| 摘要 |
This invention provides a pig adapted for cleaning material from the inner wall of a pipeline and for assisting in the removal of this material from the pipeline. The pig comprises a cylindrical, open cell foam core. An impervious jacket covers the outer wall of the core. An opening in at least one end wall allows the pressurized fluid inside the pipeline to permeate the core. An abrasive means completely covers the outer cylindrical surface of the jacket. The abrasive means preferably is a layer of hardened steel bristles attached to a web backing. The tips of the steel bristles are bent in a longitudinal plane in the direction of travel of the pig.
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