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