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Discussion

Reducing steam pressure to the lowest the process will accept saves energy because

  • A.less feedwater treatment is then required
  • B.the distribution losses and the flash losses both fall
  • C.the latent heat per kilogram falls with pressure
  • D.the boiler efficiency rises with lower pressure

Answer: B

Lower saturation temperature means smaller losses from every metre of main and every trap, and less flashing at each let-down. The latent heat per kilogram actually rises as pressure falls, which is a further small benefit.

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