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Effect
of Angles on Sling Capacities
The rated
capacity of a multiple leg sling is directly affected by the
angle of the sling leg with the horizontal. As this angle decreases,
the stress on each leg increases with the same load. If the sling
angle is known, the capacity can be readily determined by multiplying
the sling's vertical capacity by the appropriate load angle factor
from the table at below:
| Sling
Angle |
Load
Angle Factor |
Example:
A
multiple leg sling with a rated capacity of 2000 lb. will have
a reduced capacity of 1000 lb. (2000 x .500) when sling legs
are at an angle of 60 degrees with vertical. |
| 0
(Vertical) |
1,000 |
|
| 75
degrees |
.966 |
|
| 60
degrees |
.866 |
|
| 45
degrees |
.707 |
|
| 30
degrees |
.500 |
|
| 15
degrees |
.259 |
|
Wire
Rope Sling Inspection
Conditions
such as the following should be sufficient reason for consideration
of sling replacement:
| 1. |
For
strand laid and single part slings, six (6) randomly distributed
broken wires in one rope lay, or three (3) broken wires in one
strand in one rope lay. |
| 2. |
For
cable laid and braided slings of less than 8 parts, twenty (20)
randomly distributed broken wires in one lay or braid, or one
(1) broken strand per sling. |
| 3. |
For
braided slings of 8 parts or more, forty (40) randomly distributed
broken wires in one braid, or two (2) broken strands per slings. |
| 4. |
Severe
localized abrasion or scraping. |
| 5. |
Kinking,
crushing, birdcaging or any other damage resulting in distortion
of the wire rope structure. |
| 6. |
Evidence
of heat damage or if a wire rope sling having a fiber core is
exposed to temperatures in excess of 200 degrees F. or if a wire
rope sling having a steel core is used at temperatures above
400 degrees F or below minus 60 degrees F. |
| 7. |
End
attachments that are cracked, deformed, or worn. |
| 8. |
Hooks
that have been opened more than 15% of the normal throat opening
measured at the narrowest point or twisted more than 10 degrees
from the plane of the unbent hook. |
| 9. |
Corrosion
of the rope or end attachments. |
| 10. |
Unlaying
or opening up of a tucked splice. |
TOP
P.O. Box 33170
5250 River Road
Cincinnati, OH 45233
Phone: (513) 941-2443
Fax: (513) 941-2445
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