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NFPA CFPS Exam - Topic 5 Question 7 Discussion

For sprinkler design densities of 0.34 gpm/ft* (13.9 mm/min) or less, what minimal standard-response sprinkler nominal orifice coefficient should be used?
B) K 5.6 Km-80)
A) K4.2 (Km=60)
C) K 8.0 (Km=115)
D) K11.2(Km=160)

NFPA CFPS Exam - Topic 5 Question 7 Discussion

Actual exam question for NFPA's CFPS exam
Question #: 7
Topic #: 5
[All CFPS Questions]

For sprinkler design densities of 0.34 gpm/ft* (13.9 mm/min) or less, what minimal standard-response sprinkler nominal orifice coefficient should be used?

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Suggested Answer: B

by Adolph at Mar 08, 2025, 11:33 PM

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Derick
7 months ago
Standard is K4.2 (Km=60) for 0.34 gpm/ft².
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Estrella
8 months ago
Wait, are we really using K4.2 for such low densities?
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Leana
8 months ago
K8.0 seems too high for that density.
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Christoper
8 months ago
I think it should be K5.6, not K4.2.
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Fidelia
8 months ago
It's K4.2 for sure!
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Agustin
9 months ago
I’m leaning towards K4.2 too, but I remember there being some confusion about the ranges for different densities.
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Jaime
9 months ago
I feel like K8.0 could be the right choice, but I need to double-check my notes on sprinkler coefficients.
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Carmen
9 months ago
I practiced a similar question where K5.6 was mentioned, but I can't recall if that was for a higher density.
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Theola
9 months ago
I think the answer might be K4.2, but I'm not entirely sure. I remember something about lower densities needing lower coefficients.
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Lelia
9 months ago
Hmm, I'm not totally sure about this one. I'll need to review my notes and the course materials to make sure I understand the relationship between sprinkler design density and orifice coefficient.
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Gracia
9 months ago
I've got this! For sprinkler design densities of 0.34 gpm/ft² or less, the minimal standard-response sprinkler nominal orifice coefficient is K5.6 (Km=80).
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Angelo
9 months ago
Wait, what's the difference between the K-factors and Km values? I'm a bit confused on how to interpret those.
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Kizzy
9 months ago
Okay, I remember learning about this in class. I think the key is to find the minimal standard-response sprinkler nominal orifice coefficient for the given sprinkler design density.
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Margurite
9 months ago
Hmm, this seems like a tricky one. I'll need to think through the sprinkler design density and orifice coefficient requirements carefully.
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Gregg
1 year ago
I remember studying this, and I think the answer is actually B) K 5.6 Km-80)
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Marvel
1 year ago
Ah, the age-old debate: 'K-factor, Km-factor, or just go with the flow?' *chuckles* I'm sticking with B. K 5.6 (Km=80) - it's the Goldilocks of sprinkler coefficients.
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Gearldine
1 year ago
Woah, this question is making my head spin. I'm just gonna go with A. K4.2 (Km=60) and hope for the best. What's the worst that could happen, right? *nervous laughter*
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Rolland
1 year ago
I'm not sure, but I think it might be D) K11.2(Km=160)
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Jacinta
1 year ago
Hold up, is this a trick question? I'm going with D. K11.2 (Km=160) just to be safe. Gotta cover all my bases, you know?
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Johana
1 year ago
Let's go with D then, better safe than sorry.
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Theodora
1 year ago
I'm not sure, but I would go with D as well.
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Ludivina
1 year ago
I think D is a safe choice too.
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Lavelle
1 year ago
Nah, I'm going with C. K 8.0 (Km=115) - bigger is better, right? Plus, it sounds more badass.
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Glory
1 year ago
User3: I'm not so sure, I think D might be a better option. K11.2 (Km=160) sounds more powerful.
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Trinidad
1 year ago
User2: Yeah, I agree. Bigger is better when it comes to sprinkler design densities.
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Melodie
1 year ago
User1: I think C is the way to go. K 8.0 (Km=115) seems solid.
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Coral
1 year ago
I think the answer is B. K 5.6 (Km=80) because that's the standard for low-density sprinkler systems.
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Leatha
1 year ago
Yes, following the standards ensures the sprinkler system will function properly in case of a fire.
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Quentin
1 year ago
I think we should always refer to the guidelines for sprinkler design densities.
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Jacquline
1 year ago
That makes sense, it's important to use the correct standard-response sprinkler nominal orifice coefficient.
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Reita
1 year ago
I agree, the answer is B. K 5.6 (Km=80) for low-density sprinkler systems.
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Eliz
1 year ago
I disagree, I believe the correct answer is C) K 8.0 (Km=115)
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Kimbery
1 year ago
I think the answer is A) K4.2 (Km=60)
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