Pig and method for cleaning tubes
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United States of America Patent
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-
May 27, 2003
Grant Date -
Dec 6, 2001
app pub date -
Sep 24, 1998
filing date -
Sep 24, 1998
priority date (Note) -
In Force
status (Latency Note)
Importance
Abstract
A method of cleaning tubing in an operating heater, in which the tubing has an inlet and an outlet. While the heater is in operation, a hollow, metallic and/or tubular mesh pig is run through the tubing from the inlet to the outlet. Cleaning should be done before contaminant has hardened. An improved pipe pig, preferably hollow, metallic and/or made from tubular mesh, has scraping edges made from longitudinal edges of a wire. The tubular mesh may be a knit, weave or may be knotted. The pig is preferably radially expandable up to twice its fully compressed radius, and may have an expander to force it radially outward. The pipe pig is preferably made of a resilient wire having a polygonal cross-section.
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