In light & ordinary hazards it's usually not a big deal as long as you've accounted for elevation differences. 400 gpm flowing through a thousand feet of 8" DIP equates to a little over 1 psi friction loss.
On Thu, Jun 19, 2014 at 6:53 AM, Mark A. Sornsin, P.E. < [email protected]> wrote: > Brian - I suspect he is misguided (or he misunderstands) based on > confusing the rules for looped city mains with mains that are dead end. As > a general rule, if your test was taken off looped mains, then you wouldn't > have to take the calcs back to the gauge hydrant because the supply flow > comes from different directions. I can easily see someone taking that as > an absolute rule - especially if they only design systems off well looped > mains in the middle of cities. > > Yet another reason why third party engineers supposedly responsible for > sprinkler specs should be the ones either conducting, overseeing, or at > least approving the hydrant flow test for a project (assuming they are > competent, of course, which really IS supposed to be the baseline > assumption...). It can be difficult to bid and win a project supplied off > a dead-end main when your competition is under the assumption that they can > take that flow test from 1,000 ft. upstream and apply it to the point of > connection to the main. > > Mark A. Sornsin, P.E. | Karges-Faulconbridge, Inc. | Fire Protection > Engineer | Fargo, ND | direct: 701.552.9905 | mobile: 701.371.5759 | > http://www.kfiengineers.com > > -----Original Message----- > From: Sprinklerforum [mailto: > [email protected]] On Behalf Of Brian Harris > Sent: Thursday, June 19, 2014 8:19 AM > To: [email protected] > Subject: Location of Flow Test in Calc's > > Was just told by one of our new designers that he was taught that it > didn't matter where the flow test was taken on the underground that you > just need to take it back to the tie in point at the main & that everywhere > he's worked does it that way. News to me, any of you guys do it that way? > If so how do you account for the loss in the underground to the test > hydrant, elevation, etc.... ? > > Brian Harris, CET > BVS Systems Inc. > Sprinkler Division > bvssystemsinc.com<http://bvssystemsinc.com/> > Phone: 704.896.9989 > Fax: 704.896.1935 > > _______________________________________________ > Sprinklerforum mailing list > [email protected] > > http://lists.firesprinkler.org/listinfo.cgi/sprinklerforum-firesprinkler.org > > ______________________________________________________________________ > This email has been scanned by the Symantec Email Security.cloud service. > For more information please visit http://www.symanteccloud.com > ______________________________________________________________________ > > ______________________________________________________________________ > This email has been scanned by the Symantec Email Security.cloud service. > For more information please visit http://www.symanteccloud.com > ______________________________________________________________________ > _______________________________________________ > 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
