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NFPA Exam CWBSP Topic 4 Question 2 Discussion

Actual exam question for NFPA's CWBSP exam
Question #: 2
Topic #: 4
[All CWBSP Questions]

Using the Hazen-Williams formula, determine the friction loss in 150 ft (45.7 m) of 1 in. (25 mm) black steel schedule

40 pipe, flowing 30 gpm (115 lpm) in a wet system.

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Suggested Answer: A

Using the Hazen-Williams formula, the friction loss in 150 feet of 1-inch black steel schedule 40 pipe flowing 30 gpm in a wet system would be approximately 27.5 psi. This calculation considers the pipe's material, size, length, and flow rate.


by Margurite at Nov 15, 2024, 01:15 PM

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Luis
3 days ago
This question is a pipe dream, but I think the answer is C. Pipe down, everyone else!
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Terrilyn
16 days ago
Definitely D, 57.9 psi (3.99 bar). No way it's only 27.5 psi (1.89 bar) with that small of a pipe.
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Reita
18 days ago
Hmm, C looks like the right answer to me. 52.2 psi (3.6 bar) seems about right for that pipe and flow rate.
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Anglea
2 days ago
I agree with you, C seems to be the most fitting answer. 52.2 psi (3.6 bar) makes sense for this situation.
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Jill
5 days ago
I'm leaning towards B. 41.3 psi (2.93 bar) seems like it could be the right friction loss for that setup.
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Truman
7 days ago
I think A is the correct answer. 27.5 psi (1.89 bar) sounds more accurate for this scenario.
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Nina
18 days ago
I'm not sure, but I think the answer might be D) 57.9 psi (3.99 bar)
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Effie
23 days ago
I think the answer is B, 41.3 psi (2.93 bar). The Hazen-Williams formula is the way to go for this one.
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Regenia
24 days ago
I disagree, I believe the correct answer is C) 52.2 psi (3.6 bar)
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Bette
26 days ago
I think the answer is A) 27.5 psi (1.89 bar)
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