What are the methods for repair of High Pressure Natural Gas / LPG Pipeline in operating condition, their selection criteria and comparison w.r.t safety and integrity?
Gautam Chakravarty, CGM (Gas-O&M), GAIL(Expert) - 15-Apr,2019 15:03
Cutting out a cylindrical piece of pipe having damage / defect and replacing it with equivalent grade and thick pre tested pipe section is the preferred repair option. In case online repair is necessary, installing clamp-on / bolt-on leak clamps is a temporary measure and welding of Type A or Type B sleeve are considered permanent repair based on type of defect to be addressed. Strengthening by composite sleeves is also acceptable in certain cases.
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