PACIFIC CONVEYORS LTD.
STANDARD PRODUCT CATALOGUE
engineered material
handling systems
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Technical Page 5  HORSEPOWER CALCULATIONS  
FOR BELT DRIVEN LIVE ROLLER CONVEYORS
Formula
PRODUCT WEIGHT (1) (lbs) Total weight of product on conveyor
+ BELT WEIGHT (lbs) weights and tables
+ ROLL WEIGHT (lbs) weights and tables 
+ DRIVE WEIGHT (lbs) Best estimate  (for small drives, use 250 lbs)
= SUBTOTAL (1) (lbs)  
FRICTION FACTOR (1) Belt driven live roller  0.10  weights and tables
Model 138LR  light duty = SUBTOTAL (1) (lbs) BELT PULL DUE TO PRODUCT IN MOTION
Model 196LR  medium duty PRODUCT WEIGHT (2) (lbs) Portion of weight of product to be accumulated
Model 196ZPA accumulator x FRICTION FACTOR (2) Equivalent to belt on steel slider tread (0.3)
Model 251CALR heavy duty = SUBTOTAL (2) (lbs) BELT PULL DUE TO ACCUMULATED PRODUCT
+ SUBTOTAL (1) (lbs) Calculated in previous lines
= TOTAL BELT PULL (lbs) TOTAL REQUIRED BELT PULL
x BELT SPEED (fpm)  
= WORK RATE (ft lbs/min) NOMINAL WORK RATE
x 1.25 contingency Contingency allowance for drive inefficiencies
x 1.25 contingency Contingency allowance for occasional overloads
divide by 33,000 (one horsepower = 33,000 ft lbs per minute

Do not accumulate on belt driven curves

= HORSE POWER ENERGY REQUIREMENT  1HP = 0.75 kw
Model 196LRC curve  * treat deflected loads, or product in contact with guides as accumulated

DOWNLOAD CALCULATOR * Zero pressure accumulators require no calculation for accumulated loads
  must have Excel on your device Assume that only half the product on an accumulator is in motion.
  * Treat all slave driven curves and spurs as one 10'0" section
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