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NFPA CWBSP Exam - Topic 4 Question 15 Discussion

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?
C) 21 psi (1.45 bar)
A) 28 psi (1.9 bar)
B) 24 psi (1.65 bar)
D) 19 psi (1.31 bar)

NFPA CWBSP Exam - 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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Art
7 months ago
Totally agree with 24 psi, seems reasonable!
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Merilyn
7 months ago
Wait, 28 psi? That seems high for just friction loss!
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Maddie
7 months ago
I think it's more like 24 psi, though.
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Lai
7 months ago
21 psi sounds about right to me.
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Judy
7 months ago
It's definitely around 28 psi for that setup.
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Vicky
8 months ago
I’m leaning towards option A, but I remember there were different factors to consider, and I hope I didn’t overlook anything important.
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Andra
8 months ago
I feel like the answer might be around 24 psi, but I could be mixing it up with another example we practiced.
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Talia
8 months ago
I think the C-factor plays a big role here, but I'm not entirely sure how to apply it to find the pressure loss.
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Andra
8 months ago
I remember we did a similar problem in class, but I can't recall the exact formula for calculating pressure loss.
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Arlette
9 months ago
No problem, I've got this. I've done plenty of these types of problems before. Just need to plug and chug the numbers into the right formula.
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Wenona
9 months ago
Wait, what's a C-factor again? I remember learning about that in class, but I'm drawing a blank on the details. I better review my notes before trying to solve this.
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Christa
9 months ago
Okay, I think I've got this. I'll use the given flow rate, pipe diameter, pipe length, and C-factor to solve for the pressure loss. Should be a pretty simple calculation.
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Stefanie
9 months ago
Hmm, I'm a bit unsure about the units here. Do I need to convert anything before plugging it into the equation?
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Sharika
9 months ago
This looks like a straightforward pipe friction problem. I'll need to use the Darcy-Weisbach equation to calculate the pressure loss.
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Amber
1 year 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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Margarita
11 months ago
Yeah, let's just stick with option D).
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Cordell
1 year ago
I agree, let's go with that.
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Jose
1 year ago
I think option D) 19 psi (1.31 bar) sounds good to me.
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Verda
1 year 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
1 year 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
1 year ago
No way, it's definitely 19 psi (1.31 bar).
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Erick
1 year ago
I think it's actually 24 psi (1.65 bar).
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Shawna
1 year ago
I agree with Corrina, C) 21 psi (1.45 bar) makes sense to me
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Corrina
1 year ago
I'm leaning towards C) 21 psi (1.45 bar) because of the C-factor
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Chauncey
1 year 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
12 months ago
I agree with you, 28 psi (1.9 bar) seems like a safe bet with those big pipes.
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Marcos
1 year ago
I'm going with 21 psi (1.45 bar), better to be on the safe side.
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Lelia
1 year ago
I think it's 24 psi (1.65 bar), the friction loss shouldn't be too high.
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Stephanie
1 year ago
I disagree, I believe it's B) 24 psi (1.65 bar)
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Teri
1 year 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 year ago
User2: Yeah, I agree. The specifics seem to point to that answer.
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Annamae
1 year ago
User1: I think it's 24 psi (1.65 bar).
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Ettie
1 year ago
I think the answer is A) 28 psi (1.9 bar)
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