Patent ID: 6038725
Filing Date: 2000-03-21
Classification: B08B

Abstract:
A single-piece, unitary cast, bidirectionally moveable paraffin scraping pig for use in a pipeline and comprising an elongate central body having a leading end and an opposite trailing end with a middle portion between said ends and said body is capable of flexing at least 15.degree. and supports a leading end disc and at least two intermediate discs on said body, wherein at least one intermediate disc is near to the leading end disc, and at least one intermediate disc is near the trailing end of said body, wherein the middle portion of said elongate body is free to flex up to at least 15.degree., and said discs adjacent to said middle portion have a faired root joined to said body and wherein the outside diameter of said leading disc ranges from about 96% to 98% of the outside diameter of said intermediate discs and wherein the pipeline has an inside diameter and said leading disc outside diameter is at least about 102% of the inside diameter of the pipeline.