Flexible pipe, especially an offshore oil flow-line or riser, has a high inertia wound wire band which is thicker than an underlying spiral wound interlocked metallic element

摘要

A flexible pipe, comprises a wound metal wire band (4) which is thicker than an underlying spiral wound interlocked metallic element (3). A flexible pipe comprises an internal interlocked strip body (1), an inner polymeric sealing sheath (2), a close pitched spiral winding of an interlocked metallic element (3), a close pitched non-interlocked wound metal wire band (4), a tensile reinforcement sheet (5) wound at a wide pitch around the compression dome and an external polymeric sealing and protection sheath, the thickness (Ef) of the band being greater than the thickness (Ez) of the metallic element (3). Preferred Features: The thickness (Ef) of the band is 1 to 3 times the thickness (Ez) of the metallic element (3). The metallic element (3) is a profiled wire, especially of 'zeta' cross-section, or is an interlocked strip.