Pipes and tubular conduits – With closures and plugs – Inflation stem type
Patent
1993-04-26
1995-03-28
Bryant, III, James E.
Pipes and tubular conduits
With closures and plugs
Inflation stem type
138 93, 138 97, F16L 5500
Patent
active
054008263
ABSTRACT:
A method and kit is provided for temporarily blocking the bore of a pipe through which a fluid flows, the kit including an expansible flexible bag seal which is inserted through a hole provided in the wall of the pipe injecting into the bag seal. A quantity of a material adapted to expand in situ in the bag seal and inflate the bag seal to seal against the inside of the pipe is injected into the bag seal. The pipe may be a gas main and the material may be an expandable synthetic resin foam. The bag seal is removed by injecting thereinto a substance capable of dissolving the foam so that the bag seal can be at least partially deflated.
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British Gas plc
Bryant III James E.
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