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An Introduction to Wire Rope Inspection

An introduction of Wire Rope Inspection

Wire rope is a type of rope which consists of several strands of metal wire laid (or 'twisted') into a helix. Initially wrought iron wires were used, but today steel is the main material used for wire ropes.
Wire rope slings are a basic material handling tool and are the most frequently used type of sling in industry today.
Wire ropes are widely used for cranes & in winches for rigging work for lifting of heavy materials. Many of the safety related incidents in rigging occur due to the faulty/broken of wire ropes & improper choice.

An introduction of Wire Rope Inspection

Requirements of wire rope:

ü  Possess sufficient strength to take the maximum load that may be applied.
ü  Withstand repeated bending without failure of wires from fatigue.
ü  Resist abrasion.
ü  Withstand distortion and crushing.
ü  Resist rotation.
ü  Resist corrosion.

Construction of wire rope:

A wire rope shall  consist of many individual wires laid into a number of stands, which are in turn laid around a center core.

The term rope lay signifies the direction of rotation of the wires and the stands in the rotation is either to right (clockwise) or left (anticlockwise). A rope lay is the length along the rope in which one strand makes a complete revolution around rope. 

Inspection of wire rope:

v  A wire rope on continuous service shall be observed during normal operation and visually inspected on a weekly basis. A complete and thorough inspection of all ropes in use shall be inspected at least once a month.
v  A wire rope which has been idle for a period of one month or more shall be given a thorough inspection before put back into service.
v  A wire rope shall be tested before taking into use and examined by government authorized competent person at least once a year.
v  If there is evidence that the wire rope has been crushed, abraded, flattened, bird caged or has sustained any other damage that distorts it; the rope should be removed from service.

wire rope Do's:
v  Find out the weight for the load to be lifted.
v  Examine all slings before use and discard those that are defective.
v  Protect sling from sharp corners by packing suitable material such as rubber or wood.
v  Use protective gloves when handling steel wire rope.
v  Keep wire rope slings in dry place when not in use.

wire rope Dont's:
v  Do not use the sling for any load exceeding the stated SWL.
Where, Safe Working Load (SWL) = 8 x (Rope diameter in inch) ² Tones
v  Do not use a sling that are kinked, crushed, bird caged or otherwise damaged.
v  Do not use wire rope slings with severe wear, abrasion or scraping, wire rope with metal loss of 1/3 of the diameter of individual outside wires should be discarded.
v  Do not bend splice over corners.
v  Do not exceed 120 degrees when using multi-legged wire rope sling.
v  Do not drag wire rope slings along the floor.
v  Never join wire rope slings by knotting , always

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