HSTD-PTSCMC-TS-Q-PR-0001 Dimension Control Procedure for TOPSIDE Fabrication

THANG LONG JOINT OPERATING COMPANY HAI SU TRANG FULL FIELD AND HAI SU DEN EARLY PRODUCTION SYSTEM DEVELOPMENT PROJECT CONTRACTOR: PTSC MECHANICAL & CONSTRUCTION

DIMENSIONAL CONTROL PROCEDURE FOR TOPSIDE AND DRILLING DECK FABRICATION EPCI CONTR

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THANG LONG JOINT OPERATING COMPANY HAI SU TRANG DEN PROJECT EPCI OF HAI SU TRANG, HAI SU DEN AND PIPELINES Document No : HSTD-PTSCMC-TSQ-PR-0001.

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DIMENSIONAL CONTROL PROCEDURE FOR TOPSIDE AND DRILLING DECK FABRICATION.

Page 2 of 18 Date: 17-Apr-2012

REVISION RECORD SHEET No.

Rev. No.

Content of revision

Date of Revision

1

A

Issued for review

04-Apr-2012.

2

0

Issued for construction

17-Apr-2012

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TABLE OF CONTENTS TABLE OF CONTENTS SECTION

DESCRIPTION

PAGE

1.0

PURPOSE

5

2.0

SCOPE

5

3.0

REFERENCE

5

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PURPOSE

This procedure outline the methods of dimensional control survey to ensure specified dimensional requirements are met in the final fabricated Drilling deck & Topside structures and appurtenances. 2.0

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SCOPE

This procedure is applicable to the following actions: Material dimensional inspection on receipt. Assembly of Drilling deck & Topside and related component items (include: Main legs, deck-legs, Elevation difference among platforms, conductor guide positions, crane pedestal bearing surface, deck levelness). Final dimensional check the Drilling deck & Topside and Load-out.

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5.0 PROCEDURE 5.1 RESPONSIBILITIES Foreman

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Shall be responsible for overall aspects of shift working which includes quality, health and safety.

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Make recommendation to conduct improvement activities to i mprove productivity and quality.

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To be responsibility of production team to liaise with DCS ensuring adequate notice is given to allow surveys to be performed which meet the obligations of this procedure.

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Ensuring that the quality system meets requirements established in this specification.

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Ensuring all reports are correct and acceptably good for TLJOC’s QC acceptance/approved.

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Reviewing and approve all Dimensional reports.

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Monitor/Coordinate quality activities with production team.

5.2

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EQUIPMENT( Reference to Appendix I).

The Dimensional Control Surveyor will be equiped with a suitable supply of survey

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Initial observations around the network will be distilled to produce accurate coordinates for each station, and during the life of the project the network will be rigorously monitored to maintain this accuracy.

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Temporary control stations, in times of peak fabrication activity, may be required to be established and these will be related to the main control network through conventional survey techniques such as triangulation, trilateration, braced quad, intersection, resection, bearing and distance etc.

5.4 SETTLEMENT MONITORING.

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Prior to Lift of the Topside frames, a series of temporary Benchmarks( TBM’s) will be established at convenient location around Drilling deck & Topside erection area. The height of these TBM’s will be obtained using Level model AX 2S from permanent

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The work point to work point survey shall be accomplished by measuring the intermediate dimensions (Elevation), overall lengths and squareness survey (cross dimensional) that have been specified in the approval for construction drawing utilising measuring tape. 5. Survey of level: The level survey shall be applied to the levelness or flatness of the assemblies i.e. jacket braces and etc, with two ends at zeroed and reading at every 3m interval ulilising dumpy level. 5.6 DRILLING DECK &TOPSIDE FABRICATION. 5.6.1 CRITICAL ELEMENTS

The following items have been identified as critical elements in terms dimensional control and will require having particular emphases applied in order to achieve minimum

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a. Engineering Department shall prepare shop drawing, cutting sheet for every beam. Dimensional Control Surveyor shall conduct 100% dimensional check on beams based on approved shop drawing. b Dimensional surveys should demonstrate correct beam depth, flange width, web verticality, flange rotation, web to flange eccentricity, beam straightness in two planes and length of beams. c

If beam is splice in 2 sections, a fit up survey should check the straightness, reading at 3m intervals and either side of the splice. Both camber and transverse deviations should be noted.

5.6.4 SUB-CELLAR DECK, CELLAR DECK, DRILLING DECK, MEZZANINE

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b As such pre-weld and post-weld survey check shall be conducted to ensure that the position deviations of the cone receiving cans are minimized. Weld shrinkage effects should be anticipated by increasing fit up distances center to center.

5.6.6 CELLAR DECK ASSEMBLY a The pre- assembly of the cellar deck transverse primary beam East/West in between leg can to leg can and the cantilever beam will be post weld surveyed for erection. The leg will be stabbed in to the transportation frame buckets, set at correct theoretical leg spacing. b Check on the leg cans to conform the verticality and the levelness of the cellar deck. As the intention is to erect the main deck with the short section of legs, this will ensure the properfit-up of leg splices during the erection.

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d The position of any free ends expected to accept cantilever/wing pallets will also be surveyed. e As the deck is loaded up the supports should be monitored for settlement and corrective action taken if the settlement exceeds an agreed limit ±6 mm.

5.6.8 INTER DECK BRACING a The brace between the cellar deck and main deck will be installed after the cellar deck erection and weld out and as equipment permits. b Deck bracings are pre profiled and fit up checks shall include verticality and brace landing surveys.

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a Other miscellaneous structural sub assemblies such as crane boom rest, mud splash walls, emergency shelter wall, lift pad eyes etc... Should be surveyed on an as-required basis. b Pipe support, piping vessel and equipment seating should be surveyed on an as requested basis. 5.6.12 LOAD-OUTS a Load out operation shall be considered as having critical dimension input in term of monitoring barge ballast, monitoring lift off and set down operations and hard marking layout match lines. b Transverse and lateral derrick barge and transport barge movement shall also be monitored during load-out, particularly critical for skidded load-out operations. c Pipe support, piping vessel and equipment seating should be surveyed on an as requested basis.

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- All original reports will be kept in QA/QC department and will be available for TL JOC at any time. A copy of fit up surveys will be passed to production as evidence of compliance with the project specification. - The final as built dimensional report of steel structural part and components shall be generated and signed by TL JOC representative. - All original Dimensional Control Reports shall be filed in QAQC Department and the QA Engineer shall be responsible for these documents. All dimensional control reports shall be submitted to TL JOC for verification. List of asbuilt dimensional control Inspection reports as follows:

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APPENDICES APPENDIX I LIST OF DIMENSIONAL CONTROL EQUIPMENTS

No.

Type of Equipments

Serial no.

Purpose

01

Total Station Leica TS09-power 1’’

1315978

All dimension checking

02

Total Station Leica TS09-Power 1’’

1300805

All dimension checking To ensure angle,

Remarks

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TOLERANCES Sources: 1. Structural Welding and Fabrication Specification. 2. API-RP2A-WSD-Section 11.1.5. 3. API spec 2B: Specification for the fabrication of structural steel pipe. 4. AWS D1.1(2008). Section 5.23: Dimensional tolerance of welded structural members. 5. EEMUA 158(2005) Construction Specification for Fixed Offshore Structures in the North Sea. APPENDIX II: TABLE OF DIMENSIONAL TOLERANCES

NO.

DESCRIPTION

Top of the jacket and the bottom of the deck

DIMENSIONAL TOLERANCE

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(refer to Section 6.4.1-EEMUA 158).

9

10

Walkways, stairways and landings shall be positioned within the tolerance in relation to the theoretical position (refer to Section 6.4.2EEMUA 158). Deck plating level Plate or grating joints shall be flat without visible warping Padeyes, padears and lifting trunnions location and final orientation, work points shall be located within the design radius sphere. (refer to Section 6.3.4-EEMUA 158).

± 12mm in elevation. 6mm in any 3m length. 12mm in horizontal position.

The best-fit cente line for conductor guides of

10mm.

6mm in 3m. Mismatch >2mm grating joints shall be ground out and recoated. ± 0.5° of final orientation. 15mm error on radius sphere.

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Abbreviation:

tn :

Nominal wall thickness

Dn :

Nominal external diameter

Cn :

Nominal circumference

OD:

Outer diameter

∆c

Circumference tolerance

:


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APPENDIX III: DIMENSIONAL CONTROL INSPECTION REPORT.

HSTD-PTSCMC-TS-Q-PR-0001 Dimension Control Procedure for TOPSIDE Fabrication

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