On Sep 4, 2007, at 4:49 AM, Richard Malek wrote:
If you are referring to basic NFPA 13, 15, 20, etc. requirements, a
reserve
pump isn't required although if you have an electric drive without a
reliable power source, maybe in that case you could say you need a
reserve
(i.e. diesel drive) although I wouldn't look at that way. One
supply (water
supply + pump in this case) is required and satisfy with diesel or
electric.
This isn't stated but understood. Maybe it's time for such a
statement. NFPA 20 is taking proposals.
I can't say with 100% surety but I think there is a 99.9% chance that
you will not get answers to such questions form NFPA. They can tell
you what a section of the standard tells you but not design choices.
I'm not sure if there is an occupancy type NFPA standard that
requires a
reserve pump (I would doubt it, but I'm not familiar with every NFPA
occupancy type standard)
NFPA 409 - Aircraft Hangars (which uses big deluge systems) is the
only standard that comes to mind where multiples fire pumps are
applied. The penalty for using more than one pump to meet your
single demand is that you have to assume that the highest capacity
pump will fail to operate. Thus, you will need three, not two pumps.
Granted they have very high value contents (can be in the billions)
that warrants an increase in the level of protection, but it is the
only standard that I can think of that addresses using multiple pumps.
Roland
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