Guidance on Industry Standard for Skid Mounted Units

Document No. Applicability Date

GIS 40-101

Group 16 December 2005

Guidance on Industry Standard for Skid Mounted Units Procurement

GIS 40-101

BP GROUP ENGINEERING TECHNICAL PRACTICES

16 December 2005

GIS 40-101 Guidance on Industry Standard for Skid Mounted Units Procurement

Foreword This This is the firs firstt issu issuee of Engi Engine neer erin ing g Tech Techni nica call Prac Practi tice ce (ETP (ETP)) BP GIS GIS 40-101 40-101.. This This Guid Guidan ance ce on Indu Indust stry ry Stan Standa dard rd (GIS (GIS)) is base based d on the the foll follow owin ing g heri herita tage ge docu docume ment ntss from from merg merged ed BP comp compan anie ies: s:

Amoco A PE-SMU-00-P

Packaged Equipment Skid Mounted Units Procurement Specification

This GIS was written by an external engineering contractor using heritage material and did not have internal BP review before publishing. The ETP Working Group has approved a revision programme using a new external contactor with greater global reach, which is now underway. The updated GIS will have BP internal review prior to re-issue. In the meantime TAs and EAs should ensure clear guidance is given over implementation of this GIS.

Copyright  2005, BP Group. All rights reserved. The information contained contained in this document is subject to the terms and conditions of the agreement or contract under which the document was supplied to the recipient’s organization. None of the information contained in this document shall be disclosed outside the recipient’s own organization without the prior written permission of Director of Engineering, BP Group, unless the terms of such agreement or contract expressly allow.

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16 December 2005


Table of Contents Page Foreword ........................................................................................................................................ 2 1.

Scope .................................................................................................................................... 5

2.

Normative references............................................................................................................. 5

3.

Definitions.............................................................................................................................. 6

4.

Abbreviations ......................................................................................................................... 7

5.

Skid requirements.................................................................................................................. 8 5.1. 5.2.

6.

7.

8.

General....................................................................................................................... 8 Arrangement............................................................................................................... 8

Structural design.................................................................................................................... 8 6.1. General....................................................................................................................... 8 6.2. 6.3. 6.4.

Design loads ............................................................................................................... 9 Lifting........................................................................................................................ 11 Pulling....................................................................................................................... 12

6.5.

Structural details ....................................................................................................... 12

6.6.

Structural materials................................................................................................... 13

Fabrication........................................................................................................................... 13 7.1. 7.2.

Skid construction ...................................................................................................... 13 Structural welding ..................................................................................................... 14

7.3.

Drainage and access areas ...................................................................................... 15

Piping .................................................................................................................................. 15 8.1. 8.2. 8.3.

Design ...................................................................................................................... 15 Equipment piping ...................................................................................................... 16 Instrumentation tubing .............................................................................................. 16

9.

Equipment ........................................................................................................................... 17

10.

Electrical .............................................................................................................................. 17 10.1. General..................................................................................................................... 17 10.2. Equipment ................................................................................................................ 17 10.3. Power ....................................................................................................................... 17 10.4. Wire and cable.......................................................................................................... 18 10.5. Wiring methods......................................................................................................... 18 10.6. Lighting..................................................................................................................... 19 10.7. Grounding................................................................................................................. 19 10.8. Nameplates .............................................................................................................. 19

11.

Instrumentation .................................................................................................................... 19 11.1. General..................................................................................................................... 19 11.2. Tagging..................................................................................................................... 20 11.3. Pneumatic instrumentation........................................................................................ 20 11.4. Electrical instrumentation.......................................................................................... 20

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11.5. Pressure instruments ................................................................................................ 21 11.6. Temperature instruments .......................................................................................... 21 11.7. Level instruments...................................................................................................... 22 11.8. Flow instruments....................................................................................................... 22 11.9. Control valves and regulators ................................................................................... 23 11.10. Pressure relief devices.............................................................................................. 23 12.

Inspection and testing.......................................................................................................... 23 12.1. General..................................................................................................................... 23 12.2. Fabricated piping inspection ..................................................................................... 24 12.3. Assembly inspection ................................................................................................. 24 12.4. Structural inspection ................................................................................................. 24 12.5. Instrumentation inspection ........................................................................................ 25 12.6. Electrical inspection .................................................................................................. 25 12.7. Painting inspection.................................................................................................... 25 12.8. Hydrostatic or pneumatic testing............................................................................... 25 12.9. Insulation inspection ................................................................................................. 25 12.10. Certifications............................................................................................................. 26

13.

Preparation for shipment...................................................................................................... 26 13.1. General..................................................................................................................... 26 13.2. Partially dismantled and properly prepared export shipment ..................................... 26 13.3. Openings protection.................................................................................................. 26 13.4. Skid preparation........................................................................................................ 27

14.

Documentation .................................................................................................................... 27

List of Figures Figure 1 – Skid end design ........................................................................................................... 28

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1.

2.


Scope a.

This GIS provides guidance on health, safety and environmental legislation, good design practice, and technical and economic considerations for skid mounted units. The design information included in this specification is not intended to cover complete details. The guideline outlines regulations, design considerations, and recommends a configuration which can be scaled to adapt to the specific facilities which can differ due to layouts and production capacity.

b.

This standard is intended to guide the purchaser in the use or creation of a fit-for-purpose specification for enquiry or purchasing activity.

c.

This document may refer to certain local, national or international regulations but the responsibility to ensure compliance with legislation and any other statutory requirements lies with the user. The user shall adapt or supplement this document to ensure compliance for the specific application.

Normative references The following normative documents contain requirements that, through reference in this text, constitute requirements of this technical practice. For dated references, subsequent amendments to, or revisions of, any of these publications do not apply. However, parties to agreements based on this technical practice are encouraged to investigate the possibility of applying the most recent editions of the normative documents indicated below. For undated references, the latest edition of the normative document referred to applies.

American Institute of Steel Construction (AISC) AISC S326

Specification for the Design, Fabrication and Erection of Steel for Buildings

AISC S329

Allowable Stress Design Specification for Structural Joints Using ASTM A325 or A490 Bolts

AISC S335

Specification for Structural Steel Buildings Allowable Stress Design and Plastic Design

American Petroleum Institute (API) API RP 2A-LRFD

Recommended Practice for Planning, Designing and Constructing Fixed Offshore Platforms—Load and Resistance Factor Design

API RP 2A-WSD

Recommended Practice for Planning, Designing and Constructing Fixed Offshore Platforms—Working Stress Design

API SPEC 5L

Specification for Line Pipe

API RP 551

Process Measurement Instrumentation

API STD 660

Shell-and-Tube Heat Exchangers for Refinery Service

API STD 661

Air-Cooled Heat Exchangers for General Refinery Service

American Society of Civil Engineers (ASCE) ASCE 7

Minimum Design Loads for Buildings and Other Structures

American Society of Mechanical Engineers (ASME) ASME B16.5

Pipe Flanges and Flanged Fittings

ASME B31.3

Chemical Plant and Petroleum Refinery Piping

ASME BPVC

Boiler and Pressure Vessel Code; SEC VIII D1, Rules for Construction of Pressure Vessels, Division 1; SEC IX, Qualification

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16 December 2005


Standard for Welding and Brazing Procedures, Welders, Brazers, and Welding and Brazing Operators

American Society for Testing and Materials (ASTM) ASTM A36 / A36M

Standard Specification for Structural Steel

ASTM A53

Standard Specification for Pipe, Steel, Black and Hot-Dipped, ZincCoated Welded and Seamless

ASTM A106

Standard Specification for Seamless Carbon Steel Pipe for HighTemperature Service

ASTM A123

Standard Specification for Zinc (Hot-Dip Galvanized) Coatings on Iron and Steel Products (AASHTO M111)

ASTM A153

Standard Specification for Zinc Coating (Hot-Dip) on Iron and Steel Hardware (AASHTO M232)

American Welding Society (AWS) AWS D1.1

Structural Welding Code Steel

GIS 40-102

Skid Mounted Units Lifting and Rigging Requirements

GP 12-25

Earthing / Grounding

GP 40-10

Structural Skids and Skid Mounted Units Guide

BP

Illumination Engineering Society (IES) IES Lighting Handbook

National Electrical Manufacturer's Association (NEMA) NEMA 250

Enclosures for Electrical Equipment (1000 Volts Maximum)

National Fire Protection Association (NFPA) NFPA 70

National Electrical Code (NEC)

Occupational Safety & Health Administration (OSHA)” 29 CFR, Part 1910

Walking-Working Surfaces, Subpart D

US Department of the Interior (DOI), Minerals Management Service (MMS) 30 CFR Part 250

Oil and Gas and Sulfur Operations in the Outer Continental Shelf

Uniform Building Code (UBC)

3.

Definitions dead loads

Loads which are permanent parts of the structure such as empty permanent equipment, empty pipe, cable and conduit, grating, instruments, valves, structural members, hand rails and platforms. erection loads

Loads which are temporary forces caused by erection of structures or equipment. fluid loads

Weight of operating or hydrotest fluid in equipment and pipe (whichever is larger). impact loads

Loads which are an equivalent static force caused by a moving object.

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live loads

Loads which are temporary in nature such as occupants, repair and maintenance tools/equipment. maintenance loads

Loads which are temporary forces caused by the dismantling, repair or painting of equipment. padeye

A small fitting with a hole, used to provide a fairlead, or guide a line; a metal eye on a small plate to which blocks, lines and other objects are shackled. seismic loads

Forces associated with acceleration of the skids as it is supported on the offshore deck during a seismic event. transportation loads

Forces associated with pitching, rolling and heaving when a skid is aboard an offshore transport vessel. thermal loads

Thermal Loads are those forces caused by a change in temperature which may result from both operating and environmental conditions. Such forces shall include those caused by vessel or piping expansion or contraction and structures’ expansion or contraction. vibration loads

Loads which are those forces caused by vibrating machinery such as pumps, blowers, fans and compressors. Included are surge forces similar to those acting in fluid cokers, hydroformers, crackers and pipe. wind loads

Minimum design wind loading for skids shall be based on 110 mph. Force coefficients and loads shall be per API-RP 2A.

4.

Abbreviations For the purpose of this GIS, the following abbreviations apply: AWG

American Wiring Gauge

DC

Direct Current

LRFD

Load and Resistance Factor Design

NDT

Non Destructive Test

NPS

Nominal Pipe Size

OD

Outer Diameter

PVC

Poly Vinyl Chloride

RTD

Resistance Temperature Detector

WSD

Working Stress Design

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5. 5.1.


Skid requirements General a.

Unless otherwise approved by Company, outside skid dimensions shall not exceed 12.2 m (40 ft) long by 3.7 m (12 ft) wide by 4.3 m (14 ft) high. The width and length of skids are normally dependent on the intermediate and final modes of transportation. Skid width may be determined by the local requirements of roadways or the width of the bay of a cargo ship hold. The height if transported by truck on roads is determined by the height of overpasses and overhead electrical power lines. Special permitting may alleviate the height restrictions as some obstacles like overhead power lines can temporarily be removed. If a skid is built on the coast of an ocean or major water way and the facility is offshore on near shore, then the possibility is that a barge could be used and height and width restrictions may be increased.

b.

5.2.

Arrangement a.

b.

c.

6. 6.1.

Skid mounted equipment, piping, vessels, and other components shall be within confines of skid outer edge. See GP 40-10.

Equipment shall be mounted and installed in accordance with manufacturer’s recommendations. Skid shall be: 1.

Rectangular.

2.

Designed such that equipment may be removed or maintained.

3.

All grating panels shall span in the same direction and shall be removable.

Piping and instrumentation systems shall be designed to enable isolation and removal of equipment, including: 1.

Isolation block valves and spool pieces (or unions) without bending or cutting pipe.

2.

Drainable piping systems.

3.

Skid piping tie-ins flanged and piped to skid edge.

Access shall be provided to accomplish daily operating tasks and routine maintenance from skid edge or through open areas with walkways, platforms, or both as follows: 1.

Stairs, ladders, cages, platforms, handrails, etc., shall be provided as required, and shall conform to the following requirements as well as those of the local country regulations similar to OSHA.

2.

Instrumentation panels and local gauge boards shall be accessible from one side of skid or centralized in an open access area.

3.

Manual valves, switches, pushbuttons, and other devices required for daily operation shall be located within convenient reach of skid edge or an open access area.

4.

Access areas with walkways or platforms shall be free of tripping hazards, overhead obstructions, dead ends, and constricted passageways.

Structural design General a.

USA codes and standards are stated by this GIS however, equivalent European or local country codes and standards may be used if agreed by BP.

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b.

Structural design shall be performed in accordance with AISC S326, S329, and S335, as applicable. API RP 2A shall apply for offshore installations.

c.

Minimum design loads shall be determined in accordance with ASCE 7. Seismic loads shall be in accordance with ASCE 7 or Uniform Building Code.

d.

Wind loads shall be based on:

e.

f.

g.

1.

Importance factor of Category III.

2.

Velocity pressure and gust response factor of exposure C for inland and coastal and exposure D for offshore installations.

Design considerations shall include: 1.

Location (land or marine).

2.

Equipment static and dynamic loads.

3.

Foundations, tie-downs, or anchorage.

Skid installations shall be sufficiently rigid to prevent damage during fabrication, assembly, transportation, or installation. 1.

Skid assemblies with rotating equipment as major components shall be designed with a maximum deflection value of 0.025 mm per 25.4 mm (0.001 inch per inch) of skid length for loading conditions.

2.

Other skids shall be designed with a maximum deflection value of L/300, where L is skid length.

Skid structures shall be designed for the most severe effect of the following loads during: 1.

Fabrication, assembly, and hydrostatic / pneumatic test.

2.

Transportation (land, sea, or air).

3.

Lifting and skidding on concrete supports or platform deck.

4.

Service, including effects of vibration, impact, and fatigue.

6.2.

Design loads

6.2.1.

General

a.

Loads which are permanent parts of structures such as equipment, empty pipe and vessels, etc. shall be classified as dead loads or empty loads. Loads which are temporary, such as occupants, repair / maintenance tools, cranes, equipment and loose parts or as specified by a code or standard shall be classified as live load loads. Wind load, seismic load, snow, rain, soil active or passive pressures, thermal or hydraulic loads shall be those loads specified herein for the processing facilities, and constitute live loads.

b.

Unless otherwise specified by Company, skid shall be designed as a simple beam supported at the extreme ends. Loads shall include:

c.

1.

Skid dead loads.

2.

Equipment.

3.

Piping and supports.

4.

Piping reactions.

5.

Fluid loads.

6.

Live loads

A factor of 1.1 shall be applied to loads.

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d. 6.2.2.


Stress shall be limited to basic allowables.

Erection loads

Erection loads shall be considered in load combinations as live load. 6.2.3.

Impact loads

For structures supporting live loads that induce impact, the assumed live load shall be increased sufficiently to provide for the impact. Impact loads are especially high if the skid is to be lifted to an offshore fixed platform, FPSO, semi-submersible, or similar oil and gas production structure. The normal wave height at location needs to determined and used in the load calculation. If the normal wave height is 3m (10 ft) then the worse case would be that the entire skid is dropped from the normal wave height. What actually happens is the cargo ship goes down with the wave and the skid is lifted with the slings and shackles. If the crane does not lift the skid quick enough, then the boat rises on the other side of the wave and impacts the skid and actually lifts the skid to the point that the slings and shackles are loosened. 6.2.4.

6.2.5.

Maintenance loads

a.

Maintenance loads shall be considered in load combinations as live load.

b.

Heat exchanger supports shall be designed to withstand a longitudinal bundle pull force equal to 50% of the tube bundle weight or 907 Kg (2,000 pounds), whichever is greater. Bundle pull shall have same load factor as wind load.

Rain loads

Refer to ANSI / ASCE 7-88 for the effect of pounding due to rain loads on building and enclosed structure roofs. 6.2.6.

Seismic loads

Seismic Zone shall be specified in ANSI/ASCE 7-88 or pertinent national code of country in which plant is located. 6.2.7.

Self-straining forces

Consideration of self-straining forces such as differential settlement, moisture expansion, shrinkage and creep shall be given in design of all structures and supports. 6.2.8.

6.2.9.

Thermal loads

a.

Thermal stresses and deflections of assembly shall be within allowables of equipment tolerances.

b.

Thermal loads and displacements caused by operating conditions shall be based on the design temperature of the equipment rather than the operating temperature.

c.

Ambient temperature ranges from a maximum of 100F (38C) to a minimum of 15F (-9.4C) except in desert or arctic environment, or unless otherwise specified.

Transportation loads

a.

Unless otherwise specified, equipment connections to skid, skid structure, and skid tiedowns to transportation vehicle, ship, or barge shall be sized for a 1 g horizontal load, in any direction in conjunction with a vertical acceleration of  0.5 g combined with total dead load.

b.

A load factor of 1 shall be used, and a 1/3 increase in allowable stress shall be permitted.

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6.2.10.

6.2.11.

6.3.


Vibration loads

a.

Rotating equipment skid components shall be designed such that natural frequency of skid, as a whole or as individual components, lies outside the range of 0.50 to 1.50 times equipment operating frequency.

b.

Dynamic stress and deflection amplitude shall not exceed equipment tolerances.

c.

Maximum peak vibration velocity shall be less than 2,54 mm (0.1 in) per second.

Wind loads

a.

Wind loads for offshore application shall be calculated in accordance with API RP 2A-WSD or API RP 2A-LRFD.

b.

If storm windloads are combined with static loads, a 20 % increase in allowable stress shall be permitted.

Lifting a.

Skid supplier shall provide lifting rigging design. Review requirements in GIS 40-102.

b.

For four-sling pyramid lifting arrangements (hook point located directly above package center of gravity), lifting slings, frames spreader bars, padeyes, shackles, and major structural members of skid assembly shall be designed for two load conditions in accordance with the following: 1.

2.

c.

If lift load is split equally between the two diagonals: a)

Calculated Weight Contingency

1.1

b)

Impact:

Onshore lift

1.5

c)

Impact:

Offshore lift

2.0

For skew load effect, a 25%-75% split of lifting load shall be applied across the two diagonals: a)

Calculated Weight Contingency

1.1

b)

Impact:

Onshore lift

1.15

c)

Impact:

Offshore lift

1.40

3.

For lifts with spreader bars, approval for percent split and impact factors shall be obtained from Company.

4.

For lift conditions, no increase in basic allowable stresses shall be permitted.

5.

Maximum loads on shackles shall not exceed manufacturer’s testing load on shackles and maximum safe working load times a factor of 1.5.

6.

Maximum loads on slings shall not exceed 33% of certified minimum breaking strength of slings.

Padeyes and connections to supporting structural members shall be designed for maximum sling loads in combination with an out-of-plane horizontal force to compensate for any side loading on padeye. 1.

Horizontal force shall be not less than 5% of sling load applied perpendicular to padeye at pinhole center.

2.

If spreader bars are used, value shall be 10%.

3.

Padeye design shall include the following stress checks:

4.

Bearing against shackle pin.

5.

Double shear for pin pull-out.

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6.4.


6.

Tension through net section.

7.

Combined stresses at various locations.

d.

True sling angles shall be limited to a range from 60 to 75 degrees from horizontal.

e.

If large spreader frames are used, vertical slings may be permitted.

Pulling a.

Skid assemblies shall have transverse tubular member (pull bars) or padeyes designed for pulling in accordance with Figure 1.

b.

Design pull forces shall be 20% of gravity operating load of skid assembly, minimum.

c.

For skew effect, pull load shall be distributed to each padeye of end of pull bar using 25%75% distribution.

d.

Padeyes for pulling shall be designed: 1.

With same safety factor as lifting padeyes.

2.

Same as lifting padeyes, except horizontal design load shall be 50% of calculated pulling load on each padeye.

6.5.

Structural details

6.5.1.

Load carrying members

6.5.2.

6.5.3.

a.

Load carrying members in skid assembly shall be compact sections.

b.

Spacing of transverse bracings shall not be greater than Lc of load carrying longitudinal skid beams, where Lc is as defined in AISC.

c.

Webs of load carrying beams shall be designed to transmit shear and bearing loads without crippling.

d.

Plate, stiffeners, and beam or tubular sections in skid assembly shall be 6,35 mm (0.25 in) thick, minimum.

e.

Metal thickness at points of equipment bolting shall be 9,5 mm (0.375 in), minimum.

f.

Structural members with cut-outs of holes shall be checked for stress levels at net sections, including stress concentrations.

g.

If stresses exceed allowables, reinforcement shall be provided.

Connections

a.

Connections shall be designed to develop full strength of connecting members.

b.

Unless otherwise specified, connections shall use full penetration welds.

c.

Fillet welds, partial penetration welds, and bolted connections, if approved by Company, shall be sized in accordance with AISC.

Padeyes

a.

The padeyes and skid base shall be designed for an offshore lift based on the requirements of API RP 2A.

b.

The skid shall be equipped with 4 padeyes adequately designed and properly spaced to ensure a safe lift without the use of a spreader bar or spreader frame if possible. Slings, shackles and fittings shall be sized to meet the requirements of API RP 2A for offshore lifts. Sling angles shall be greater than or equal to 60o.

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c.

The padeyes shall be located to provide for lifting the skid package near level with the maximum tilt allowed to be 5 degrees from horizontal. Equipment and facilities shall be located on the skid to avoid interference with slings during lifting operations.

d.

Padeyes on each structural unit (skid base, lifting frame, or spreader bar) shall be identical and designed for maximum lifting load.

e.

Padeyes shall be located to avoid interference between rigging and skid assembly and orientated such that primary sling load is in the plane of padeye main plate.

f.

Padeyes shall be designed for specific shackle and sling size with the following clearance requirements:

g.

6.6.

7. 7.1.


1.

Pinhole diameter shall be 3 mm (0.125 in) to 6 mm (0.25 in) larger than shackle pin diameter.

2.

Clearance between shackle jaw width and padeye (main plate plus cheek plates) thickness shall be 10 mm (0.375 in), minimum, 16 mm (0.625 in), maximum.

3.

Clearance between outer radius of main plate and sling shall be 0.5 times sling diameter.

Padeye designs shall avoid passing tensile stresses through material thicknesses.

Structural materials a.

Skid and support structural steel shapes, plates, pipes rolled from plate, and bars shall be ASTM A36 / A36M.

b.

Seamless steel structural tubulars shall be ASTM A106 Grade B, ASTM A53 Grade B, or API 5L Grade B.

c.

Bolts, nuts, washers, and joint design shall be in accordance with AISC S329.

d.

Bolts shall conform to ASTM A193 Grade B7.

e.

Nuts shall conform to ASTM A194 Grade 2H.

f.

Bolts and grating clips shall be hot-dip galvanized in accordance with ASTM A153.

g.

Grating and handrails shall be hot-dip galvanized in accordance with ASTM A123.

h.

Floor plate shall be non-skid, checkered, or raised-pattern.

Fabrication Skid construction a.

Dimensional tolerances shall conform to API RP 2A-WSD or API RP 2A-LRFD and AWS D1.1.

b.

Weld slag and splatter shall be removed.

c.

Burrs, temporary tack welds, and sharp edges shall be ground smooth prior to coating.

d.

Skid mounted assemblies, including piping, guards, ladders, platforms, and railings, shall be erected prior to coating.

e.

If disassembly for shipment or field erection is required, clips shall be installed and required connection materials, such as bolts, nuts, and washers, plus an additional 10% shall be furnished.

f.

Skids shall be fabricated and constructed in accordance with AISC S326 for welded components and AISC S329 for bolted components.

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g.

Equipment and vessels weighing more than 300 pounds dry weight shall be connected or welded directly to skid structural members.

h.

If supplied, floor plate shall be cut back and seal welded around pad penetrations.

i.

Rotating equipment mounting pads shall be machined flat and parallel to within 0,05 mm per meter (0.002 inch per foot) after welding to skid supports.

j.

k.

7.2.


1.

Stainless steel, slotted, shim packs, 3 mm (0.125 in), minimum, shall be supplied under each foot.

2.

Horizontal and vertical jack screws shall be supplied at each foot of rotating equipment weighing more than 136 kg (300 lbs).

Skids shall have vertical jacking screws along main longitudinal members. 1.

Intervals shall be 1524mm (5 ft), maximum.

2.

Anchor bolt holes shall be located in same reinforced area as jacking screws.

If inland-grouted skids are specified, each skid compartment shall have 153 mm (6 in) diameter grout holes in the center area with a 38 mm (1 1/2 in) raised lip. Corners of separate compartments shall have 6 mm (0.25 in) grouting vent holes.

Structural welding a.

Structural components shall be welded in accordance with AWS D1.1.

b.

Approval of weld procedures shall be obtained from Company.

c.

Welding personnel shall be qualified in accordance with AWS D1.1, Section 5.

d.

Weld connections for both perimeter beams and main crossbeams shall be full penetration.

e.

For skids specified for application offshore or within 50 miles of coast, continuous seal weld , 3 mm (0.125 in) minimum, shall be placed: 1.

At contact edges of floor plate and drainage plate including supporting fixtures.

2.

On underside of plates at stringer or support-member-to-plate intersection.

3.

At other areas where corrosion may result.

f.

Skid areas shall not trap or hold drainage liquids.

g.

Inaccessible areas shall be boxed in and seal welded.

h.

Gas metal arc welding (GMAW) shall not be used.

i.

Backing strips shall not be used.

j.

Vertical down welding or peening shall not be performed.

k.

Welding inspection shall be:

l.

1.

Performed in accordance with AWS D1.1, Section 6.

2.

Accepted in accordance with AWS D1.1, Section 8.15.

Extent of inspection shall be as follows: 1.

Padeyes, padears, trunions, and members connected to lifting points shall be 100% visual, 100% magnetic particle, and 100% radiography or ultrasonic inspected.

2.

Spliced joint members shall be 100% visual, 100% magnetic particle, and 10% radiography or ultrasonic inspected.

3.

Other skid members shall be 100% visual and 10% magnetic particle inspected.

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7.3.

b.

8.1.

4.

Secondary equipment support member and walkways, ladders, handrails, stairs, and decking shall be 100% visual inspected.

5.

If defective welds are discovered, additional testing shall be required. Amount of additional testing shall be obtained from Company.

Drainage and access areas a.

8.


Areas beneath equipment or vessels subject to spills or leaks shall: 1.

Have sloped drainage areas, sloping 25 mm per 2,540 mm (1 inch per 100 inches), minimum.

2.

Be constructed with 6 mm (0.25 in) plate, minimum.

3.

Be supported in spans of 1 m (36 in), minimum.

Grating shall: 1.

Be non-skid.

2.

Be serrated bar type.

3.

Have a 38 mm by 5 mm (1.5 in by 0.1875 in) opening size, minimum.

4.

Not be used as a mounting surface for equipment or supports

c.

Unsupported grating span shall be 1200 mm (48 inches), maximum.

d.

Grating joints shall occur at points of support.

e.

Grating bearing bars shall be 38 mm by 6 mm (1.5 in by 0.25 in), minimum, on 32 mm (1.25 in) centers.

f.

Floor plate shall be 6 mm (0.25 in) thick, minimum, and have non-skid construction.

g.

Maximum unsupported spans shall be 1 m (36 inches), maximum.

h.

Platforms and stairs shall be constructed with grating. 1.

Platforms shall be 1 m (36 in), minimum, in width.

2.

Ladders shall be 400 mm (16 inches), minimum, in width.

3.

Rungs shall be deformed bar 19 mm (0.75 in), minimum, in diameter.

Piping Design a.

NPS of 1 1/4, 2 1/2, 3 1/2, and 5 shall not be used.

b.

Carbon steel process piping shall be seamless.

c.

Process piping shall be hydrostatically tested to 1.5 times maximum allowable working pressure in accordance with ASME B31.3.

d.

Skid external connections shall be flanged and shall be NPS 1, minimum. 1.

Socket welded, flange connections shall be used for process piping components NPS 1 to 1 1/2.

2.

Weldneck flange connections shall be used for carbon steel process piping components NPS 2 and larger.

3.

Skid drain connections shall be 25 mm (1 in), minimum, and may be threaded.

4.

Lap joints shall be used in stainless steel service, except in cyclic service or if vibration is present.

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16 December 2005

8.2.

8.3.


e.

Piping shall conform to applicable sections of ASME B31.3.

f.

Forces and moments on equipment nozzles shall not exceed equipment manufacturer’s recommendations or industry standards for the equipment.

g.

Flanges shall conform to ASME B16.5.

h.

Process drains and vents shall be connected to a common header and run to edge of skid.

Equipment piping a.

Rotating equipment suction and discharge piping shall have breakout spool pieces.

b.

Rating of piping flange shall match connected equipment nozzle.

c.

Spool pieces shall be removed during shipping.

d.

Block valve shall be provided near each nozzle on auxiliary equipment items for isolation purposes.

e.

Unless specified otherwise, cooling water connections to equipment shall be designed with upward flow.

f.

Drains shall be provided at low points.

g.

Vents shall be provided at high points.

h.

If temperature control is not provided, a throttling valve shall be installed on one side of each cooler or jacket water system.

Instrumentation tubing a.

Instrument tubing shall have OD of 10 mm (0.375 in), minimum, except for control panels which shall have minimum tubing OD of 6 mm (0.25 in).

b.

Impulse lines shall: 1.

Be tubing, if practical.

2.

Be less than 9 m (30 ft).

3.

Have a diameter of 10 mm (0.375 in) OD, minimum.

4.

Be seamless.

c.

If slopes are not required, tubing runs shall be plumb or level. Bends shall be made with tubing benders sized for applicable tubing.

d.

Tubing shall be routed in tray, on channel, or on angle.

e.

1.

Tubing shall be supported at least vertically every 1 m (3 ft), horizontally every 2,4 m (8 ft), and within 150 mm (6 in) of tangents on a change of direction.

2.

Control panel tubing shall be tagged at both ends.

Instrument tubing runs shall be grouped. 1.

For parallel runs, fittings, such as connectors, unions, and tees, shall be staggered and raised to enable breakout or tightening without distortion or damage to adjoining tubing.

2.

Groups shall be installed such that single lines may be removed without disturbing other tubing runs.

f.

Tubing shall be 316 stainless steel with compression fittings.

g.

Tubing valves shall be globe, needle, or ball type.

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16 December 2005

9.

10.


h.

Globe and needle valves shall have 316 stainless steel bodies and stems with Teflon packing and stem tips or stem seats, minimum.

i.

Approval of tubing and tubing fitting supplier shall be obtained from Company.

Equipment a.

Pressure vessels shall be designed and constructed in accordance with ASME BPVC, Section VIII, Division 1.

b.

Welding personnel shall be qualified in accordance with ASME BPVC, Section IX.

c.

Shell and tube heat exchangers shall be designed and fabricated in accordance with API STD 660.

d.

Air-cooled heat exchangers shall be designed and fabricated in accordance with API STD 661.

Electrical

10.1.

General a.

Unless otherwise specified, electrical installation, equipment, and wiring shall be designed to operate in an ambient temperature of 40°C (104°F).

b.

If skid unit is to be located in a hazardous (classified) area, equipment and wiring methods shall be in accordance with NEC, Articles 500 through 503.

c.

Control and alarm circuits shall be of fail-safe design. Alarm contacts shall open to initiate alarms.

10.2.

Equipment

10.2.1.

Motor controllers

10.2.2.

a.

Unless specified otherwise, motor controllers shall be furnished by others and be located off skid.

b.

Other control equipment and devices required to complete motor control system shall be furnished, installed, and wired by supplier.

Enclosures

a.

10.3.

Junction boxes, panel boards, and control enclosures shall be: 1.

Corrosion resistant.

2.

Compliant with specified NEC area classification.

3.

NEMA Type 4X, minimum, in nonclassified, outdoor areas.

4.

Equipped with drain and breather fittings.

b.

Wiring inside enclosures shall be routed, bundled, and tied or supported in plastic conductor raceways.

c.

Terminals in enclosures shall be mounted on stand-offs or on mounting strips.

Power 1. Each 480-volt load shall be supplied by an individual feeder. 2. Feeder shall be 480-volt, three-phase, 3-wire, ground-wire circuit routed directly to load from a dedicated junction box located on skid edge.

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16 December 2005


3. Feeder for each voltage level lower than 480 volts shall run to skid edge and shall connect to a single, skid-mounted junction box complete with terminals.

10.4.

Wire and cable a.

b.

Wire for voltages 600 volts and lower shall be single-conductor, stranded copper THHN / THWN. 1.

Minimum conductor size for power circuits shall be 12 AWG.

2.

Minimum conductor size for control circuits shall be 14 AWG.

Wiring for instrumentation shall be twisted, shielded, and either pair or triad construction, 16 AWG.

10.5.

Wiring methods

10.5.1.

General

a.

10.5.2.

10.5.3.

Interconnecting wiring shall be enclosed in conduit, raceways, junction boxes, or panel boards. 1.

Conduit fittings shall be supplied and installed where required.

2.

Drain fittings shall be installed in vertical conduit runs.

3.

Sealing fittings shall not be poured.

b.

Alarm, instrument, and control devices shall be wired to terminal blocks mounted in junction boxes.

c.

Separate junction boxes and cable runs shall be provided for the following: 1.

Thermocouples.

2.

Instrument signals.

3.

120 volt AC control and power.

4.

DC pulsed or switched signals.

d.

Junction boxes shall be mounted at edge of skid. Final location of boxes shall be shown on drawings. Prior to fabrication, approval for location shall be obtained from Company.

e.

Terminals shall be tubular clamps and rated for 600 volts for power and 300 volts for instruments and thermocouples. 1.

Each terminal strip shall have 20% spare terminals.

2.

Two conductors, maximum, shall be terminated at a single terminal point.

3.

Terminals shall be numbered in compliance with wiring diagrams.

Wiring

a.

Wires shall be tagged at both ends with slip-on plastic wire markers printed with legend indicated on wiring diagram.

b.

Wiring shall be continuous without splices from terminal to terminal.

Conduit

a.

Unless otherwise specified, conduit shall be rigid galvanized steel.

b.

If specified for corrosive environments, conduit and fittings shall be copper-free aluminum or coated with a factory-applied, chemically bonded PVC (40 mils, minimum).

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16 December 2005

10.6.


c.

Watertight, flexible metal conduit shall be used for connections to motors and to other electrical equipment subject to vibration or requiring a flexible connection for maintenance.

d.

Minimum conduit size shall be 19 mm (0.75 in), except that flexible conduit connections to instruments and other devices may be 13 mm (0.5 in).

e.

Conduit connections to enclosures without factory-threaded hubs shall be made with watertight threaded hubs. 1.

Conduit shall enter enclosures from bottom or sides.

2.

Horizontal conduit connections to enclosures shall be arranged for drainage away from enclosure to conduit low-point drain fitting.

3.

Conduit union shall be installed between conduit seal and enclosure.

Lighting Illumination levels shall be in accordance with IES Lighting Handbook.

10.7.

10.8.

Grounding a.

Grounding shall be in accordance with GP 12-25 and NFPA 70, Article 250.

b.

Two pads shall be welded to skid located at opposite corners of skid. Each pad shall have mechanical lug sized for Number 2/0 AWG conductor.

c.

Frames and enclosures of electrical components, motors, vessels, tanks, and structural parts shall be electrically bonded to skid. 1.

Conduit, cable shielding, and electrical enclosures shall be electrically bonded to provide continuous connection between respective items.

2.

Cable shielding for analog and other low voltage instrument cables shall be grounded only at main panel.

3.

Total resistance between any device on skid and skid frame shall not exceed 0,1 ohm.

Nameplates Electrical equipment, enclosures, and control stations shall be identified with nameplates. a.

Nameplates shall be stainless steel or laminated white / black / white phenolic engraved with a black legend.

b.

Nameplates shall be fastened with stainless steel screws.

11. Instrumentation 11.1.

General a.

Instrument system design shall comply with API RP 551 and 30 CFR, Part 250 for offshore service.

b.

Instruments of similar types shall be made by one manufacturer and part of a single model or design series. Installation materials shall be similarly standardized.

c.

Instrument ranges shall be selected such that normal operating range is between 35% and 75% of instrument’s full range.

d.

Indicating instruments shall be installed to place centerline of chart or indicator at approximately 114 mm (4.5 ft) above operator access level.

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16 December 2005

11.2.

11.3.

11.4.


e.

Inline-mounted instruments and control valves in critical service shall not be installed over 1330 mm (4 ft) above grade without access facilities.

f.

Instruments shall be: 1.

Installed level and plumb.

2.

Mounted on instrument supports.

3.

Installed to provide clearances for opening of instrument doors and enclosures and removal of covers and cases.

g.

Instruments shall not be mounted on handrails or supported by process equipment, piping, or instrument tubing. Pressure gauges or thermometers may be mounted on piping or equipment.

h.

Enclosures shall not interfere with operation of associated valves or nearby equipment nor obstruct observation of indicators.

i.

Instrument supports shall be constructed and installed to: 1.

Prevent water trapping.

2.

Allow for direct instrument removal.

3.

Prevent mechanical stress at instrument tubing connections.

4.

Provide space and mounting provisions for associated instrument accessories.

j.

Process indicators shall be installed adjacent to related transmitters.

k.

Local output signal indicators shall be provided for blind transmitters.

l.

Instruments used for shutdown functions shall have dedicated process connections.

Tagging a.

Each instrument shall be provided with an embossed stainless steel identification tag or engraving directly on the assembly.

b.

Tag shall be permanently attached using stainless steel screws, stainless steel bolts, or a stainless steel wire of minimum Number 20 AWG.

c.

Junction boxes, bulkhead plates, and blind enclosures shall have identification tags.

d.

Tubing runs and multi-tube bundles shall be tagged at each end.

e.

Tubing runs less than 3 m (10 ft) in length and traceable shall not require tagging.

Pneumatic instrumentation a.

Analog signals shall be 21 to103 kPa (3 to 15 psig), except 41 to 207 kPa (6 to 30 psig) may be used for valve actuators or controlled end-devices.

b.

Individual air filter-regulator set with liquid drain shall be installed upstream of each user.

c.

Pneumatic supply piping shall be NPS 1/2, minimum.

d.

Maximum of 5 users shall be placed on minimum size header pipe.

e.

Instruments with vent openings shall have bug-proof breather screens installed.

Electrical instrumentation a.

Analog signals shall be 4 to 20 milliamperes DC.

b.

If applicable, digital smart transmitters may be used if approval is obtained from Company.

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16 December 2005

c.

Two-wire system shall be used, unless equipment needed is not available in a two-wire configuration.

d.

If control panel is provided on skid, instrument wiring shields and control system grounds shall be connected to common instrument ground bus with one connection from bus to electrical ground system.

e.

Instrument signal wiring shall be:

f.

g.

11.5.

1.

Installed without splices.

2.

Continuously shielded with shield terminated individually on a terminal at termination or control panel.

3.

Routed in separate cable tray or conduit from electrical power wiring.

Thermocouple and RTD wiring shall be: 1.

Routed in separate cable tray or conduit from low-energy analog signal, flow meter pulse signal, or electrical power wiring.

2.

Connected directly from sensor terminals to readout instruments, transmitters, or package boundary junction boxes, without intermediate terminations or splices.

Electrical cable / conduit entrance to instruments shall be 12.7 mm (0.5 in) OD, minimum.

Pressure instruments a.

For vapor service above 65.5°C (150°F) or for steam service, pressure gauges shall have siphons.

b.

For vapor services above 148.8°C (300°F), siphons only shall be installed.

c.

If multiple instruments are connected to same process connection, block and bleed valves shall be installed for each instrument.

d.

If stream measured is subject to pulsation or vibration, pressure instruments shall have pulsation dampeners or snubbers on impulse lines.

e.

Pressure instruments shall be installed such that impulse line liquid head does not alter useful range of measurement.

f.

In process streams containing solids or viscous fluids, pressure taps or connections shall be located to minimize entry of sediments or blocking fluids into tap and have one of the following:

g.

h.

11.6.


1.

Liquid seals.

2.

Diaphragm seals.

3.

Periodic manual purging.

4.

Continuous purging.

Differential pressure instruments shall be: 1.

Installed using three-valve manifolds.

2.

Made of Type 316 stainless steel, unless stainless steel is not compatible with process fluid.

Integral mounted manifolds shall not be used.

Temperature instruments a.

Temperature sensors shall be installed such that effective sensing point is in middle 1/3 of pipe.

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16 December 2005

11.7.

b.

Filled thermal system capillary tubing shall be installed to provide physical support and mechanical protection between sensor bulb and measuring instrument.

c.

Excess length of capillary tubing shall be coiled and fastened to instrument stand or tubing support.

d.

Thermocouples shall be wired with compatible extension leadwire.

e.

RTD probes for insertion into thermowells shall have spring loaded tips.

Level instruments a.

b.

11.8.


Level instruments shall be installed directly on vessels or on gauge columns directly attached to vessel with no traps or pockets in interconnecting piping. 1.

Level instruments used for interface measurement shall be connected directly to vessel.

2.

Except for flanged instruments designed for flush mounting at vessel wall, block valves shall be installed between vessel and instruments.

Gauge columns (bridles that support multiple level instruments) shall: 1.

Be fabricated from Schedule 80 pipe, minimum, sized to structurally support device.

2.

Have equalizing lines, 38 mm (1.5 in), not common with other instruments.

3.

Have NPS 3/4 vent and drain connections.

4.

Be heat traced if fluid viscosity exceeds 200 centipoise at minimum ambient temperature or if contained liquid could freeze.

c.

Internal displacer / float level instruments shall have displacer / float installed in a perforated stilling well.

d.

Stilling well shall extend a minimum of 51 mm (2 in) above and 51 mm (2 in) below displacer.

e.

Use of internal displacers shall be minimized. Approval of internal displacers shall be obtained from Company.

f.

Level instruments providing critical service alarm, shutdown signals, or both shall be installed with separate connections from level control and process alarm devices.

g.

External cage level instruments and level gauges used on vertical vessels and gauge columns shall be installed with lower instrument connections at least 6 inches above bottom tangent line of vessel.

h.

Clearance for installation of drain valve and piping on bottom of level instrument shall be provided.

Flow instruments a.

Orifice plate flanges and fittings shall be installed to enable safe changing of orifice plates.

b.

Meter runs in liquid service shall be installed such that line upstream and downstream of meter remains full of liquid with sufficient head to prevent flashing across meter.

c.

Variable area flow meters, such as rotameters, shall be installed such that meters: 1.

Are plumb to within 1/2 degree of vertical.

2.

Have clearance for removal of rotameter float without removing body from line.

3.

Are vibration free.

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16 December 2005

11.9.

Control valves and regulators

11.10.

a.

Valve operators, pilots, positioners, or other accessories shall not be exposed to excessive heat from adjacent piping or equipment.

b.

Control valves shall be NPS 1, minimum, with flanged end connections and bolted bonnets. Approval of smaller sizes for special services shall be obtained from Company.

c.

Clearance shall be provided for removal of internals without removing valve or regulator body from line.

d.

Regulators with threaded connections shall be installed with unions or flanges.

e.

Block and bypass valves installed around control valves shall have bleed valve installed between upstream block valve and control valve.

f.

If block and bypass valves are not installed around control valves, control valves shall have handwheels.

Pressure relief devices a.

12. 12.1.


Pressure relief devices that discharge: 1.

Vapor or gas containing hydrocarbons or other hazardous gases shall be piped to a common relieving system.

2.

Liquids containing hydrocarbons or other material that must be contained shall be piped to a common closed-drain system.

b.

If block valves are installed upstream or downstream of pressure relieving device, valve shall have lock-open device. Discharge piping shall not be smaller than relief valve body outlet.

c.

If block valves are installed upstream of pressure relieving devices:

d.

Block valves shall have a port greater than or equal to inlet port of relief valve.

e.

Test inserts shall be installed between block valve and relief valve inlet.

f.

Pressure relief valves shall be installed such that each valve may be maintained from grade or from platform.

g.

Rupture discs installed in series with pressure relief valves shall have rupture detection assembly consisting of pressure gauge and excess-flow check valve.

h.

Relieving scenarios and sizing calculations shall be provided for pressure relief devices.

Inspection and testing General a.

Notice of the equipment's readiness for inspection and/or testing shall be given at least three working days prior to the start of any of the following phases of fabrication: 1.

Fabricating piping phase: a)

Notice is required when fabrication begins.

b)

Notice is required when 50 percent of welding is complete.

c)

Notice is required when welding is complete but before assembly, except when assembly of unit will allow convenient 100 percent radiography weld inspection, both internally and externally.

2.

Assembly phase: notice is required when assembly is complete.

3.

Hydrostatic testing phase: notice is required when ready for hydrostatic testing.

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16 December 2005


4.

12.2.

b.

The interior surfaces of all components shall be thoroughly cleaned. Slag from welding and cutting, weld flux, steel, dust, water and other debris shall be removed.

c.

After cleaning, all openings shall be immediately covered to prevent foreign matter and debris from re-entering the components.

d.

Check general appearance, workmanship and operability, such as correct height of push button stations.

e.

Check safety hazards such as conduit run above grating (tripping), burrs on structural steel or handrails.

f.

The following outlines, but does not limit, the scope of intended inspection, the requisite duties of the fabricator and condition of components to enable the inspection at various phases to be performed.

Fabricated piping inspection a.

b.

12.3.

12.4.

Preparation for shipment phase: notice is required when partially dismantled and properly prepared for shipment.

When fabrication begins: 1.

Review welding procedures and welding performance qualifications.

2.

Check materials.

3.

Check wall thickness.

When 50 percent of welding is complete: 1.

Visual: internal and external

2.

Radiograph: random or 100 percent as specified in the purchase order

c.

When welding is complete: same as item b. for remaining work.

d.

Piping conforms to project requirements.

Assembly inspection a.

The assembly shall be complete with the exception of covers that would require removal for inspection of circuitry. Terminal boxes and vessel manways are two examples of devices that shall be left open.

b.

The fabricator shall provide electrical power as required and an instrument air test harness, if required. The air test harness assembly shall consist of two needle valves, a bleed valve, a pressure gauge and a regulator. This assembly applies a simulated pressure signal to a device.

c.

Dimensional checks shall be made on all interconnecting piping components for tolerance compliance and dimensions as shown on the drawings.

Structural inspection a.

Check members compliance with specifications and drawings.

b.

Welded quality: buttwelded joints in main beams shall be examined by magnetic particle or other approved NDT methods at the discretion of the inspector.

c.

Check that compartment drains are adequate.

d.

Check that piping and equipment supports are complete and ready for shipment.

e.

Check lifting lugs, slings and clamps. Lifting lug welds and spreader bar welds shall have 100 percent NDT of an approved type. All lifting devices shall have valid test certificates available for inspection.

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16 December 2005

12.5.

12.6.

12.7.

12.8.

12.9.


Instrumentation inspection a.

Check for compliance with specifications.

b.

Check hookup according to instrument drawings and specifications.

c.

Check for proper support of valves, instruments, air lines, etc.

d.

Stroke valves and simulate operation. Test in accordance with project specifications.

Electrical inspection a.

Verify that component quantities and description are compatible with requirements.

b.

Test in accordance with project specifications for the following items. 1.

Perform point-to-point continuity test.

2.

Check all equipment for proper voltage, phase and frequency.

3.

Perform manual operation of all mechanical linkage for proper alignment.

4.

Energize all equipment, run motors with couplings disconnected and perform operational tests by causing relays, solenoids, etc. to function by simulation of control action to test integrity of circuit.

5.

Perform high voltage test for conductors (including insulation where appropriate) and/or equipment involved.

6.

In cases involving explosion-proof equipment, fabricator shall not pour seals until inspection is completed.

7.

Verify that grounding points are installed properly.

Painting inspection a.

Verify paint is in accordance with job specifications.

b.

Check general appearance.

c.

Verify that paint has been removed, if necessary, from all control valve stems and other machined surfaces, instrument glass, nameplates, flange faces and other items that are not supposed to be painted.

Hydrostatic or pneumatic testing a.

Hydrostatic testing is not required for individual sections of fabricated piping unless specified.

b.

Piping on assembled skid units shall be pressure tested in accordance with ASME B31.3.

c.

Test fluid shall contain sufficient ethylene glycol for protection if there is a possibility of exposure to freezing temperatures after assembly and in transit to the job site.

d.

An approved corrosion inhibitor shall be applied to the internal surfaces of all skid components.

e.

Hydrostatic or pneumatic testing shall be performed prior to painting and/or application of insulation.

Insulation inspection a.

Check proper materials and thicknesses.

b.

Check banding, caulking and general workmanship.

Page 25 of 28

16 December 2005

12.10.


Certifications The following items shall be verified and certified in writing:

13. 13.1.

a.

Vessel code certification forms

b.

All hydrotest charts

c.

All material certifications

d.

All welder qualifications

e.

All welding NDT

f.

All electrical code certifications

g.

Structural design certification, if required

h.

Lifting devices certification and test lift certification, if required

i.

Cleanness of interior surfaces of all components

Preparation for shipment General a.

Equipment, piping, electrical, instrumentation and other components shall be securely anchored to the skid to prevent damage during shipment. Shipping supports, tie-downs and temporary welding shall be marked and noted for removal.

b.

Instruments to be removed, as required by other relevant specifications, shall be tagged and crated in waterproof boxes constructed from 5 cm (2 in) lumber.

c.

13.2.

13.3.

1.

Instruments shall be packed with sufficient desiccant for protection in transit and during storage at job site.

2.

Boxes shall be securely attached to the skid for shipment.

Any equipment extending beyond the skid edge shall be removed, tagged and crated in waterproof boxes constructed from 5 cm (2 in) lumber. Boxes shall be securely attached to the skid for shipment.

Partially dismantled and properly prepared export shipment a.

Check Bill of Material or packing list against all back-ordered and/or boxed items.

b.

Verify proper removal, packaging and safe storage of dismantled components.

c.

Check for proper material preservation.

Openings protection a.

b.

All openings, flange faces, threaded connections, valve stems and other component parts subject to mechanical damage or corrosion shall be adequately protected. Such protection shall consist of, but not be limited to: 1.

Bolted wood or plastic flange covers

2.

Sealing with waterproof tape

3.

Enclosing with temporary metal housings

4.

Coating all machined and threaded surfaces with a rust preventative

5.

Protective covers on lubrication fittings

This protection shall be applied to all components: those removed and boxed and those remaining in place on the skid assembly.

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16 December 2005

13.4.


Skid preparation a.

All piping and handrails removed for shipment shall be properly tagged and secured to the skid from which it was removed.

b.

A lifting sling assembly, including spreader bar, if required, for a minimum four-point pickup, shall be furnished with each skid.

c.

The completed skid, after being prepared for shipment, shall be test lifted to ensure a balanced and level lift and structural integrity. Measure deflection of skid to ensure no damage to equipment.

d.

The skid shall be securely fastened to the barge ship or other means of transport at the designated tie down points.

14. Documentation a.

Data, drawings and welding procedures shall be submitted in accordance with purchase order specifications.

b.

Inspection, material certifications and test reports (certified as necessary) shall be submitted prior to shipment.

c.

A certified structural design report shall be submitted prior to shipment.

Page 27 of 28

16 December 2005


Figure 1 – Skid end design

Page 28 of 28

Guidance on Industry Standard for Skid Mounted Units

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