The load chart below has been prepared for 6 x 24 1570 grade galvanised steel wire.
Wire rope sling capacity calculation formula.
Whenever you lift a load with the legs of a sling at an angle you can calculate the actual load per leg by using the following three step formula.
If the calculated head room is greater than the available head room try typing in a smaller angle for known angle a.
F w 2 where.
For instance try 45 or 30 degrees.
Single part body mechanical splice slings have a higher rated capacity than hand spliced slings.
Millimetres mm and multiply by 8.
Diameter in mm squared the weight in kg.
Swl 12 12 8 1152kgs.
Rope dia d 12 mm swl kg d2 mm x8 d mm x d mm x 8 12 x 12 x 8 1152 kg swl t 1 15 tonnes the above equation can be reversed to calculate the diameter d in millimetres of fswr needed to lift a given load.
The rated capacity of a wire rope sling is based upon the minimum breaking force mbf of the wire rope used.
Example for 12 mm dia wire rope.
Three adjacent strands to one.
Rated capacities based on pin diameter no larger that natural eye width or less than the nominal sling diameter.
The rated capacity is based both on sling fabrication components minimum breaking force of rope used splicing ef ciency number of parts of rope in sling and number of sling legs and sling application components angle of legs type of hitch d d ratios etc if you are using one wire rope sling in a vertical.
All weight are calculated in kilograms kg.
Swl kg d2 mm x 8 for example.
For wire rope fs is 6 for general purpose and 7 for heavy industry.
All diameters are measured in millimetres mm.
The rope material with the loading factor to produce a safe working load chart.
Forsling swl depends on the length of the sling leg l and the headroom between the hook and the load h.
As we all known.
F force in rope n lb f w m g weight of body n lb f m mass of body kg slugs.
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.
The safe working load for various rope sizes and slinging configurations has been combined to enable the swl to be taken directly from the chart.
Example capacity of a single rope or wire.
Rated capacities basket hitch based on d d ratio of 25.
Rated capacities shown apply only to 6x19 and 6x37 classification wire rope.
Swl wire rope dia 2 8 kgs.
Wire rope sling selection rated capacities design factors and d d ratios.
A thumb rule formula is.
The capacity of a single rope that follows a vertical line is 100 since the reduction factor is 1.
To calculate the swl in kilograms of fswr square the rope diameter d in.
If the weight of a body is w the load in the wire is.
The center of the rope and eye.
