Submarine pipeline span correction by local axial tension releas

Details Submarine pipeline span correction by local axial tension releas Submarine pipeline span correction by local axial tension releas

1989-08-07

1990-03-20

Reese, Randolph A.

Hydraulic and earth engineering

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

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

405165, 405158, 405171, 405172, 405173, 25413435C, F16L 104

Patent

active

049096702

ABSTRACT:
A method of locally supplying slack to an axially tensioned length of pipeline spanning unsupported across an undulating seabed. During pipeline deployment, the pipeline is fitted with two weighted masses that will be positioned on either side of the undulation to be spanned. These masses will be spaced a predetermined distance from each other along the seabed, this distance being less than that between them along the pipeline. Also during deployment, the mid-region of this span is vertically deflected upward while retaining the axial tension in the pipeline. Once the pipeline is properly positioned, the vertical deflection of the pipeline is reduced thereby relieving the axial tension in the pipeline while also introducing sufficient pipeline slack such that the pipeline can closely follow the contours of the undulating seabed.

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patent: 4498812 (1985-02-01), Lanfranconi et al.
patent: 4755947 (1988-07-01), Braschler

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