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3<br />
To calculate the SWL of a sling needed to lift a load, divide the load by the angle factor and divide<br />
by the reeve factor.<br />
Formula <strong>for</strong> a calculator:<br />
SWL = weight ÷ angle factor ÷ reeve factor<br />
Formula can be written:<br />
SWL = weight<br />
angle factor x reeve factor<br />
For example: Two slings have a 60° angle between them and are both reeved around a 4 tonne<br />
square load. This means a factor of 1.73 <strong>for</strong> the angle and 0.5 <strong>for</strong> the reeve.<br />
Weight 4 tonnes<br />
Angle factor 1.73<br />
Reeve factor 0.5<br />
There<strong>for</strong>e:<br />
SWL = 4 ÷ 1.73 ÷ 0.5<br />
= 4.62 tonnes<br />
There<strong>for</strong>e use a sling with a lifting capacity greater than 4.62 tonnes.<br />
4<br />
To calculate the SWL of the sling needed to lift this load, divide the load by the angle factor and<br />
divide by the reeve factor.<br />
Formula <strong>for</strong> a calculator:<br />
SWL = weight ÷ angle factor ÷ reeve factor<br />
Formula can be written:<br />
SWL = weight<br />
angle factor x reeve factor<br />
For example: Two slings have a 60° angle between them are reeved around a 20 tonne round load.<br />
This means a factor of 1.73 <strong>for</strong> the angle and 0.75 <strong>for</strong> the reeve.<br />
Weight 20 tonnes<br />
Angle factor 1.73<br />
Reeve factor 0.75<br />
SWL = 20 ÷ 1.73 ÷ 0.75<br />
= 15.41 tonnes<br />
There<strong>for</strong>e, use a sling with a lifting<br />
capacity greater than 15.41 tonnes.<br />
Workplace Health and Safety Queensland (Department of Justice and Attorney-General)<br />
In<strong>for</strong>mation guide - Guide <strong>for</strong> <strong>doggers</strong><br />
PN10123 Last updated 15 July 2010<br />
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