Apparatus for internally coating live gas pipe joints or...

F - Mech Eng,Light,Heat,Weapons – 16 – L

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F16L 55/162 (2006.01) F16L 55/1645 (2006.01) F16L 55/46 (2006.01)

Patent

CA 2325449

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.

Pour rendre étanches les joints et autres discontinuités à l'intérieur des tubes de gaz sous pression, on pulvérise sur ces joints ou discontinuités un matériau de chemisage au moyen d'une taupe de chemisage (10) traitée antidéflagrante et capable de parcourir des longueurs de tube (14). Cette taupe de chemisage, qui est introduite dans le tube, utilise une caméra traitée antidéflagrante (44) pour localiser les joints et autres discontinuités dans le tube. Le matériau de chemisage préférée est un polyuréthanne élastomère de type époxy (48) à pouvoir garnissant élevé qui durcit rapidement en présence des gaz circulants pressurisés. Un même regard suffit pour traiter plusieurs joints ou discontinuités sur plusieurs centaines de pieds de long.

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