I have a plan reviewer that is not accepting our proposed design for a manual standpipe calculation.
The calculation shows a required pressure on the fire department pumper truck to be a minimum of 217 PSI.
It has been confirmed that the pumper truck can reach and/or exceed 250 PSI.
The AHJ is requesting that we increase the standpipe from 4-inch to 6-inch, which is not alleviating the higher pressures as we are still above 175 PSI.
This would be a first for me to have to install pressure reducing hose valves on a manual wet standpipe.
My understanding per NFPA-14 (2016) 220.127.116.11 is that this is only an issue when the static pressures on the systems exceed 175 PSI (city static is 113 PSI).
So in essence, we are advising the fire department pumper truck operator to dial his pump up to 217, but this wouldn't be static, as they would be flowing out of the hose valve(s), correct?
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PE PREP SERIES