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.

A27.5 psi (1.89 bar)

B41.3 psi (2.93 bar)

C52.2 psi (3.6 bar)

D57.9 psi (3.99 bar)

Show Suggested Answer

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

4 months ago

This question is a pipe dream, but I think the answer is C. Pipe down, everyone else!

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Kristofer

3 months ago

I agree with you, C seems to be the correct answer.

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Man

3 months ago

I'm going with C.

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Reita

4 months ago

I believe it's B.

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Timothy

4 months ago

I think the answer is A.

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Terrilyn

4 months 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

4 months 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

4 months 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

4 months 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

4 months 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

4 months ago

I'm not sure, but I think the answer might be D) 57.9 psi (3.99 bar)

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Effie

5 months 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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Lore

3 months ago

Let's review the formula together to make sure we are on the right track.

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Thaddeus

3 months ago

I calculated it again, and I still believe the answer is B, 41.3 psi (2.93 bar).

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Ashlee

3 months ago

I think the answer might be C, 52.2 psi (3.6 bar). Let's double-check the calculations.

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Marva

4 months ago

I agree, the Hazen-Williams formula is the best approach for this calculation.

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Regenia

5 months ago

I disagree, I believe the correct answer is C) 52.2 psi (3.6 bar)

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Bette

5 months ago

I think the answer is A) 27.5 psi (1.89 bar)

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