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TECHNICAL  

MINIMUM PULLEY DIAMETERS (mm)
DTr*
Rate of utilization of the maximum permissible belt breaking strength**
over 60 to 100 %
over 30 to 60 %
up to 30 %
Pulley group
A
B
C
A
B
C
A
B
C
160
160
125
100
125
100
100
100
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
1400
1250
1400
1250
1000
1250
1250
1000
1800
1800
1600
1400
1600
1400
1250
1400
1400
1250
2000
2000
1800
1600
1800
1600
1400
1600
1600
1400
*
Pulley
 ** Pulley load factor
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VOLUME FLOW (m³/h)
Belt width
Idler length
Troughing angle of the belt
(mm)
(mm)
0°
20°
25°
30°
35°
40°
45°
500
200
39
72
79
85
90
94
97
650
250
69
132
145
155
164
171
176
800
315
108
207
226
243
257
268
276
1000
380
174
337
369
396
419
437
449
1200
465
256
493
540
580
614
640
658
1400
530
353
685
750
806
853
888
913
1600
600
466
907
993
1067
1128
1175
1208
1800
670
594
1160
1270
1365
1443
1502
1544
2000
740
739
1443
1581
1699
1795
1869
1920
2200
800
917
1802
1974
2121
2241
2332
2394
2400
870
1115
2196
2406
2585
2730
2840
2915
2600
940
1332
2628
2880
3094
3268
3399
3486
2800
1000
1568
3104
3402
3654
3859
4012
4113
3000
1070
1824
3615
3961
4255
4492
4670
4788
3200
1140
2099
4164
4563
4902
5174
5379
5513
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STEEL CORD CONVEYOR BELT TYPE CHART (X grade covers)
Rating
Typical cover gauge (mm)
Thickness (mm)
Weight (kg/m²)
St 500
4 + 4
10 
13
St 630
4 + 4
13
14
St 800
6 + 4
13
17
St 1000
6 + 4
14
18
St 1250
6 + 4
14
19
St 1600
8 + 6
17
21
St 2000
8 + 6
19
29
St 2500
10 + 8
25
38
St 3150
10 + 8
26
41
St 3500
10 + 8
26
43
St 4000
12 + 8
29
48
St 4500
12 + 8
30
51
St 5000
12 + 10
32
55
St 5400
12 + 10
33
56
St 6300
12 + 10
34
66
St 6800
12 + 10
36
68
St 7500
12 + 10
37
69
St 8500
14 + 12
40
76
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COEFFICIENTS OF FRICTION (m)
Condition
Steel pulley
PU lagging
Rubber lagging
Ceramic lagging
dry
0.35 - 0.4
0.35 - 0.4
0.4 - 0.45
0.4 - 0.45
wet (water)
0.1
0.35
0.35
 0.35 - 0.4
wet (soiled)
0.05 - 0.1
0.2
0.25 - 0.3
0.35
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BULK DENSITY (r)
Ash, dry
0.5 - 0.7
Ash, wet
0.9
Basalt
1.6
Bauxite, crushed
1.3
Cement
1.35
Clay, dry
1.8
Coal, r.o.m.
1.1 - 1.4
Coal, fine
0.7 - 0.9
Copper ore
2.15
Gravel
1.8 - 2.2
Gold ore
1.2
Lignite
0.65 - 0.85
Limestone
1.5 - 1.9
Iron ore
2.1
Mineral salt
1.0
Oil sand
1.5
Overburden
1.5 - 1.8
Phosphate
1.2 - 1.5
Potash
1.35
Rock debris
1.8
Salt
1.2 - 1.5
Sand, dry
1.6
Sand, wet
2.0
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COEFFICIENT FOR THE DETERMINATION OF THE VOLUME FLOW (jSt)
Gradient angle
2°
4°
6°
8°
10°
12°
14°
16°
18°
20°
Coefficient (jSt)
1.0
0.99
0.97
0.97
0.95
0.93
0.91
0.89
0.85
0.81
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DISTANCE BETWEEN BELT EDGE AND DEEPEST POINT OF TROUGH (mm)
Belt width
Idler length
Belt width on
Belt troughing angle
(mm)
(mm)
side idlers (mm)
25°
30°
35°
37,5°
40°
45°
500
200
150
63
75
86
91
96
106
650
250
200
85
100
115
122
129
141
800
315
243
102
121
139
148
156
171
1000
380
310
131
155
178
189
199
219
1200
465
368
155
184
211
224
236
260
1400
530
435
184
218
250
265
280
308
1600
600
500
211
250
287
304
321
354
1800
670
565
239
283
324
344
363
400
2000
740
630
266
315
361
384
405
445
2200
800
700
296
350
402
426
450
495
2400
870
765
323
383
439
466
492
541
2600
940
830
351
415
476
505
534
587
2800
1000
900
380
450
516
548
579
636
3000
1070
965
408
483
554
587
620
682
3200
1140
1030
435
515
591
627
662
728
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MINIMUM BELT FORCES TO ENSURE TRANSMISSION OF PERIPHERAL PULLEY FORCES
Coeff. of friction
170°
175°
180°
185°
190°
195°
200°
205°
210°
215°
220°
225°
230°
235°
240°
245°
0.05
6.25
6.06
5.88
5.71
5.55
5.39
5.24
5.10
4.97
4.85
4.72
4.61
4.50
4.39
4.29
4.20
0.10
2.90
2.80
2.71
2.62
2.54
2.47
2.39
2.32
2.26
2.20
2.14
2.08
2.02
1.97
1.92
1.87
0.15
1.78
1.72
1.66
1.60
1.55
1.50
1.45
1.41
1.36
1.32
1.28
1.25
1.21
1.18
1.14
1.11
0.20
1.23
1.19
1.14
1.10
1.06
1.03
0.99
0.96
0.92
0.89
0.87
0.84
0.81
0.79
0.76
0.74
0.25
0.91
0.87
0.84
0.81
0.77
0.75
0.72
0.69
0.67
0.64
0.62
0.60
0.58
0.56
0.54
0.52
0.30
0.70
0.67
0.64
0.61
0.59
0.56
0.54
0.52
0.50
0.48
0.46
0.44
0.43
0.41
0.40
0.38
0.35
0.55
0.52
0.50
0.48
0.46
0.44
0.42
0.40
0.38
0.37
0.35
0.34
0.33
0.31
0.30
0.29
0.40
0.44
0.42
0.40
0.38
0.36
0.34
0.33
0.31
0.30
0.29
0.27
0.26
0.25
0.24
0.23
0.22
0.45
0.36
0.34
0.32
0.31
0.29
0.28
0.26
0.25
0.24
0.23
0.22
0.21
0.20
0.19
0.18
0.17
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