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

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Ettie

1 days ago

I think the answer is A) 28 psi (1.9 bar)

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