Shock absorbing apparatus for hoisting underwater pipeline

Details Shock absorbing apparatus for hoisting underwater pipeline Shock absorbing apparatus for hoisting underwater pipeline

1977-08-31

1979-05-08

Stein, Mervin

Hydraulic and earth engineering

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

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

294 66R, 405158, F16L 104

Patent

active

041533810

ABSTRACT:
A pipe laying vessel has a hoisting winch whose cable is connected to an underwater pipeline during abandonment and recovering operations by a shock absorbing device inserted into and connected to the free end of the pipeline. The shock absorbing device includes a pre-pressurized hydraulic accumulator which is hydraulically coupled to a cylinder and piston, the piston being connected to the hoisting cable with shock loading due to wave action on the vessel being converted to movement of the piston in the cylinder and against pressure of the accumulator.

REFERENCES:
patent: 2495516 (1950-01-01), Foster
patent: 2981074 (1961-04-01), Wilder
patent: 3319426 (1967-05-01), Slonczewski
patent: 3525226 (1970-08-01), McCarron

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