In High rise building, do we have to install two pressure reducing valve in a row in case one of them breaks down ?
Thanks for the information !
The standards do not require backup PRV's when they are installed. NFPA 25 does require annual testing of the PRV's either by full flow testing or removal and bench testing of the unit. This is to ensure that they are operational at all times.
Depending on the type of installation that is requiring the PRV, it may be good practice to install a second unit. The units should be installed in parallel. Two PRV's in a row will have a doubling effect of the pressure reduction.
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