Pipes and tubular conduits – Repairing – Patches
Patent
1992-05-04
1993-04-06
Stodola, Daniel P.
Pipes and tubular conduits
Repairing
Patches
264 36, 277211, 277215, 285 16, 285286, F16L 5516, B65D 5304, F16J 1506
Patent
active
051994640
ABSTRACT:
The assembly comprises a pair of semi-circular steel shells. The inner surface of one shell forms a centrally located, circular recess and a concentric groove positioned between the recess and the side edges of the shell. A flat cylindrical annular seal element is seated in and fills the recess. The element is resilient and deformable. It has concentric protruding ribs on its top and bottom surfaces. The seal element is adapted to circumscribe a leaking small hole or crack in the wall of an internally pressurized pipeline. The shells are then circumferentially clamped against the pipeline to cause the element to seal around the leak and to effect tight shell-on-pipe contact. The steel side wall of the recess confines the compressed seal element. The side edges of the shell are then welded together longitudinally and circumferentially to create a permanent pressure vessel sealing and containing the leak. The concentric groove acts as a heat sink to impede the transfer of heat from welding through the shell wall toward the seal element.
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Battista, Jr. William G.
Interprovincial Pipe Line, Inc.
Stodola Daniel P.
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