Method of making live gas main insertions

Details Method of making live gas main insertions Method of making live gas main insertions

1989-10-20

1991-11-05

Cuda, Irene

Metal working

Method of mechanical manufacture

Gas and water specific plumbing component making

2940203, 138 97, F16L 5518

Patent

active

050622072

ABSTRACT:
A method for inserting a smaller cross sectional area, higher pressure fluid conduit or "main" into a larger cross sectional area, lower pressure fluid main, includes inserting a length of smaller diameter gas main into a length of larger diameter gas main while the larger diameter gas main remains pressurized with the gas. The method includes providing a parallel gas pathway from a section of larger diameter main upstream toward the gas supply from the length of larger diameter main into which the smaller diameter main is to be inserted.

REFERENCES:
patent: 3688801 (1972-09-01), Rohrer
patent: 3845789 (1974-11-01), Rohrer
patent: 4009732 (1977-03-01), Martin et al.
patent: 4090534 (1978-05-01), Martin et al.
patent: 4252152 (1981-02-01), Martin et al.
patent: 4253497 (1981-03-01), Martin et al.
patent: 4413655 (1983-11-01), Brown
patent: 4437494 (1984-03-01), Soper et al.

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