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Quick-Check method for approximate maximum tension (Tm) used only on existing
conveyors which require power when loaded.
NOTE: Do not use for
decline belts.
Many small conveyors require more
carcass for load support and impact
than is required for maximum tension.
For that reason, the belt selection is
based primarily on load support, pulley
diameter, impact and cost. However,
during the investigation of such belts, it
is advisable to check the possibility that
maximum tension may be a factor.
In such cases, QUICK-CHECK
offers a quick, simple method of
approximating
the maximum tension.
If the result is low enough to show that
tension is not a factor, then no further
calculations are required. However, if the
result indicates tension may be a factor,
then more data should be gathered and
maximum tension calculated using the
appropriate formulas.
The appropriate maximum tension will
normally be higher than that obtained
through the regular formulas. To
determine the approximate maximum
tension using QUICK-CHECK:
IMPERIAL
1. Find the proper belt speed, type
of take-up, and type of pulley;
the corresponding number is the
approximate maximum tension
per motor horsepower.
2. Multiply this number (Tm,
approximate maximum tension
per motor horsepower) by motor
horsepower to obtain approximate
maximum tension in pounds.
3. Divide the approximate maximum
tension in pounds by the belt
width to obtain the approximate
required piw.
4. If the approximate piw is equal to
or greater than the tension rating
of the load support belt, then a more
accurate maximum tension should
be calculated. Contact your local
Continental ContiTech distributor.
METRIC
1. Find the proper belt speed, type
of take-up, and type of pulley;
the corresponding number is the
approximate maximum tension
per motor kilowatt.
2. Multiply this number (Tm,
approximate maximum tension
per motor kilowatt) by motor
kilowatts to obtain approximate
maximum tension in newtons.
3. Divide the approximate maximum
tension in newtons by the belt
width to obtain the approximate
required N/mm or kN/m.
4. If the approximate Tm is equal to
or greater than the tension rating
of the load support belt, than a
more accurate maximum tension
should be calculated. Contact your
local Continental ContiTech distributor.
Imperial Values
Quick-Check method for maximum tension — single pulley drives
Belt speed
"S"
(ft./min.)
Approx. “Tm”—lbs. per Motor HP (Power Requiring
Conveyors only) (10% Drive Losses)
Counterweight take-up Screw take-up
Lagged
pulley
Bare
pulley
Lagged
pulley
Bare
pulley
50
820
892
986
1070
100
410
446
493
535
150
273
297
329
356
200
206
224
248
268
250
164
179
198
224
300
136
148
164
178
350
117
127
141
153
400
102
111
123
133
450
91
99
110
119
500
83
90
100
108
550
75
81
90
97
600
69
75
83
90
650
64
69
77
83
700
59
65
72
77
750
55
60
67
72
Metric Values
Quick-Check method for maximum tension — single pulley drives
Belt speed
"S"
(ft./min.)
Approx. “Tm”—lbs. per Motor HP (Power Requiring
Conveyors only) (10% Drive Losses)
Counterweight take-up Screw take-up
Lagged
pulley
Bare
pulley
Lagged
pulley
Bare
pulley
0.25
4968
5400
5976
6480
0.50
2484
2700
2988
3240
0.75
1656
1800
1992
2160
1.00
1242
1350
1494
1620
1.25
994
1080
1195
1296
1.50
828
900
996
1080
1.75
710
771
854
926
2.00
641
675
747
810
2.25
552
600
664
720
2.50
497
540
598
648
2.75
452
491
543
589
3.00
414
450
498
540
3.25
382
415
460
498
3.50
355
386
427
463
3.75
331
360
398
432
4.00
310
337
374
405
4.25
292
318
352
381
4.50
276
300
332
360
40
Installation, Maintenance & Troubleshooting Guide
Quick Check