Fabrication Sequence.pdf

Presented byPresented byMr. Therasap RattanapatMr. Therasap Rattanapat

FABRICATION OF OFFSHORE PLATFORM

Platform Configuration In ThailandPlatform Configuration In Thailand

JacketJacket : •The 4-legged Jacket•Conventional-bracing jacket comprises of •elevated panels with batter in both directions•6-20 Drill Slot•Water Depth : 70-80m. Approximately•Equipped with Boat-landing and Riser•4 Piles•Installation by Crane Lifting / Upending•Flooding Syatem is required for Free Floating of JK in the Sea before Upending

Platform Configuration In ThailandPlatform Configuration In Thailand

TopsideTopside : the integrated 4-column structure comprises of several Elevation deck panels ie;•Drain Deck Panel•Lower Deck Panel•Upper Deck Panel•He-li Deck•Vent Boom / Flare Boom•Crane Platform•Piping, Mechanical•Electrical and Instrument•Safety Equipment•Installation by Single Lift using of Derrick Crane Barge

Welding ProcessWelding Process

Structural Welding Structural Welding ProcessProcess

•SMAW•SAW•FCAW – Gas Shield•FCAW – Self Shield•TIG

Control of Welding QualityControl of Welding Quality

WPSWPS

•All welding shall be followed the approved Welding Procedure Specification (WPS)


WPQTWPQT

•Relating to the specific WPS, The welding procedure qualification test (WPQT) is also required in order to proved that the WPS to be used is qualified in the strength, quality point of view.

•The base metal, consumable and other parameters ie pre-heating and temperature to be used / control in the WPQT shall be comply or equivalent to the actual used of fabrication.


PQRPQR

•During the test, all necessary parameter shall be recorded in the PQR (Procedure Qualification Record) format.

•After Completed the testing, visual inspection in according to ASME or AWS D1.1 shall be done, whichever is applicable, then followed by NDE (24Hr for Mild steel, 48hr for High Strength Steel).

•The completed welded testing specimen shall be sent to the qualified laboratory for mechanical testing, which will be consist of Tensile Test, bend test, Impact Test, hardness test for each heat effect zone.

Example of WPS, WPQT, PQRExample of WPS, WPQT, PQR

Example of WPS, WPQT, PQRExample of WPS, WPQT, PQR

Welder Qualification TestWelder Qualification Test

Welder Qualification Test (WQT)Welder Qualification Test (WQT)

•All welder shall be qualified before allow to assigned to the project.

•The qualification of welder shall be done at the same requirement specified in the WPS.

•The completed test specimen shall be visual inspection and follow by NDE as below- 100% RT for all butt joing that is qualified for 6GR, 6G,

3G/4G, 1G- 100% UT for 6GR and SAW-1G- MPI for Fillet Welded- Macro for acute angle

Example of WQTExample of WQT

Welding ExaminationWelding Examination

•All welding shall be 100% visual inspection after completion of welding before release for NDE and painting.

•NDE shall not be carried out until 24Hr for Mild steel and 48hr for high strength steel.

Welding ExaminationWelding Examination

Material ControlMaterial Control

All Materials shall be control throughout each stage of fabrication to ensure the following.

•All material shall be checked during receiving stage to ensure that they’re traceable to mill certificate

•After receiving of material, all material shall be numbering anf containing to heat number and piece number from manufacture.

•All structural member shall be full traceability by hard stamp during material marking (material verification) before material cutting process.

Corrosion ProtectionCorrosion Protection

2 Process are normally be selected to protect the structure from the corrosion.-Catholic Protection, Anode-Coating (Painting)

-Normally the structure which located under splash zone will be protect from corrosion by using of Anode.

-The structure located at and above splash zone will be protect from corrosion by using of coating / paint process.

-The painting system and designed of Anode shall be complied with the designed lift of platform 9ie. 20Years or other life.

Fabrication Yard Layout PlanFabrication Yard Layout Plan

Fabrication Yard Layout Plan (Pre-Fabrication)

Fabrication Yard Layout PlanFabrication Yard Layout Plan

Fabrication Yard Layout Plan (Final Space Assembly)

Fabrication / Loadout Support PlanFabrication / Loadout Support Plan

Jacket Fabrication and Loadout Support Plan

Fabrication / Loadout Support PlanFabrication / Loadout Support Plan

Topside Fabrication and Loadout Support Plan

Fabrication Sequence for JacketFabrication Sequence for Jacket

Jacket Fabrication Flow Chart


Jacket Elevation Panel Pre-Fabrication (TYP)


Jacket General Fabrication Sequence













Fabrication Sequence for TopsideFabrication Sequence for Topside

Deck Fabrication Flow Chart

Fabrication Sequence for TopsideFabrication Sequence for Topside

Deck Panel Pre-Fabrication

Fabrication Sequence for TopsideFabrication Sequence for TopsideDeck General Fabrication Sequence








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Fabrication Sequence.pdf