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Which type of boilers are called drum-less boilers?

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Which type of boilers are called drum-less boilers?

(a) Natural circulation boilers

(b) Fire tube boilers

(c) Positive forced circulation boiler

(d) Forced circulation boiler

This question was addressed to me in homework.

My question comes from Boiler Classification in section Steam Generators & Accessories of Energy Engineering

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The correct choice is (c) Positive forced circulation boiler

The explanation is: In positive forced boilers, water enters the bottom of the tubes and completely transforms into steam as it passes through the tubes and reaches at the top. Thus, these boilers do not need a steam drum and hence often referred as drum-less boilers. These boilers work at very high pressures.

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