VARIABLE SPEED PIG FOR PIPELINE APPLICATIONS

摘要

A variable speed pig (10) for movement within a pipeline having a plurality of venturi-shaped through passages (34) extending longitudinally to permit fluid within the pipeline to bypass the pig (10). The size and shape of these passages (34) may be varied to vary fluid pressure drop through the passages (34) and the pig (10) to correspondingly vary the speed of the pig (10) passing through the pipeline.