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NFPA Exam CWBSP Topic 4 Question 15 Discussion

Actual exam question for NFPA's CWBSP exam
Question #: 15
Topic #: 4
[All CWBSP Questions]

How much pressure is lost to friction as 1,200 gpm (4542 L/min) travels through 200 ft (61 m) of 5 in. (130 mm) schedule 40 steel pipe with a C-factor of 120?

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Suggested Answer: C

The pressure loss due to friction for 1,200 gpm traveling through 200 ft of 5 in. schedule 40 steel pipe with a C-factor of 120 is approximately 21 psi (1.45 bar). This calculation takes into account the flow rate, pipe length, diameter, and roughness factor.


by Piraisudan P at May 26, 2025, 09:48 AM

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Amber
16 days ago
Ah, the age-old dilemma of pipe friction. I say we just go with option D) 19 psi (1.31 bar) and call it a day. Unless, of course, the question is secretly a riddle about the meaning of life. In that case, I'm going with 42 psi (2.9 bar).
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Cordell
9 days ago
I agree, let's go with that.
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Jose
10 days ago
I think option D) 19 psi (1.31 bar) sounds good to me.
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Verda
22 days ago
This is easy, it's gotta be 19 psi (1.31 bar). Unless the question is trying to trick us by making the pipe size and flow rate too perfect. In that case, I'm going with 24 psi (1.65 bar) just to be safe.
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Tenesha
24 days ago
Let's see, 1,200 gpm through 200 ft of 5 in. pipe... Yep, definitely 21 psi (1.45 bar). I'm an engineer, I know these things.
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Larue
10 days ago
No way, it's definitely 19 psi (1.31 bar).
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Erick
13 days ago
I think it's actually 24 psi (1.65 bar).
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Shawna
1 months ago
I agree with Corrina, C) 21 psi (1.45 bar) makes sense to me
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Corrina
1 months ago
I'm leaning towards C) 21 psi (1.45 bar) because of the C-factor
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Chauncey
1 months ago
Nah, I'm going with 28 psi (1.9 bar). Can't be too far off with those massive pipes, right? My grandpa used to say, 'When in doubt, go big or go home!'
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Tiffiny
3 days ago
I agree with you, 28 psi (1.9 bar) seems like a safe bet with those big pipes.
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Marcos
20 days ago
I'm going with 21 psi (1.45 bar), better to be on the safe side.
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Lelia
1 months ago
I think it's 24 psi (1.65 bar), the friction loss shouldn't be too high.
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Stephanie
1 months ago
I disagree, I believe it's B) 24 psi (1.65 bar)
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Teri
2 months ago
Hmm, this looks like a trick question. The pipe size and flow rate are just too specific, it's gotta be 24 psi (1.65 bar).
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Marilynn
1 months ago
User2: Yeah, I agree. The specifics seem to point to that answer.
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Annamae
1 months ago
User1: I think it's 24 psi (1.65 bar).
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Ettie
2 months ago
I think the answer is A) 28 psi (1.9 bar)
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