Patent ID: 6014789
Filing Date: 2000-01-18
Classification: B08B,F28G

Abstract:
A pig for cleaning heat exchanger tubes formed of thin wall tubes subject to coating on the inside wherein the coating over time becomes harder to the range of at least about 4 mohs, a heat exchanger tube cleaning pig comprising:(a) front and back end pieces supported on a lengthwise mandrel, wherein said front and back end pieces each comprises cylindrical section and a conic section;(b) a dimensionally stable interchangeable disk between the end pieces of the pig, wherein truncated ends of said conic sections of said front and back pieces face in opposite directions and away from said disk; and(c) a plurality of precisely positioned mounting studs on said disk wherein each of said studs has an outer end and said outer ends collectively define a concentric radial edge about the centerline axis of the pig precisely located for cleaning the deposits in the tube.