Method for forming a temporary plug in a fluid conduit

Details Method for forming a temporary plug in a fluid conduit Method for forming a temporary plug in a fluid conduit

1981-12-08

1984-01-31

Capossela, Ronald C.

Refrigeration

Processes

Treating an article

62293, 62514R, 138 97, F25D 2500

Patent

active

044282044

ABSTRACT:
A flow stopping plug is formed in a conduit such as a fluid transmission pipeline by tapping a relatively small hole in the side of the pipe directly adjacent the desired location of the plug and inserting a flexible bag through the hole using a radially extendable bag insertion apparatus having a tube containing the bag initially in a collapsed or folded condition. The bag is connected to a conduit assembly which provides for filling the bag with water in the deployed position inside the pipe. After the bag is filled with water, a freezing process is carried out preferably using a cryogenic fluid which is circulated around the exterior of the pipe section directly adjacent to the bag. The conduit assembly connected to the bag may be placed in communication with a source of heating fluid for melting the ice plug formed within the bag after completion of the work process in connection with which the ice plug was deployed. In an alternate embodiment of the conduit system, a conduit loop or coil is provided which is disposed inside the flexible bag and is adapted to alternately be in communication with a source of cryogenic fluid and the heating fluid to provide for accelerating the freezing and melting process.

REFERENCES:
patent: 3310615 (1967-03-01), Bender
patent: 3926006 (1975-12-01), Brooks et al.
patent: 4112706 (1978-09-01), Brister

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