Method of removing chips from the end portion of an upwardly ext

Details Method of removing chips from the end portion of an upwardly ext Method of removing chips from the end portion of an upwardly ext

1984-09-04

1986-07-08

Goldberg, Howard N.

Fluid handling

Processes

Cleaning, repairing, or assembling

2940208, 137 13, 137315, 137334, 138 89, 138 97, 376309, 376463, 405156, F16L 3728

Patent

active

045987270

ABSTRACT:
The invention is directed to a method of performing remotely-manipulated ntenance work on upwardly extending conduits in a radioactively-ladened cell such as a large-area cell of a nuclear facility for reprocessing irradiated nuclear fuel. A conduit segment is sawn out of a vertical conduit and a new conduit segment welded into place. The removal of cutting chips from the lower vertical end portion of the conduit after the conduit segment has been sawn out is achieved by freezing the liquid medium in the conduit to form frost plugs above and below the tube portion to be removed. A third frost plug is formed in the lower portion of the vertical conduit above the frost plug which has already been produced therein. Thereafter, the tube portion to be removed is cut and separated from the conduit. Then an anchor member is lowered into the lower end portion of the conduit onto the third frost plug. The liquid medium in the lower end of the conduit above the third frost plug is frozen with the cutting chips and the anchor member and, with aid of the anchor member, is withdrawn from the lower end portion of the conduit in an upward direction together with the third frost plug.

REFERENCES:
patent: 3710812 (1973-01-01), Wise
patent: 4255840 (1981-03-01), Loch et al.
patent: 4370862 (1983-02-01), Brister

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