Process for lining high pressure pipeline

Details Process for lining high pressure pipeline Process for lining high pressure pipeline

B - Operations, Transporting

29

C

18/965

B29C 63/34 (2006.01) B29C 49/26 (2006.01)

Patent

CA 1084224

PROCESS FOR LINING HIGH PRESSURE PIPELINE A B S T R A C T A method for lining a high pressure pipeline with a tubular plastic liner. After de-pressurizing, purging and cleaning, the pipeline is broken into discrete sections. A close-fitting liner segment is pulled into each pipeline section. Advantageously, the liner segments are fixed inside the pipeline sections to prevent longitudinal movement of the liner segments. Bleeder holes are provided through the pipeline walls at opposed ends of each pipeline section. The lined pipeline sections are reconnected to reform the pipeline, and then a relatively warm, pressurized fluid is pumped through the pipeline to radially expand each liner segment against the inner walls of the pipeline, thus evacuating the spaces between liner segments and pipeline sections by forcing air, water and other impurities through the bleeder holes.

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