NFPA Exam CWBSP Topic 4 Question 15 Discussion

Actual exam question for NFPA's CWBSP exam

Question #: 15
Topic #: 4

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

Limited Time Offer

25%

Off

Get Premium CWBSP Questions as Interactive Web-Based Practice Test or PDF

Contribute your Thoughts:

Submit Cancel

Shawna

6 days ago

I agree with Corrina, C) 21 psi (1.45 bar) makes sense to me

upvoted 0 times

...

Corrina

8 days ago

I'm leaning towards C) 21 psi (1.45 bar) because of the C-factor

upvoted 0 times

...

Chauncey

10 days 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!'

upvoted 0 times