I'm reviewing a apartment building that meets the requirements for an NFPA 13R system.
My questions: A pump is going to be required for this project and they are proposing to use a booster pump on the incoming waterline at the property line to reach the required pressure for domestic and fire demands.
Is a combined domestic/fire pump like this allowed?
It would be a private pump.
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9/9/2021 07:09:48 am
9/9/2021 08:13:10 am
Alex beat me to it. A single pump is permitted (as Alex explained in detail) and often has a reliability advantage because when there is a problem, it is immediately detected by those using the domestic water in the building. Therefore, it is more likely to be fixed when there is a problem.
9/9/2021 08:28:33 am
If the pump isn't dedicated to fire protection is it still inspected, tested, and maintained according to NFPA 25? The reliability of the pump is one thing in terms of "I know the pump turns on because my toilet still flushes", but NFPA 25 has prescriptive requirements for measuring flow and pressure (amongst other requirements) and comparing those readings against system demand and nameplate/original curve data. Not performing those inspection and test requirements wouldn't identify that the pump has degraded performance and now potentially does not meet system demand. In my experience with the hundreds of pumps we provide ITM on, the pump almost always "turns on and moves some water" but then fails to meet the requirements prescribed in NFPA 25 for performance.
9/9/2021 08:17:10 am
To piggyback off of Alex's comment,
9/9/2021 08:35:07 am
Alex beat me as well.
9/9/2021 09:08:07 am
As an AHJ my first question would be, is the pump required to meet the demand of the sprinkler system, or is it required to meet the demand of the domestic water? If it is needed to meet the demand of the sprinkler system, then I think NFPA 20 would apply.
9/9/2021 11:19:27 am
They make domestic water automatic shutoff valves when the fire system activates.
9/10/2021 12:44:35 pm
Maybe check the Econo RFP System residential fire protection pump? It's designed for 13D systems more than 13R, but it's a specific residential fire pump.
9/10/2021 12:50:54 pm
Disregard this. 13R 9.4 directs fire pumps to be in accordance with NFPA 20. 13D does not have as strict requirements.
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