Wire Rope Design Factor

Wire rope is not termed oversize until its diameter exceeds the allowable maximum.

Wire rope design factor.

Wll and design factor. The design factor being both the ratio between the minimum breaking load of the rope and the rated capacity rc tells at what percentage of its ultimate strength a wire rope is operating. The design factor takes into consideration both normal rope wear and potential stresses in various applications. The rope strength design factor is the ratio of the rated strength of the rope to its operating stress.

Api spec 7k drilling and well servicing equipment upstream segment fifth edition june 2010 august 2010. The ratio between documented minimum breaking strength and the working load limit as applied to wire rope and slings. A design factor of 5 is chosen most frequently for wire rope. This term should not be confused with design safety factor defined in 3 1 5.

A design factor of 10 is usually chosen when wire rope is used to carry personnel. This design factor is a factor which is divided into the nominal strength of a sling to arrive at the wll or rated capacity. Unirope synthetic slings are manufactured to ensure a design factor of at least 5 1. Rope strength design factors.

Wire rope must be designed to have in relation to the equipment s rated capacity a sufficient minimum breaking force and design factor so that compliance with the applicable inspection provisions in 1926 1413 will be an effective means of preventing sudden rope failure. For example a 1 nominal diameter wire rope may vary between 1 and 1 05 in diameter. Wire rope strength design factors and physical properties the rope strength design factor is the ratio of the rated strength of the rope to its operating stress. If a particular rope has a rated strength of 100 000 lbs.

Wire rope design factor.