Pipeline Service Pig with Floating Seal Carriers

摘要

A pipeline pig for performing service operations in a pipeline having a pig body, guides on the pig body which are adapted to slide along the bore of the pipeline, one or more seals which are each a composite of a metal seal carrier and a resilient sealing cup which are adapted to sealingly engage the bore of the pipeline and the metal seal carriers are adapted to sealingly engage the pig body and have radial freedom relative to the pig body such that when the pig body moves to an eccentric position relative to the pipeline such that the guides engage the bore of the pipeline bore the one or more seals are free to remain substantially concentric with the bore of the pipeline.

主权项

1. A pipeline pig for performing service operations in a pipeline comprising:
a pig body, guides on said pig body which are adapted to slide along the bore of said pipeline, one or more seals which are each a composite of a metal seal carrier and a resilient sealing cup, said resilient sealing cups are adapted to sealingly engage said bore of said pipeline and said metal seal carriers are adapted to sealingly engage said pig body and have radial freedom relative to said pig body such that when said pig body moves to an eccentric position relative to said pipeline such that said guides engage the bore of said pipeline bore said one or more seals are free to remain substantially concentric with said bore of said pipeline.