Patent ID: 7318454
Filing Date: 2008-01-15
Classification: E21B,F15D,F16L

Abstract:
1. A flexible tubular pipe for transporting fluids, the pipe being of the unbonded type and comprising from inside outward at least a carcass, a polymer internal sealing sheath operative to provide sealing for the transported fluid and one or more armor layers, the carcass, being situated inside the internal sealing sheath, the carcass comprising an interlocked spiral winding of a profiled element, the winding comprising turns of the carcass, and the turns of the carcass form internal discontinuities between successive turns, an anti-turbulence sheath internally covering the turns of the winding, the anti-turbulence sheath being pierced with holes that are intended to oppose turbulence of fluid flowing in the pipe, the anti-turbulence sheath is positioned such that the holes in the pierced anti-turbulence sheath are situated partially at internal discontinuities between the turns such that the holes prevent the antiturbulence sheath from collapsing if the interior of the pipe is decompressed.