Temporarily blocking the bore of a pipe through which a fluid fl

Details Temporarily blocking the bore of a pipe through which a fluid fl Temporarily blocking the bore of a pipe through which a fluid fl

1994-11-30

1997-11-18

Scherbel, David

Pipes and tubular conduits

With closures and plugs

Inflation stem type

138 93, 138 97, F16L 5512

Patent

active

056877714

ABSTRACT:
A kit is provided for temporarily blocking the bore of a pipe through which a fluid flows, the kit comprising an expansible flexible bag seal which is inserted through a hole provided in the wall of the pipe and an apparatus for 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. 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.

REFERENCES:
patent: 4012822 (1977-03-01), Vrolyk et la.

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