Apparatus and method for internally coating live gas pipe joints

Coating apparatus – With indicating – testing – inspecting – or measuring means

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Details

118254, 118306, 118408, 118670, 427236, B05C 1100

Patent

active

059139773

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-proof coating device, capable of traversing long lengths of pipe. The coating device is inserted into the pipe and uses a halogen lit explosion-proof camera for locating joints or other discontinuities in the pipe. The preferred coating material is a high build epoxy-type elastomeric polyurethane, 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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patent: 5156886 (1992-10-01), Kitson

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