The paper will discuss scenarios and methods to isolate gas pipelines to retrofit subsea valves close to platforms.

The methods discussed represent the conclusions of some of the development work to date by Shell Expro under contract with a variety of contractors over a period of two years.

Keywords:
platform, freeze plug, isolation system, application, pipeline pigging, operational safety, differential pressure, procedure, secondary barrier, plug
Subjects:
Pipelines, Flowlines and Risers, Facilities Operations, Safety, Pipeline pigging, Operational safety
Copyright 1991, Society of Petroleum Engineers
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