SPECIAL REPORT: Advanced isolation technology allows subsea valve replacement without purge

05/02/2011
Gerald MisajonShell Philippines Exploration & ProductionMakati City, PhilippinesRolf Gunnar LieT.D. Williamson Asia Pacific Pty. Ltd.SingaporeAdvanced pipeline-pressure isolation technology allowed Shell Philippines Exploration & Production to replace an export riser shutdown valve at an offshore natural gas production platform without the time and expense of depressurizing and purging the entire export pipeline.Shell faced three alternatives apart from the technology it ended up using.The company could live with a defective emergency shutdown valve (ESDV) at the platform. This choice would effectively rule out proper boundary isolation for shutdown purposes or isolation of the ex...
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