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Coupling Selection
SELECTION PROCEDURE



  1. Calculate HP/100 RPM:
    HP/100 RPM = (Horsepower x 100)/ RPM
  2. Determine service factor from table on page E-15. If not listed, see load classification table below. Remember to consider both driver and driven equipment and temperature limitations.
  3. Multiply HP/100 RPM by the service factor to get equivalent HP/100 RPM.
  4. Select coupling size from Table 1 with a rating equal to or greater than the equivalent HP/100 RPM determined in step 3.
  5. Be sure that the operating speed of the coupling does not exceed maximum RPM listed on pages E-4 through E-7.
  6. Select desired hub type and check maximum allowable coupling bore on page E-16.

OR

  1. Calculate operating torque (63,000 x H) / RPM
  2. Multiply operating torque by service factor obtained from table on page 15.
  3. Select coupling size from Table 2 with a capacity equal to or greater than determined in step 2.
  4. Follow steps 5 and 6 above.
Table 1

Size

Equivalent
HP/100 RPM

Standard

Spacer

E2
E3
E4
E5
E10		 ES2
ES3
ES4
ES5
ES10		 .30
.58
.88
1.48
2.30
E20
E30
E40
E50
E60		 ES20
ES30
ES40
ES50
ES60		 3.65
5.79
8.85
12.14
19.84
E70
E80
E100
E120
E140		 ES70
ES80
NA
NA
NA		 35.12
62.70
135
270
540


Table 2
Torque Capacity

Size

Continuous
Torque (In. Lbs.)

 Size

Continuous
Torque (In. Lbs.)

2
3
4
5
10
20
30		 190
365
550
925
1,450
2,300
3,650		 40
50
60
70
80
100
120
140		 5,500
7,650
12,500
22,125
39,500
85,050
170,100
340,200


Service Factors

SERVICE FACTORS are means of classifying different equipment and applications into various load classifications. Due to variations in application of equipment, service factors are used to adjust equipment ratings to accommodate for variable loading conditions. This is a general guide. More specific factors are given on page 15.

Load Classifications Service
Factors
Continuos service and running loads vary slightly 10
Torque loading varies during operation of equipment. 15
Torque varies during operation, Ferquent stop/start cycles are encountered 20
For shock loading nad substantial torque variations. 25
For heavy shock loading or light reversing drives 30
Reversing torque loads not necesarily means reversal of rotation. Depending on the severity of torque such loads must be classified between "medium and "extreme" Consult Rexnord
 Omega Element
Temperature Range
(Ambient)
-40°F +200°F

to

-40°C +93°C


High Temperature
Service Factor
Adjustment*
Ambient Temp. S.F. Adjust.
+150°F (66°C)
+165°F (74°C)
+180°F (82°C)
+200°F (93°C)		 +0.25
+0.50
+0.75
+1.00

* In general, the service factor adjustment for high temperature is in addition to the service factor consideration for the driver and driven equipment. However, if high temperatures are typical for a specific application, maximum temperature consideration is incorporated into the "typical" service factor listing on page E-15. I.E. Steel mill runout tables.

E-14
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