I have just used the # / size of test header valves for a fire pump test to do
the forward flow test capacity. I will use (1)2½” hose valve for up to 450 gpm
(150% capacity of a 300 gpm pump), (2) 2½” hose valves for up to 750 gpm and
(3) 2½” hose valves for up to 1000 gpm. I put these on a va
I am not a fan of blanket answers - but in this case I see 2 simple
solutions:
If SYSTEM FLOW is the goal:
A simple requirement such as 2½" valve for every 250 gpm of system demand
if the riser is 2½" or larger, and to match the backflow diameter if
smaller than 2½" riser. For instance, 2" drain
If it's serving a sprinkler system only and the main drain cannot flow a
high-enough volume to match system demand, then you have to configure a means
of testing that will, whether it's on the building or underground. If the
building is equipped with a fire pump and/or standpipes, you can chec
You'll probably get some pretty diverse answers depending on how one views the
intent behind the provision. The commentary advises using the full diameter of
the riser as the outlet size to theoretically allow the test to be performed
without needing to measure the flow with a pitot or hose mons
Sounds like this falls under 16.14.5.1.3*
Open 1 for the main drain test, open 2 or more for the backflow test.
[cid:image002.jpg@01D90FB9.004B1FB0]
From: Hinson, Ryan
Sent: Wednesday, December 14, 2022 12:16 PM
To: Discussion list on issues relating to automatic fire sprinklers
Subject: [Spr
NFPA 13 (2022) Section 16.4.5 with ‘enhanced content’ and some new standard
language, discourages this practice. How will the requirement of Section
16.14.5.1.1 be achieved without additional calculation?:
16.14.5.1* Backflow Prevention Valves.
A test connection shall be provided downstream of
On backflow testing, NFPA 13 (2019) 16.14.5.1 states the backflow needs to be
tested at system demand.
I have a hard cover copy, and in it the question was asked, if a 2" main drain
would be sufficient, to do the backflow test.
After their explanation, they say it basically needs to be the same s
