...................... ....................... ....................... ....................... ...................... ...................... ............... ... 24 2.3.3.2.2 Handling and Storage of Steel Towers ..................... ................................ ...................... ....................24 .........24

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2.3.3.2.3 Erection of Steel Towers ......................................................................... 25 2.3.3.2.4 Tolerances for Installation of Steel Towers............................................. 26 2.3.3.3 Aircraft Warning Painting................................................................................. 26 2.3.3.3.1 General .................................................................................................... 26 2.3.3.3.2 Surface Preparation ................................................................................. 27 2.3.3.3.3 Preparation of coating materials .............................................................. 27 2.3.3.3.4 Painting of Steel Towers ......................................................................... 27 2.3.3.3.5 Responsibilities and Guarantees.............................................................. 28 2.3.4 Conductor Stringing .................................................................................................... 28 2.3.4.1 Preparation ........................................................................................................ 28 2.3.4.2 Equipment and Tools......................................................................................... 29 2.3.4.3 Drum Lengths and Joints................................................................................... 30 2.3.4.4 Conductor Damage............................................................................................ 30 2.3.4.5 Stringing Procedure........................................................................................... 31 2.3.4.6 Sags and Tensions ............................................................................................. 31

2.4

INSPECTION AND TESTING................ ............................................... .................. 32 2.4.1 Tests During Erection.................................................................................................. 32 2.4.1.1 Conductor Joint Tests........................................................................................ 32 2.4.1.2 Cable Tests ........................................................................................................ 32 2.4.2 Inspection .................................................................................................................... 33 2.4.2.1 Inspection During Erection ............................................................................... 33 2.4.2.2 Final Inspection ................................................................................................. 33 2.4.3 Pre-Commissioning Tests............................................................................................ 33

2.5

MAINTENANCE ........................................ ............................................ .................. 34

2.6

CHECK SHEETS AND SCHEDULES..................................................................... 34 2.6.1. 2.6.2.

2.7

Overhead Lines on Wooden Poles .............................................................................. 34 Overhead Lines with Lattice Steel Towers .................................................................. 34

AS-BUILT DRAWINGS................................................... ........................................ 35

APPENDICES APPENDIX A : GLOSSARY OF DEFINITIONS, TERMS AND ABBREVIATIONS.......................... 36 SP USER-COMMENT FORM .................................................................................................................. 37

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1.

Introduction

1.1

PURPOSE


This Specification is applicable to 132 and 33 kV overhead lines constructed using wood poles and steel lattice towers. Specifications SP-1114A and SP-1114B and SP-1102 specify the design basis for 132 and 33 kV overhead lines and include detailed general arrangement drawings for all types of structures. It shall be the responsibility of the Contractor to ensure that lines are profiled and the structures are spotted in such a way that the standard design limits are not exceeded.

1.2

APPLICABLE STANDARDS, SPECIFICATIONS AND CODES The following Standards, specifications and codes should be consulted when applying the requirement of this Standard. All listed documents shall be latest issue except those documents prescribed by date.

1.2.1

Page 7

PDO Standards HSESM

Health Safety and Environmental Protection Standards Manual

ERD-00-05

Handover and As built Documentation.

ERD-00-06

Preparation & Content of Engineering Drawings

ERD-00-14

Project drawing Procedures.

ERD-11-02

Site Selection and Soil Investigation Manual.

ERD-19-07

Civil & Building Guide to Concrete

SP-1011

Specification for Installation of Overhead Transmission Lines.

SR-1099

Specification for Electrical Installation Practice.

SP-1100

Specification for Testing and Commissioning of Electrical Equipment

SP-1102

Specification for Design of 33 kV Overhead Power Lines.

SP-1103

Specification for Electrical Engineering Guidelines (Amendment/supplement to DEP 33.64.10.10.)

SP-1104

Electrical Safety Rules.

SP-1105

Electrical Standard Drawings.

SP-1106

Specification for Coding and Identification of Overhead Line Systems

SP-1107

Electrical Protection Systems.

SP-1108

Electrical safety Operating Procedures.

SP-1109

Specification for Earthing and Bonding.

SP-1111

Specification for Temporary Electrical Supplies for Construction & Maintenance Work.

SP-1114A

Specification for Design of 132kV Overhead Power Lines on Wooden Poles.

SP-1114B

Specification for Design of 132/220kV Overhead Power Lines on Steel Towers.

SP-1127

Layout and spacing of Plant Equipment and Facilities.


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1.2.2

1.2.3


SP-1131

Handover & As-Built Documentation.

SP-1171

Specification for Quality Assurance of Design, Construction and Engineering Works

SIOP/SIEP Standar ds DEP 33.64.10.10-Gen

Electrical Engineering Guidelines.

DEP 34.11.00.11-Gen

Site Preparation and Earthworks.

DEP 63.10.08.11-Gen

Field Commissioning & Maintenance of Electrical Installation and Equipment.

DEP 34.11.00.10-Gen

Site Investigation

Internatio nal Standards 1. Design of Overhead Lines

IEEE ANSI C2 - 2002 National Electrical Safety Code. ASCE No. 74

Guidelines for Electrical Transmission Line Structural Loading

DIN VDE 0210

Planning and Design of OHTL with Rated Voltage above 1 kV

EN 50341

Overhead Electrical Lines Exceeding AC 45kV

IEEE:524:1992

Guide to Installation of Overhead Transmission Line Conductors.

ICAO

International Standards and Recommended Practices AERODROMES Annex 14 to the Convention of International Civil Aviation, Volume 1, Aerodrome Design and Operations, Chapter 6, Visual Aids for Denoting Obstacles. +Aerodrome design manual paragraph 14.7, Obstacle lighting hightension overhead wires Air Navigation Services-Aircraft Operation (PANSOPS doc.8168)

2. Steel Lattice Towers for Overhead Lines

ASCE 10-97

Design of Latticed Steel Transmission Structures

ASCE Manual No. 52

Design of lattice steel towers - Code of practice for strength assessment of members of lattice towers and masts

ASTM A 36

Standard Specifications for Structural Steel.

ASTM A 394

Standard Specification for zinc coated steel transmission tower bolts.

ASTM A 572

High Strength Structural Steel, Grade 50

ASTM A588/588M-94 Standard Specification for High-Strength Low-Alloy Structural Steel with 50ksi (345Mpa) Minimum Yield Point.

Page 8

BS 4:Part 1-1993

Structural Steel Sections. Specification for Hot-Rolled Sections

BS 729:1971(1986)

Specification for Hot Dip Galvanised Coatings on Iron and Steel Articles.

BS 3436

Specification for ingot zinc

BS 3643:Part 2-1998

ISO Metric Screw Threads

BS 4102-1998

Barbed Wire

BS 4190 : 2001

ISO Metric Black Hexagon Bolts, Screws and Nuts-Specification

BS 4360

Specification for Weldable Structural Steel


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BS 4464-1998

Specification for Spring Washers for general engineering and automobile purposes-Metric Series

BS 4848:Part 4

Specification for Hot – Rolled Structural Steel Section. Equal and unequal angles

BS 4872:Part 1:1999

Specification for approval testing of welders when welding procedure approval is not required – Fusion welding of steel

BS 5135:1984

Specification for arc welding of carbon and carbon manganese steels

BS 5493:1977

Code of practice for protective coating of iron and steel structures against corrosion

BS 5950-1:2000

Structural Use of Steelwork in Building.

BS 7361-6

Coatings on Metal Fasteners - PART 6: Specification for Hot Dipped Galvanized Coatings

BS DD133

Code of Practice for Strength Assessment of Members of Lattice Towers and Masts

BS EN 1990:2002

Eurocode – Basis of structural design

BS EN 10025:1993

Specification for hot-rolled products of non-alloy structural steels and their technical delivery conditions

BS EN 10029:1991

Specification for tolerances on dimensions, shape and mass for hot-rolled steel plates 3 mm thick or above.

BS EN 10056-2-1993

Specification for structural steel equal and unequal leg angle. Tolerances on shape and dimensions

BS EN 10113-1993

Hot-rolled products in weldable fine grain structural steels

BS EN 10155:1993

Structural steels with improved atmospheric corrosion resistance. Technical delivery conditions

BS EN 10163-1991

Specification for Delivery Requirements for Surface Conditions of HotRolled Steel Plate, Wide Flats and Sections

BS-EN-ISO-1461-1999 Specification for Hot Dip Galvanising of Structural Steel. IEC 60652/2002

Testing of Towers

IEC 60826

Loading and strength of overhead transmission lines

ISO 1459:1973

Metallic coatings – Protection against corrosion by hot-dip galvanizing – Guiding principles

IEEE Std. 951-1988

Guide to the Assembly and Erection of Metal Transmission Structures.

3. Foundations

Page 9

BS 8004:1986

Code of practice for foundations

BS 8081-1989

Ground anchorage

BS 8110-P1-1997

Code of practice for design and construction

DIN 1045

Concrete, reinforced and prestressed concrete structures

DIN 4014

Bored piles, construction procedure, design and bearing behavior

IEC 1277

Full scale test on foundations

IEC 61773/1996

Overhead lines - Testing of foundations for structures

IEEE Std. 977-1991

Guide to installation of Foundations for Transmission Line Structures.


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4. Phase Conductors & ACS Shieldwire

ASTM A 123-89a

Standard Specifications for Zinc (Hot- Dip Galvanized) Coatings on Iron and Steel Products.

ASTM 399-82

Concentric lay stranded aluminium alloy 6201-T81

ASTM 399-90

Standard specification for aluminium alloy 6201-T81 wire for electrical purposes

ASTM B415:1992

Standard Specification for Hard-Drawn Aluminum-Clad Steel Wire

ASTM B416:1988

Specification for Concentric-Lay-Stranded Aluminum Clad-Steel Conductors

BS 443:1982(1990)

Specification for testing zinc coatings on steel wire and for quality requirements

BS 1490:1988

Specification for aluminium and aluminium alloy ingots and castings for general engineering purposes

BS 3242-1970

Specification for Aluminium Alloy stranded Conductor for Overhead Power Transmission.

BS EN 50182:2001

Conductors for overhead lines - Round wire concentric lay stranded conductors.

CIGRE - Electra No. 75 Permanent Elongation of Conductors - Predictor Equation and Evaluation Methods DIN 46391

Delivery Drums for Conductors

IEC 60104

Aluminium-magnesium-silicon alloy wire for OHTL

IEC 60888

Zinc-coated steel wires for stranded conductors

IEC 61089:1997

Amdt.1 1997 Round wire concentric lay overhead electrical stranded conductors

IEC 61089:1991

Round wire Concentric Lay Overhead Electrical Stranded Conductors.

IEC 61232:1993

Aluminum Clad-Steel Wire for Electrical Purposes

IEEE 738

IEEE Standard for the calculation of Current Temperature Relationship of Bare Overhead Conductors.

5. Optical Fibre Ground Wire (OPGW)

Page 10

BS EN 187000-1994

Generic specification for optical fibre cables

BS EN 188000-1994

Generic specification for optical fibre cables

EIA 492A

Generic Specification for Optical Waveguide Fibers

EIA 472A

Sectional Specification for Fiber Optic Communication Cables for Outside Aerial Use

EIA/TIA-455

Standard Test Procedures for Fiber Optic Fibers, Cables, Transducers, Sensors, Connecting and Terminating Devices and other Fiber Optic Components

IEC 60304

Colour coding of fibers

IEC 60793

Optical Fibers

IEC 60794

Optical Fiber Cables. Generic and production specifications.


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IEEE 1138

Standard Construction of Composite Fiber Optic Overhead Ground Wire (OPGW) for use on Electric Utility Power Lines

IEEE:P1138

Specification for optical fibre ground wire (OPGW)

ITU-T G.650

Definition and test methods for the relative parameters of single mode fibers

ITU-T G.652

Characteristics of a Single-Mode Optical Fiber Cable

ITU-T G.655

Characteristics of Non-Zero Dispersion-Shifted Single-Mode Optical Fibers

6. Insulator Strings & Conductor Fittings

ANSI C29.11

Composite Suspension Insulators for Overhead Transmission Lines Tests

ASTM 153/153M-95

Standard Specification for Zinc (Hot- Dip Galvanized) on Iron and Steel Hardware.

ASTM A 563

Nuts for Bolted Connections

BS 3100:1991

Specification for steel castings for general engineering purposes

BS 3288 Part 1:1997

Insulator and conductor fittings for Overhead Power Lines. Performance and general requirements

BS 3288 Part 2:1990

Specification for a range of fittings.

BS 3288 Part 3:1989

Dimensions of ball and socket couplings of string insulator units.

BS 3288 Part 4:1989

Locking devices for ball and socking couplings of string insulator units: dimensions and tests.

BS EN 60383-2:1995

Insulator strings & insulator sets for a.c. systems. Definitions, test method and acceptance criteria

CISPR 18-2:1986: Part 2 Radio interference characteristics of overhead power lines and highvoltage equipment. Methods of measurement and procedure for determining limits.

Page 11

DIN/VDE 0212

Fittings for overhead lines and switchgear, Part 50 to 53

DIN 48006

Insulators of overhead lines: long rod insulators

DIN 48062-2

Overhead Lines, clevis caps for insulators

DIN 48069-1

Double eyes; without protective fitting attachment; for overhead power lines

DIN 48069-2

Double eyes; with protective fitting attachment; for overhead power lines

DIN 48070-1

Triangular yokes for overhead power lines

DIN 48073

Clevis-tongue couplings – Safety devices

DIN 48074

Eyes and clevises; connecting dimensions

DIN 48075

Parallel groove clamps for aluminium stranded conductors and for aluminium conductors steel-reinforced for overhead power lines

DIN 48078-1

Clevis straps for overhead lines; for coupling to connecting bolts on the strap side

DIN 48215

Clamps and Connectors for Overhead Power Lines

DIN 48334

Turnbuckles for overhead power lines

IEC 60060-1

High voltage test techniques


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IEC 60120

Dimension of Ball and Socket couplings of String Insulator Units.

IEC 60383

Insulators for overhead lines with nominal voltage above 1000 V

IEC 60433:1998

Characteristics of String Insulator Units of the Long Rod type.

IEC 60437:1997

Radio interference test on high voltage insulators

IEC 60471:1977

Dimensions of clevis and tongue coupling of string insulator units

IEC 60507:1991

Artificial pollution tests on high-voltage insulators to be used on a.c. systems

IEC 60587:1984

Test method for evaluating resistance to tracking and erosion of electrical insulating materials under severe ambient conditions

IEC 60707:1999

Method of test for the determination of the flammability of solid electrical insulating materials when exposed to an igniting source

IEC 60815:1986

Guide for selection of Insulators in respect of Polluted Conditions.

IEC 61109:1992

Composite Insulators for a.c. Overhead Lines with a nominal voltage greater than 1000 V – Definitions, test methods and acceptable tests. (& Amendment 1)

IEC 61854

Requirements and Tests for Spacers

IEC 61284

Overhead lines, Requirements and tests for fittings

IEC 61466

Composite string insulator units for overhead lines with a nominal voltage greater than 1000 V, parts 1 and 2

IEEE 4

Standard Techniques for High Voltage Testing

IEEE Report PAS-85

Standardisation of conductor vibration measurements

IEEE:PAS-85:l966

Vibration intensity of conductors.

ISO 1460:1992

Metallic coatings – Hot dip galvanised coatings on ferrous materials – Gravimetric

ISO 1461:1973

Metallic coatings – Hot dip galvanized coatings on fabricated ferrous products – Requirements

7. Earthing

1.3

BS 7430-1998

Code of Practice for Earthing.

BS EN 1654:1998

Copper and copper alloys. Strip for springs and connectors

DIN/VDE 0141

VDE-specification for earthing in installations of rated voltages above 1 kV a.c.

DIN 48088

Earth Clamping Bolts

IEEE 1048

IEEE Guide for Protective Grounding of Power Lines.

IEEE Std. 5241-1993

Guide to Grounding During the Installation of Overhead Transmission Line Conductors

COMPLIANCE WITH STANDARDS All requirements of this Specification shall apply except where equipment Manufacturer's standards are more stringent, then the latter shall apply. For any deviations from this Specification, the Contractor shall obtain the written agreement of PDO prior to execution of the related engineering work.

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In all cases the Company shall determine the adequacy of design carried out and Works executed by the Contractor in accordance with this Specification.

1.4

ENGINEERING DOCUMENTS TO BE SUBMITTED FOR APPROVAL 1.

Line route drawing and maps

2.

Structure schedule

3.

Method statement for soil investigations

4.

Method statement for erection of the wooden pole structures foundations

5.

Method statement for erection of the wooden poles structures

6.

Method statement for erection of the lattice steel towers foundations

7.

Method statement for erection of the lattice steel towers

8.

Method statement for stringing of phase conductors

9.

Method statement for painting of lattice steel towers

10. Method statement for installation of OPGW and/or Fiber Optic Cables (ADSS) and splicing in joint boxes 11. Method statement for galvanization reparations 12. Method statement for protection of the foundations (including protective painting, gabions protection etc.) 13. Method statement for tests on piles/foundations 14. Installation criteria for structures foundations (including tower diagonal profiles, tower platforms, foundation/chimney extensions etc.) 15. Site test programs 16. Site test details and site test procedures 17. Final route records for overhead transmission line 18. Final result of earthing measurement 19. Site check lists and test reports 20. Project completion report.

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2.

Scope

2.1

GENERAL


This standard defines the requirements for the installation of overhead transmission lines with wood pole supports as well as the lattice steel towers as applied to PDO installations. The following sections define in brief the basic requirements.

2.1.1

Acc ess to Site The Company shall provide facilities for: •

•

•

Such right of access along the route of the line as the Company agrees is necessary to enable the Contractor to proceed with erection. The right to construct and make use of a reasonable width of access road along the route for the transport of materials and installation works, except at places where the Company considers that construction of access roads are not practically feasible. The right to transport material from adjacent road on to each continuous length of the route at agreed points of access.

After obtaining preliminary approval of the Company, the Contractor shall at an early stage of the Contract prepare access road drawings/maps indicating the access roads both along the line route and from the existing roads. The Contractor shall obtain route approvals from all the concerned local authorities (where required) and from the Company. Once the Company approves the access roads, the Contractor shall not use any other access without the specific approval of the Company. The access roads shall be suitable for patrol and maintenance to all parts of the finished line except in the areas where the Company considers provision of access roads are not practical. The Contractor shall regularly liase with the Company Public Relations Department at all times throughout the construction to ensure minimal disruption of the local population.

2.2

SITE PRELIMINARIES AND PREPARATORY WORKS

2.2.1

Soil Investi gatio ns The Contractor shall be responsible for conducting his own soil investigations, to the satisfaction of the Company, to determine the nature of ground conditions for the design of foundations (refer to ERD-11-02.). The Contractor shall also carry out obtain soil resistivity data during the soil investigations to determine the type and extent of earthing required at to determine the support-footing resistance and the requirement of counterpoise earthing.

2.2.2

Lin e Route Survey

2.2.2.1 Centre Line Survey Centre line survey is a preliminary survey which fixes the proposed line route, angle and terminal points. Normally the Company carries out preliminary survey and issues preliminary line route drawings with the tender. The Contractor shall check the line route with reference to preliminary route drawings and shall follow the route shown in the drawings. If a change in route is required for any practical reason, approval should be obtained from the Company. Page 14


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2.2.2.2 Detail Survey, line profiles and structure spotting The Contractor shall carryout a detailed precision survey for plotting ground and line profiles. While carrying out this work the following points shall be adhered to: •

•

•

•

•

•

•

•

The survey shall be carried out using instruments with accuracy within the permissible limits. Theodolite may be used for carrying out the survey although Total Station is preferred. The distance shall be accurately measured either by using tape/chain or tacheometry or by triangulation method depending on the territory. Electronic distance measurement (EDM) is preferred. The ground profile shall be plotted on a 1: 2000 m scale (horizontal) and the line profile on a 1: 200 m scale (vertical). . All angle and terminal points shall be fixed and their UTM coordinates shown on the drawings. Bench marks shall be fixed along the line route based on the datum approved by the Company. Levels shall be taken at every 20 m along the line route and at each structure location, obstructions, cuttings and shallow portions. In addition, levels shall be taken for any sudden change in slopes more than 30 cm in height. Where the line passes through slopes across the line, levels shall be taken on the transverse sides at an off-set distance of 20 m, in addition to the centre line, to confirm that the ground clearance for the end conductors are within the specified limits. The offset levels shall be indicated on the profile and parallel lines drawn on either side of the centre line indicating the beginning and end of such terrain. Ground levels shall also be taken at the point of road, track, wadi, pipe line and overhead line crossing the proposed line. All details upto 50 m on either side of the line shall be indicated on the ground profile drawing. These include any trees, obstructions, structures, sand dunes, mounds and ditches. The location and width of roads, tracks, wadis, overhead lines, underground pipes/cables crossing the proposed overhead lines together with the angle of crossing shall be clearly indicated in the profile drawings. It is necessary to note the following details in the profile drawings for any overhead line crossing the proposed line: - The height of the top most and bottom-most overhead line conductor crossing the proposed line route, at the point of crossing and at the point of supports. This information is required to determine the type (either above the existing line or below that or by underground cable) of proposed line crossing. The temperature at the time of measurement of conductor heights at the point of crossing shall be noted. - The voltage rating and type of construction. - Distance from the crossing point to the support structures on the existing line to be crossed. - Existing line structure identification numbers on either side of proposed line crossing.

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Page 15

The profile drawings shall indicate the visual nature of the ground, the line is traversing, such as clay, sand, rock, marsh, water logged, soft ground, cultivated land, wadi bed, normal ground etc. and their boundaries, along the line route, shall be clearly indicated. The survey data shall be plotted on to a drawing sheet with the Company standard details and title blocks, to give ground and line profiles. The drawing material shall be A1 size polyester reproducible with printed grid lines of increasing thickness in 1, 5, 10 and 50 mm squares and drawn on the reverse side of the material. Individual profile sheets shall not exceed the size of A1 drawing sheet length-wise. Profiles generated by approved overhead line software packages are preferred. The line profile (vertical) shall be plotted in accordance with the design parameters obtained from the Company SPs for the design of 33 and 132 kV overhead lines respectively. While drawing the profile, a sinkage of 300 mm shall be considered for the structures. SP-1101: Specification for Installation of Overhead Transmission

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Petroleum Development Oman LLC •

•

•


The line profile drawings shall contain proposed location and type of each support, values of wind, weight and equivalent spans, and section lengths. Sag template based on the design data shall be prepared and used to draw profile curves for the bottom most conductor. Two curves shall be drawn, one curve based on the specified maximum temperature of the conductor (hot curve) and other curve based on the minimum ground clearance (clearance curve) and location of each structure spotted on the drawings. Perspex templates shall be prepared by the Contractor to check the hot curve and the ground clearance curves. After the approval of the profile drawings, the Contractor shall spot the structures in the field and shall peg the location of each structure as indicated below.

2.2.2.3 Clearances The Contractor shall ensure that clearances are maintained from the live line to any part of the line or surroundings as per the following SP’s. •

SP-1102

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Specification for Design of 33kV Overhead Power Lines

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SP-1114A

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Specification for Design of 132 kV Overhead Power Lines on Wooden Poles

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SP-1114B

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Specification of Design of 132 & 220kV Overhead Power Lines on Steel Towers

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ERD-09-03

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Layout and spacing of Plant, Equipment and Facilities

All graded roads, including well access roads, shall be taken as public roads within the terms of ERD-09-03. The Contractor shall ensure that clearance to the existing and future pipeline and wells shall be allowed for as per the requirement of the Company. Pipeline clearance distance shall be measured from the edge of the pipeline.

2.2.2.4 Structure schedule The Contractor shall prepare a Structure Schedule consisting of structure number, type, height, span, section length, horizontal deflection (angle of deviation), type of foundation and number of stay wires. The schedule shall also contain special remarks such as whether ground has to be filled or levelled or platform or any foundation protection required. This schedule shall be submitted together with the profile drawings for the review of the Company.

2.2.3

Rout e Clearanc e

2.2.3.1 Vegetation The following requirements shall be considered while clearing the ground: •

•

•

2.2.4

Trees and tall shrub shall be cleared to a distance of 15 m on either side of the centre-line of the route. Trees and bushes shall be cut down to a height of not more than 1.25 m above ground level, after prior approval of the Company. Whenever possible, felling of trees shall be avoided and should be executed only with the express permission of the Company. Felled trees and shrub together with the roots shall be removed from underneath the proposed overhead line and also on the access road running along the line route and access roads from existing roads to the line route. The access road shall be graded road suitable for traversing by a 4-wheel drive vehicle for line patrol and maintenance by the Company.

Peggin g Out The location of each structure shall be pegged out on site.

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For angle and terminal locations, the peg shall consist of a steel angle stake painted with bands of red and white to avoid corrosion and for easy identification. Each peg shall be stencilled with the UTM co-ordinates, angle of deviation and structure number. For intermediate structure locations, either wooden or steel stakes can be used. These stakes shall be painted with bands of red and white paint and structure number shall be stencilled on the stake. All stakes shall be provided with a triangular red and white flag as a mark of caution. The pegs shall have a pointed edge on one side, which should be driven into the ground for at least 0.5 m to keep them firm and steady. Pegs shall be installed to mark the centre of the structure. Pegs shall also be installed in transverse direction for angle structure locations if required by the Company. After pegging all structure locations, before commencing construction, the Contractor shall give seven days notice to the Company for inspection of all structure locations/peg points. If required by the Company any or all locations shall be resurveyed and repegged. If structures are located in poor ground or if there ar e any obstructions the Contractor may relocate the structure subject to the satisfaction and agreement of the Company.

2.2.5

Crossings

2.2.5.1 Road and Service Crossings When the Contractor is ready to commence stringing of conductors along or across power lines, roads, or the like, he shall give a minimum 7 days notice to the Company for approval of the date and time at which he proposes to execute the Work. The Contractor shall provide diversions to the existing roads where it is necessary to avoid interference with the traffic as required by the Company or local authorities. Where the Company or any authority requires it, the Contractor shall schedule the erection and stringing work at any timings of day or night as per the convenience of the Company or authorities. The Contractor shall ensure that sufficient resources are provided to complete the work during the allocated period. During any such works the Contractor shall provide appropriate warning notices, flashing lights, flag-men etc. as required by the Company or the local authorities, to ensure the safety of the public.

2.2.5.2 Other Crossings The Contractor shall at his own expense make the necessary arrangements and take any necessary precautions where the line route traverses ground over which erection cannot be executed in the normal manner.

2.3

LINE ERECTION Before commencement of the Works, the Contractor shall submit a written Work Method Statement covering all aspects of the overhead line erection work as indicated in this document. The Company shall have the right to require alterations to the proposed working method to ensure safe practice and high quality of the finished line.

2.3.1

Safety The Contractor shall obey the entire content of SP-1104 ‘Electrical Safety Rules'. Once conductor stringing has been completed, temporary earths shall be applied to the line at the place of work (Worksite) before performing any further high level Works.

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Petroleum Development Oman LLC 2.3.2.


Erection of Wooden Poles Lines

2.3.2.1 Handling, Transportation and Storage of Wooden Poles Wood poles shall be handled and transported in such a way that there is no damage caused to the poles and safety to all concerned is ensured. While transporting the poles by road, trailers of sufficient length shall be used. If there is an overhang due to the length of trailer being shorter than the poles, permission should be obtained fr om the police and local authorities and transported in a manner approved by the Company, police and the local authorities. The Contractor shall submit a Method Statement for handling, transportation and storage of poles and obtain approval from the Company. The poles shall be unloaded carefully on the designated dumps along the line route. The poles shall be lifted in suitable bundles with the help of a crane and lowered on to the ground. Canvas slings shall be used for this purpose and use of steel rope slings is not permitted. Alternatively the Contractor may also use a skid board and lower the poles by means of rope and pulley with the approval of the Company. On no account the poles shall be dropped from the trailer on to the ground. Transportation of poles from pole dumps to the actual site locations shall be either by a crane mounted truck or a pole cart. On no account the poles shall be dragged on the butt. Wooden sleepers shall be used to stack the wood poles in the pole dumps. They shall not be stored on the ground directly. After transporting the poles to the individual locations they shall not be stored directly on the ground for a long time. All other materials including conductor drums shall be transported to the store yard, designated by the Company, and stored neatly and safely in such a manner so as to prevent any damage and provide easy identification.

2.3.2.2 Erection of Wooden Poles 2.3.2.2.1

Preparation

All operations at the Worksite shall be conducted so as not to obstruct the operations of the Company, or any other Contractor, or the operation of existing transmission or distribution systems. The Contractor must provide and maintain in good working condition all cranes, hoists, jacks, winches and tools including compression tools and dies, as may be required for the installation and erection of whole of the Works. The Contractor shall also provide workshops equipped with a reasonable range of metal and woodworking tools and assembly equipment. The Contractor shall provide suitable drilling rigs for drilling pole and stay holes in the ground to the required depth and diameter. Drilling rig shall also be used to drill bore holes for placing earthing rods. All drilling activities including the drilling rigs are subject to the approval of the Company and the holes shall be drilled in the ground as per the relevant specifications and drawings. The Contractor shall provide sufficient number of drilling rigs to complete the Works within the time schedule with adequate allowance for breakdown and repair time. Suitable bucket truck and/or ladders shall be used whenever necessary during erection, in accordance with the Work Method Statement, but such ladders shall be removed when erection work is not in progress. The Contractor shall make all necessary arrangements and take all necessary precautions where the route crosses installations, power lines or other obstacles, or ground over which erection cannot be executed in the normal manner,

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Petroleum Development Oman LLC 2.3.2.2.2


Sub-assemblies

Prior to erection of any structure, some sub-assembly of various components may be allowed by the Company as long as it is apparent that subsequent lifting of the structures as a part-assembly will not lead to overloading of any components of the structure or the lifting devices.

2.3.2.2.3

Structure erection and alignment

Where structure members arrive on site with slight distortions due to handling in transit they shall be straightened by the Contractor using an approved means, and offered to the Company for inspection and acceptance or rejection before erection commences. The Contractor shall provide and use approved tools of the correct size and they must be in good condition. The Company shall have the right to require removal from the site of any substandard or inadequate tools. The Contractor shall make due allowance for any minor pole modifications that may prove necessary (e.g., scarfing, drilling, creosoting, etc.). All modified poles shall be treated with creosote on exposed surfaces. Unused holes shall be plugged-with creosote impregnated wooden plugs. Poles shall be erected upright to within 1:250 and in line. This requirement shall be checked under full line tension conditions. Throughout the course of erection the Contractor shall take proper precautions to ensure that no parts of the supports are strained or damaged in any way. All bolts and nuts shall be tightened and lock nuts/washers fitted as specified. Bolts shall not have more than three threads protruding beyond the nut. Bolt holes in the poles shall be just sufficient to fit the required bolt diameters. All bolts, nuts, washers and other fastenings shall be as specified in the Company Standard Drawings (Bill of Material), and no element of the fastenings shall be omitted or substituted by another type. The Contractor shall ensure that a rigid bolt checking programme is conducted for all poles. On completion of initial assembly of a pole, an organised bolt-checking team shall check all bolts for tightness from the pole top downwards. After each bolt tightness-is checked the bolt shall be painted with a distinctive colour on the outer face of each side. After erection all supports shall be cleaned of all foreign matter or surplus paint. All bracing on all sides of each pole and foundations shall be completed before temporary stays are removed.

2.3.2.2.4

Wooden Poles Foundations

Basic foundation details are shown in the Company Standard Drawings for 132 kV and 33 kV overhead lines. Depth of planting of poles shall comply exactly with the design requirements. The Contractor shall establish the correct foundation type to be installed by means of soil tests and, if necessary, pole/stay anchor tests, subject to the approval of the Company. (Refer to ERD11-02.) After erection of structures and foundations, the Contractor shall consolidate the area around pole in such a way that there will be no ponding of water around the structure.

2.3.2.2.4.1

Concrete for Wooden Poles Foundations

Concrete in foundations shall consist of cement, (minimum 370 kg/m3), sand and gravel or broken stone in proportions to produce a dense concrete. Gravel, stone and sand shall be clean and free from dust, earth or organic matter, or salt. All gravel and broken stone are to be 20 mm down graded. All sand is to be coarse, sharp, clean and free from dust, salt, clay vegetable matter or other impurity and to be screened through a mesh not more than 5 mm. It is to be a well graded mixture of coarse and fine grains from 5 mm gauge downwards. Page 19


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Water shall be clean and free from all earth, vegetable matter and alkaline substances either in solution or in suspension. The maximum water to cement ratio shall be 0.55. Cement shall be Portland or other approved composition obtained from an approved maker. Portland cement shall conform in all respects to BS 12. Sulphate resisting cement (SRC) shall be used where sulphates are present in the soil and ordinary Portland cement (OPC) shall be used where sulphates and chlorides occur together. Concrete shall be thoroughly compacted during the placement. The upper surface of the concrete for all types of foundations shall be finished smooth and sloped in an approved manner to prevent accumulation of water. An approved concrete additive may be used. Concrete shall not be directly poured from a height more than 1.5 metres to avoid mix segregation. Concrete cubes shall be taken and tested to verify the concrete strength. The characteristic cube strength shall not be less than 20 N/mm 2. Concrete shall be covered by wet hessian sacks, which should be kept continuously moist during the period of curing to avoid rapid drying.

2.3.2.2.4.2

Tolerances for Wooden Poles Foundations

The centre peg of a foundation shall not depart from the longitudinal position shown on the approved profile by more than 300 mm. The centre peg shall not depart from the central axis of a section by more than 25 mm.

2.3.2.2.5

Stays

The angle to which stay wires are set and the depth to which stay-anchors are installed shall comply exactly with the Company Standard Drawings. The Company shall be entitled to require the Contractor to demonstrate that any stay-anchor is secure within its design loading. If failure occurs during such a test as a result of poor installation practice, the stay-anchor shall be reinstalled to the satisfaction of the Company, and the reinstallation of the stay-anchor shall be undertaken entirely at the Contractor’s own cost.

2.3.2.3 Earthing and Bonding of Poles All pole top metalwork shall be bonded together as shown on the Company Standard Drawings. All stay-wires shall be bonded to steel structures using the preformed bonding wires. Surge diverters at terminal structures shall be connected to earth at the base of each pole, using at least 70 mm Yellow/Green PVC sheathed stranded copper conductor. Each earth rod shall be set in a 75 mm diameter drilled hole, back-filled with bentonite slurry and finished with an earth pit and cover. The resistance to earth of an earth nest shall not exceed 4 ohms. The normal depth of an earth bore hole shall be 4.8 m (4 lengths of earth electrodes coupled together with a suitable coupling). A nest shall consist of 1 or more electrodes. The length and the quantity of electrodes shall be sufficient to achieve the specified earth r esistance. The earth wire shall be stapled to the wood pole at 1 metre intervals, care being taken to keep the wire tight and straight on the pole. Where the metal parts of the structure are connected to earth, the Contractor shall ensure that sufficient quantity of earth wire is available to enable connection to the earth rod.

2.3.3

Erection of Lin es wit h Latti ce Steel Towers

2.3.3.1 Foundations for Lattice Steel Towers 2.3.3.1.1 General The foundation installation shall include site preparation, excavation, foundation placement measurements, stub angles, backfilling, foundation cap protection and clean up of the site. The Contractor shall select the suitable type of foundation to be submitted for approval based on soil investigation data as well as information concerning flooding or other considerations affecting the foundation erection and maintenance. The foundation type for each tower location shall be Page 20


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selected by the Contractor to suit the particular site condition and the list for selected types shall be submitted for approval. Where the line route is on subkha, aggressive soils, sand dune areas or wadis the piled foundations with or without permanent casings, shall be considered. The foundation types to be installed shall cover all range of ground conditions occurring along the line route; among these may be included: normal ground, soft rock, hard rock, wadis conditions, sand dunes, subkha. Where actual soil conditions encountered show that the foundation required cannot be of standard range, then a special foundation shall be installed. The type of foundation to be used at each tower position shall be the most suitable practical solution. Normal ground is considered to be composed of compact or stiff soil. Soft rock can be of a homogeneous limestone, coral nature etc., fissured, but present on more than the bottom 50% of the f oundation setting depth. Hard rock shall be hard and massive rock. Rock anchor foundation shall be installed where the hard rock occurs within 1000mm from ground surface. Wadis are watercourse beds, which can be dry for most of the year but are subject to occasional flash flooding. The structures in a wadi shall resist to water flow and shall be protected against pressure of water and debris. In sand dune areas the movement of the dunes can affect the overhead line structural integrity and electrical clearances. Subkha shall be considered the coastal flats of salty sands, but can be also of gravely, silty clay strata, of weak strength or some compact cemented layers. The water table frequently reach the ground level and above.

2.3.3.1.2 Site Preparation The Contractor shall make all measurements on site in order to establish the excavations limits or drilling positions, stub angle, template location data. All measurements shall be within the specified tolerances for steel lattice tower foundations. The centre peg shall not depart from the line axis by more than 50mm (except where approved offset is required). The centre peg of a foundation of intermediate support shall not depart from the longitudinal position by more than 500mm. The Contractor shall clear site area after installation, removing all debris or rubbish.

2.3.3.1.3 Concrete The concrete work shall comply to BS 8110:1985, BS 5328, the “CIRIA Guide to Concrete Construction in the Gulf Region, Special Publication No 31”, ERD-19-07 and with other specified Standards and Publications. A minimum cement content of 390 kg/m 3 shall be used for locations with ground water level under the bottom of the foundation. Where the concrete is placed under water, using a tremie tube, 3 a minimum cement content of 440 kg/m shall be employed. The minimum strength of the 2 concrete for bored piles shall be 40 N/mm . Blinding concrete shall be grade 20 N/mm2. The aggregates shall be from approved sources and shall comply with the requirements of BS 882:1992 and the CIRIA Guide to Concrete in the Gulf Region, Special Publication No. 31. For approval of concrete mix, the Contractor shall submit the following details: cement type, cement content, grading of aggregates, water/cement ratio. For each concrete mix, the Contractor shall provide a representative trial mix and make cubes to be tested for compressive strength at 7 and 28 days. Testing shall be in accordance to requirements of BS 1881. The proposed concrete mix shall provide necessary characteristic strength, durability, density, resistance to sulphate and chloride attack. The source of water shall be approved by PDO. The water used in foundations concrete shall be clean and shall comply with BS 3148:1980 specifications. Any additive to be used in the Page 21


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preparation of concrete shall be approved in writing by PDO. The additives shall be in accordance with the requirements of BS 5075 or similar.

2.3.3.1.4 Cement The ordinary Portland cement shall comply with BS 12:1996 or similar approved standard. If required, the Contractor shall use low alkali cement to reduce the effects from alkali-aggregate reaction or Sulphate-resisting Portland cement complying with BS 4027:1996 or similar. The Contractor shall inform the PDO of the brand name, manufacturer and source of the cement which he proposes to use. The cement delivered to the site shall have the manufacturers’ test certificates showing the compliance to approved Standards. The use of different cement from that of the trial mixes until the fur ther trial mixes have been made and tested is not permitted.

2.3.3.1.5 Reinforcing Steel The Contractor shall have the approval of PDO for the reinforcing steel to be used. Reinforcing steel shall be deformed high yield bars, and shall comply with BS 4449:l997 or similar standard. The Contractor shall provide samples and mill certificates showing the grade and quality and shall test the samples. All reinforcement shall be clean and free from dust, mill scale, loose rust, paint, oil etc. Reinforcement shall be stored on site in protected racks above ground to avoid any damage.

2.3.3.1.6 Excavation and Backfilling The Contractor shall make excavations as specified on foundation drawings. The bottom layer of about 100 mm shall be left undisturbed before the blinding concrete will be placed. If excavations are taken too deep, the excess depth is to be filled with concrete. If excavation is too wide, the Contractor shall complete by casting up the edge of the excavation. The necessary increases and modifications to reinforcing steel shall be considered for the above excess excavation. The unsuitable excavated material shall not be used for backfill (e. g. subkha, organic soils etc). A backfill with an imported, approved soil shall be used in such cases. The backfill of shall be carefully rammed, on layers not greater than 300mm, to 95% density. The backfill will be tested at least once per each leg (4 tests per location of steel lattice tower). Excavation shall be covered at all times when work is not in progress.

2.3.3.1.7 Installation of Foundations Stubs for tower foundations shall be installed by the use of approved templates. The foundation setting tolerances are: (a) The difference in elevation of foundation stubs: 5mm on tower face and 10mm between diagonally opposite legs. (b) The face dimensions (at the top of stub): 5mm from the approved tower drawings. The diagonal distance between any two stubs (at top of stubs): 10mm from dimensions specified on approved tower drawings. (c) The slope of stubs: shall not differ by more than 5mm/metre of the stub length. The production, transporting, placing, compacting, concreting in hot weather and curing of concrete, the procedures for formwork requirements, construction joints and inspection shall be in accordance with specifications of BS 8110:1997. The towers will be erected when the backfilling is complete and the concrete has at least 10 days to harden. The Contractor shall store the materials for the preparation of concrete in a manner, which prevents contamination by dust, clay, water, or any other harmful material. Bagged cement shall be protected from rain, mixing water or damp soil. Cement from accidentally damaged bags shall Page 22


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not be used. The sulphate resisting or other special cement shall be stored separate from other cement. Where aggregate are stored directly on the ground, the bottom 10 cms shall not be used. Water, which has been used for cleaning concrete mixers and handling equipment, shall be disposed of in a manner to not contaminate sources of drinking water or the land for agriculture. Concrete shall be compacted by vibrators in such a manner that the whole of the mass of concrete to be fully compacted and air bubbles are expelled. Vibrators shall penetrate the full depth of the layer to ensure that successive layers are fully vibrated. The surface of all concrete work shall be sound, solid and free from honeycombing or protuberances. Plastering of concrete faces is not allowed. The defective concrete shall be replaced to depths. The procedure of reparation shall be submitted by Contractor to approval of PDO. When the air temperature is over 35°C and rising, the Contractor shall take precautions during mixing to lower the temperature of the concrete. The maximum temperature of the concrete shall not be over 32°C. The following measures should be considered: - Use of cooled water for mixing - Spraying aggregate with cooled water, concreting in cooler part of the day, - Keeping in shade the cement, reinforcement, aggregate and formworks, - Use of insulated water tanks, mixer and transporters. - Use of admixtures to retard, The concreting shall follow the specifications from “CIRIA Guide to Concrete Construction in the Gulf Region” and ACI Standard 305R “Hot Weather Concreting”. The Ready-mixed concrete according to BS 5328 can be used with the agreement of PDO. The concrete shall be carried in continuously operating truck mixers. The concrete shall be placed within 2 hours of the introduction of cement to the aggregates, or 45 minutes after adding the water in the mixer (whichever is shorter). The cutting, bending and fixing of reinforcing steel shall be, generally in accordance with BS 4466:1989. The reinforcing shall be accurately placed and secured in position as to not move during placement of concrete. The concreting is not allowed during storms or heavy rains. Concrete shall be protected from sunshine, drying winds, rain and running water. All concrete shall be covered for at least 14 days and shall be continuously wet for the 7 days. The exposed surfaces shall be covered with a curing compound polyethylene sheet, or with an absorbent material, which can be kept damp and shall be protected from direct sunlight. After removal of formwork, the exposed surfaces must also be protected. The curing of concrete shall be for at least one week, or as long as directed by PDO, according to weather conditions.

2.3.3.1.8 Bored Piles Installation The pile shall be reinforced with at least 6 nos., 16mm diameter of deformed bars, with a sectional area not less than 0.6% of the cross sectional area of the pile and minimum 8mm diameter spiral reinforcement. The reinforcement shall be maintained in correct position during concreting. The cages shall be sufficiently rigid as to be handled without deformations. The bored piles installation shall comply to BS EN 1536:2000. Page 23


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On completion of boring, loose or disturbed soil shall be removed from the base of the pile. Lining tubes shall be provided for sufficient depth to ensure the stability of the pile excavation during boring and concreting operations. The temporary casings shall be withdrawn, during or immediately after completion of the concreting and before concrete is starting to harden. The use of conventional vibrators, for bored piles, is not permitted.

2.3.3.1.9 Protection of Foundations The Contractor shall provide anticorrosion paint treatment on tower stubs, steel piling casing and pile caps. The painting of the stubs with two layers of an epoxy type paint shall be applied on 300mm above concrete level. After concreting the foundation caps, the joint with the stub angle shall be sealed with an acrylic type seal material on 10cm thickness around the stub angle. The foundation cap shall be painted with a coal tar paint on 150mm over the concrete level and 300mm under ground level. Where instructed by PDO, the Contractor shall install gabion walls to protect tower locations against flooding waters. Gabions shall be filled in double-twisted hexagonal mesh of PVC coated galvanised steel wire of at least 2.5mm (steel) diameter. They shall be rectangular boxes of 2m long, 1m wide and 1m high with two compartments separated by a diaphragm, filled with approved broken rock of a minimum size greater than the mesh eye. Where required by PDO, the location shall be protected against erosion or floods by gatch platforms compacted to 150mm thick and extending 5m from the tower foundations. In low-lying areas and on subkha areas of the line, gatch platforms of 500mm thick minimum shall be considered upon instructions from PDO.

2.3.3.2 Erection of Lattice Steel Towers 2.3.3.2.1

General

The Contractor shall ascertain that all concrete foundations or rock anchor grouting are cured and that all back-filled material is compacted to its approved level before placing or erecting tower steel on the foundations. Concrete in tower foundations shall be allowed to set a minimum of 7 days before erection of the tower and a minimum of 28 days before conductor and earth wire installation on the tower. The Contractor shall erect the types of towers specified at the locations indicated on the Contract Drawings. Towers shall be assembled in accordance with the approved drawings and erected by a suitable method, which will not overstrain structural members or their foundations, subject to PDO’s approval.

2.3.3.2.2

Handling and Storage of Steel Towers

Steel shall be stored on wooden supports of sufficient height to avoid any ground contact or other contamination. Storage conditions shall be well ventilated, preventing the formation of wet storage stain from accumulation of humidity and sand. It shall be clearly understood, that white rust formation will lead to rejection of the affected material. All necessary measures shall be taken to prevent structural injury to members, or damage to galvanized coatings. Members shall not be dragged on the ground, nor will the practice of throwing tower steel into piles on conveyances, or from conveyances onto the ground, and of skidding steel members over each other, be permitted. Lifting of tower steel shall not be done with steel slings, being in direct contact with galvanized surfaces. Instead, fabric belts, or other suitable protection shall be applied. Tower material damaged shall be replaced by the Contractor at no cost to PDO. Page 24


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Small accidental damages to galvanized surfaces may be repaired by application of an approved repair paint. Minor damages to galvanized steel members could be repaired by application of a special paint as follows: Brush cleaning of the damaged area of any trace of dust, rust and degreasing (if necessary); Coating of the damaged area with two layers of zinc rich paint containing at least 95% Zn in the dry film. The painting shall be done according to manufacturer’s instructions. The final dry fill of paint shall be at least 150 microns. Larger damages to, or systematic defects of the galvanizing shall be repaired by hot-dip galvanizing, only. • •

The attempt to repair shall not bind PDO to accept the repaired part when this is re-offered for inspection. Acceptance by PDO of any repaired galvanized steel does not absolve the Contractor from his responsibility of supplying galvanized steel to give satisfactory service in the prevailing corrosive atmosphere. PDO reserve the right to reject any galvanized steel found rusty, damaged, bent or other-wise defective, before final acceptance.

2.3.3.2.3

Erection of Steel Towers

Prior to the commencement of any tower erection activity the Contractor shall submit for approval a Method Statement detailing the proposed erection methods and safety precautions to be taken during the erection. The Contractor shall erect towers for the transmission line in accordance with the erection diagrams, construction lists and other drawings and instructions. The method of assembling and erecting a tower shall be such that during er ection no member shall be subjected to any stress in excess of that for which it was designed. Misalignment or misfit of adjacent sections or members attributable to the adopted method of erection shall be corrected by changing erection methods as necessary to eliminate trouble. Straining of members shall not be permitted for bringing them into position. It may, however, be necessary to match hole positions at joints and to facilitate this, tommy bars not more than 450mm long may be used. For ease of checking bolts and nuts shall be generally fitted in such a way that the nuts are placed outside for horizontal bolts and downside for vertical bolts. Before starting erection of an upper section, the lower section shall be completely braced and all bolts provided tightened adequately in accordance with approved drawings to prevent any mishap during erection. All plan diagonals relevant to a section of tower shall be placed in position before assembly of upper section is taken up. All members shall have their joints cleaned when bolted up. If erected by assembling in sections, the initial tightening of bolts shall be adequate for dead load, live load and direction stresses, but shall not be so strong as to prevent aligning and fitting adjacent sections or members. The assembled sections shall be adequately supported during erection. All blank holes, if any left, after complete erection of the tower, are to be filled up by bolts and nuts of the correct size. During the erection, no tools shall be taken up to the towers, except structure wrenches and drift pins. Only such wrenches will be allowed, which do neither deform nor injure the galvanized coating of the bolts/nuts. Use of drift pins is limited to guiding the different tower members into position, without enlarging holes or distorting tower members.

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Each bolt shall be securely tightened with adequate but non-excessive torque. Proper tightness shall be spot checked by the Contractor, to PDO’s satisfaction, with an accurately calibrated torque wrench. The tightening torque to be applied on bolts is the following: − − − − − − −

6,0 daN×m for 12mm dia bolts 7,0 daN×m for 14mm dia bolts 9,7 daN×m for 16mm dia bolts 17.2 daN×m for 20mm dia bolts 20.3 daN×m for 22mm dia bolts. 22.0 daN×m for 24mm dia bolts. 25.0 daN×m for 30mm dia bolts.

All tower bolts shall be completely tightened, immediately after a tower is erected. After erection, towers shall be left in workmanlike condition, complete and safe in every respect. In order to prevent pilfering, all bolts and nuts below a minimum height of 3 m above the foundation cap shall be secured by suitable means, to be proposed by the Contractor, for PDO’s approval. During assembly punching, reaming or drilling for correction of mismatched holes shall not be permitted without the authorisation of PDO in writing. If any shop errors are discovered in the steel, the Contractor shall notify PDO who will decide on site whether the error shall be corrected on site or the members shall be replaced. All exposed steel surfaces around the holes or on cuts on which corrective work is permitted shall be given sufficient coats of an authorised zinc rich paint to provide sufficient protection to the steel and shall be to the approval of PDO. Towers must be completely erected with all members in place and bolts securely tightened before any stringing of conductors or earth wires may be started. All towers shall be inspected by PDO accompanied by the Contractor before the stringing operation. Prior to the erection of towers or parts of towers, which had completely been assembled on ground, the approval of PDO is required. In aviation-marking areas, immediately after erection above foundation level, the towers shall be illuminated, either by the permanent lighting system or by a temporary lighting system, to be approved by the Directorate of Civil Aviation.

2.3.3.2.4

Tolerances for Installation of Steel Towers

Members deformed in excess of the allowed limits shall not be erected Compression elements shall not have lateral deformation exceeding 1/600 of the member length. Tension members shall not have lateral deformation exceeding 1/300 of the member length. All towers shall be vertical after erection and shall remain substantially vertical under the stresses set up by the overhead line when complete. The self supporting tower shall not be out of plumb from transverse or longitudinal centreline by more than 1/480 of its height.

2.3.3.3 Aircraft Warning Painting 2.3.3.3.1

General

All towers shall be red and white bands painted in accordance to Annex 14, Aerodromes, Chapter 6, paragraph 6.2.5 of the International Standards and Recommended Practices issued by the International Civil Aviation Organization, and is subject to the PDO's approval. This specification is to define surface preparation, protective coatings and paint systems to be applied on equipment and structures unless otherwise specified. The general guides for the work shall be: (a) Page 26

this Specification SP-1101: Specification for Installation of Overhead Transmission

Printed 26/06/08




(b) British Standard Code of Practice CP.2008; 1966, B.S.: 4232, 2015, 729, 3083, 381 C, 4479, 4360, 3294 and 4604 (c)

Swedish Standard SIS 05 59 00 - 1967 or equivalent standard

(d)

German Standards DIN 55 928 and DIN 4115 or equivalent standards

(e)

the paint manufacturer’s Technical Data Sheet and Instructions.

2.3.3.3.2

Surface Preparation

Prior to chemical treatment / surface preparation, the galvanised surfaces shall be carefully cleaned by brushing with fresh water to remove all foreign substances such as salt, white rust and zinc corrosion products, dust sand and dirt. If the galvanised steel surfaces shall be chemically treated it has to be subject to the approval of the PDO. Prior to painting, the galvanised surfaces shall be carefully checked for damages, defects and impurities. In case of persistent white rust and corrosion products it is necessary to remove these by sweep-blasting or mechanical brushes . However, tarnishing of surfaces must be avoided. In specific cases where damages are severe, re-galvanising shall be required. Such prepared surfaces must be approved by the PDO prior to paint application.

2.3.3.3.3

Preparation of coating materials

Primers and paints which have liveried, gelled or are otherwise deteriorated shall not be used. All ingredients in any container shall be thoroughly mixed before use and shall be agitated frequently during application to keep the primer in suspension. Primer or paint mixed in the original container shall not be transferred until all settled pigment is incorporated into the body of liquid. Primer or paint shall be mixed in a manner ensuring the breakdown of all lumps, complete dispersion of pigment and uniform composition. Thinners shall not be added to primers or paints unless necessary for proper application according to the manufacturer’s instructions. The type of thinners used shall comply with the manufacturer’s ‘instructions. When use of thinners is permitted, it shall be added to the primer or paint during mixing in a good ventilated area.

2.3.3.3.4

Painting of Steel Towers

For better adhesion and corrosion protection priming coats shall be applied by brush or by airless spray only. The other coats of paint are to be applied by brush roller or spray and in accordance with the paint manufacturer’s recommendations. -

first layer of primer

-

second layer of intermediate coat

-

the final layer of red or white colour.

Type of paint to be applied on lattice steel towers and minimum thickness shall be: -

Zinc-rich primer (two pack epoxy zinc rich primer, e.g. polyamide cured) with a grey dry film minimum thickness of 40 microns.

-

Intermediate coat (two pack epoxy micaceous iron oxide, e.g. polyamide cured) with a dark grey film thickness of minimum 60 microns.

-

Final coat of aliphatic polyurethane or acrylic epoxy with a white (RAL 9010) and red (RAL 2002) dry film thickness of minimum 60 microns.

All surfaces to be painted must be moisture-free and paintings shall not take place when: -

Page 27

the surface temperature is above 50°C


Printed 26/06/08




-

the relative humidity is above 85% or the surface temperature is closer than 3°C or below the dew point

-

it is raining

-

sandstorms occur to such extent that the wet painting might be affected.

To ensure the suitability of paints the Contractor shall execute sample tests at site. Such panels must be approved and shall be used as r eference for quality control. These tests shall be carried out at a very early stage of the contract period and no paint shall be ordered beforehand. Final selection of the paint is subject to the approval of PDO, depending on the results of the above mentioned site tests. All finishes shall be clean and in good sound conditions. Each coat shall completely and uniformly cover the coat underneath it. There must be no delay between application of successive coats but each coat must by thoroughly dry or as directed in the paint instructions before next coat is applied. Before additional coats are applied to painted surfaces, the existing paint shall be cleaned of all foreign matters and suitably sanded if necessary. Excessive coat thickness shall not exceed the maximum specified by the paint manufacturer.

2.3.3.3.5

Responsibilities and Guarantees

Inspection of coatings by PDO shall neither relieve the paint manufacturer from his responsibility of providing good quality products nor the Contractor from his responsibility of acquiring the specified quality of material or the correct performance of the work. This is also applicable to shop-primed structural steel or other components. The Contractor shall bear the full responsibility for galvanizing and paint applied by him or by others. The complete painting system is guaranteed for a period of not less than 5 years after the Final Acceptance Certificate. The Contractor shall provide a Guarantee Performance Bond to assure the performance of extended guarantee obligations for PDO painting system. The Contractor shall carry out during the extended guarantee period any repair or replacement on the painting system executed under this specification at no additional cost after being intimated by PDO. If the repairs are not carried out to the satisfaction of PDO, these repairs shall be performed by others, who will be assigned by PDO, and the costs thereof shall be borne by activating the Performance Bond valid for the extended guarantee obligations.

2.3.4

Conductor Stringing

2.3.4.1 Preparation Before commencement of stringing, tower footing resistance tests shall be made at each tower and necessary earthing devices shall be installed and tested. Conductor and earthwire erection shall be carried out entirely by approved tension stringing methods, keeping conductor off the ground al all times when the conductor is in motion. Tenderers shall include with their Tenders details of the precise method of tension stringing they propose to use, together with details of their proposed stringing equipment. At least 3 months before stringing commences the Contractor shall submit to the Engineer for approval a fully detailed, comprehensive work proposal which shall include, but not limited to, the following:

Page 28

-

Work sequence and methodology including creep compensation regime;

-

Locations of conductor drums and winch location;. SP-1101: Specification for Installation of Overhead Transmission

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Petroleum Development Oman LLC -

Temporary stay arrangements and temporary support strengthening;

-

Scaffold positions and types;

-

Positions of mid-span (tension) joints;

-

Procedures and method for making joints and dead end clamps;

-

Schedule of conductor accessories to be fitted;

-

Erection (initial) sags and tensions.


Particular attention shall be given in this work proposal to the procedure for stringing the OPGW where special care is required to guard against damage to the optical fibre cable. The supplier of the OPGW will be responsible for the supervision of installation by the Contractor, to ensure that the overall system reliability requirements met. To ensure that this is undertaken, the supplier will provide the services of a suitable qualified/experienced installation supervisor, who shall supervise the installation of the works throughout and shall advise PDO and the Contractor in matters of methods procedures and precautions to be followed and will be responsible for all matters pertaining to the quality of the installation. The Contractor shall provide PDO with a method statement giving sequential details of the stripping procedure and the optical fibre jointing (splicing) procedures. The method statements shall take full cognizance of the manufacturer's installation instructions. The method statements shall be submitted to PDO for acceptance the requisite period prior to stringing or optical fibre jointing commences. The Contractor shall ensure that the fibre optic cables are not strained or damaged either mechanically or optically during stringing and/or jointing. The Contractor shall demonstrate the suitability of his proposed method, including the choice of running blocks and stringing equipment, bull wheel diameters, fibre optic cable wrapping equipment and methods etc., prior to the commencement of stringing operations. Optical fibre joints either in the OPGW or between the OPGW and the non-metallic underground fibre optic cable shall be housed in optical joint boxes. The joint boxes shall be located immediately above the anti-climbing device for convenient access by technical personnel. All joint boxes shall be earthed to the support steelwork using approved multi-wire/multi-strand flexible aluminium earthing bonds or copper earth fitted with bi-metallic lugs.

2.3.4.2 Equipment and Tools Conductors, joints, and clamps shall be erected using approved tools and in such a manner that no birdcaging and over-tensioning of individual wires or layers or other deformation or damage to the conductors occurs. Clamps or hauling devices used in erection shall be of approved design and shall not allow any relative movement of strands or layers of the conductors. The Contractor shall supply all the necessary drum-stands, drum-spindles, drum-brakes and jacks to ensure efficient paying-out of conductors. All winches, anchor sheaves and running lines shall be supplied by the Contractor and maintained in good order to the approval of the Company. Connection of the steel running line (pilot wire) to the conductor shall be to the approval of the Company and shall be of a type capable of passing through the slinging snatch. Snatch blocks for slinging conductors shall be of an approved type and shall be robust. The conductor pulley shall be fabricated from aluminium or similar material. The Contractor shall provide sufficient snatch blocks to satisfactorily achieve the stringing of the longest continuous line section. Tensioning bull wheels shall have a minimum diameter of 35 times the outside diameter of the largest conductor required under the Contract or as necessary to suit the requirements of the OPGW, and will have multiple grooves lined with neoprene such that conductors smaller than the Page 29


Printed 26/06/08




groove or as required diameter will seat into the lining without being flattened. Brakes and controls shall be hydraulically operated to minimise danger of brake failure. The tensioner design shall be such that once the required tension is obtained, the conductor will remain at that tension so long as the brake setting remains unchanged. Conductor running out blocks shall be so designed as to allow conductors to be pulled out smoothly and shall have a minimum diameter of 600mm at the bottom of the conductor groove. Blocks will be of low friction design and the block groove shall be lined with neoprene. Blocks are to be designed so that the pilot wire does not damage the neoprene lining during conductor running. Running out blocks which do not run freely or operate properly shall be removed from site for repair and must receive the Engineer's approval before they may be re-used. The blocks shall have an electrical conducting path between their suspension fittings and the conductors supported by the blocks.

2.3.4.3 Drum Lengths and Joints The Contractor must note that the Company's policy is not to permit the use of midspan joints. The Contractor shall make use of maximum conductor lengths in order to avoid midspan joints and to reduce the wastage to a minimum. A Drum Schedule shall be prepared by the Contractor and approved by the Company prior to stringing. If mid-span joints are finally approved, the number and location of such joints should be submitted to the Company for approval. These joints shall be not less than 25 m from the nearest conductor clamp, and joints between different phase wires in the same span should be adequately staggered to the satisfaction of the Company. Mid-Span joints shall not be used: •

With less than 2 complete spans between joints.

•

In single spans or within 2 spans of a section pole.

•

In spans crossing power lines, roads, etc.

Conductor repair sleeves shall not be used without the permission of the Company. Only compression connections shall be used and comprise exclusively the type specified in the material lists, unless otherwise directed by the Company. Bimetallic compression connections, as specified in the Company Standard Drawings and Schedule of Overhead Line Materials, shall be employed where equipment with copper terminals are to be connected to line conductors. The Contractor shall test each joint, etc., in accordance with Section 2.6. Test results, together with the location of each fitting, date of assembly and name of the linesman responsible for the assembly, shall be recorded on functional test sheet (see Section 2.6). This record shall be handed over to the Company on completion of each section of line. The Contractor shall obtain approval from the Company for the Linesmen employed to make compression joints. The Contractor shall obtain this approval through the submission of a test joint for quality control check by the Company. Where records of joints made by any particular linesman show a repeated performance below the required standard, the Contractor, at the request of the Company, shall cease to employ the linesman on Company’s installation jointing operations and shall immediately replace him with other approved personnel.

2.3.4.4 Conductor Damage Since the ground that the transmission line traverses is in many parts boulder-strewn or rocky, the Contractor shall employ an approved method of pilot wire tension stringing to keep the moving conductor off the ground during stringing operations. Alternatively, the Contractor shall provide trestles or scaffolds to ensure that the conductor does not touch the ground whilst in motion. The Contractor shall forward to the Company for approval full details of the tension-stringing method, together with details of machine and equipment he proposes to use. Page 30


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When due to a mishap a conductor makes contact with the ground, stringing work shall stop whilst the conductor is examined and offered for inspection to the Company. The Company at its discretion may order such quantity of phase conductor or earth conductor to be discarded and replaced by the Contractor at his expense. In the case of local damage to individual wires of a conductor during erection, the use of repair sleeves of a type approved by the Company may be permitted. This shall be at the discretion of the Company. Any conductor that has been run-out and not finally tensioned shall not be left overnight either on the ground or within 4.5 m above ground level. Conductors should never be on the ground.

2.3.4.5 Stringing Procedure The Contractor shall employ an approved method of tension stringing that will not cause damage to conductors or over-tension the conductors, and at all times will not allow conductors to touch ground or any obstacle. The Contractor shall submit with his tender a general description of both method and type of equipment he proposes to use. Cutting of layers of conductors shall be executed with tools designed to prevent damage to underlying strands. Cut-ends of conductors and joints, clamps and fittings attached to the conductors themselves shall be treated in a manner approved by the Company to prevent ingress of air or moisture. Conductor, joints and clamps shall be erected so that no bird-caging, over-tensioning or other deformation can occur to the individual wires or layers of the conductor. Clamps or hauling devices shall, under erection conditions, allow no relative movement of strands or layers of conductors. If required by the Company, this property shall be demonstrated by actual tests. Application of tension-clamps shall be executed at pole/tower tops by use of 'come-along' clamps of an approved design. Transfer of conductors from snatch-blocks to post-top insulators shall not be effected before completion of anchor-clamps. Each conductor shall be clamped-in at intermediate poles not later than 48 hours after being tensioned-off at section poles. Tension gauging marks on conductor shall be applied with white cotton tape which shall be removed on completion of the fitting of each tension-clamp, which shall be suitable for live-line working.

2.3.4.6 Sags and Tensions The Contractor shall prepare the sag and tension charts and calculate tension values for pretensioning which are to be used for erection of 220kV, 132 kV and 33 kV lines. The lines shall be pre-tensioned for a minimum time of 1 hour and the pretension value shall be maintained by adjustment at 15 minutes intervals during the pre-tensioning period. For determining tension to be applied to a section having a number of different spans the 'equivalent span' method shall be used. For sag measurement a span having a length close to the equivalent span length shall be chosen. The Contractor shall submit to PDO for approval the following details applicable to each conductor or earthwire type used on the contract:

Page 31

(a)

Final sag and tension charts for a range of equivalent spans applicable to the transmission line, considering the weight of spacer dampers, aircraft warning spheres etc. Final sag and tension charts for a range of spans applicable to the downleads to substations or slack span connections in the line. Sag and tension charts for downleads and slack spans shall take into account the weights of insulator sets.

(b)

The proposed regime for creep compensation including the basis for determining initial sag tension sags and tensions. SP-1101: Specification for Installation of Overhead Transmission

Printed 26/06/08


Petroleum Development Oman LLC (c)


Initial sag and tension charts, or tables, for use in the actual sagging of the line for a range of actual possible conductor temperatures.

Immediately after conductors have been erected and clamped-in, mean sag of conductors shall not depart from the correct erection sag by more than minus 5%. In addition, sag of any one line conductor shall not depart by more than 150 mm from the sag of other line conductors in the same span. Vibration dampers or spacer-dampers shall be installed immediately following the clamping in of a section. When required by the Company prior to issue of a Certificate of Acceptance, the Contractor shall be responsible for checking that relative sags of conductors and earthwires are within the specified tolerance. Such checks shall be conducted at selected points along the route, as requested by the Company. Clearances between conductors and ground and between jumpers and structures shall be checked during erection and before handing over the line. The Contractor shall provide suitable dynamometers, sighting boards and levels or other approved apparatus necessary for the proper checking of the Works. When required by the Company dynamometers shall be tested and if necessary re-calibrated at the Contractor's expense. Sag adjustment should be done through sighting boards and sighting levels and sag should be adjusted and measured at mid-span, to the s atisfaction of the Company, During progress of the Work the Contractor shall record on approved schedules (See Section 2.6) particulars of sagging of conductors on each section of the route. These schedules shall show section pole numbers, individual span lengths, equivalent span, design and erection sags, together with mean actual sag of phase conductors, as well as both temperature and dates of stringing and checking. At the end of the Contract these schedules shall be handed to the Company. Where vertical slope between supports exceeds 20% the Contractor shall make allowance for the difference in level when calculating the sag.

2.4

INSPECTION AND TESTING

2.4.1

Tests During Erectio n

2.4.1.1 Conductor Joint Tests The Contractor, in the presence of the Company, shall accurately measure contact resistance of all completed clamps, joints and terminal fittings. Where a Joint consists of several parts bolted together (e.g., dead end clamp with bolted-on jumper terminal), resistance to be measured is that of the complete assembly. Resistance of any such fittings shall not exceed 75% of the resistance of an equivalent length of conductor, measured adjacent to the fittings, and the current carrying capacity shall be at least 100% of that of the conductor. Measurements shall be recorded on Functional Test Sheet. (See Section 2.6). The Contractor shall provide suitable equipment (such as a Ductor or an APT/CERL Digital Micrometer Model DMO 310) for conducting the above tests, and shall submit details of the proposed instrument to the Company for approval. Suitable clamps also shall be supplied for connecting current leads of the measuring instrument to the test sample to provide adequate surface contact at interfaces. Test probes as used for potential contacts are unsuitable for current connections. Stringing of conductors shall not commence until the instruments are on Site and ready for use.

2.4.1.2 Cable Tests Installation of cables used for underground road crossings, etc., shall be recorded on Check Sheets (see Section 2.6). Page 32


Printed 26/06/08




Cables shall be subjected to an HV cable DC pressure test whilst disconnected from the overhead line and associated surge arresters. Results of tests shall be recorded on Functional Test Sheet FS 14.

2.4.2

Inspection

2.4.2.1 Inspection During Erection As the erection of the overhead line progresses the Contractor shall ensure that a record is kept of outstanding items of Work. Check Sheet (see Section 2.6) shall be used to note exceptions.

2.4.2.2 Final Inspection Upon notification by the Contractor that a Work section is finished as a complete line, the Company, prior to issuing the Certificate of Acceptance, shall inspect the completed Works, in order to ascertain that they have all been executed in full accordance with the Specifications and Drawings. In particular it shall be ascertained that: •

•

•

•

•

•

•

•

Back-filling of excavations, ramming and levelling around foundations and stays, disposal of excess earth from excavations, etc., are completed. Steel sections are correctly installed, straight and not damaged. Bolts and nuts are correctly fitted with washers, as equipped, and are properly tightened and painted to indicate tightness check is complete. Stays and accessories are complete and correctly fitted. Equipment, such as disconnectors and drop out fuses are fitted correctly and completely in accordance with the Company Standard Drawings and Specifications, and are operable without undue difficulties. Damage to galvanised parts has been made good to the Company's approval by the application of cold galvanising (zinc rich) paint. Insulators are clean and totally free from foreign materials and is undamaged. The Works are erected in complete accordance with the Company Drawings and Specifications.

•

Line conductors are correctly clamped and made-off.

•

Structures are free of all construction equipment, loose materials and other foreign matter.

•

Anti-climbing devices are correctly installed.

•

Conductors are clean and without any strand damage.

•

•

•

Conductors are erected in accordance with sag and tension schedule and clearances are correct. Pole identification code plates, danger signs and reflectors are fitted correctly and Identification Code Schedule (see Section 2.6) completed. All material surplus to requirements and all debris and rubbish have been removed and deposited as directed by the Company.

Check Sheet (see Section 2.6 ) shall be completed by the Company to signify to the Contractor any unsatisfactory Work or outstanding items.

2.4.3

Pre-Commis sio ning Tests Subsequent to the inspection the Contractor in the presence of the Company shall test lines for: •

•

•

Page 33

Resistance to earth of each component and each completed earth system, measured and recorded before final connection. This shall include earth resistance tests of stay-anchor arrangements. Line continuity, measured with an approved 1 kV Insulation Resistance Tester. Insulation resistance of the line to earth and between phases, measured with an approved 5 kV Insulation Resistance Tester. SP-1101: Specification for Installation of Overhead Transmission

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Petroleum Development Oman LLC •


Electrical integrity of all tension joints, measured with equipment designated in Section 2.4.1.1.

If specified in the project specifications, the Contractor shall perform line impedance tests. These shall include the measurement of:

2.5

•

Positive sequence impedance.

•

Zero sequence impedance.

MAINTENANCE The Contractor shall be responsible for making good all settlements of filled ground due to any cause, whatsoever which may occur up to the end of the period of maintenance. At the end of the maintenance period specified ground clearance plus conductor creepage allowance shall not be infringed. In addition, sag of any phase conductor shall not depart by more than 150 mm from the mean sag of all phase conductors in the same span. Tests shall be conducted at selected points along the route, as required by the Company, and the Contractor shall provide the necessary surveying instruments to enable checks to be conducted with the line live and in service. All sag and clearance corrections that may be required by the Company shall be undertaken in a prompt manner and at times specified by the Company, to minimise the service interruption of the line.

2.6

CHECK SHEETS AND SCHEDULES The following Functional Check and Test Sheets shall form part of the As-Built record of the overhead line.

2.6.1.

Overhead Lines on Wooden Poles •

Overhead Line Installation and Compression Joints.

•

OHL Erection/Sag Chart Record

The following check sheets shall be used during construction of the overhead line.

2.6.2.

•

Construction Test Sheets for OHL Installation.

•

Overhead Line Identification Code Schedule***.

Overhead Lines wit h Latti ce Steel Towers Construction Check Sheets: •

Installation of Overhead Line Foundation;

•

Erection of Overhead Line Steel Lattice Towers;

•

Painting Check Sheet;

•

Erection/Sag Chart Record;

•

Overhead Compression Joints.

Pre-Commissioning Check Sheet: •

Installation of O/H Lines on Steel Towers - Inspection

•

Installation of O/H Lines on Steel Towers - Tests.

NOTE: *** shall be used to mark-up As-Built drawings and for noting where pole identification plates are required.

Specimen copies of these check sheets and schedules are located in SP-1100 and Standard Drawings STD-4-1320-001 and 1410-001. Page 34


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Petroleum Development Oman LLC 2.7


AS-BUILT DRAWINGS As-Built drawings in accordance with ERD-00-05 shall utilise the contract drawings as the basis for recording the final status of the installation. As-Built drawings shall record all deviations, deletions and additions with respect to the original scope, such as, for example, route changes, pole locations, foundation types, stay arrangements, and all other variations.

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APPENDIX A : GLOSSARY OF DEFINITIONS, TERMS AND ABBREVIATIONS The following terms and abbreviations used in this document, are defined below:

General Terminology Shall

-

The word 'shall' is to be understood as mandatory.

Should

-

The word 'should' is to be understood as strongly recommended.

May

-

The word 'may' is to be understood as indicating a possible course of action.

The Company

-

Petroleum Development Oman L.L.C. Muscat, Sultanate of Oman.

User

-

A specified Engineer, Consultant or Contractor who applies these Standards in the execution of a PDO project.

The Company representative

-

The Consultant

-

The party to the contract with the Company who is responsible for providing the design, engineering and other related consultancy services under the contract.

The Contractor

-

The party to the Contract with the Company who is responsible for the construction and other related works specified in the contract. On occasion, for example in 'turnkey contracts' the contractor may be responsible for design, engineering, manufacture, shipment, supply, installation, testing, commissioning and performance guarantee up to the defects liability period as defined in the individual contract.

Manufacturer

-

The party responsible for the manufacture of equipment and services to perform the duties specified by the Consultant, Contractor or Company.

Vendor/Supplier

-

A party responsible for the supply of equipment, materials or productrelated services in accordance with the Purchase Order issued by PDO, its Consultant or Contractor, or its nominated Purchasing Office.

Works

-

All Works to be executed and all services to be rendered by a Contractor under the terms of a Contract.

Work-site

-

A defined place designated by the Company where all Works and services shall be executed by a Contractor under a Contract.

CFDH

-

Corporate Functional Discipline Head

OHL

-

Overhead Transmission Line

A person appointed from time to time by the Company, having the functions set forth in Article 2 of General Conditions for Construction Works, and whose authority shall be notified in writing to the Contractor by the Company.

Abbreviation

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SP USER-COMMENT FORM SP User-Comment Form

If you find something that is incorrect, ambiguous or could be better in an SP, write your comments and suggestions on this form. Send the form to the Document Control Section (DCS). They make a record of your comment and send the form to the correct CFDH. The form has spaces for your personal details. This lets DCS or the CFDH ask you about your comments and tell you about the decision. SP Details Number:

Title

Issue Date:

Page number:

Heading Number:

Figure Number:

Comments:

Suggestions:

User’s personal details

Name:

Ref. Ind:

Signature:

Date: Phone:

Document Control Section Actions

Comment Number:

CFDH

Dates

Recd:

To CFDH:

Ref. Ind:

CFDH Actions

Recd Date:

Decision: Reject: Accept, revise at next issue: Accept, issue temporary amendment

Inits:

Ref.

Date:

Ind:

Comments:

Originator Advised:

Page 37

Date:

Inits:

Document Control Section Advised:

Date:


Inits:

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CHECK SHEETS AND SCHEDULES Overhead Lines with Lattice Steel Towers

SP-1101: Specification for Installation of Overhead Transmission Lines

Printed 26/06/08


PDO

CONSTRUCTION CHECK SHEET

CW-NNN A1

CIVIL WORKS Sheet 1 of 1

INSTALLATION OF

REV 0

OVERHEAD LINE FOUNDATION PROJECT DESCRIPTION

DATES

CONTRACT No.

EXCAVATION

LOCATION No.

CONCRETING

TYPE OF FOUNDATION

BACKFILLING

REFERENCE DRAWING

Installation Records 1.

Deviation from alignment of central peg

2.

Depth of excavation

3.

Excavation dimensions (layout)

4.

Undercut (under-ream) dimensions

5.

Chimney/cap dimensions

6.

Pad/foundation base dimensions

7.

Ground water level

8.

Stub angle inclination to vertical (stub rake)

9.

Stub level (on 4 legs)

Specified

Result

10. Face dimensions between stubs 11. Diagonal dimensions between stubs 12. Twist of stub in plan 13. Concrete strength at 28 days (cube/cylinder) 14. Concrete volume 15. Reinforcement weight 16. Protection painting of chimney/cap/stub 17. Backfill compaction 18. Earthing B.

REMARKS / OBSERVATIONS (include notes on bottom heaving, alignment of excavation walls, side caving, site cleaning etc.):

CONTRACTOR SIGN & DATE

REF: SP-1100

PDO CIVIL WORKS SIGN & DATE

PDO

CW-NNN A2

CONSTRUCTION CHECK SHEET TOWERS

Sheet 1 of 1

ERECTION OF OVERHEAD LINE

REV 0

STEEL LATTICE TOWERS PROJECT DESCRIPTION

DATES

CONTRACT No.

ERECTION START

LOCATION No.

ERECTION COMPLETED

TOWER TYPE

FOUNDATION CONCRETING

REFERENCE DRAWINGS

Installation Records

Result

1. Tower verticality deviation (max 1/480) 2. Twisting at crossarm level [degree] 3. Missing tower elements: 3.1. Structural members 3.2. Bolts and nuts 3.3. Washers and fillers 4. Missing tower accessories 4.1. Anticlimbing device 4.2. Step bolts 4.3. Danger plates 4.4. Number plates 4.5. Bird guards 4.6. Circuit plates etc. 5. Tower elements with defects 5.1. Bended, members with distortion 5.2. Uncleaned members 5.3. Members with damaged galvanization 5.4. Members with white rust 5.5. Members with sectional dimensions less than required 5.6. Thickness of galvanizing less than specified 6. Bolts and nuts check 6.1. Grade of bolts 6.2. Tightening by torque wrench: 6.2.1. for 12 mm bolts (min. 6.0 daN.m) 6.2.2. for 14 mm bolts (min. 7.0 daN.m) 6.2.3. for 16 mm bolts (min. 9.7 daN.m) 6.2.4. for 20 mm bolts (min. 17.2 daN.m) 6.2.5. for 22 mm bolts (min. 20.3 daN.m) 6.2.6. for 24 mm bolts (min. 22.0 daN.m) 6.2.7. for 30 mm bolts (min. 25 daN.m) 6.3. Number of threads out of nuts (min.3) 7. Quality of painting 7.1. Stub angle painting 7.2. Tower painting B.

REMARKS / OBSERVATIONS:

CONTRACTOR

PDO CIVIL WORKS

SIGN & DATE

SIGN & DATE

REF: SP-1100

3 A 1 f

0 V E o R N 1 N t e N h e S

m m m m μ μ μ

W C

S R E W O . o . T T N o T E L N B M E S E E E E W H E T T . S o T C S Y N H E S S S J O B G K E R U A C S C P S T E K I K C H R T C O T E A H N W L L O C I I N V I T O C C G N U S I E R N T I T N S L I N D A O A P C E H R E V O

O D P

N O I T P I R C S E D T C E J O R P

N O I T N P I O R I T C P S I E R D C S M E E D T E S C Y I S - V B R U E S S

G N I T N I A P G N I N R A W T F A R C R I A R O F D E R I T D U A E Q O R I E C U R E ) Q E T T T S F A A ( T R I D O A T D F M C E O U R M C D E H L M I M R S A E I N T T I I R N N I O M P I F T

S K R A M E R

e r u t a n g i S

r e b n m i a e M ] M m d μ [ n a ) S k ( m c r e N T m i h v o O A 5 t G O C N I H r D S e m A I d E N I n m R F U 5

) O D P ( y b d e s i v r e e p m u a S N

r ] e m n b μ i m [ a e T M M A O d C n a E k T m c r e N A m i h v O I D 5 t o G E N I M r D R e A E d m T E N n m R I U 5

e r u t a n g i S

r e b n i a m e M M

) t n a t l u s n o C ( y b d e k e c e m h a C N

] m d n μ a [ k T m i c r e N A m h v O O 5 t o C G N I R r D E e m M d A I E R n m R P U 5 r e b n i a m e M M

E M A N E N I L

. O N N O I T A C O L

E P Y T R E W O T

] m d n μ [ a G m k c r e N N m i v h I O S 5 t o I G N N I A D V r e m A L d E A n m R G U 5 l e g t e n n e l c i t i t e S t n m r i e d a r A e P u t s a a c e M i r M O b a D F N k A r a f R o M e e t l a c i t D r A

e r u t a n g i S

t n e ] m e m r μ ] i [ m u e q μ e g r a [ r e ] T T v m F F μ D A [ D l l a a l a t T t t o F o o T D T T

) r o t c a r t n o C ( y b d e r u e s a e m a M N

PDO

E-NNN A4

CONSTRUCTION CHECK SHEET ELECTRICAL OVERHEAD LINES ON LATTICE STEEL TOWERS

Sheet 1 of 1

ERECTION/SAG CHART RECORD

REV 0

PROJECT DESCRIPTION

PROJECT WBS No.

SUB-SYSTEM DESCRIPTION

SUB-SYSTEM No.

SERVICE DESCRIPTION

TAG No.

A.

INDENT / CONTRACT No:

OVERHEAD LINE FROM:

TO:

SAGGING SECTION FROM:

TO:

B.

INSPECTION

Result

1.

Section length

2.

Equivalent span

3.

Ambient temperature ( C)

4.

Conductor temperature ( C)

5.

Sagging Tower No. to Tower No.

6.

Check Span Tower No. to Tower No.

7.

Sagging span length (m)

8.

Check span length (m)

9.

Dynamometers

°

°

10. Thermometers 11. Sighting Boards 12. Sagscope 13. Final Sag (m) 14. Conductor Tension (kg) 15. Midspan Joints (between Tower Nos.) 16. Conductor Repair Sleeves (between Tower Nos.) C.


COMPLETED BY CONTRACTOR

APPROVED BY CONTRACTOR

ACCEPTED BY PDO

NAME

NAME

NAME

COMPANY

COMPANY

REF. IND.

SIGN & DATE

SIGN & DATE

SIGN & DATE

REF: SP-1100

PDO

CONSTRUCTION CHECK SHEET

E-NNN A5

ELECTRICAL

OVERHEAD COMPRESSION

Sheet 1 of 1 REV 0

JOINTS PROJECT DESCRIPTION

PROJECT WBS No.


SUB-SYSTEM No.

SERVICE DESCRIPTION

TAG No.

A.


LOCATION:

SECTION LENGTH:

DRAWING REF NO:

TYPE OF STRUCTURE:

TENSION / SUSPENSION

OPERATING VOLTAGE:

CONDUCTOR TYPE:

CONDUCTOR SIZE:

B

TEST

Results Tower No

C

R-phase

Y-phase

B-phase

Shieldwire




ACCEPTED BY PDO ELECTRICAL

NAME

NAME

NAME

COMPANY

COMPANY

REF. IND.

SIGN & DATE

SIGN & DATE

SIGN & DATE

REF: SP-1100

PDO

E-NNN B1

PRE-COMMISSIONING CHECK SHEET ELECTRICAL

Sheet 1 of 2

INSTALLATION OF OVERHEAD LINES

REV 0

ON LATTICE STEEL TOWERS

INSPECTION PROJECT DESCRIPTION

PROJECT WBS No.


SUB-SYSTEM No.

SERVICE DESCRIPTION

TAG No.

A.

INDENT/CONTRACT No:

LOCATION:

SECTION LENGTH:

POLE REF No:

DRAWING REF No:

TYPE OF STRUCTURE:

□

OPERATING VOLTAGE:

CONDUCTOR TYPE:

CONDUCTOR SIZE:

TENSION

□

SUSPENSION

SAG / TENSION DRAWING REF No: WORK COMMENCED ON:

WORK COMPLETED ON:

B.

INSPECTION

1.

Check and ensure that foundations are correctly installed

2.

Check towers for mechanical damage

3.

Check and ensure that all bolts and nuts are correctly fastened.

4.

Check and ensure that the towers verticality tolerances are observed.

5.

Check and ensure that backfilling, compacting and leveling are completed

6.

Check and ensure that damages to galvanising or painting are repaired

7.

Check and ensure that all the fittings are tightened and painted to specification requirements

8.

Check and ensure that all the insulators are clean

9.

Check and ensure that line conductors are correctly clamped/strapped

10. Check and ensure that anti-climbing devices, danger & reflector plates, number plates, phase plates and name plate are fitted in correct position. 11. Check and ensure that there are no damages to the conductor (strand damages) 12. Check and ensure that sagging is correct and the records submitted.(E-NNNA2) 13. Check and ensure that jumpers for all phases are fixed and the necessary clearances maintained 14. Conduct a random check to ensure that all the clearances are correct and in accordance with specification requirements

REF: SP-1100

Results

PDO

PRE-COMMISSIONING CHECK SHEET ELECTRICAL

E-NNN B1 Sheet 2 of 2


REV 0


INSPECTION PROJECT DESCRIPTION

PROJECT WBS No.


SUB-SYSTEM No.

SERVICE DESCRIPTION

TAG No.

INSPECTION

Results

15. Check and ensure that the stub angles and foundation cap is painted according to specification requirements. 16. Check and ensure that there are not cracks on foundation cap (except hair cracks of max. 0.3mm). 17. Check and ensure that there are not bended elements on tower structure. 18. Check and ensure that there are not missing members on tower structure. 19. Check and ensure that all temporary earth and excess material are removed 20. Check and ensure that all tower areas are shaped to eliminate water ponding 21. Check and ensure that the area around the tower foundations is leveled and all excess earth removed 22. Ensure that tower painting inspection reports are attached. 23. Record the actual clearance at all road/river crossings.

C.




ACCEPTED BY PDO

NAME

NAME

NAME

COMPANY

COMPANY

REF. IND.

SIGN & DATE

SIGN & DATE

SIGN & DATE

REF: SP-1100

PDO

PRE-COMMISSIONING CHECK SHEET

E-NNN B2

ELECTRICAL

Sheet 1 of 1


REV 0


TESTS PROJECT DESCRIPTION

PROJECT WBS No.


SUB-SYSTEM No.

SERVICE DESCRIPTION

TAG No.

A.


LOCATION:

SECTION LENGTH:

DRAWING REF NO:

TYPE OF STRUCTURE:


OPERATING VOLTAGE:

CONDUCTOR TYPE:

CONDUCTOR SIZE:

FROM TOWER NO:

TO TOWER NO:

SAG / TENSION DRAWING REF NO: B

TEST

Results

1.

Ensure that prior to Site Tests, the Contractor provides Type Test and Routine Test Certificates confirming that during factory tests of equipment, the criteria for the behavior of the test object have been fulfilled and all tests have been passed successfully.

2.

Ensure that pre-commissioning checks have been carried out and the relevant Construction Test sheet completed

3.

Ensure that earth electrodes have been tested and relevant Functional Test sheets completed

4.

Ensure that compression joints tested and relevant Functional Test sheets completed

5.

Place danger notices and cordon off the test area

6.

Ensure that at tower locations subject of special requirements of safety of public Step and Touch Voltage measurements have been performed and special earthing installed

7.

Measure line resistance (complete):

8.

R-phase to Y-phase ( Ω)

9.

Y-phase to B-phase ( Ω)

10. R-phase to B-phase ( Ω) 11. Ensure OTDR measurements are within the required / guaranteed limits and relevant test sheets are attached. 12. Ensure that the results of Optical Acceptance Test (end to end) are within the required / guaranteed limits and relevant test sheets are attached. C.





NAME

NAME

NAME

COMPANY

COMPANY

REF. IND.

SIGN & DATE

SIGN & DATE

SIGN & DATE

REF: SP-1100



CHECK SHEETS AND SCHEDULES Overhead Lines on Wooden Poles

SP-1101: Specification for Installation of Overhead Transmission Lines

Printed 26/06/08


E-014A1

PDO CONSTRUCTION CHECK SHEET ELECTRICAL

Sheet 1 of 2

OVERHEAD LINE INSTALLATION PROJECT DESCRIPTION

PROJECT WBS No.


SUB-SYSTEM No.

SERVICE DESCRIPTION

TAG No.

A.

REV 2

INDENT/CONTRACT No:

LOCATION:

SECTION LENGTH:

POLE REF No:

DRAWING REF No:

TYPE OF STRUCTURE:

□

OPERATING VOLTAGE:

CONDUCTOR TYPE:

CONDUCTOR SIZE:

TENSION

SUSPENSION

□

SAG / TENSION DRAWING REF No: WORK COMMENCED ON:

WORK COMPLETED ON:

B.

INSPECTION

1.

Check and ensure that foundations are correctly installed

2.

Check poles for mechanical damage

3.

Check and ensure that all poles are impregnated with tar

4.

Check and ensure that all unused holes are plugged

5.

Check and ensure that the poles are vertically installed

6.

Check and ensure that backfilling, compacting and leveling are completed

7.

Check and ensure that cross-arms and cross-bracing are straight

8.

Check and ensure that damages to galvanising are repaired

9.

Check and ensure that all the fittings are tightened and painted to specification requirements

10. Check and ensure that all the insulators are clean 11. Check and ensure that line conductors are correctly clamped/strapped 12. Check and ensure that anti-climbing devices, danger & reflector plates, number plates, phase plates and name plate are fitted 13. Check and ensure that there are no damages to the conductor (strand damages) 14. Check and ensure that sagging is correct and the records submitted.(E-014A2) 15. Check and ensure that jumpers for all the three phases are fixed and the necessary clearances maintained 16. Conduct a random check to ensure that all the clearances are correct and in accordance with specification requirements

REF: SP-1100

Results

PDO CONSTRUCTION CHECK SHEET ELECTRICAL

E-014A1 Sheet 2 of 2


PROJECT WBS No.


SUB-SYSTEM No.

SERVICE DESCRIPTION

TAG No.

INSPECTION

Results

17. Check and ensure that stay anchors are tightened properly 18. Check and ensure that stay insulators are fixed to stay anchors 19. Check and ensure that installation of isolators, surge diverters, post insulators ball and socket insulators and drop-out fuses are satisfactory 20. Test and record earthing resistance of isolators, surge diverters post insulators ( Ω) 21. Check and ensure that isolators operate with easy movement and ability to lock-out 22. Check size of expulsion fuses and spring tension 23. Check and ensure that all temporary earth and excess material are removed 24. Check and ensure that all pole areas are shaped to eliminate water ponding 25. Check and ensure that the area around the pole foundations and guys are rammed and leveled and all excess earth removed 26. Check and ensure that all the metal parts like cross-arm, stay wires, etc., are bonded (earthing) at the top 27. Record the actual clearance at all road/river crossings

C.




ACCEPTED BY PDO

NAME

NAME

NAME

COMPANY

COMPANY

REF. IND.

SIGN & DATE

SIGN & DATE

SIGN & DATE

REF: SP-1100

REV 2

PDO CONSTRUCTION CHECK SHEET

E-014A2

ELECTRICAL

OVERHEAD LINE ERECTION/SAG CHART RECORD PROJECT DESCRIPTION

PROJECT WBS No.


SUB-SYSTEM No.

SERVICE DESCRIPTION

TAG No.

A.

Sheet 1 of 1 REV 2


OVERHEAD LINE FROM:

TO:

SAGGING SECTION FROM:

TO:

B.

INSPECTION

Result

1.

Section length

2.

Equivalent span

3.

Ambient temperature ( C)

4.

Conductor temperature ( C)

5.

Sagging Pole No to Pole No.

6.

Sagging span length (m)

7.

Dynamometers

8.

Thermometers

9.

Sighting Boards

°

°

10. Sagscope 11. Final Sag (m) 12. Conductor Tension (kg) 13. Midspan Joints (Between Pole Nos.) 14. Conductor Repair Sleeves (Between Pole Nos.)

C.




ACCEPTED BY PDO

NAME

NAME

NAME

COMPANY

COMPANY

REF. IND.

SIGN & DATE

SIGN & DATE

SIGN & DATE

REF: SP-1100

E-014B1

PDO PRE-COMMISSIONING CHECK SHEET

Sheet 1 of 2

ELECTRICAL


PROJECT WBS No.


SUB-SYSTEM No.

SERVICE DESCRIPTION

TAG No.

A.

REV 1


LOCATION:

SECTION LENGTH:

DRAWING REF NO:

TYPE OF STRUCTURE:


OPERATING VOLTAGE:

CONDUCTOR TYPE:

CONDUCTOR SIZE:

FROM POLE NO:

TO:

SAG / TENSION DRAWING REF NO: B

TEST

1.

Ensure that pre-commissioning checks have been carried out and the relevant Construction Test sheet completed

2.

Ensure that earth electrodes have been tested and relevant Functional Test sheets completed

3.

Ensure that cables have b een tested and relevant Functional Test sheets completed

4.

Ensure that compression joints tested and relevant Functional Test sheets completed

5.

Place danger notices and cordon off the test area

6.

HV pressure test between R-phase to (Y-phase + B-phase): Insulation resistance before HV pressure test (M Ω) Applied Voltage (KV dc) Leakage current (mA) Duration of test (min) Insulation resistance after HV pressure test (M Ω)

7.

HV pressure test between Y-phase to (R-phase + B-phase): Insulation resistance before HV pressure test (M Ω) Applied Voltage (KV dc) Leakage current (mA) Duration of test (min) Insulation resistance after HV pressure test (M Ω)

REF: SP-1100

Results

E-014B1

PDO PRE-COMMISSIONING CHECK SHEET

Sheet 2 of 2

ELECTRICAL


PROJECT WBS No.


SUB-SYSTEM No.

SERVICE DESCRIPTION

TAG No.

8.

REV 1

HV pressure test between B-phase to (R-phase + Y-phase): Insulation resistance before HV pressure test (M Ω) Applied Voltage (KV dc) Leakage current (mA) Duration of test (min) Insulation resistance after HV pressure test (M Ω)

9.

HV pressure test between Earth to (R-phase + Y-phase + B-phase): Insulation resistance before HV pressure test (M Ω) Applied Voltage (KV dc) Leakage current (mA) Duration of test (min) Insulation resistance after HV pressure test (M Ω)

10. Measure line resistance (complete): 11. R-phase to Y-phase (Ω) 12. Y-phase to B-phase (Ω) 13. R-phase to B-phase ( Ω) C.





NAME

NAME

NAME

COMPANY

COMPANY

REF. IND.

SIGN & DATE

SIGN & DATE

SIGN & DATE

REF: SP-1100

E-014B2

PDO COMMISSIONING CHECK SHEET ELECTRICAL

OVERHEAD COMPRESSION

Sheet 1 of 1 REV 1

JOINTS PROJECT DESCRIPTION

PROJECT WBS No.


SUB-SYSTEM No.

SERVICE DESCRIPTION

TAG No.

A.


LOCATION:

SECTION LENGTH:

DRAWING REF NO:

TYPE OF STRUCTURE:


OPERATING VOLTAGE:

CONDUCTOR TYPE:

CONDUCTOR SIZE:

B

TEST

Results Pole No

C

R-phase

Y-phase

B-phase

Neutral





NAME

NAME

NAME

COMPANY

COMPANY

REF. IND.

SIGN & DATE

SIGN & DATE

SIGN & DATE

REF: SP-1100

Installation of Overhead Transmission Lines

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