A boiler is rated at 30,000 lb/hr and has a 5% blowdown loss. The minimum size feedwater pump to supply this boiler is _______ gal./hr.

A) 1,500 gal./hr
B) 2,000 gal./hr
C) 3,000 gal./hr
D) 4,000 gal./hr

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azikennamdi azikennamdi · Answer 1 · 2024-01-01T06:19:15-05:00

To calculate the minimum size of the feedwater pump required for a boiler with a blowdown loss, you can use the following formula:

Minimum Feedwater Pump Flow (gal/hr) = Boiler Rating (lb/hr) / (1 - Blowdown Loss Fraction)

In this case, the boiler rating is 30,000 lb/hr, and the blowdown loss is 5%, which is equivalent to 0.05 as a fraction.

Minimum Feedwater Pump Flow (gal/hr) = 30,000 lb/hr / (1 - 0.05)

Minimum Feedwater Pump Flow (gal/hr) = 30,000 lb/hr / 0.95

Minimum Feedwater Pump Flow (gal/hr) ≈ 31,578 gal/hr

So, the minimum size feedwater pump to supply this boiler is approximately 31,578 gal/hr.

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