Q.

What is the steam pressure limit of natural circulation boilers?

A. 650bar
B. 180bar
C. 400bar
D. 550bar
Answer» B. 180bar
Explanation: water is purely circulated by density difference with most of the heat from the fuel flame being radiated to the water walls directly. the steam pressure of such boilers is limited to about 180bar, with water and steam being separated in the boiler drum.
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