Method of manufacturing a metal carcass for a flexible pipe or umbilical
AssigneeCoflexip
InventorFrançois Dupoiron
Life of this patent
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Abstract
Method of manufacturing a metal carcass for flexible pipe or umbilical comprising shaping a band of metal strip and then helically winding it to form the metal carcass which, in cardioid mode, has a given collapse strength, wherein the metal strip is work-hardened prior to shaping to give it at least a 15% higher elongation at rupture, and in that the said metal carcass which is made from the said work-hardened metal strip has, in cardioid mode, a collapse strength which is at least 15% higher than the given collapse strength.
Claims6
A method of manufacturing a metal carcass for use in a flexible pipe or umbilical, which pipe or umbilical includes a pressure vault outward of the carcass, the method comprising:
- shaping a metal strip and then helically winding the strip to form a metal carcass, wherein the metal strip would have a given strength, if the metal strip were in a cardioid mode while inside the pressure vault and without work-hardening of the strip;
- the method further comprising work-hardening the metal strip, prior to shaping the strip and prior to winding the strip to form a carcass, for giving the strip elongation at rupture of at least 15% and such that the metal carcass formed by helically winding the work-hardened metal strip has in cardioid mode and while inside the pressure vault a collapse strength which is at least 15% higher than the given collapse strength.
Dependencies are inferred from the claim text.