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beyond anything www.kiswire.com Spinning loss In the beginning there was a parallel laid bundle of wires to lift or to pull, to move load. But the parallel bundle could not be bent over drums or sheaves. Hence, one twisted or spinned the bundle into a helical shape in order to bend the bundle, the rope. The parallel bundle of wires had a strength (MBL) which was the sum of each individual wire (calculated breaking load) In case of the spinned rope spinning loss occurred. The average spinning loss is 18%. Calcula- ted breaking load minus spinning loss is minimum breaking load. Constructional torque and axial stiffness Torsional torque occurs due to the above spinning. When a spinned rope is put under load, the individual wires want to return to their original parallel laid shape. When the load is taken off the rope, all components return to their helical, spinned shape. This phenome- non implies that all ropes untwist or turn out under load and turn in again when load is released. Torsional torque is one of the most crucial issues related to the design, choice, use of wire rope. Torsional torque is a phenomenon that goes with wire rope as rain and water ; any wire rope type except the perfect non rotating ones show torsional torque under load. The amount of torque depends on the amount of load, type of construction and lifting speeds. As a guide line torque values for each type of rope are available. Our N2 35X7 and 35x19S and 35x26WS have been indicated on the leaflets of these ropes. The same theory goes for axial stiffness. Data is shown in the tables of each catalogue. Average torque factors for the following rope constructions are : 4x39WS+IWRC torque 0.022 6x36WS+IWRC torque 0.068 8x36WS+IWRC torque 0.082 35xK7/40xK7/55xK7 torque 0.0065 35xK26WS. torque 0.0050 Kiswire is the largest wire rope producer in the world. Annually, about 140.000 tons of wire rope is delivered, worldwide. For decades, Kiswire is specializing in the development and production of wire rope. Meanwhile, the company has acquired a reputable and leading position in a great variety of markets, in literally all corners of the world. The offshore industry is one is a main market for Kiswire since 25 years, meanwhile. Technical Data Sheet 5