A Short Brief About Offshore Pipeline Installation Engineering

1 | Strength and Depth

a short brief about

Offshore Pipeline Installation Engineering

August 30, 2010

Vladimir Medio SentosaOffshore Pipeline Engineer (Installation)SapuraAcergy Sdn. Bhd.

2 | Strength and Depth

Offshore pipeline / installation engineering?

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Pipeline?

Platform PlatformPipeline

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Pipeline?

FPS OnshorePipeline

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Main Equipment

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• Conventional laybarge:

• Using mooring to keep position

• Coverage area up to WD 50-100m

• Modern laybarge:

• Using DP (dynamic positioning) to keep position

• Coverage area more than WD 50m

7 | Strength and Depth

Process Overview

• Start-Up / Initiation

• Loading and storage

• Firing Line– Welding– NDT– Field joint coating

• Tensioning

• Laydown• Emergency

– Abandonment and Recovery

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Installation Analysis

• Installation analysis:– Start up, normal laying, A/R analysis, laydown– Local buckling check– Fatigue analysis– Free span / bottom roughness

• Based on DNV OS F101– Section 12 K300, Simplified laying criteria– Area: Overbend and Segbend– Check: Stress and Strain

• Result of analysis is exceed the criteria?– Environmental loads: Hs, T, current– Optimizations: roller setting (barge/stinger), tension, trim, stinger – Others: buoyancy tank

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S-Lay Method

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OFFPIPE Software

• Static analysis:– Start up, A/R analysis, laydown, free span / bottom roughness

• Dynamic analysis– Normal laying: RAO, environment condition

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Output OFFPIPE

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13 | Strength and Depth

Thank you!

Vladimir Medio SentosaOffshore Pipeline Engineer (Installation)vladimir.sentosa@sapuraacergy.com Desk : +60386572961Mobile: +60173531041

Alternatively:vladimir.medio@yahoo.comwww.vladvamphire.wordpress.com