Method and apparatus for inserting and propelling a coating device into and through live gas pipeline
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United States of America Patent
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Feb 4, 2003
Issued Date -
N/A
app pub date -
Jun 22, 1999
filing date -
Mar 25, 1998
priority date (Note) -
Expired
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Abstract
Joints or other discontinuities in live gas pipelines are sealed by spraying the joint or discontinuity with a coating material by means of an explosion-resistant coating device (10), capable of traversing long lengths of pipe (14). The coating device is inserted into the pipe and uses an explosion-resistant camera (44) for locating joints or other discontinuities in the pipe. The preferred coating material is a high build epoxy-type elastomeric polyurethane (48), which quickly cures in the presence of pressurized flowing gas. Several joints or discontinuities, spanning several hundred feet of pipe, may be coated using a single excavation.
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