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NFPA Exam CWBSP Topic 1 Question 8 Discussion

Actual exam question for NFPA's CWBSP exam

Question #: 8
Topic #: 1

[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?

A28 psi (1.9 bar)

B24 psi (1.65 bar)

C21 psi (1.45 bar)

D19 psi (1.31 bar)

Show Suggested Answer

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 Horace at Jan 15, 2025, 10:43 PM

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Francine

7 days ago

This is a trick question, right? The answer is definitely E) All of the above. Friction, the universal constant in fluid dynamics.

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Vinnie

8 days ago

A) 28 psi (1.9 bar). Gotta love those hydraulic pressure drops, keeps us on our toes!

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Ressie

1 months ago

But the C-factor is high, so it should be A) 28 psi.

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Yvonne

1 months ago

I disagree, I believe it's B) 24 psi.

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Ressie

1 months ago

I think the answer is A) 28 psi.

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Sharen

1 months ago

Hmm, let me see. Okay, I've got it - C) 21 psi (1.45 bar). Friction, you can't live with it, can't live without it.

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Anika

1 months ago

D) 19 psi (1.31 bar). It's all about that pipe roughness, baby! C-factor of 120, no doubt.

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Wei

1 months ago

I'm pretty sure it's B. 24 psi (1.65 bar). Friction is the bane of every hydraulic system, am I right?

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Geraldo

22 days ago

User3: I agree with User2, B) 24 psi (1.65 bar) sounds right

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Sharmaine

24 days ago

User2: I'm going with B) 24 psi (1.65 bar)

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Delpha

30 days ago

User1: I think it's A) 28 psi (1.9 bar)

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