| 摘要 |
<p>An umbilical for use in the offshore production of hydrocarbons, and in particular a power umbilical for use in deep water applications, is described comprising a plurality of longitudinal strength members 17, wherein at least one longitudinal strength member comprises rope comprising high strength organic fibres having a tensile modulus >100GPa. Suitable materials are Zylon®, Vectran®, Twaron®, Technora®, Kevlar®, Spectra®, liquid crystal fibres, aramid fibres, high-performance polyethylene fibres and/or aromatic heterocycyclic polymer fibres. In this way, the or each longitudinal strength member being such a rope achieves the synergistic benefit of favourable mechanical properties in the axial direction, with weight reduction and other favourable mechanical properties, especially during tensioning or the like of the umbilical, more especially during manufacture, installation and/or repair. With weight reduction, longer umbilicals for deeper water can be made and used.</p> |
