Foam concentrate storage quantity
Foam concentrate storage quantity
(OP)
Greetings everyone,
I am designing a pretty straightforward manual low expansion foam system for fuel storage tanks. According to calculations I need approximately 12,000 gal. of foam concentrate to comply with NFPA 11 requirements. The client is suggesting that the foam concentrate line runs as close to the hazard as possible (190 ft in this case) and that the line is kept filled with concentrate at all times and the volume inside them be considered as part of the required volume so the storage tank is reduced. Is this even possible? I haven't seen anything in the code against it but it is something I had never been asked to do before. Any help with this will be greatly appreciated.
I am designing a pretty straightforward manual low expansion foam system for fuel storage tanks. According to calculations I need approximately 12,000 gal. of foam concentrate to comply with NFPA 11 requirements. The client is suggesting that the foam concentrate line runs as close to the hazard as possible (190 ft in this case) and that the line is kept filled with concentrate at all times and the volume inside them be considered as part of the required volume so the storage tank is reduced. Is this even possible? I haven't seen anything in the code against it but it is something I had never been asked to do before. Any help with this will be greatly appreciated.





RE: Foam concentrate storage quantity
RE: Foam concentrate storage quantity
RE: Foam concentrate storage quantity
From NFPA11 you should be sure the pipe material does not affect the quality of the concentrate. So from this, I suppose it is difficult to guarantee that a long pipe is safe for the concentrate, I cannot find an explicit rule neither.
You should include an extra volume to test and star up the system. When you test or start the system up you should leave some time(30-60secs) to make the concentration go steady.