Method and apparatus for remotely and releasably sealing a pipel

Details Method and apparatus for remotely and releasably sealing a pipel Method and apparatus for remotely and releasably sealing a pipel

1975-06-30

1977-05-31

Aegerter, Richard E.

Pipes and tubular conduits

Repairing

337140, F16L 5512

Patent

active

040263290

ABSTRACT:
Methods for releasably plugging off a section of a pipe line and apparatuses for practicing or carrying out the methods are disclosed. An apparatus comprises one or more pigs, each pig having an inflatable ring therearound, inert gas therein for inflating the ring, and a remote thermal command signal receiver for initiation of expansion of the pigs responsive to a remote thermal command signal of one temperature generated by a generator at the ends of the pipe section to be sealed off for sealing the pigs in the pipe as they reach their respective pipe section termini. The remote command signals comprises thermal energy of precise temperatures.

REFERENCES:
patent: 2083317 (1937-06-01), Dallenbach
patent: 2929410 (1960-03-01), Morrison
patent: 3285290 (1966-11-01), Morrison
patent: 3381714 (1968-05-01), Johnson
patent: 3483895 (1969-12-01), Barto
patent: 3495626 (1970-02-01), Nagel
patent: 3652969 (1972-03-01), Willson et al.

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