Minimum Pulley Diameter

Technical Information

Minimum Pulley Diameters (to DIN 22101)

The pulley diameters in a belt conveyor system depend on the design, on strains and on the type of splice of the conveyor belt. For determining the minimum diameters, the following pulley groups will be distinguished:

  • Group A: Drive pulley and other pulleys in the range of higher belt tensions
  • Group B: Deflection pulleys in the range of lower belt tensions
  • Group C: Snub pulleys (change in belt moving direction = 30°)

Minimum Pulley Diameter – Phoenix Conveyor Belt

The minimum pulley diameter for Group A pulleys can be roughly determined by utilizing the thickness value of the tensile member in the belt as follows:

(DTR min)GR.A = Material Characteristic Value dGK

Tensile member material in belt longitudinal direction material characteristic value
E (Polyester) 108
P (Polyamide) 90
St (Steel cables) 145

A pulley diameter so obtained shall be rounded up to the next higher value of the table below, in which there are shown for each minimum values for group b and C, too.

Minimum pulley diameter DTR min without lining (Quoted in mm) depending on utilizing the admissible tension in the steady operation state.

(DTR min)GR.A
after rounding up
Utilization of the highest admissible belt tension
over 60% to 100% Pulley Group over 30% to 80% Pulley Group up to 30% Pulley Group
A B C A B C A B C
200 200 160 125 160 125 100 125 125 100
250 250 200 160 200 160 125 160 160 125
315 315 250 200 250 200 160 200 200 160
400 400 315 250 315 250 200 250 250 200
500 500 400 315 400 315 250 315 315 250
630 630 500 400 500 400 315 400 400 315
800 800 630 500 630 500 400 500 500 400
1000 1000 800 630 800 630 500 630 630 500
1250 1250 1000 800 1000 800 630 800 800 630
1400 1400 1250 1000 1250 1000 800 1000 1000 800
1600 1600 1250 1000 1250 1000 800 1000 1000 800
1800 1800 1400 1250 1400 1250 1000 1250 1250 1000
2000 2000 1600 1250 1600 1250 1000 1250 1250 1000
Minimum Pulley Diameter – Phoenix Conveyor Belt