Method and apparatus for preventing buckling of pipeline as it i

Details Method and apparatus for preventing buckling of pipeline as it i Method and apparatus for preventing buckling of pipeline as it i

1975-03-19

1976-08-31

Shapiro, Jacob

29429, F16L 100

Patent

active

039772012

ABSTRACT:
A method and apparatus operable to produce a continuous tension along at least a prescribed portion of pipeline as it is being assembled along the ocean surface and lowered to the ocean floor. The disclosed method involves the basic steps of: assembling an elongated pipeline above or adjacent to the ocean surface; placing at least a portion of the assembled pipeline under internal gas pressure to create a longitudinal tension along that portion of sufficient magnitude to prevent buckling as it is lowered to the ocean floor; and lowering the assembled pipeline onto the ocean floor. A portion of the lower section is filled with liquid to provide a gas tight seal and to prevent lateral movement of the lowered pipeline. The apparatus is comprised of a pair of inflatable bladders connected at opposite ends of a telescoping ram cylinder. This assembly is inserted into the assembled pipeline interior and is connected by a pressure tube and control lines to a barge where the pipeline is progressively assembled. Pressurized air is directed under controlled conditions to the bladders and cylinder so a constant airtight seal is maintained at a desired location in the assembled pipeline by an "inch worm" progression involving the steps of: inflating a first bladder against the pipeline interior; deflating the second bladder; extending the cylinder to move the deflated second bladder in a preferred direction; inflating the second bladder against the pipeline interior; pressurizing the area between the inflated bladders; deflating the first bladder; retracting the cylinder to move the deflated first bladder toward the inflated second bladder; re-inflating the first bladder; and again deflating the second bladder.

REFERENCES:
patent: 2600761 (1952-06-01), Halliburton
patent: 3753091 (1973-08-01), Daspit
patent: 3890693 (1975-06-01), Eagleton et al.

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