HRC Flexible Shaft Couplings Selection Procedure
Table 1 – Service Factors
| Type of Load | Driven | Driver | ||
|---|---|---|---|---|
| Electric motors, Light Turbines | Internal Combustion Engine >=4 cylinders | Internal Combustion Engine 1 – 3 cylinders | ||
| Uniform No Vibration | Agitators, conveyors, centrifugal pumps and compressors, centrifugal fans, generators and machine tools | 1 | 1.4 | 1.8 |
| Moderate No Vibration | Agitators, conveyors, hoisting equipment, bucket elevators, textile machines, mixers, printing machinery, sawmill machinery, rotary pumps | 1.4 | 2 | 2.4 |
| Substantial Vibrations | Hoisting equipment, calendars, crushers, dredgers, revolving furnaces, print presses, cutting presses, rotary compressors | 2 | 2.4 | 2.8 |
| HeavyShocks & Vibration | Crushers, extruders, rubber mixers, reciprocating pumps, and conveyors, reciprocating compressors, vibrating screens | 2.4 | 2.8 | 3.2 |
Table 2 – Operating Hours Factor
| > | – | 2 | 8 | 16 |
|---|---|---|---|---|
| <= | 2 | 8 | 16 | – |
| L | 0.9 | 1 | 1.1 | 1.2 |
Table 3 – Starting Frequency Factor
| > | – | 1 | 30 | 60 |
|---|---|---|---|---|
| <= | 1 | 30 | 60 | – |
| S | 1 | 1.2 | 1.3 | 1.5 |
Coupling Selection Procedure
- Select Service Factor (Table 1).
- Nominal power multiplied by Service Factor equals temporary designed power K
- Designed power should then be multiplied by Factor L (Table 2) and S (Table 3).
- K x L x S gives the design power, which is used for coupling selection in Table 4.
- Check from dimensional tables that chosen coupling has room to be mounted.
Table 4 – Size of Coupling
| rpm | KW | |||||||
|---|---|---|---|---|---|---|---|---|
| 7 | 9 | 11 | 13 | 15 | 18 | 23 | 28 | |
| 100 | 0.35 | 0.88 | 1.75 | 3.44 | 6.59 | 10.43 | 22.00 | 34.65 |
| 200 | 0.69 | 1.75 | 3.52 | 6.88 | 13.18 | 20.86 | 44.02 | 69.30 |
| 400 | 1.39 | 3.51 | 7.04 | 13.77 | 26.37 | 41.72 | 88.04 | 138.60 |
| 600 | 2.08 | 5.25 | 10.55 | 20.65 | 39.55 | 62.58 | 132.06 | 207.90 |
| 800 | 2.78 | 7.00 | 14.07 | 27.53 | 52.73 | 83.44 | 176.08 | 277.20 |
| 1000 | 3.47 | 8.75 | 17.59 | 34.42 | 65.92 | 104.30 | 220.10 | 346.50 |
| 1200 | 4.16 | 10.50 | 21.11 | 41.30 | 79.10 | 125.20 | 264.12 | 415.80 |
| 1400 | 4.86 | 12.25 | 24.62 | 48.18 | 92.28 | 146.02 | 308.13 | 485.10 |
| 1600 | 5.55 | 14.00 | 27.14 | 55.07 | 105.47 | 166.88 | 352.15 | 554.10 |
| 1800 | 6.25 | 15.76 | 31.66 | 61.95 | 118.65 | 187.74 | 396.17 | 623.70 |
| 2000 | 6.94 | 17.51 | 35.18 | 68.83 | 131.83 | 208.60 | 440.19 | 693.00 |
| 2200 | 7.64 | 19.26 | 38.69 | 75.72 | 145.01 | 229.46 | 484.21 | 762.30 |
| 2400 | 8.33 | 21.00 | 42.21 | 82.60 | 158.20 | 250.32 | 528.23 | |
| 2800 | 9.72 | 24.51 | 49.25 | 96.37 | 184.57 | 292.04 | ||
| 3000 | 10.41 | 26.26 | 52.76 | 103.25 | 197.75 | 312.90 | ||
| 3500 | 12.15 | 30.64 | 61.56 | 120.46 | 230.71 | |||
| 4000 | 13.88 | 35.01 | 70.35 | 136.67 | ||||
| 4500 | 15.62 | 39.39 | 79.14 | |||||
| 5000 | 17.35 | 43.76 | 87.94 | |||||
| 5500 | 19.09 | 48.14 | ||||||
| 6000 | 20.82 | 52.52 | ||||||
| 6500 | 25.56 | |||||||
| 7000 | 24.30 | |||||||
| 7500 | 26.03 | |||||||
Dynamic Balance Required
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