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A drive retrofitted to replace a throttle valve should be checked for

  • A.the number of poles of the existing machine
  • B.the minimum speed at which the process still functions
  • C.the maximum speed the machine is able to reach
  • D.the moment of inertia of the pump impeller

Answer: B

A pump slowed too far cannot generate the static head at all and delivers nothing, whatever the valve position, so there is a floor below which the saving is unavailable. Cooling of the machine at low speed is the other check to make.

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