Pressure isolation facilitates onshore, offshore maintenance

Pressure isolation and hot tapping, traditionally used for repair, play an increasingly important role in the maintenance and expansion of both offshore and onshore natural gas pipeline systems. An agreement between TDW Offshore Services AS and Amserve Engineering to service Sarawak Shell Berhad's Malaysian pipeline assets serves as one example of this development.BackgroundPipeline pressure isolation typically occurs in conjunction with valve change-outs on export lines in the event of leakage. Offshore isolations of valves with a 24-38 in. bore typically require a four-man crew to launch, monitor, and retrieve a tool such as TDW's SmartPlug. Operations take 2-4 weeks depending on circum...

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