The distance between lift points refers to the spacing or separation between the points at which a load is being lifted or supported. In rigging, the distance between lift points can be critical because it affects the distribution of weight and tension on the lifting equipment and the stability of the load. We can calculate the maximum lift point distance by multiplying the sling length times the sling factor for a given angle. In the examples below, the lift points distance is calculated for sling angles of 30°, 45°, and 60° respectively. Take a moment to go over the calculations, and practice along, so that you get familiar with this process.
Lift Points Distance (LPD) = Sling Length (SL) X Sling Factor (SF)
(Hint: Use your sling angle table for Sling Factors)
Calculate for SL = 2’2” @ 30°
LPD = SL x SF
LPD = 2’ 2” x 2
LPD = 2.17’ x 2
LPD = 4.34’
LPD = 4’ 4”
Calculate for SL = 3’ @ 45°
LPD = SL x SF
LPD = 3’ x 1.41
LPD = 3’ x 1.41
LPD = 4.23’
LPD = 4’ 3”
Calculate for SL = 3’6” @ 60°
LPD = SL x SF
LPD = 3’ 6” x 1.15
LPD = 3.5’ x 1.15
LPD = 4.02’
LPD = 4’