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1) Double Branch Slings:
For all the angles between branches from 0-90° (0-45° to the vertical) WLL=1.4 x WLL of a single branch made from similar chain. When additionally marked for angles between branches of 90-120° (45-60° to the vertical) WLL = 1 X WLL of a single branch made from similar chain. |
2) Three and four branch slings:
For all angles between branches from 0-90° (0-45° to the vertical) WLL = 2.1 X WLL of a single branch made from similar chain. When additionally marked for angles between branches of 90-120° (45-60° to the vertical) WLL = 1.5 X WLL of a single branch made from similar chain. Note: In the case of a three branch sling the angle between branches shall be taken as twice the angle to the vertical, that is 2 X single leg capacity. |
| ALTERNATIVELY CONSIDER THE FOLLOWING METHOD: |
| A) For two leg (branch) slings multiply the capacity of single leg sling by 1.4 to obtain SWL of two legs at a included angle of 90°. Table determining the SWL of 2 legs with the given chain
dia. |
Single Leg chain say
Multiply by SWL of 2 legs
12 mm grade T. (80) 1.4 times
at 90° angle
SWL 5 Tons >
X =
i.e. 7 Tons |
|
| B) For 3&4 leg (branch) slings multiply the capacity of single leg sling by 2.1 to obtain SWL at a included angle of 90° |
Single Leg chain say Multiply by
SWL of 2 legs
16 mm grade T. (80) 2.1 times
at 90° angle
SWL 8 Tons
>
X =
i.e. 16.8 Tons |
|
Important Notes:
Working load limits of chain & chain slings have been calculated on the basis of a minimum breaking load / working load relationship of 4:1. Certain users prefer a higher factorfor safety which can be considered.
All reference to angles between legs assume that the legs are symmetrically disposed e.g. in the case of a sling rated at angles of 0 to 90°, no leg is disposed at more than 45° from vertical. |
The listed working loads should be reduced by at least 20% when the sling is being used in a choker hitch configuration. |
Chocker Slings
Type LTC - 23 |
