ABSTRACT

Use of high performance fibre ropes (HPFR) is attractive in subsea operations due to high strength and low weight making lifting operations in deep waters possible with practically no reduced lifting capacity. However, experiments show that HPFRs can cause higher loads on multilayer winch drums compared to steel wire ropes. This paper presents comparisons between experimental stress measurements and calculation methods for a steel wire and two different HPFRs, wound in 10–14 layers at different rope tensions. The results show that the tangential stresses in the drum are reasonably assessed for the steel wire and a dimensionally stable HPFR, but considerably underestimated for a more deformable HPFR with more than 3–7 layers of rope, dependent on rope tension. The results also show that the method specified by class-societies is not capable of calculating relevant tangential stress in multilayer winch drums with HPFRs.

摘要

由于高强度和低重量，在海底作业中使用高性能纤维绳（HPFR）颇具吸引力，这使得在深水区进行起重作业成为可能，而起重能力实际上并未降低。但是，实验表明，与钢丝绳相比，HPFR可以对多层绞盘鼓造成更高的负载。本文介绍了钢丝和两种不同的HPFR的实验应力测量和计算方法之间的比较，这两种钢丝缠绕在10-14层，且绳索张力不同。结果表明，对于钢丝和尺寸稳定的HPFR，合理评估了滚筒中的切向应力，但对于超过3-7层绳索的更易变形的HPFR，则视绳索张力而定，低估了这一点。