AS 2759:2004 Steel wire rope—Use, operation and maintenance
The design of rope anchorages on drums shall take into account the following:
(a) Where the rope is not able to be wound backwards onto the drum and at least two or more turns of rope remain on the drum, when the rope is fully extended under intended operating conditions, the frictional effect of such turns may be considered as fully contributing to the capacity of the anchorage, which shall be capable of withstanding the applied load while the rope at its lead-off position from the drum is loaded to 2 times the working load limit of the rope (i.e., line pull).
(b) Where less than two turns of rope remain on the drum when the rope is fully extended under intended operating conditions and where the rope is able to wind back onto the drum, the rope anchorage without any turns on the drum shall be capable of withstanding a load from the rope of at least 2 times the line pull of the rope. In such circumstances, the rope shall not be damaged.
(c) Where any load, jib, boom or other member cannot be lowered to the lowest possible level served by the crane, winch or hoist, because of insufficient rope length, the rope anchorages to the drum should be capable of withstanding a complete pay-out of rope and a reversal of winding without failure.
(d) The anchorage of the rope to the drum shall not decrease the strength of the rope by more than 20%.
(e) Where ropes pass through holes in flanges or shells to the anchorage system, sharp contacting edges should be removed.
(f) Where the anchorage relies on a clamping action, it shall comprize at least two clamps.
(g) Labyrinth bends or other load-absorbing devices applied to generate frictional force in an anchorage shall not damage the rope.
(h) The use of clamp plates having helical grooves to correspond to the rope can assist greatly in increasing the anchorage efficiency.
(i) Clamp plates should support as much of the rope circumference as possible, at all points of contact. Failure to adequately support the rope against deformation can lead to the rope’s pulling through.