12 CRR-NY 23-6.2NY-CRR
12 CRR-NY 23-6.2
12 CRR-NY 23-6.2
23-6.2 Rigging, rope and chains for material hoists.
(a) Hoisting rope.
(1) Types required.
Only wire rope of the improved plow steel classification or equivalent having a safety factor of not less than six shall be used with power-driven hoisting machinery, except for winchheads or capstan hoists where fibre rope may be used.
(2) Fibre rope.
(i) Fibre rope shall be first grade manila hemp or synthetic fibre. Means to prevent chafing shall be provided where necessary. Proper size blocks to accommodate the rope shall be used. Fibre rope shall be protected where acid or any other harmful or corrosive agent or chemical is used. All fibre rope shall be stored in a dry condition and in a dry place protected from the elements.
(ii) Fibre rope that is unsound in any way or that shows the effects of severe wear, deterioration or abrasion shall not be used and shall be removed from the job site. Frozen rope shall be thawed before being used.
(3) Wire rope.
(i) Wire rope shall be so handled and stored as to prevent kinks and shall be maintained lubricated to prevent corrosion. Wire rope that is kinked shall not be used on any material hoist. Wire rope shall be discarded and replaced when more than 10 percent of the total wires of any lay are broken. A rope lay is that distance measured along the rope in which one strand makes a complete revolution around the rope axis. Wire rope shall be discarded and replaced when the wires on the crown of the strand are worn down to less than 60 percent of their original cross-sectional area, when visual inspection indicates marked signs of corrosion, deterioration or abrasion and when any combination of broken wires and abrasion has reduced the original strength of the rope to 80 percent or less.
(ii) The ends of wire rope shall be securely attached to the hoist drums and at least four turns of rope shall remain on each drum at all times.
Exception:
Attachment of the rope to the hoist drum shall not be required on traction type hoists.
(iii) Means shall be provided to prevent accidental contact with or damage to any hoisting rope. Such means shall consist of substantial covering, fencing or guarding by location.
(4) Wire rope fastenings.
(i) Wire rope fastenings shall consist of zinc-filled sockets, wedge sockets with at least one rope clip above each socket, eye-splices with pear-shaped thimbles to fit the rope, proper size thimbles with rope clips or other approved fastenings.
(ii) Where clips are used as fastenings, the number used shall be in accordance with Table XVI of this Subpart.
(iii) The spacing between clips shall be at least six times the diameter of the rope. The U-bolts of clips shall be placed over the short ends of the ropes.
TABLE XVI ROPE CLIP REQUIREMENTS
| Rope diameter | Minimum number of clips |
|---|---|
Up to and including 7/16 inch | 2 |
Up to and including ⅝ inch | 3 |
Up to and including 1 inch | 4 |
Up to and including 1 ¼ inches | 5 |
Up to and including 1 ⅝ inches | 6 |
Up to and including 1 ¾ inches | 7 |
Up to and including 2 ½ inches | 8 |
Up to and including 3 inches | 9 |
(b) Sheaves.
Load-bearing sheaves for wire rope shall be of proper diameter and grooving to accommodate the rope but in no case shall such diameter be less than 20 times the diameter of the rope. Sheaves shall be maintained properly lubricated. Sheaves and blocks that are so excessively worn, damaged, deteriorated or otherwise defective as to cause or threaten to cause failure of the equipment shall not be used. Sheaves intended for use with fibre rope shall not be used with wire rope.
(c) Fittings.
All hooks, shackles and other fittings subject to tension or shear shall be drop-forged. The use of deformed or damaged hooks, shackles, chains or other fittings is prohibited. All suspended pulley blocks, sheaves, well wheels or similar devices shall be moused or securely fastened or safety hooks shall be used.
(d) Use of chains.
(1) Chains shall not be used as slings in hoisting operations except for the raising or lowering of wooden piles, large timbers, large pieces of masonry or large stones.
(2) Chains shall not be knotted nor shall they be shortened or spliced by the use of nails or bolts.
(3) Defective chains shall not be used.
(e) Heat treating of chains.
The annealing or normalizing of chains shall be performed only by the manufacturer or his authorized agent.
12 CRR-NY 23-6.2
Current through March 15, 2022
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