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NFPA Exam CFI-I Topic 2 Question 4 Discussion

Actual exam question for NFPA's CFI-I exam
Question #: 4
Topic #: 2
[All CFI-I Questions]

What is the minimum diameter allowed for piping serving fire hydrants on private fire service mains?

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Suggested Answer: B

Comprehensive and Detailed Step-by-Step Explanation:

Fire Hydrant Piping Diameter:

Per NFPA 24 (Standard for the Installation of Private Fire Service Mains and Their Appurtenances), Section 5.2.1, the minimum diameter for piping serving fire hydrants on private fire service mains is 6 inches (152.4 mm).

Why 6 Inches is Required:

A minimum 6-inch pipe ensures sufficient water flow and pressure to meet firefighting demands.

Other Options Explained:

Option A (4 in): Too small; insufficient for hydrant water supply.

Option C (8 in) and Option D (10 in): Acceptable but exceed the minimum requirement.

Summary:

The minimum diameter for piping serving fire hydrants on private fire service mains is 6 inches (152.4 mm).


by Pete at Jan 16, 2025, 12:08 AM

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Barbra
2 months ago
I'm not sure, but I think it's 4 in. (101.6 mm) for smaller systems
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Merilyn
2 months ago
I believe it's 8 in. (203.2 mm) because it allows for better flow of water
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Tom
2 months ago
Gee, I hope the right answer isn't 'all of the above' - that would really hydrant my progress.
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Sylvia
2 months ago
B) 6 in. (152.4 mm)
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Sol
2 months ago
A) 4 in. (101.6 mm)
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German
2 months ago
10 inches? That's overkill. Who needs that much pipe for a measly hydrant?
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Izetta
3 months ago
Ha! They're trying to trick us. Everyone knows it's 4 inches for private fire service mains.
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Elenora
1 months ago
B) 6 in. (152.4 mm)
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Jessenia
1 months ago
That's correct, it is indeed 4 inches for private fire service mains.
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Julieta
2 months ago
A) 4 in. (101.6 mm)
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Selene
3 months ago
I think it's 6 in. (152.4 mm)
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Santos
3 months ago
Hmm, I think it's 8 inches to handle the flow rate. Better to err on the side of caution with fire safety.
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Dianne
2 months ago
Definitely, we don't want to compromise on safety measures.
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Tish
2 months ago
Yes, it's important to have the right diameter for fire hydrants.
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Lenna
2 months ago
I think you're right, better to be safe with fire safety.
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Alex
3 months ago
I believe it's 8 inches to handle the flow rate.
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Stephania
3 months ago
Gotta be 6 inches, that's the standard for fire hydrants, right?
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Ronnie
2 months ago
That makes sense, thanks for confirming!
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Janessa
2 months ago
Yes, you're correct. The minimum diameter allowed for piping serving fire hydrants on private fire service mains is 6 inches.
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Diego
2 months ago
D) 10 in. (254 mm)
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Kris
2 months ago
C) 8 in. (203.2 mm)
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Elroy
2 months ago
B) 6 in. (152.4 mm)
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Hoa
2 months ago
A) 4 in. (101.6 mm)
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