VfI9ɃSELETIONɃ#fIDE
Coupling Selection Formula
INFORMATION NEEDED TO SIZE A COUPLING:
\ Driver HP \ Operating RPM \ Service Factor \ DBSE (Distance Between Shaft Ends) \ Shaft Diameters
DRIVER F1
SF
DRIVER F2
SF
ELECTRIC MOTOR
GENERATORS, GEAR BOXES, LIGHT DUTY AGITATORS & CONVEYORS, STOKERS
1.0
1.0
GAS OR STEAM TURBINE
CENTRIFUGAL PUMPS, COMPRESSORS, BLOWERS, FANS, ETC.
1.0
1.0
GEAR BOX INCREASER/REDUCER
RECIPROCATING PUMPS, COMPRESSORS, FEEDERS, FREQUENT STOPS/STARTS, ETC.
1.0
2.0
GAS OR DIESEL ENGINE 4+ CYL
PULP & PAPER MILL EQUIPMENT (REFER TO MILL STANDARD COUPLING SF GUIDE)
3.0
1-3
GAS OR DIESEL ENGINE 1-3 CYL
STEEL MILL EQUIPMENT (REFER TO MILL STANDARD COUPLING SF GUIDE)
4.0
1-3
ForɃaɃom×leteɃlistɃo¢ɃservieɃ¢atorsɍɃre¢ereneɃ×a£eɃǿǼɃo¢ɃtheɃatalo£Ɍ
HP/100 RPM Method:
Transmitted Torque Method:
1. Obtain Service Factor
1. Obtain Service Factor
(SF)ɃSFɃʨɃFǼɃwɃF2Ƀ(NotɃtoɃExeeɃǿ)
(SF)ɃSFɃʨɃFǼɃwɃF2Ƀ(NotɃtoɃExeeɃǿ)
2. Determine HP/100 RPM as Follows:
2. Determine Torque as Follows:
HTəǼǻǻɃRTMɃʨɃHTɃTransmitteɃwɃǼǻǻɃwɃSF RTM
TorÙueɃ(inɃlbs)ɃʨɃHTɃTransmitteɃwɃȁ3ǻ2ȀɃwɃSF RTM
3. Reference the appropriate insert table depending on coupling type and choose coupling size that has a higher HP/100 RPM than what was calculated.
3. Reference the appropriate insert table depending on coupling type and choose coupling size that has a higher torque rating than what was calculated.
4. Check maximum coupling speed rating and compare to the coupling application speed.
4. Check maximum coupling speed rating and compare to the coupling application speed.
5. Compare the shaft sizes of the driver and driven equipment with the maximum bore of the selected coupling series and size.
5. Compare the shaft sizes of the driver and driven equipment with the maximum bore of the selected coupling series and size.
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