Marine pipelaying and handling of rigid pipelines
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United States of America Patent
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Sep 19, 2000
Grant Date -
N/A
app pub date -
Nov 4, 1998
filing date -
Nov 24, 1995
priority date (Note) -
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Abstract
A support elelment (12) for supporting a rigid pipeline (10) during plastic bending of the pipeline has a transverse cross-sectional configuration such that, in use, a pipeline supported by the support element contacts said support element is at least first and second points (14, 16) disposed substantially symmetrically on either side of the plane of bending, the points of contact being arranged such that resultant forces between the pipeline and the support element act at points which are disposed substantially symmetrically about the plane of bending and which are spaced apart by an angle a greater than 90.degree. and less than 180.degree. around the cross-sectional circumference of the pipeline. The angle a is selected so as to minimize ovalisation for a pipeline of given material, diameter and wall thickness, and for a given bend radius and pipeline tension, or to provide useful modification of ovalisation over ranges of these parameters. For most practical applications, the optimal angle a will e greater than 90.degree. and less than or equal to 150.degree. . In preferred embodiments of the invention, the angle a is greater than 90.degree. and less than or equal to 110.degree..
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