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NFPA CFI-I Exam - 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?

Show Suggested Answer Hide Answer
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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Lashaunda
3 months ago
Really? I had no idea it was that small!
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Nohemi
3 months ago
Nope, definitely 6 inches.
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Hyun
3 months ago
Wait, I thought it was 8 inches?
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Oretha
4 months ago
Totally agree, 6 in. is the standard.
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Gerald
4 months ago
It's 6 inches for private fire mains!
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Kattie
4 months ago
I’m confused about this one. I thought it was 6 inches, but I also remember seeing 10 inches in some guidelines.
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Erick
4 months ago
I’m leaning towards 8 inches. I recall that larger diameters are often recommended for better pressure and flow.
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Cordie
4 months ago
I practiced a question like this, and I feel like 4 inches was mentioned as a minimum for some systems, but maybe not for hydrants specifically.
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Susana
5 months ago
I think the minimum diameter is 6 inches, but I’m not completely sure. I remember something about it being related to flow rates.
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Han
5 months ago
This is a good test of our understanding of fire protection systems. I'm confident I know the correct answer, but I'll double-check the options just to be sure.
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Elly
5 months ago
I'm a bit confused by this question. I don't have a strong grasp of the code requirements for fire hydrant piping. I'll need to carefully review the options and try to eliminate the ones that don't seem plausible.
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Sage
5 months ago
Ah, I remember learning about this in the fire protection module. I believe the minimum diameter is 6 inches, so I'll go with option B.
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Arlean
5 months ago
Hmm, I'm not entirely sure about the specifics of fire hydrant piping regulations. I'll need to think this through and try to recall any relevant information from the course material.
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Catina
5 months ago
This seems like a straightforward question about fire hydrant piping requirements. I'll review the options carefully and choose the one that best matches the minimum diameter allowed.
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Barbra
1 year ago
I'm not sure, but I think it's 4 in. (101.6 mm) for smaller systems
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Merilyn
1 year ago
I believe it's 8 in. (203.2 mm) because it allows for better flow of water
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Tom
1 year ago
Gee, I hope the right answer isn't 'all of the above' - that would really hydrant my progress.
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Sylvia
1 year ago
B) 6 in. (152.4 mm)
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Sol
1 year ago
A) 4 in. (101.6 mm)
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German
1 year ago
10 inches? That's overkill. Who needs that much pipe for a measly hydrant?
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Izetta
1 year 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 year ago
B) 6 in. (152.4 mm)
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Jessenia
1 year ago
That's correct, it is indeed 4 inches for private fire service mains.
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Julieta
1 year ago
A) 4 in. (101.6 mm)
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Selene
1 year ago
I think it's 6 in. (152.4 mm)
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Santos
1 year 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
1 year ago
Definitely, we don't want to compromise on safety measures.
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Tish
1 year ago
Yes, it's important to have the right diameter for fire hydrants.
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Lenna
1 year ago
I think you're right, better to be safe with fire safety.
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Alex
1 year ago
I believe it's 8 inches to handle the flow rate.
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Stephania
1 year ago
Gotta be 6 inches, that's the standard for fire hydrants, right?
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Ronnie
1 year ago
That makes sense, thanks for confirming!
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Janessa
1 year 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
1 year ago
D) 10 in. (254 mm)
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Kris
1 year ago
C) 8 in. (203.2 mm)
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Elroy
1 year ago
B) 6 in. (152.4 mm)
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Hoa
1 year ago
A) 4 in. (101.6 mm)
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