Question 345Steam Plants - Assistant Engineer
70% to passThe net positive suction head of a boiler centrifugal feed pump should be calculated over and above the _______________.
Aspeed of the impeller
Bimpeller ratio of the pump
Cfeed water vapor pressure
Dpump capacity in gpm
AI Explanation
The correct answer is C) feed water vapor pressure. The net positive suction head (NPSH) of a boiler centrifugal feed pump should be calculated over and above the feed water vapor pressure. This is because the NPSH represents the minimum pressure required at the pump inlet to prevent cavitation, which can occur when the pressure drops below the feed water vapor pressure. Calculating the NPSH in this manner ensures that the pump operates safely and efficiently, preventing damage and maintaining proper boiler operation. The other answer choices are incorrect because they do not directly relate to the critical factor of feed water vapor pressure in determining the required NPSH for the pump.
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