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Best Proportioner Type for Hangar Foam System?

12/27/2024

7 Comments

 
We have a project for a Aircraft Hangar Group II. We will be designing the foam system based on Inline balance pressure proportioning design under NFPA 16 Annex material.

The protected area has been divided into 3 zones. We are using an 8" Alarm check valve with a closed-head sprinkler for each zone. So the fire line is fully pressurized with water.

What proportioner should I be using?

Is it an inline balance pressure proportioner or a wide range / variable range proportioner better to get the 3% concentration when foam discharge at the nozzle?

Thanks in advance.


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7 Comments

Foam Design Criteria for Diesel Storage Tank?

11/8/2023

8 Comments

 
We have a project design for a single room (26'-0" x 14'-6", height of 13'-2"). The room is noncombustible and is solely for the storage of one large metal diesel fuel storage tank in the basement of a hospital. The tank is under 8-ft tall.
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I have researched NFPA 13, 16, and NFPA 30. I used the tables for sprinkler type and criteria.

My confusion is the amount of storage and the size of the tank.

The tables in NFPA 30, starting with Chapter 16.5.2.1, have guidelines for tank sizes up to 60 gallons only. This is a much larger, metal, stationary tank (3,000 gallons).

What table or design criteria can be used?

K-factors of 8.0 or 11.2 - and 0.30 or 0.40 density?

We will be using foam for this project and I just want to be sure that I'm approaching and educating myself for the correct approach without missing or violating limitations within NFPA 30 (or the other standards). Thanks for the help!

​​​​​​​​​​​​​​​​​​​​​​​​​Sent in anonymously for discussion. Click Title to View | Submit Your Question | Subscribe
8 Comments

How to Determine the Reserve Amount of Foam?

8/25/2023

6 Comments

 
What is the correct procedure for determining the quantity of the reserve amount of foam, such as FP 3%, for a plant?

I've looked specifically through NFPA 11 and NFPA 16, and can't determine it.

Thanks in advance.

​​​​​​​​​​​​​​​​​​​​​​​​Sent in anonymously for discussion. Click Title to View | Submit Your Question | Subscribe
6 Comments

Use Grate Nozzles without Low-Expansion Foam?

12/9/2022

6 Comments

 
I am a fire sprinkler fitter a military installation. Have a question regarding low expansion foam systems with the use of Viking Grate nozzles.

Of course with the concerns of AFFF, there are many issues and decisions flying around about the existing systems we have out here in our aircraft hangars.

Is it acceptable to use the Viking grate nozzles without the low expansion foam?

How does this provide any fire protection?

Obviously, this is not how the system was designed, in my opinion.

Please help me understand how this can be acceptable. I appreciate any and all input. 

​​​​​​​​​​​​​​​​​​​​​​​​​​Sent in anonymously for discussion. Click Title to View | Submit Your Question | Subscribe
6 Comments

Balance Two Separate Foam Systems in Calc?

10/19/2022

8 Comments

 
We are designing a foam system (not a water spray) protecting an industrial facility.

Two systems are being designed, and they're located side-by-side. The two systems are not currently interconnected, but I believe they should be and balanced.

We're getting some pushback on our approach and I'm interested in other opinions here.

Do the system volumes need to be combined and compared to the available water supply, or can each system be calculated separately (but still flowing at the same time without balancing)?

Thanks in advance.

​​​​​​​​​​​​​​​​​​​​​​​​​Sent in anonymously for discussion. Click Title to View | Submit Your Question | Subscribe
8 Comments

Single Foam Proportioner for Multiple Valves?

8/17/2022

7 Comments

 
I'm working on a project with a foam-water sprinkler system using NFPA 16 Section A.5.4.2 as a guide.

There are four rooms with different dimensions that need to be protected and we have a deluge valve on each room. My client wants to have a single proportioner for the four rooms.

Can I achieve the 3% concentration in each room even though the orifice is size based on the largest room?

Or do I have to provide a proportioner for each room to be able to achieve the 3% upon discharge on any room?

Any guidance here is much appreciated.

​​​​​​​​​​​​​​​​​​​​​​​​​Sent in anonymously for discussion. Click Title to View | Submit Your Question | Subscribe
7 Comments
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Our goal is to improve fire protection practices worldwide. We promote the industry by creating helpful tools and resources, and by bringing together industry professionals to share their expertise.

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The views, opinions, and information found on this site represent solely the author and do not represent the opinions of any other party, nor does the presented material assume responsibility for its use. Fire protection and life safety systems constitute a critical component for public health and safety and you should consult with a licensed professional for proper design and code adherence.

Discussions are solely for the purpose of peer review and the exchange of ideas. All comments are reviewed. Comments which do not contribute, are not relevant, are spam, or are disrespectful in nature may be removed. Information presented and opinions expressed should not be relied upon as a replacement for consulting services. Some (not all) outbound links on this website, such as Amazon links, are affiliate-based where we receive a small commission for orders placed elsewhere.

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