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A permanent orifice plate in a pipe represents an energy cost because it

  • A.has to be replaced at regular intervals
  • B.reduces the temperature of the fluid passing it
  • C.dissipates a pressure drop continuously
  • D.requires an electrical supply for its transmitter

Answer: C

The unrecovered pressure loss is pumping or fanning energy spent for measurement alone, and over a year on a large duct it is substantial. A venturi recovers much more of it, and an ultrasonic meter none at all, which is a point in its favour.

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