The first part of this paper presents a general discussion of the various problems which must be addressed when combining different ropes in series or, in some cases, in using a rope in conditions where it is rotationally unrestrained. The paper will pay particular attention to the various classes of rope used in the offshore environment and their main torsional characteristics. In the second part, equipment is shown which is suitable for the measurement of the torsional response of various rope constructions at different levels of twist. Experimental data are presented for a variety of rope constructions at sizes comparable with those used in offshore applications. Comparison is made with data obtained in similar previous studies but with smaller-diameter ropes. With respect to the six-strand rope class, which is probably the most commonly used owing to its flexibility and ruggedness, the data show that the coefficients for the Feyrer-Schiffner model are similar over a wide range of diameters For the semirotation-resistant and rotationresistant classes, the work presented has shown that extrapolation of the behaviour of large-diameter ropes is possible from that of smaller-diameter ropes, but that care should be taken to ensure that the ropes are of similar construction, i.e. with the same number of layers and the same strand configuration.


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    Title :

    Torsional characterization of ropes used offshore


    Additional title:

    Charakterisierung der Torsion von im Offshore-Bereich verwendten Seilen


    Contributors:


    Publication date :

    2008


    Size :

    19 Seiten, 16 Bilder, 7 Tabellen, 34 Quellen




    Type of media :

    Article (Journal)


    Type of material :

    Print


    Language :

    English