Flow Demand for Wall Hydrant in Calculation?

12/4/2018

A fire marshal is requesting a wall hydrant on the backside of a project where there is limited access. Is there a prescriptive flow that needs to be calculated at this location?

This project is considered a high-rise (8 stories) and does have a fire pump. He has already requested there be 100 psi available at the wall hydrant.

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4 Comments

Mike

12/4/2018 10:18:12 am

Probably 500 GPM as the most remote standpipe or 250 GPM which is the next lower. If AHJ gave the 100 psi minimum, I'd ask for the flow too.

M. Allen

12/4/2018 10:25:06 am

Refer to NFPA 14 - 7.10.1.1 for flow rates. It depends on the class of the standpipe and number of standpipes,

WES

12/4/2018 01:34:17 pm

Is a wall hydrant subject to the same flow and pressure requirements as a standpipe hose connection though?

12/4/2018 01:32:19 pm

Per NFPA 14 - 7.10.2: you only need to flow 250 GPM at the most remote hose valve.
However, you need to have 250 GPM (@ 100 PSI) while simultaneously flowing and additional 250-1000 GPM elsewhere, depending on your system. See 7.1.1 and 7.1.2 for details.

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