Response time
Jeff, most of the systems we service do not have hydraulic signs. Makes
getting adequate forward flow rates difficult. I have yet to see a sprinkler
system with provision to test FF, not one.
Todd, the building was built in 1999, probably not PS
There is a gauge on the riser, just before the backflow device.
I can get the hydrant flow using my Akron Brass flow tester.
Forest, I am trying to get all the info I need before I see the building
official.
-----Original Message-----
From: Jeff Bridges
Sent: Wednesday, November 05, 2014 2:32 PM
To: [email protected]
Subject: RE: No hydraulic name plate, no existing plans
13 years old I highly doubt this is PS system and surprise! A missing
Placard!
The 1.5" FDC means it's more than likely 13R
You have horrible pressure which I'm sure you are aware
Flow the hydrant & get the water supply info. Map out the existing pipe
(crawl the attic space) and determine the hydraulics.
All would need to be done anyways to calculate your added space.
-----Original Message-----
From: Sprinklerforum [mailto:[email protected]]
On Behalf Of Todd - Work
Sent: Wednesday, November 05, 2014 2:17 PM
To: [email protected]
Subject: Re: No hydraulic name plate, no existing plans
You can get an accurate flow test from the hydrant(s). If you need to, you
can use a gauge on the riser ahead of any check valves for a pressure
reading. Nothing else will give you an accurate reading.
Is the existing system pipe schedule? If so, you would need to do an
analysis based on the water supply requirements for PS systems in 13. If it
is PS, you can size the piping in the addition based on PS as long as PS is
maintained throughout the total system.
If you have a PS system and cannot meet the PS water supply requirements,
then you have to discuss remedies with the owner and AHJ.
Todd G Williams, PE
Fire Protection Design/Consulting
Stonington, CT
www.fpdc.com
860-535-2080 (ofc)
On Nov 5, 2014, at 4:21 PM, Forest Wilson <[email protected]> wrote:
Doesn't the AHJ tell you what you need to submit for a permit?
You'll have to calculate the addition.
Also, you can't get an accurate measurement of water supply from the 2"
main drain. There have been formula's out there with different methods but
they are not accepted as true.
On 11/5/2014 4:16 PM, Douglas Hicks wrote:
I have been asked to extend sprinkler coverage to an addition, 17.5’ long
x 13’ across. The ceiling is a cathedral ceiling, 13’ 2” at the ceiling
and 9’ 3 “ high at the sidewall. The existing sprinkler piping is behind
the 13’ wall, pointing down the 17.5’ length. No body can find plans
from the original construction, there is not a hydraulic nameplate on the
sprinkler system. The Fire Chief remembers that during construction, the
water supply was “questionable”. There is not a forward flow port so
I can not get a water GPM/psi measurement. There is a 1.5 “ FDC at the
front of the building. There is a fire hydrant across the parking lot,
about 75 feet away. The 5 year average for the static pressure is 34 psi
and the residual is 27 psi, through the main drain.
The building is about 13 years old and is a retirement home.
My concern is the lack of information about the water supply. The
building is on a hill, about the level of the municipal water tank, which
is on another hill.
Can I get an accurate reading on the water supply from the fire hydrant,
or the 2” main drain? Or should I put a Forward Flow test port in before
doing anything else? And if I do get a good water reading, I still will
not know what the system demand is. So then do I need to hire someone to
crawl the attic and take measurements of the piping?
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Forest Wilson
Project Manager
193 California St
Xenia OH 45385
Ph: 937-736-0425
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