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Steel Wire Rope ...
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Wire Rope Components   |   Fundamental Constructions   |   Lay   |   Storage   |   Types of Typical Failures
Discard Criteria   |   Construction of Wire Ropes   |   Why Usha Martin Rope   |   How to Order A Rope
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Discard Criteria
 
  • 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.
 

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.
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.
 
 

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.
Note: Remember- Care in handling, installation, and careful inspection gives more life and enormous dividends.
 
 

 

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