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NFPA CWBSP Exam - Topic 4 Question 2 Discussion

Using the Hazen-Williams formula, determine the friction loss in 150 ft (45.7 m) of 1 in. (25 mm) black steel schedule40 pipe, flowing 30 gpm (115 lpm) in a wet system.
A) 27.5 psi (1.89 bar)
B) 41.3 psi (2.93 bar)
C) 52.2 psi (3.6 bar)
D) 57.9 psi (3.99 bar)

NFPA CWBSP Exam - 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.

Show Suggested Answer Hide 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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Malcom
7 months ago
Totally with you, Laurel! B feels spot on!
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Corazon
8 months ago
Wait, 57.9 psi? That seems way too high for that setup!
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Cory
8 months ago
I calculated it too, and I got C. Not sure about B.
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Laurel
8 months ago
I think it's definitely B, seems right to me.
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Sherman
8 months ago
The Hazen-Williams formula is key for this!
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Catrice
9 months ago
I remember the formula involves the diameter and length, but I’m a bit confused about how to apply it to get the right psi.
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Queenie
9 months ago
I feel like the flow rate really affects the friction loss, but I can't recall how to apply it correctly here.
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Alease
9 months ago
I think I did a similar question where we calculated friction loss in a longer pipe. I might lean towards option B, but I need to double-check my calculations.
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Stephaine
9 months ago
I remember practicing the Hazen-Williams formula, but I'm not sure about the exact coefficients for steel pipe.
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Una
9 months ago
I've got this! The Hazen-Williams formula is second nature to me at this point. I'll work through it step-by-step and nail the right answer.
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Tayna
9 months ago
This looks straightforward enough. I just need to be careful with the unit conversions and make sure I'm using the right values in the formula.
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Alesia
9 months ago
Okay, let's see. I need to plug in the pipe length, diameter, and flow rate into the Hazen-Williams equation. Then I can calculate the friction loss and compare it to the answer choices.
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Lon
9 months ago
Hmm, I'm a bit unsure about how to apply the Hazen-Williams formula correctly here. I'll need to review the formula and make sure I have the right variables.
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Myra
9 months ago
I think I can handle this one. The Hazen-Williams formula should give me the friction loss in the pipe based on the flow rate and pipe dimensions.
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Luis
2 years ago
This question is a pipe dream, but I think the answer is C. Pipe down, everyone else!
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Kristofer
2 years ago
I agree with you, C seems to be the correct answer.
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Man
2 years ago
I'm going with C.
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Reita
2 years ago
I believe it's B.
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Timothy
2 years ago
I think the answer is A.
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Terrilyn
2 years 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
2 years 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 years 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
2 years 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
2 years 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
2 years ago
I'm not sure, but I think the answer might be D) 57.9 psi (3.99 bar)
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Effie
2 years 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
2 years ago
Let's review the formula together to make sure we are on the right track.
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Thaddeus
2 years ago
I calculated it again, and I still believe the answer is B, 41.3 psi (2.93 bar).
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Ashlee
2 years 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
2 years ago
I agree, the Hazen-Williams formula is the best approach for this calculation.
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Regenia
2 years ago
I disagree, I believe the correct answer is C) 52.2 psi (3.6 bar)
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Bette
2 years ago
I think the answer is A) 27.5 psi (1.89 bar)
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