Ships – Building – Canal and ferry boats
Patent
1976-05-17
1978-03-28
Shapiro, Jacob
Ships
Building
Canal and ferry boats
114270, 114 61, B63B 3504, F16L 100
Patent
active
RE0295914
ABSTRACT:
The stinger segment includes a base structure having a plurality of upstanding stabilizing columns on opposite sides of its pitch and roll axes and carrying pipeline supports which permit translational movement of the pipeline relative to the stinger segment. The stinger segment is pivotably secured behind the pipelaying barge and is ballasted from a low draft condition with the base structure having freeboard to a high draft condition with the mean waterline located at about one half the effective height of the stabilizing columns when in the pipeline supporting position. The pipeline supports progressively decrease in height above the base structure from the end of the segment nearest the barge toward the opposite end such that a line extending along the supports defines a radius of curvature at least equal to and preferably much greater than the minimum allowable radius of curvature for the pipeline. The stinger segment is preferably configured such that the combined natural frequency of the segment, pipeline, and stinger match the natural frequency of the pipelaying barge. A stinger is secured to the aft end of the stinger transition segment to guide and support pipeline aft of the segment and before disposition on the sea floor.
REFERENCES:
patent: RE28922 (1976-08-01), Lloyd
patent: 1753399 (1930-04-01), Blair
patent: 3321925 (1967-05-01), Shaw
patent: 3407610 (1968-10-01), Wolff
patent: 3411306 (1968-11-01), Mosby
patent: 3440826 (1969-04-01), Kline
patent: 3462963 (1969-08-01), Moore
patent: 3507126 (1970-04-01), Rochelle
patent: 3589136 (1971-06-01), Sorenson
Santa Fe International Corporation
Shapiro Jacob
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