IS 12735 : 1994 Wire rope slings – safety criteria and inspection procedures for use Part 1 Use of wire ropes

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Use of wire rope slings
Before lifting a load
  1. Load suitable for lifting wire rope sling and lugs and eye bolts should be used
  2. The mass of the load to be lifted shall be assessed (see annex B). IF mass is not identified it should be assessed by person responsible for lift
  3. Suitable sling shall be chosen based on WLL ( the effective diameters of pins, hooks or other components over which soft eyes are used shall not be less than twice the rope diameter.)
  4. Slings considered not safe for use shall be withdrawn from service immediately (see clause 5).
  5. Centre of gravity to be assessed and the load to be toppled
  6. load contains no loose accessories. If contains attach the same
Fitting the Sling When fitt;ng the sling, it is necessary to ensure that

  a) sling legs are free of any tendency to kink;

  b) the terminations are properly seated without over-Crowding;

  c) the relevant leg angle does not exceed that for which the sling is rated and marked;

 d) the sling is not bent around any sharp corners that might damage the sling or reduce its effective strength where necessary/, suitable packing pieces should be used;

NOTES

     1 A sharp corner IS considered to have a radius of curvature of

less than the rope diameter.

    2 When a rope is bent over Its own diameter, It can lose 50 % of its original strength.

e) and, when using a choke hitch, to ensure that

        1) the angle of choke is allowed to form itself naturally and is not forced,

        2) a thimble or stirrup is used, where practicable, at the eye to reduce damage to the rope and thereby prolong the life of both the eye and the main part of the rope;

f) a sling in choke hitch is not used to turn, rotate or drag a load unless special precautions are taken

g) a tag line(s) or control rope(s) is available to assist in the

control of the swing or rotation of the load.

Raising or lowering the load
  1. a recognized code of signals is used
  2. There are no obstacles and sufficient height to lift
  3. Person concerned can watch and communicate and signal to be given by one person only
  4. All persons stay clear of load and special precautions to be taken is person stays close by
  5. Load to be raised staedily
Precautions a) no one shall be allowed to ride on the load;

b) a suspended load shall not be left unattended;

c) slings shall not be dragged along the floor;

d) the slings shall not be unnecessarily exposed to corrosive liquids, solids or vapours;

e) if the sling is to be used in an environment where the temperature exceeds 100 OC, advice of the sling manufacturer shall be sought.

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