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Ways In Selecting A Disc Coupling

Jan 26, 2021 | Uncategorized

The next is usually a sample application applied to illustrate the regular course of action for picking a Disc coupling. Any resemblance to any existing company?¡¥s application is neither intentional nor meant to resemble that company?¡¥s actual application.
Sample Application:
An organization has a compressor application using a 225 horsepower electrical motor running at 1,150 RPM to drive a 3 cylinder multi stage reciprocating air compressor. The electrical motor includes a 3-3/8 inch shaft using a 7/8 inch keyway as well as compressor features a 92mm shaft by using a 25mm keyway. The shaft separation is approximately seven inches concerning shaft ends with some potential to alter the motor location. The shafts possess a parallel misalignment/offset of approximately 1/32 of an inch.
Phase 1: The first stage should be to decide what coupling variety is always to be picked for this application. Because the SU Type coupling only supports
a single flex plane, it may only accommodate angular and axial misalignment, but not parallel misalignment. The subsequent preference can be to appear at an SX or DI Variety coupling. The six bolt SX Sort will accommodate the two parallel misalignment along with the defined shaft separation. The size will be determined by the selection torque and also the shaft diameters.
Step two: Next, determine the application torque and apply the support component to calculate the selection torque.The formula utilized to calculate torque is as follows:
Application Torque ( in¡§Clb ) = ( HP x 63025 )/RPM
or Nm = ( KW x 9550)/RPM
Plugging while in the numbers through the application description:
Application Torque ( in-lbs ) =(HP x 63025)/RPM = (225 x 63025)/1150 = twelve,331 in-lbs
Application Torque x Services Factor = Selection Torque
twelve,331 in-lbs x 3.0 = 36,993 in-lbs
Step 3: Make use of the SX coupling tables and note that the SX 202-6 is rated at 40,700 in-lbs, more than ample to deal with the variety torque calculated in phase 2. The SX202-6, having said that, will not help the 92mm shaft size. The following larger size coupling, the SX228-6, will support the 92mm shaft size as well as the shaft separation dimension (BSE) is six.88 inches, extremely near to the application?¡¥s wanted seven inch separation. The SX228-6 is rated at 62,000 in-lbs which may well seem to be excessive, on the other hand, the coupling dimension is important to handle the bore size.
Stage four: The SX228-6 coupling is rated for a highest unbalanced velocity of three,400 RPM, a lot more than sufficient to assistance the application pace of one,150 RPM.
Stage 5: To determine when the coupling will take care of the parallel misalignment, use the trig function of tan 1?? = offset allowed for one inch = 0.0174
Multiply the 0.0174 x the distance amongst disc packs or ??S?¡¥ dimension in the table on webpage D-13, or 5.50 inches.
The allowable parallel offset is 0.0174 x 5.50 = 0.096 inches. The utmost offset for your application is 1/32 inches (0.031), as a result this coupling can accommodate the parallel misalignment.
Note: It can be often advised to endeavor to set up the Ways In Selecting A Disc Coupling Disc%20couplingscoupling at roughly 20% on the allowable misalignment. For this coupling the installer should try to obtain superior than 0.020 parallel misalignment at the time of set up. This will likely enable for the further misalignment that should happen because the outcome of products settle and common products put on.

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