Hydraulic and earth engineering – Subterranean or submarine pipe or cable laying – retrieving,... – Submerging – raising – or manipulating line of pipe or cable...
Patent
1989-02-16
1989-12-19
Corbin, David H.
Hydraulic and earth engineering
Subterranean or submarine pipe or cable laying, retrieving,...
Submerging, raising, or manipulating line of pipe or cable...
138 93, 405158, F16L 104
Patent
active
048879312
ABSTRACT:
A method and apparatus are provided for towing of a fluid containing tubular conduit above a sea bed floor and within a body of water, such as an ocean or river. First and second inflatable sealing elements are placed within the interior of the conduit with each of the sealing elements being movable from an unexpanded to an expanded position to effect a sealed interior section of the conduit. A movable pig is placed within the section and between the sealing elements and is activatable to displace fluid within the section when the sealing elements are in sealed relation to the conduit. A valve means is provided for discharge of the fluid out of the section during movement of the pig. A gaseous body is selectively injected through means, such as a valve, into the section to urge the pig into displacement motion whereby buoyancy may be provided through the section sufficient to raise and move the conduit above the sea bed floor while maintaining all of the conduit submerged within the body of water for towing purposes.
REFERENCES:
patent: 3136133 (1964-06-01), Perret
patent: 3479831 (1969-11-01), Teague
patent: 4011620 (1977-03-01), Southgate
patent: 4377354 (1983-03-01), Morton
Conover George E.
Frisby Raymond A.
Baker Hughes Incorporated
Corbin David H.
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