Hydraulic and earth engineering – Subterranean or submarine pipe or cable laying – retrieving,... – With forming or cutting of pipe or cable
Patent
1986-07-23
1988-02-09
Stodola, Nancy J.
Hydraulic and earth engineering
Subterranean or submarine pipe or cable laying, retrieving,...
With forming or cutting of pipe or cable
405154, 405184, 62 64, 62320, 62373, 138 97, 225 935, 225103, F16L 102, F16L 5518, B26F 300, F25D 1702
Patent
active
047238739
ABSTRACT:
To prepare an existing buried main made from a material which is tough at ambient temperature for replacement by a new main of the same or a larger size via a mole device by fracturing the existing main by compressive and impact forces and by widening the bore for the insertion of the new main that is clamped to the mole device, a liquefied gas having as low a boiling point as possible at atmospheric pressure is sprayed against the conduit wall from a cooling carriage that is pulled through the existing main prior to the movement of the mole device therethrough, thereby cooling the existing main to a temperature causing low-temperature embrittlement of the material of the existing main.
REFERENCES:
patent: 2956717 (1960-10-01), Scharf
patent: 3878978 (1975-04-01), Martinek
patent: 3979981 (1976-09-01), Lightstone et al.
patent: 4110092 (1978-08-01), Kunioka et al.
patent: 4487643 (1984-12-01), Ellett
patent: 4505302 (1985-03-01), Streatfield et al.
Ruhrgas Aktiengesellschaft
Stodola Nancy J.
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