Pipe joints or couplings – With casing – lining or protector – Lined
Patent
1993-07-20
1995-02-14
Nicholson, Eric K.
Pipe joints or couplings
With casing, lining or protector
Lined
285286, 285149, 228214, F16L 5806, F16L 1302
Patent
active
053888634
ABSTRACT:
This invention is a method for joining sections of in-situ cement-mortar lined pipes adapted for high pressure water injection service. The method utilizes a backing ring with one beveled end inserted into a beveled end of the first pipe section and the other beveled end of the backing ring projecting from the first section and adapted to mate with a beveled end of the second pipe section. The pipe sections are then cement-mortar lined. The ends of the linings are then cut back and beveled to facilitate alignment and fit-up, and to provide a cavity and anchor for the retention of a heat expanding grout that is applied to both ends of the lined mating pipe sections to seal the joint. A root opening is left between the mated ends to permit weld penetration and fusion of the butted ends of the steel pipe and a space for the excess and expanding grout to protrude internally. The finished joint is strengthened by the backing ring which also facilitates the formation of a uniform butt weld and a cement lining that is free of voids or channels where the linings are joined.
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Nicholson Eric K.
Saudi Arabian Oil Company
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