Selection Guidelines Required Information 1. Number of hours of daily operation 2. Classification of load and prime mover 3. Horsepower or required torque to be transmitted and shaft speed in revolutions/minute 4. Diameter of both shafts
Method for Selection 1. Based on the operating conditions, determine the Service Factor, using Table 1. 2. Obtain the design horsepower by multiplying the horsepower to be transmitted by the Service Factor. 3. With the required rpm, choose the coupling that satisfies the horsepower from the Horsepower Rating, shown in Table 2. 4. When the required shaft diameter exceeds the maximum bore diameter of the coupling you have chosen, use a coupling that is one size larger. 5. In the low-speed range, the shearing pressure might be too great when using a standard key. In this case, calculate the key shearing pressure to determine if it is necessary to use a special key or spline bore. 6. Note the lubrication system required and select the coupling cover as necessary. In all applications, use of a coupling cover will provide quieter running, longer life, and safer operation.
Table 1. Service Factor
Source of Power Electric Reciprocating Reciprocating motors or engines engines steam 4 or more less than
Load Classification
turbines
cylinders
4 cylinders
Uniform load, little shock, low starting torque, no reversing Moderate fluctuation of load, moderate shock, no reversing (for most common applications) Large fluctuations of load, heavy shock, reversal under load, full load starting
1.0
1.5
2.0
1.5
2.0
2.5
2.0
2.5
3.0
Note: Additional service factor for Roller Chain
Coupling by operating hours (at 50 r/min and more) 8 hours to 16 hours/day - 0.5 16 hours or more/day - 1.0
Table 2. HP Rating Table Cplg
Speed of rotation (rpm)
Max Allowable Transmissible Torque at Below 50 rpm (in lbs.)
No.
1 5 10 25 50 100 200 300 400 500 600 800 1000 1200 1500 1800 2000 2500 3000 3600 4000 4800
4012 1921 0.03 .015 0.30 0.78 1.54 2.32 3.53 4.64 5.57 6.65 7.60 9.40 11.44 12.98 15.56 18.37 19.85 24.00 27.76 32.32 35.32 41.30 4016 3416 0.05 0.28 0.55 1.38 2.76 4.14 6.29 8.27 9.94 11.87 13.54 6.76 20.52 23.20 28.16 32.72 35.27 42.78 49.62 57.66 62.89 73.62 5016 6505 0.11 0.52 1.05 2.61 5.24 7.86 11.96 15.69 18.91 22.52 25.75 31.92 38.76 44.12 53.51 62.22 67.05 81.27 94.41 109 5018 8240 0.13 0.67 1.33 3.33 6.64 9.96 15.15 19.98 23.87 28.56 32.72 40.36 49.08 55.79 67.72 78.85 85.02 103 120 6018 15489 0.24 1.25 2.51 6.26 12.51 18.77 28.56 37.55 45.06 53.77 61.55 76.17 92.66 105 128 149 161 194 6020 17868 0.28 1.43 2.88 7.21 14.34 21.55 23.72 43.17 51.85 61.90 70.84 87.59 106.58 121 147 171 185 223 8018 34341 0.55 2.78 5.55 13.81 27.76 41.57 63.30 83.28 99.91 119 135 169 205 233 283 330 355 8020 41027 0.66 3.30 6.61 16.49 33.05 49.55 75.17 99.22 118.54 141.3 162 201 244 278 337 393 423 10020 77710 1.25 6.25 12.51 31.25 62.49 93.87 142 188 225 268 307 380 463 526 638 743 Lubrication System 1 2 3
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