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? >> >> >> >> _______________________________________________ >> Sprinklerforum mailing list >> [email protected] >> http://lists.firesprinkler.org/listinfo.cgi/sprinklerforum-firesprinkler.org > > > -- > Forest Wilson > Project Manager > 193 California St > Xenia OH 45385 > Ph: 937-736-0425 > > ///WHO IS JOHN GALT?/// > > ******This email and any files transmitted with it are confidential and > intended solely for the use of the individual or entity to whom they are > addressed. If you have received this email in error please notify the system > manager. This message contains confidential information and is intended only > for the individual named. If you are not the named addressee you should not > disseminate, distribute or copy this e-mail. Please notify the sender > immediately by e-mail if you have received this e-mail by mistake and delete > this e-mail from your system. If you are not the intended recipient you are > notified that disclosing, copying, distributing or taking any action in > reliance on the contents of this information is strictly prohibited.*** > > _______________________________________________ > Sprinklerforum mailing list > [email protected] > http://lists.firesprinkler.org/listinfo.cgi/sprinklerforum-firesprinkler.org _______________________________________________ Sprinklerforum mailing list [email protected] http://lists.firesprinkler.org/listinfo.cgi/sprinklerforum-firesprinkler.org
