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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