公开(公告)号：US20220403957A1

公开(公告)日：2022-12-22

申请号：US17756086

申请日：2020-11-16

Applicant: National Oilwell Varco Denmark I/S

Inventor： Inger-Margrete Procida ,  Adam Rubin ,  Anders Lyckegaard

IPC: F16L11/08

Abstract: A subsea installation including an unbonded flexile pipe for subsea transportation of a H2S and/or CO2 containing fluid. The unbonded flexible pipe includes from inside and out, a pressure sheath defining a bore for transportation of the fluid, a tensile armor and a liquid impervious outer sheath, wherein the tensile armor is of corrosion resistant material(s) and the tensile armor includes at least two cross wound layers of elongate armor elements, which are wound with a long pith and wherein the pipe further includes an anti-bird cage layer including at least one elongate element wound with a short pitch onto at least one of the tensile armor layers, and wherein the at least one elongate element includes or consist of steel, titanium and/or fibers of carbon, basalt, polyethylene, PVDF (polyvinylidene fluoride or polyvinylidene difluoride) PEEK (polyether ether ketone) PVC (polyvinyl chloride), LCP (liquid crystalline polymer) or any combinations thereof.