Mich. Admin. Code R. 408.16336 - Chains; cables; wire ropes
Rule 6336.
(1)
A chain used for material handling and its component parts, other than alloy
steel chain having a minimum tensile strength of 125,000 pounds per square
inch, shall have a designed safety factor of not less than 5. Alloy chain shall
not be used in excess of the working load in straight tension for its size as
prescribed in Table 3 'Working Load.'
(2) Chain with bent, twisted, or elongated
links, or a hook that has been opened more than 15% at the throat from the
original set or twisted more than 10% from the plane of the unbent hook, shall
not be used until the defective links or hook is replaced.
(3) Cable, wire rope, and wire rope slings
shall have a designed safety factor of not less than 5.
(4) Wire rope or cable shall be inspected
when installed, and not less than monthly thereafter, when in use.
(5) Wire rope shall not be used if, in any
length of 8 diameters, the total number of visible broken wires exceeds 10% of
the total number of wires, or if the rope shows other signs of excessive wear,
corrosion, or defects.
TABLE 3
WORKING LOAD
| Nominal Size, Chain Bar, inch | Work Load, lb. Max. |
| 1/4 | 3,250 |
| 3/8 | 6,600 |
| 1/2 | 11,250 |
| 5/8 | 16,500 |
| 3/4 | 23,000 |
| 7/8 | 28.500 |
| 1 | 38,750 |
| 1 1/8 | 44,500 |
| 1 1/4 | 57,500 |
| 1 3/8 | 67,000 |
| 1 1/2 | 80,000 |
| 1 3/4 | 100,000 |
Notes
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