This tutorial is all about determining the length of your chain slings.
Chain sling capacity formula.
Rated capacity in tons of 2 000 lbs.
Wire rope and chain are the important part of the hoist which are closely bound up with the safe work load now let s talk about how to calculate the swl of ropes and chains.
We need to install a set of slings between the crane hook and a spreader bar which will create a 90 degree full included.
Safe working capacity 8 x 0 625 x 0 625 3 125 tons or 6 250 pounds the simple math for hooks a rule of thumb for the estimated capacity of a steel hook is to measure the minimum thickness d at the point where the inside of the hook starts its arc and use this simple formula to determine approximate safe working capacity.
This is due to the difficulty of rigging a quad leg chain sling so that all legs share the load equally.
Diameter in mm squared the weight in kg.
Always consider the sling angle when making a lift.
As an example a horizontal sling angle of 30 will increase the tension factor by 2 times therefore doubling the weight felt by the sling and all related rigging.
37 113 99 113.
Rated capacities shown apply only to 6x19 and 6x37 classification wire rope.
When our instructors conduct rigging courses they teach the participants a quick method to calculate the minimum size of length of slings for a given load using a formula which has been included at the bottom of our r ated capacity card.
Lightly oil grade 80 chain slings before prolonged storage.
Ensure that the load is evenly distributed on all sling legs.
Never heat treat grade 80 chain slings.
This method applies to all single double triple and quad legged chain slings.
Mophorn 5ft chain sling 5 16 x 5 double leg with grab hooks sling chain 3t capacity double leg chain sling grade 80 by mophorn 55 37 55.
Sling angles of less than 30 should not be used.
The angle of the sling can reduce the capacity of all the rigging due to sling tension.
Rated capacity working load limit for wire rope slingsas the angle of the sling leg decreases from 60 to 45 to 30 as shown in the capacity chart the rated capacity of the sling decreases.
All diameters are measured in millimetres mm.
When adjusting the working load limit of four legged chain slings the number of legs entered in the formula must be 3 not 4.
All weight are calculated in kilograms kg.
Ensure that the chain is free of twists and is protected from any sharp corners on the load.
Always inspect chain sling before use to ensure it is free from damage or wear.
