Mich. Admin. Code R. 408.15225 - Chain, chain slings, and chain fittings
Rule 5225.
(1)
A chain and its component parts, other than alloy steel chain having a minimum
tensile strength of 125,000 pounds per square inch, shall have a 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 1.
(2) A chain used in load-carrying service
shall be inspected before initial use and weekly thereafter. Chain with bent,
twisted, or elongated links or hook that has been open 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 part is replaced.
(3) A bolt or nail shall not be used to
shorten or join links together.
(4)
Installation, inspection, maintenance, repair, and testing of chains shall be
done only by an employee qualified to do such work.
(5) Proper storage shall be provided for
slings while not in use.
(6) If, at
any time, any 3-foot length of chain is found to have stretched 1/3 the length
of a link shall be discarded.
(7)
Table 1 reads as follows:
|
Table 1 Working load Single chain |
|
|
Nominal Size, Chain Bar, In. |
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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