To optimize a belt conveyor system with regard to
correct and satisfactory belt tracking, the maximum
belt sag hrel, in relation to the particular carrying idler
spacing, should have values limited to 1% in a
stationary operating state; in the non stationary
operating state, a larger value is allowable. The sag
should then be less, the greater the conveying speed
and the lumpier the load. From this, the resulting
minimum belt tensions required are as follows