Hydraulic and earth engineering – Subterranean or submarine pipe or cable laying – retrieving,... – Submerging – raising – or manipulating line of pipe or cable...
Patent
1996-02-14
1997-11-04
Graysay, Tamara L.
Hydraulic and earth engineering
Subterranean or submarine pipe or cable laying, retrieving,...
Submerging, raising, or manipulating line of pipe or cable...
405172, 405158, 405169, F16L 116
Patent
active
056832044
ABSTRACT:
An apparatus and method for laying underwater pipeline which includes a plurality of buoyancy control valves formed thereon. Each buoyancy control valve includes an air escape hole formed in the pipeline with a sliding weight member disposed in a first position upstream immediately adjacent to an air escape hole. During use, the air escape holes enables air to escape from the pipeline as it sinks at one end and descends to the sea floor in a catenary. As it descends to the sea floor, the sliding weight member slides via gravity from a first to a second position on the pipeline. When disposed in the second position, the sliding weight member covers the adjacent air escape hole. A hydraulically controlled restraining chain is disposed around the pipeline to control the sliding action of the sliding weight member until the pipeline has reached a pre-determine depth. When the pipeline has reached the desired depth, the chain is automatically removed and the sliding weight member is able to slide into the second position.
REFERENCES:
patent: 4127006 (1978-11-01), Oosterkamp
patent: 4127007 (1978-11-01), Mathieu et al.
patent: 4326821 (1982-04-01), Stephens
patent: 4563108 (1986-01-01), Ayers
Craine Dean A.
Graysay Tamara L.
Lagman Frederick L.
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