Pipeline remediation method with wire rope pig

摘要

A method of remediating deposits within a pipeline by a pig within the pipeline which sealingly engages the internal diameter of the pipeline, holding back on the movement of the pig with a wire rope, pumping down the pipeline, providing a first passageway through the pig for pumping through flow restrictions on the pig to increase the velocity of the flow to enhance the effectiveness of the remediation, providing a second passageway through the pig with less flow restriction than the first passageway for flow through the pig during retrieval, and providing a selector valve for alternately directing flow through the pig to the first passageway and to the second passageway each time the flow is stopped and restarted.