NFPA CWBSP Exam - Topic 2 Question 12 Discussion

Actual exam question for NFPA's CWBSP exam

Question #: 12
Topic #: 2

After reviewing an existing sprinkler system, it was determined that sprinklers were installed using NFPA 13 using the Ordinary Hazard Pipe Schedule method. The highest elevation of sprinklers is 28 ft (8.53m) and the system is fully monitored as specified by NFPA 13. What is the minimum pressure and flow required?

A500 gpm at 27 psi (1,900 L/min at 1.86 bar)

B850 gpm at 27 psi (3,200 L/min at 1.86 bar)

C500 gpm at 32 psi (1,900 L/min at 2.2 bar)

D850 gpm at 32 psi (3,200 L/min at 2.2 bar)

Show Suggested Answer

Suggested Answer: B

For a warehouse with the described characteristics, a design density of 0.33 gpm/ft is a common requirement to ensure adequate protection for Class III commodities on wooden pallets, taking into account the storage configuration and commodity type.

by Chaya at Mar 19, 2025, 03:11 PM

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Emile

4 months ago

I disagree, I think it should be option D for better coverage.

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Nenita

4 months ago

Wait, 32 psi? That seems high for ordinary hazards!

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Isadora

4 months ago

850 gpm seems excessive for that height, right?

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Teresita

5 months ago

Minimum pressure is usually around 27 psi for ordinary hazards.

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Helga

5 months ago

I think option A is correct, fits the NFPA guidelines.

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Carry

5 months ago

I recall that fully monitored systems might require a bit more pressure, so I’m considering option D, but I need to double-check the flow rates.

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Leatha

5 months ago

I’m leaning towards option C because it has 500 gpm, but I’m confused about whether the pressure should be 27 psi or 32 psi for this setup.

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Vanna

6 months ago

I think the pressure might be higher than 27 psi since the highest elevation is 28 ft. I practiced a similar question where elevation affected the pressure needed.

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Shawna

6 months ago

I remember that for Ordinary Hazard, we typically look for a minimum flow of 500 gpm, but I'm not sure about the pressure requirements.

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Allene

6 months ago

I'm a little confused by the wording of this question. I'll need to review the NFPA 13 standard to make sure I understand all the details before attempting to answer.

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Izetta

6 months ago

This question looks familiar from the practice problems we did. I'm confident I can apply the NFPA 13 requirements to find the correct minimum pressure and flow.

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Caprice

6 months ago

Okay, I think I've got this. The key is determining the appropriate pressure and flow based on the ordinary hazard classification and the system details provided. I'll work through the calculations step-by-step.

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Paris

7 months ago

Hmm, I'm a bit unsure about this one. The information about the sprinkler system height and monitoring is throwing me off. Let me re-read the question carefully.

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Sharita

7 months ago

This seems like a straightforward NFPA 13 question. I'll need to review the pipe schedule method and the requirements for ordinary hazard occupancies.

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Zana

12 months ago

I wonder if the sprinklers are installed in a way that they can actually reach the highest elevation. Might need to bring a ladder to check that out.

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Wenona

10 months ago

B) 850 gpm at 27 psi (3,200 L/min at 1.86 bar)

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Ressie

10 months ago

I think option A is correct, the pressure and flow seem appropriate for the sprinkler system.

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Tresa

11 months ago

A) 500 gpm at 27 psi (1,900 L/min at 1.86 bar)

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Jeannetta

12 months ago

Well, this is a real head-scratcher. I'll just close my eyes and point - D, 850 gpm at 32 psi. What could go wrong?

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Madalyn

10 months ago

User 3: I agree, D sounds like the correct option based on the information provided.

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Ollie

11 months ago

Zena: Well, I'm not entirely sure, but that's my best guess.

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Barrett

11 months ago

User 2: That seems like a reasonable choice. The system must be designed to meet those requirements.

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Zena

11 months ago

User 2: Are you sure about that? It seems like a high flow rate.

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Son

11 months ago

User 1: I think the answer is D, 850 gpm at 32 psi.

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Serina

11 months ago

User 1: I think the answer is D, 850 gpm at 32 psi.

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German

12 months ago

Ah, the old NFPA 13 Ordinary Hazard Pipe Schedule conundrum. I'm feeling lucky, let's go with B - 850 gpm at 27 psi.

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Graciela

1 year ago

Hmm, 28 ft elevation and fully monitored system, that sounds like it needs a bit more pressure than the lower pressure options. I'll go with D - 850 gpm at 32 psi.

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