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What is the main disadvantage of Lamont boiler?

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What is the main disadvantage of Lamont boiler?

(a) Less flexible in design

(b) Low heat transfer rate

(c) Formation of bubbles

(d) Low steam generation capacity

I have been asked this question in an internship interview.

This key question is from Types of High Pressure Boilers topic in section Steam Generators & Accessories of Energy Engineering

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Correct answer is (c) Formation of bubbles

To elaborate: The main disadvantage of Lamont boiler is the formation of bubbles. These bubbles come in contact with the inner surface of the heating tubes and subsequently are attached to it. The bubbles attached to the tube surface have higher thermal resistance and consequently reduce the heat flow and steam generation.

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