Method and installation for laying a pipe-line

Details Method and installation for laying a pipe-line Method and installation for laying a pipe-line

1995-06-07

1996-12-31

Schoeppel, Roger J.

Hydraulic and earth engineering

Subterranean or submarine pipe or cable laying, retrieving,...

Submerging, raising, or manipulating line of pipe or cable...

138149, 285 47, 285915, F16L 112

Patent

active

055887805

ABSTRACT:
The invention relates to a method for laying a pipe-line, wherein pipes are welded to each other along a ring weld and wherein the ring weld is covered with a mastic ring.
In the known method of this type the mastic of asphalt bitumen is melted and cast into a mould arranged round the ring weld.
Working with a hot substance (180.degree. C.) is dangerous. The vapours from melted asphalt bitumen create an unpleasant and unhealthy work climate. The quality of asphalt bitumen deteriorates the more melted it becomes.
The invention has for its object to provide a method wherein the above stated and/or other drawbacks occur either at least to a lesser extent or not at all. To this end the method according to the invention has the feature that the mastic is arranged substantially in plastic condition around the ring weld.

REFERENCES:
patent: 4100751 (1978-07-01), Thomason
patent: 4103505 (1978-08-01), Howerton
patent: 4162093 (1979-07-01), Sigmund
patent: 4289172 (1981-09-01), Ekstrom
patent: 4459251 (1984-07-01), Elridge et al.
patent: 4509561 (1985-04-01), Litz
patent: 4808031 (1989-02-01), Baker
patent: 4909669 (1990-03-01), Baker
patent: 5186217 (1993-02-01), Kallinich et al.

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