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VORNBÄUMEN APPLICATION ROTATIONAL PROPERTIES TECHNICAL NOTES IV ROTATIONAL PROPERTIES Rotation-resistant ropes are ropes that are designed such that they create a reduced torque and a reduced rotation under load. In general, they are composed of a construction of at least two strand layers that are helically stranded around a core. The outer strand layers in this construction are stranded opposite to the strand layer below. ROTATION-RESISTANT A The rotational property is less than or equal to 1 rotation/1,000 d, when a load corresponding to 20% of the minimum breaking force is lifted; a swivel may be used. ROTATION-RESISTANT B The rotational property is greater than 1 rotation but less than 4 rotations/1,000 d, when a load corresponding to 20% of the minimum breaking force is lifted; a swivel may be used in accordance with the recommendations of the rope manufacturer and/or with the approval of a competent person. NOT ROTATION-RESISTANT The rotational property is greater than 4 rotations/1,000 d under a load corresponding to 20% of the minimum breaking force; a swivel should not be used. 1 rotation = 360° d = rope diameter F min = minimum breaking force of the rope FC IWRC WSC W1 C1 K1 W2 C2 K2 W3 C3 K3 6 x 7 0.345 0.369 0.332 0.384 0.432 0.359 0.384 0.432 0.388 6 x 19 0.359 0.384 0.330 0.400 0.449 0.356 - - - 6 x 19M 0.346 0.357 0.307 - - 0.332 0.381 0.418 0.362 6 x 36 0.367 0.393 0.330 0.409 0.460 0.356 - - - 6 x 37M 0.346 0.357 0.295 0.381 0.418 0.319 0.381 0.418 0.346 8 x 36 0.348 0.357 0.293 0.417 0.468 0.356 - - - 18 x 7 0.382 - 0.328 - - - 0.401 0.433 0.328 TABLE OF CALCULATION FACTORS K = minimum breaking force factor C = factor for the metallic nominal cross section W = factor for the calculated length mass See EN 12385-4 LIFTING CAPACITY The lifting capacity of a rope is calculated from the minimum breaking force. This is divided by the prescribed safety factor for the respective application. See EN 12385-3 Example: safety factor 5 = minimum breaking force 5