Abstract
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.
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