I would make all 500' of the FDC supply pipe 4" John because that is the riser size based on the calculated system demand. I would put the check as close as possible to the manifold though so things don't get slammed around when the heros hit that Storz with their pump.
Brad . On Feb 14, 2017 3:14 PM, "John Paulsen" <[email protected]> wrote: > Brad: > > > > No, Evelyn did right by ya, but that section is what is causing my > conflict. The largest riser is 4”, so the FDC line should also be 4”. But > the point of the water flow test is less than 100’ feet away from the riser > vs the FDC which over 500’ away. The added friction loss from the front of > the store is causing the problem. Guess I increase to 6” huh…. > > > > John P > > Crown FSD > > *From:* Sprinklerforum [mailto:[email protected]. > org] *On Behalf Of *Brad Casterline > *Sent:* Tuesday, February 14, 2017 3:56 PM > *To:* [email protected] > *Subject:* Re: Yard FDC Supply Line > > > > John, > > Look at 13 (2013) A.8.17.2.3 > > That should do it, right? > Or is the Evelyn Wood adult ed speed reading course I took years ago > messing me up here? > > Brad > > On Feb 14, 2017 2:32 PM, "John Paulsen" <[email protected]> wrote: > > Afternoon all! > > > > I am trying to respond to a project engineers review letter questioning > the size of the supply line for the FDC connection. > > > > First, the facts: > > > > Hazard – Big Box Grocery > Store > > Systems - 3 Wet Grid systems > fed by 2, 3” risers and a 4” riser for the stock room area which is .39 for > 2,000 and is the greatest demand. > > FDC - 5” Stortz yard > connection in the parking lot in front of the store. The risers are located > in the rear. The site contractor has run 6” ductile > > From the FDC to a spigot piece at the front of the building and we are > proposing to connect to the spigot piece and run 4” through the store to > the riser manifold. > > Fire > > Department - I contact the local FD and obtained their standard > response pumper pressures – 150 PSI / 1,500 GPM > > > > I have reviewed NFPA-13 8.17.2 and I am trying to determine the proper > procedure for calculating the FDC line size. I can configure the source of > supply as the FDC with the pumper output as the supply curve, remove the > municipal water supply and the results show that this meets the demand for > 2 of the 3 systems. The greatest demand system (the Stock Room) is 13 PSI > over the curve for the FDC supply. > > > > I have always sized the FDC Connection as 4” or the size of the largest > riser pipe and as a “supplemental supply” to be used in conjunction with > the city water supply, not an alternative source independent of the > municipal supply. The only thing that I can find that would seem to support > the Engineer’s position is 8.17.2.4.7.2 which calls for a sign at the FDC > telling the responders the required inlet pressure (above 150 PSI) required > to meet the greatest demand. There is nothing in 8.17.2.3 that says the > size is determined by the greatest system demand. > > > > The way I am seeing this right now, I have two choices: > > > > 1.) Increase the interior 4” to 6” as the engineer wants. > > OR > > 2.) Have a sign installed on the FDC asking for 175 PSI inlet pressure > (After getting AHJ blessing of course) and hope the engineer will accept > it. > > > > Now I ask for other opinions from my learned colleagues. > > > > Thanks, > > > > John Paulsen – SET > > Crown Fire System Design > > 6282 Seeds Rd. > > Grove City, OH 43123 > > P – 614-782-2438 <(614)%20782-2438> > > F – 614-782-2374 <(614)%20782-2374> > > C – 614-348-8206 <(614)%20348-8206> > > > > > > > > > > > _______________________________________________ > 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 > >
_______________________________________________ Sprinklerforum mailing list [email protected] http://lists.firesprinkler.org/listinfo.cgi/sprinklerforum-firesprinkler.org
