TM 5-3810-306-10WIRE ROPE AND SHEAVES SAFETY PRECAUTIONSAlways make daily inspections of wire rope and replaceworn, rusty or frayed ropes. The following information istaken from a National Consensus Standard asreferenced by Federal Government Agencies.All wire rope will eventually deteriorate to a point where itis no longer useable. Wire rope shall be taken out ofservice when any of the following conditions exist:1.In running ropes, six randomly distributed brokenwires in one lay or three broken wires in one strandin one lay.2.Wear of one-third the original diameter of outsideindividual wires.3.Evidence of heat damage from any cause.4.Reductions from nominal diameter more than 3/64inch for 3/4 diameters.How to measure or caliper a wire rope (allowablelimits -0 + 5%)A. "TRUE" DIAMETERB. CORRECTC. INCORRECTTo measure wire rope correctly, always measure thelarger dimension. *Measurement methods are for 1/4"(6.35mm) and larger wire rope.5.In standing ropes, more than two broken wires in onelay in sections beyond end connections or more thanone broken wire at an end connection.6.Crushing - Because of loose windings on a drum,rope was pulled between laying wraps of wire ropeand crushed when the loose wraps were tightened.7.Birdcaging - Sudden release of a load causingbirdcaging. Birdcaging is strands open/pulled awayfrom each other displaying the core.8.Locking, Corrosion, Pitting and Abrasion - Lack oflubrication, premature braking of wires, excessivedirt, sand or gravel embedded in the strands of thewire rope.9.Reverse Bending - Caused by running the wire ropeover one sheave and under another sheave.10. Pinch - Caused by undersized sheave grooves;breaking wire strands.Refuse to work with worn or damaged wire rope.Never handle wire rope with bare hands.Use the wire rope that is specified in TM 5-3810-306-24P.2-36
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