Discuss NFPA CWBSP Exam Topic 2 Question 12

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)

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.

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37 comments · newest first

Emile 10 months ago

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

Nenita 10 months ago

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

Isadora 10 months ago

850 gpm seems excessive for that height, right?

Teresita 10 months ago

Minimum pressure is usually around 27 psi for ordinary hazards.

Helga 10 months ago

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

Carry 11 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.

Leatha 11 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.

Vanna 11 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.

Shawna 11 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.

Allene 12 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.

Izetta 12 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.

Caprice 12 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.

Paris 1 year 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.

Sharita 1 year 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.

Zana 1 year 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.

Wenona 1 year ago

↳ replying to Zana

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

Ressie 1 year ago

↳ replying to Zana

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

Tresa 1 year ago

↳ replying to Zana

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

Jeannetta 1 year 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?

Madalyn 1 year ago

↳ replying to Jeannetta

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

Ollie 1 year ago

↳ replying to Jeannetta

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

Barrett 1 year ago

↳ replying to Jeannetta

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

Zena 1 year ago

↳ replying to Jeannetta

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

Son 1 year ago

↳ replying to Jeannetta

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

Serina 1 year ago

↳ replying to Jeannetta

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

German 1 year 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.

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.

Evangelina 1 year ago

↳ replying to Graciela

D it is then. Better safe than sorry when it comes to sprinkler systems.

Vallie 1 year ago

↳ replying to Graciela

I'm leaning towards D as well. It's better to have more pressure than not enough in this case.

Aleta 1 year ago

↳ replying to Graciela

Agreed, D seems like the safest option to ensure proper coverage and flow.

Carlota 1 year ago

↳ replying to Graciela

I think D is the right choice too. The higher elevation and fully monitored system definitely need that extra pressure.

Deeanna 1 year ago

The NFPA 13 Ordinary Hazard Pipe Schedule method is the key here. I think the answer is C - 500 gpm at 32 psi.

Serita 1 year ago

↳ replying to Deeanna

Yes, I also believe the answer is C - 500 gpm at 32 psi based on the information provided.

Lavonda 1 year ago

↳ replying to Deeanna

I agree with you, the Ordinary Hazard Pipe Schedule method is crucial in determining the minimum pressure and flow requirements.

Leota 2 years ago

Hmm, I see your point. Maybe we should review the calculations again.

Leslie 2 years ago

I disagree, I believe the correct answer is D) 850 gpm at 32 psi.

Leota 2 years ago

I think the answer is A) 500 gpm at 27 psi.

NFPA CWBSP Exam - Topic 2 Question 12 Discussion