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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
22 days ago
I'm not sure, but I think it's 4 in. (101.6 mm) for smaller systems
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Merilyn
27 days ago
I believe it's 8 in. (203.2 mm) because it allows for better flow of water
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Tom
28 days ago
Gee, I hope the right answer isn't 'all of the above' - that would really hydrant my progress.
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Sylvia
8 days ago
B) 6 in. (152.4 mm)
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Sol
14 days ago
A) 4 in. (101.6 mm)
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German
1 months ago
10 inches? That's overkill. Who needs that much pipe for a measly hydrant?
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Izetta
1 months ago
Ha! They're trying to trick us. Everyone knows it's 4 inches for private fire service mains.
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Julieta
20 days ago
A) 4 in. (101.6 mm)
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Selene
1 months ago
I think it's 6 in. (152.4 mm)
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Santos
1 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
16 days ago
Definitely, we don't want to compromise on safety measures.
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Tish
24 days ago
Yes, it's important to have the right diameter for fire hydrants.
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Lenna
27 days ago
I think you're right, better to be safe with fire safety.
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Alex
1 months ago
I believe it's 8 inches to handle the flow rate.
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Stephania
2 months ago
Gotta be 6 inches, that's the standard for fire hydrants, right?
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Ronnie
10 days ago
That makes sense, thanks for confirming!
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Janessa
11 days 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
12 days ago
D) 10 in. (254 mm)
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Kris
13 days ago
C) 8 in. (203.2 mm)
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Elroy
19 days ago
B) 6 in. (152.4 mm)
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Hoa
21 days ago
A) 4 in. (101.6 mm)
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