WIRE ROPE FAILURE


Wire Rope Characteristics


COMMONLY USED ROPE (NON -COMPACTED) CHARACTERISTICS SIMPLY STATED

  • More wires in the outer strand (14 for 36SW) will improve bend fatigue.
  • Less wires in the outer strands (9 for 19S) improve wear/abrasion resistance     characteristics
  • Steel core (IWRC) resists drum crushing better than fibre core.
  • Langs lay resists interference at drum better than ordinary lay.

Abrasion Resistance


Comparison of outer wire sizes for 25mm diameter rope, as illustration.

6*7
6 Outer Wires
2.54mm
6*19S
9 Outer Wires
2.11mm
6*25F
12 Outer Wires
1.70mm
6*36SW
14 Outer Wires
1.49mm
6*41SW
16 Outer Wires
1.34mm
SWGD
50
200



TYPES OF TYPICAL FAILURES


RECOMMENDED DO’S & DONT’S

    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.

    Don't’s

  • 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 sufficiently flexible for the size of drum or pulley
  • Do not load the rope beyond its safe working load Reduction of safety factor     may jeopardise not only rope, but also equipment, job and men.

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

Fleet Angle

Rope Cutting Procedure



Note: Seizing wire recommendation for ungalvanised rope - use annealed wire.



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