METHOD OF WITHDRAWAL OF WORN OIL- AND GAS-LINE PIPE FROM GROUND Russian patent published in 2006 - IPC F16L1/28

Abstract RU 2276754 C2

FIELD: construction engineering; repair of underground pipe lines.

SUBSTANCE: proposed method includes digging of two pits, cutting of pipe in these pits and withdrawal of worn pipe from ground. New pipe is preliminarily placed inside worn pipe and hermetic chamber is formed; worn pipe is withdrawn from ground after placing new pipe in worn pipe by building-up pressure of air (gas) in hermetic chamber formed by inner surface of new pipe, plug at its rear end resting against stop, inner surface of flange connected with worn pipe, plug at end of flange and piston secured at front end of new pipe located inside flange.

EFFECT: reduced scope of earth-moving work.

2 dwg

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RU 2 276 754 C2

Authors

Sokolovskij Veniamin Izrailevich

Dates

2006-05-20—Published

2003-09-03—Filed