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NFPA 11 Why The Pipe / valve requirements of...

NFPA 11 Why The Pipe / valve requirements of...

NFPA 11 Why The Pipe / valve requirements of...

(OP)
With regards to tank farms, I don't have access to older copies of NFPA 11 but apparently the following is fairly new and I was wondering if anyone knows the reasoning behind the requirements of 5.2.5.1.2.1 that refer to foam chamber piping and valving... each chamber is to be individually piped and valved with the valves extended out beyond the dike areas (and further to this 8.5.1). I have surmised that one reason may be if an individual chamber is damaged in the initial stages of a situation that if it has become a detriment it could be shut off individually allowing for the foam that might have been wasted to be redirected to useful outlets? As opposed to a pipe arrangement as I have seen where you have a ring main at the top of the tank feeding the chambers with one or two risers feeding this main, it seems like a dramatic excess of pipe and appears to create more problems than it might solve: it requires a larger volume of solution, the hydraulics are more of a challenge for distribution, pipe runs within the berm area create headaches for access, and not least of all, the cost is substantially more.

Any thoughts?

Regards
Dave

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