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Insulating a bare steam main saves energy in proportion to

  • A.the pressure of the steam it carries
  • B.the length of the main alone
  • C.the velocity of the steam within it
  • D.the surface area and the temperature difference

Answer: D

The loss from a hot surface is the area multiplied by a heat transfer coefficient and by the rise above ambient, so a long large-diameter main at high temperature loses most. Valves and flanges left bare are a large share of many sites' losses.

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