Dear Mr.C.R.Saini,
You may refer IS 3832 (Attached).
ANNEX A " RECOMMENDATIONS FOR SAFE USE AND MAINTENANCE OF HAND-OPERATED CHAIN PULLEY BLOCKS" (Page 9 of attachment).
And for more you may consult your vendor.
From India, Vapi
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Napo-maintenanc e-02-hidden-haz ard-eng.zip
Issues and concerns in the implementation and maintenance of HRIS_IIM Ahmedabad.pdf