Pipes and tubular conduits – With closures and plugs – Inflation stem type
Patent
1990-07-09
1993-02-16
Bryant, III, James E.
Pipes and tubular conduits
With closures and plugs
Inflation stem type
138 97, 228119, F16L 5504
Patent
active
051862140
ABSTRACT:
The plug is formed of fibrous material held together by a wax binder in the form of a cylindrical body. The body is adapted to fit closely into the bore of an open-ended pipeline. The body has a reduced diameter inner end portion. A thick band of asphalt-base sealant is applied to the inner surface of the pipe at the location to be taken up by the reduced diameter portion. The vertical inner end surface of the plug is also coated with the sealant. When the plug is inserted into the line, its close fit holds it in place and the sealant seals across the bore. The plug functions to isolate residual hydrocarbon vapors in the line while a new section of pipe is tied in. The plug disintegrates when contacted with the subsequent oil flow.
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patent: 3338499 (1967-08-01), Gilbert
patent: 3962767 (1976-06-01), Byerley
patent: 4357960 (1982-11-01), Han
patent: 4379722 (1983-04-01), Scott
patent: 4383783 (1983-05-01), Kruka et al.
patent: 4607664 (1986-08-01), Carney et al.
patent: 4634040 (1987-01-01), Savard
patent: 4739799 (1988-04-01), Carney et al.
patent: 4754775 (1988-07-01), Ollerenshaw
Bryant III James E.
Interprovincial Pipe Line Company
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