Effect of Angles on Sling Capacities

Effect of Angles on Sling Capacities

effect on angles on sling capacities diagram

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:

SlingAngle LoadAngle Factor Example:A multiple leg sling with a rated capacity of 2000 lb. will havea reduced capacity of 1000 lb. (2000 x .500) when sling legs are at an angle of 60 degrees with vertical.
0(Vertical) 1,000
75degrees .966
60degrees .866
45degrees .707
30degrees .500
15degrees .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 distributedbroken wires in one rope lay, or three (3) broken wires in onestrand 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 distributedbroken 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 distortionof the wire rope structure.
6. Evidence of heat damage or if a wire rope sling having a fiber core isexposed to temperatures in excess of 200 degrees F. or if a wirerope 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 openingmeasured at the narrowest point or twisted more than 10 degreesfrom the plane of the unbent hook.
9. Corrosion of the rope or end attachments.
10. Unlaying or opening up of a tucked splice.

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