| It is important
to inspect chain slings regularly and to keep a record of individual chain
inspection. The following is a suggestion for such an inspection
system.
Before inspection:
Clean the chains so that marks, nicks, wear and other defects can be seen.
Each link should be inspected for the following danger signs:
1. Twists or bends
2. Nicks or gouges
3. Excessive wear
at bearing points
4. Stretch
5. Distorted or damaged
master links, coupling links or attachments especially spread in throat
opening of hooks.
Each link or attachment having
any defect listed above should be marked with paint to plainly indicate
rejection and elimination from service until properly repaired. |
|
Chain requires
only minimum maintenance:
1. Store chains on
a A-frame in a clean,dry place.
2. Oil chains before
prolonged storage.
3. Never anneal chain |
Determine wear
by measuring cross section at link ends. If worn to less than the
minimum thickness allowable, chain should be removed from service.
Chain
Size
|
Diameter
|
Maximum
Allowable Wear
|
Minimum Allowable
Wire Diameter
|
|
9/32"
|
.281
|
.046
|
.235
|
|
3/8"
|
.406
|
.078
|
.328
|
|
1/2"
|
.531
|
.109
|
.422
|
|
5/8"
|
.630
|
.140
|
.490
|
|
3/4"
|
.787
|
.156
|
.631
|
|
7/8"
|
.881
|
.171
|
.710
|
|
1"
|
1.000
|
.187
|
.813
|
|
|
When the chain
itself is heated to temperatures shown below, the Working Load Limits should
be reduced as indicated.
Grade 80 Chain
|
Temperature
|
Reduction of
Working Load Limit WHILE
AT Temperature
|
Reduction of
Working Load Limit AFTER
EXPOSURE
At Temperature
|
|
(°F)
|
(°C)
|
|
Below
|
Below
|
|
|
|
400
|
204
|
None
|
None
|
|
400
|
204
|
10%
|
None
|
|
500
|
260
|
15%
|
None
|
|
600
|
316
|
20%
|
5%
|
|
700
|
371
|
30%
|
10%
|
|
800
|
427
|
40%
|
15%
|
|
900
|
482
|
50%
|
20%
|
|
1000
|
538
|
60%
|
25%
|
Over
1000
|
Over
538
|
OSHA 1910.184
requires all slings exposed to temperatures over 1000°F to be removed
from service |
|
Greendale, WI 53129 
