Subsea isolation techniques advance

Two recent subsea pipeline isolations illustrate the advances made in isolation technology and methods. One isolation was for repair of the line itself, the other for replacement of motor-operated ball valves. This article examines each.MalaysiaTDW Offshore Services AS in December 2009 completed a pipeline pressure isolation operation in Malaysia with Amserve Engineering on behalf of Malaysia LNG Sdn Bhd, a subsidiary of Petronas, the national oil company of Malaysia.The operation occurred at the Petronas LNG complex in Bintulu, Sarawak. Natural gas moves from platforms in the South China Sea through four major trunklines to the onshore processing plant. Trunkline 4 (36-in. OD) required p...

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