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Coupling Alignment

  • Coupling Alignment (Temperature Adjustments) :The operating temperature of a pump and a motor are often different. The motor will run at a specific temperature, which is usually indicated, on the motors data plate, and the pumps temperature will depend on the temperature of the fluid being pumped. 
  • This change in temperature will cause the coupling to become misaligned at the units operating temperature. This situation has been compensated for. A few calculations will ensure that the coupling will be aligned when the pump is running. 
  • The formula for this is Coefficient of expansion X temperature rise X centerline. 
  • Coefficient of Expansion is the amount of expansion per unit length, per degree (F) rise or fall in temperature. 
  • Temperature rise is the difference between ambient temperature and running temperature of the pump or motor. Ambient temperature is the surrounding temperature. 
  • The center height is the center height of the pump and motor shafts.

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