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Deterioration of rope.ppt

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KISHAN KUMAR

The document discusses three main causes of rope deterioration in mines: 1) Wear from friction with drums and pulleys and internal movement of strands, which can be minimized by design, layout, and lubrication. 2) Corrosion from contact with acidic or alkaline water internally and externally, which can be reduced by proper lubrication and galvanization. 3) Fatigue from repeated stress, which occurs near caps and can be decreased by correct installation, winding regularity, and cutting ropes during recapping. Corrosion fatigue, involving both corrosion and stress, causes the most deterioration with no fatigue limit and multiple cracks.

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CAUSES of DETERIORATION Of ROPE in MINES 1. Wear 2. Corrosion 3. Fatigue 1. WEAR : • It is due to friction of rope with drums & pulleys. • Due to differential internal movement of strands. • Wear is partly abrasive due to removal of metal from the outer wire. • Wear is minimised by paying attention to design, layout & lubrication of the moving pulleys.
2. CORROSION : • The external Corrosion is due to contact of acidic or alkaline water. • The internal Corrosion is worst in presence of moisture together with the acids liberated by the lubricant. • A small Corrosion is worst to produce failure than a considerable amount of rusting.  Corrosion can be minimised by : a. Proper lubrication, & b. BY using galvanised wire rope
3. Fatigue : • It is the physical change in the condition of a rope after repeated applications of stress. • The stress below which fatigue doesn't occur is called "Fatigue Limit". • The fatigue of winding rope is likely to occur near the capel because of various vibrations, kinetic stresses & shocks are arrested & reflected at this point.
 Fatigue can be reduced by : • Correct installation & regularity in winding. • Cutting of 3 meter length of rope at each recapping.  CORROSION FATIGUE : • When the rope is subjected simultaneously to both Corrosion & repeated stressing, much more deterioration occurs. • There is no fatigue limit under corrosive conditions. • The most characteristic evidence of Corrosion fatigue is presence of multiple cracks.

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Deterioration of rope.ppt

  • 1. CAUSES of DETERIORATION Of ROPE in MINES 1. Wear 2. Corrosion 3. Fatigue 1. WEAR : • It is due to friction of rope with drums & pulleys. • Due to differential internal movement of strands. • Wear is partly abrasive due to removal of metal from the outer wire. • Wear is minimised by paying attention to design, layout & lubrication of the moving pulleys.
  • 2. 2. CORROSION : • The external Corrosion is due to contact of acidic or alkaline water. • The internal Corrosion is worst in presence of moisture together with the acids liberated by the lubricant. • A small Corrosion is worst to produce failure than a considerable amount of rusting. ï‚¡ Corrosion can be minimised by : a. Proper lubrication, & b. BY using galvanised wire rope
  • 3. 3. Fatigue : • It is the physical change in the condition of a rope after repeated applications of stress. • The stress below which fatigue doesn't occur is called "Fatigue Limit". • The fatigue of winding rope is likely to occur near the capel because of various vibrations, kinetic stresses & shocks are arrested & reflected at this point.
  • 4. ï‚¡ Fatigue can be reduced by : • Correct installation & regularity in winding. • Cutting of 3 meter length of rope at each recapping. ï‚¡ CORROSION FATIGUE : • When the rope is subjected simultaneously to both Corrosion & repeated stressing, much more deterioration occurs. • There is no fatigue limit under corrosive conditions. • The most characteristic evidence of Corrosion fatigue is presence of multiple cracks.