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beyond anything www.kiswire.com When a ropes passes the groove of a sheave or a drum, pressure between the 2 surfaces occurs, due to radial forces. The working life of a rope depends partly on the amount of this surface pressure. Much pressure causes more deterioration and fatigue. Here are some main criteria as to surface pressure. The more metallic area of the rope in contact with the groove, the lower the relative pressure will be. (1) Lang’s Lay Wire Ropes have a line contact with the surface of sheaves and drums, whereas, Regular Lay Wire Ropes have point contact with the same. Hence, Lang’s Lay Wire Ropes have more metallic area in contact with the sheave or drum than a Regular Lay Wire Rope. Assume, the absolute surface pressure is 100, while the contact metallic area of a regular lay wire rope is 20, the relative surface pressure becomes 100 : 20 = 5 Assume, the absolute surface pressure is 100, while the contact metallic area of a Lang’s lay wire rope is 25, the relative surface pressure becomes 100 : 25 = 4 Surface pressure – between ropes and drum/sheave grooves types of lay versus surface pressure Be aware that Lang’s lay wire ropes must be fixed at both ends of the rope, due to high torque characteristics. (2) 8 strand (versus 6 strand wire ropes) have more metallic area to be in contact with sheaves and drums. (3) Multi strand ropes expose the highest amount of groove contact. (4) Compacted ropes have an improved groove contact, hence compacted ropes show better surface pressure figures than regular round strand ropes. 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 2 ROPE TECHNOLOGY Relative surface Pressure 4 strand 6 strand 8 strand Multi strand SURFACE PRESSURE METALLIC AREA METALLIC AREA RELATIVE Regular lay Lang’s lay
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