If this location has an HPR carrier (i.e. FM Global, etc.), you had
better check with them. They may dictate what you can and cannot do.
Ran into this with an FM job with an oversized pump.
At 12:07 PM 7/9/2008, you wrote:
I have to install a pressure reducing valve on the discharge side of
the fire pump. I know from past discussions that if standpipes are
present, the valve must be installed after the last control valve for
the fire pump to satisfy NFPA 14. What if this is a large warehouse
falling strictly under 13? Could it be placed between the pump
discharge and check valve (just like pressure relief valve on a diesel
FP) and sized per minimum relief valve in 2-20 (NFPA 20 99ed)? I have a
2000gpm pump with a 8" discharge flange and would like to get a 8"
pressure reducing valve to work instead of a 10in (size required for
discharge pipe) to save some money. I checked the spec sheets and the
8" valve can handle the flow at 150%.
Thanks,
Dewayne
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Todd G. Williams, PE
Fire Protection Design/Consulting
Stonington, Connecticut
www.fpdc.com
860.535.2080
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