V-Belt Service Factors Table Chart

V and Flat Belt Design and Engineering Data

Service Factors for V-Belts

The selection of a V-belt drive for any application should be based on the nature of the load and the type of driving unit. Service Factors for different kinds of driven machines combined with different types of driving units are shown in the table below. The driven machines are representative examples only. Select a driven machine whose load characteristics most closely ressemble those of the machine being considered. Multiply the rated motor power or power demand of the driven unit by the selected service factor to obtain the “design power”

TYPE OF DRIVEN MACHINES
Type of Driving Device
AC Motors: Normal Torque, Squirrel Cage, Synchronous and Split Phase. DC Motors: Shunt Wound, Multiple Cylinder Internal Combustion Engines.
AC Motors: High Torque, High Split, Repulsion-Induction, Single Phase Series Wound and Compound Wound, Single Cylinder Internal Combustion Engines. Line Shafts. Clutches
Intermittent Service (3-5 Hours Daily or Seasonal)
Normal Service (8-10 Hours Daily
Continuous Service (16-24 Hours Daily)
Intermittent Service (3-5 Hours Daily or Seasonal)
Normal Service (8-10 Hours Daily)
Continuous Service (16-24 Hours Daily)
Agitators for Liquids
Blowers and Exhausters
Centrifugal Pumps and Compressors
Fans up to 10 HP Light
Duty Conveyors
1.0
1.1
1.2
1.1
1.2
1.3
Belt Conveyor for Sand, Grain, etc.
Dough Mixers
Fans Over 10 HP
Generators
Line Shafts
Laundry Machinery
Machine Tools
Punches-Presses-Shears
Printing Machinery
Positive Displacement Rotary Pumps
Revolving and Vibrating Screens
1.1
1.2
1.3
1.2
1.3
1.4
Brick Machinery
Bucket Elevators
Exciters
Piston Compressors
Conveyors (Drag-Pan-Screw)
Hammer Mills
Paper Mill Beaters
Piston Pumps
Positive Displacement Blowers
Pulverizers
Saw Mill and Woodworking Machinery
Textile Machinery
1.2
1.3
1.4
1.4
1.5
1.6
Crushers (Gyratory-Jaw-Roll)
Mills (Ball-Rod-Tube)
Hoists
Rubber Calenders-Extruders-Mills
1.3
1.4
1.5
1.5
1.6
1.8

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