Minimum Pully Diameter

Minimum Pully 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°)

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

Tensilie member material in belt longitudinal direction	material characteristic value
E (Polyester)	106
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% Pullery Group			over 30% to 80% Pullery Group			up to 30% Pullery 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