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AssigneeSubsea 7 do Brasil Servicos Ltda
InventorsPeyman ASGARI, Fernanda Cristina DE MORAES TAKAFUJI, Andre RAMIRO AMORIM, Daniel KARUNAKARAN
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A method of installing a steel catenary riser comprises progressively unspooling and launching the riser from a reel-lay vessel. The riser is plastically deformed in a straightening process aboard the vessel downstream of unspooling and upstream of launching the riser. The straightening process is adjusted to form a series of two or more residual curvature loops of locally increased curvature in a length of the riser suspended in the water column above a touch-down point. Successive loops of the series are separated and joined by a straighter portion of the riser of lesser curvature than those loops. Buoyancy elements are attached to at least one straighter portion of the riser above at least one of the loops of the series, or between successive loops of the series, or above the series of loops.
-28. (canceled)
A method of installing a steel catenary riser, the method comprising:
A steel catenary riser comprising a series of pre-formed portions that are plastically formed to different extents in longitudinal succession along a length of the riser suspended in water above a touch-down point, those portions comprising two or more residual curvature loops of locally increased curvature, successive loops of the series being separated and joined by a straighter portion of the riser of lesser curvature than those loops, wherein successive loops of the series are downwardly convex.
Dependencies are inferred from the claim text.