Last week someone asked a great question about the limits of where NFPA 20 starts and stops.
In a similar vein, what are the limits of where NFPA 22 and NFPA 24 start and stop for a typical system with a water storage tank, fire pump and private mains? We had a question at work yesterday as to whether NFPA 24 or NFPA 22 applies to pipe before a water storage tank. It'd be helpful for us to understand these limitations in addition to the conversation last week. Thanks in advance! Sent in anonymously for discussion. Click Title to View | Submit Your Question | Subscribe
7 Comments
Dan Wilder
11/9/2023 07:47:56 am
As 24 sends you to 22, I would say the supply fitting to the tank is the delineator.
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Glenn Berger
11/9/2023 08:24:33 am
NFPA 22 - Flanges at the tank wall is where my specs has the start and stop points.
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Dwight H Havens
11/9/2023 09:16:04 am
NFPA 24 - I've had issues with the "5-foot outside the building footprint", which is the traditional (and probably code) delineation between the civil designer and the fire protection of plumbing designer responsibilities. Usually, who is responsible for the connection tying the civil underground and the fire protection underground together. I greatly prefer having a flange 1-foot above the finish floor as the delineation point.
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Anthony
11/9/2023 01:42:16 pm
I agree with the 1'-0 AFF as that is often where the pipe type changes.
Julie
11/9/2023 09:19:59 am
This came up recently in my jurisdiction. The question being, is an OS&Y required on the water storage tank supply line before the tank? There was some question of which standard applies. Clearly that is a single failure point that if closed, could inhibit the fire suppression system. The argument was as long as the water storage tank has a water level indicator, that there should be enough water in the tank for needed fire flow/system operations for a few hours. There is also a chance that the tank becomes empty and damages the fire pump. Ultimately, we decided to require the valve to be indicating (OS&Y), but I'm curious of other peoples' take on this scenario.
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Jesse
11/9/2023 12:02:54 pm
I think that state and local entities get a vote too.
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sean
12/31/2023 11:23:26 pm
nfpa 24 at the transition from below ground to aboveground. backflow is an easy transition point
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