Steel Wire Rope ... |
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Discard Criteria |
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- For Single – layer construction, if the reduction in diameter is greater than 8% (eg.6X7)
- For multilayer construction, if the reduction in diameter is greater than 5 % (eg. 6X19, 6X26 etc)
Total no. of visible broken wires exceed 10% of the total no. of wires in the rope, in a length of 8 X dia. Of rope or 3 or more adjacent broken wires in a strand.
- Evidence of considerable plastic wear or surface embrittlement.
- Localised distortion, damage or kink, bird-caging, crushing.
- Localised diameter reduction or lay variation associated with waviness.
- Collapsed core or one strand broken coupled with wire looseness and bulging.
- Corrosion / chain pitting & associated fatigue of wires.
- Damage due to heat / fire.
- Rope has been subjected to severe shock load or overload due to some accident with equipments.
- End-fitting / attachments damaged or cracked or deformed or worn out.
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Do’s
- Lubricate ropes with good quality acid free and moisture free lubricant. Regularly inspect the sheaves, rollers or pulleys – the life of a rope largely depends on their conditions.
- Inspect ropes and fittings / terminations periodically.
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Note: The inspector also refer international standards like ISO 4309 and BS 6570 or any other relevant standard for the purpose, as a tool, for discarding a wire rope. |
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Don’ts
- Do not allow ropes in store to deteriorate
- Do not mishandle ropes when uncoiling or unreeling & allow kinks to form.
- Do not use langs lay with a swivel
- Do not use a rope with too large groove diameter on drums and pulleys.
- Do not cut a rope without seizing
- Do not use rope which is not sufficiently flexible for the size of drum or pulley.
- Do not load the rope beyond its safe working load. Reduction of safety factor may jeopardize not only rope, but also equipment, job and men.
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Note: Remember- Care in handling, installation, and careful inspection gives more life and enormous dividends. |
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