Method for shutting off gas flow in plastic pipes

Details Method for shutting off gas flow in plastic pipes Method for shutting off gas flow in plastic pipes

1976-12-06

1979-05-22

Cohan, Alan

Fluid handling

Processes

Cleaning, repairing, or assembling

137318, 138 93, F16L 5512

Patent

active

041553730

ABSTRACT:
A tubular plastic fitting is joined to the pipe wall of a plastic gas pipe and a hole is cut through the pipe wall within the fitting, leaving a ledge or shoulder around the hole as a stop for a balloon-type stopper which is then inserted and inflated within the pipe to shut off the flow of gas without substantial leakage of gas to the atmosphere. There is a ringlike compression seal within the fitting that prevents escape of gas around the cutting tool during the cutting operation and also further assures prevention of gas leakage around the stopper when the stopper is inflated within the pipe. After removal of the stopper, a closure member is placed on the pipe fitting.

REFERENCES:
patent: 1946138 (1934-02-01), Gardner
patent: 3298398 (1967-01-01), Smith
patent: 3799182 (1974-03-01), Long
patent: 3805844 (1974-04-01), Bacon
patent: 3973584 (1976-08-01), McKinnon

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