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Boiler blowdown is necessary to

  • A.control the pressure at which the boiler operates
  • B.raise the temperature of the feedwater
  • C.limit the dissolved solids in the boiler water
  • D.remove the air dissolved in the feedwater

Answer: C

Solids enter with the feedwater and concentrate as steam is raised, and beyond a limit they cause carryover and scale. Discarding a fraction of the hot water keeps the concentration within bounds and takes its heat with it.

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