The force or pull required to move a conveyor includes the
pull necessary to move the weight of chain and material and
the frictional resistance of the chain parts on the runways.
The following formulas may be used in calculating the total
chain pull. The same formula applies in the case of single or
parallel strand chain conveyors, but in the case of parallel
strand conveyors, the pull per chain is one-half of the figure
calculated from the formula.