Centrifugal pump affinity laws

CENTRIFUGAL PUMP AFFINITY LAWS 19-04

  • The capacity or amount of fluid you are pumping will vary directly with this number.
  • The head produced by the pump varies by the square of the number.
  • The horsepower required changes by the cube of the number
  • The net positive suction head required by the pump manufacturer (NPSHR) varies approximately by the square of the number.
  • The amount of shaft run out (deflection) varies approximately by the square of the number
  • The amount of friction loss in the piping varies approximately by 90% of the square of the number. Fittings and accessories vary approximately by the square of the number.
  • The wear rate of the components varies approximately by the cube of the number.

Posted

  • On February 13, 2018