Pipes and tubular conduits – With closures and plugs – Inflation stem type
Patent
1980-05-19
1982-09-21
Bryant, III, James E.
Pipes and tubular conduits
With closures and plugs
Inflation stem type
138178, 428913, F16L 5510
Patent
active
043501834
ABSTRACT:
A method for permanently terminating pipelines by insertion of an adhesive coated, molded plug housing containing a biasing member which is typically a spring. The molded plug housing, or the spring, or both, are of heat-recoverable materials, i.e. materials which have been formed into a shape, subsequently deformed to a reduced diameter, and which recover towards their original heat stable shape on application of heat alone. The plug is heated to recover to or toward the heat stable greater-diameter shape thereby exerting pressure against the pipeline walls, forcing the adhesive into intimate contact with the inner surfaces of the pipeline, and thus affecting a permanent seal. The adhesive is preferably of the hot-melt type.
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Bryant III James E.
Burkard Herbert G.
Raychem Corporation
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