OK but don't a vast majority of this list know the ball park of the flow. OHII = 300 + 10-20%. If you forward flow test a pipe schedule at 350 are you good? Let's crank it open to 400 and again I don't think anyone, even the lawyers, would have a beef if you forward flowed more than required. For the most part these flow points are off the riser, right? All that elevation, end head pressure and friction loss in the pipe is turned into GPM.
If you can't get to 400+ don't you think maybe you should be asking different questions? If you can't get 400 at the riser what are the odds you can get OHII at the remote area? You are allowed all the judgment you want in the buildings that don't burn down. Feel free to use it at will. You are allowed no judgment in the ones that burn down. Don't use any in those. Isn't it that simple? LOL. Chris Cahill, P.E. Fire Protection Engineer Sentry Fire Protection, Inc. 763-658-4483 763-658-4921 fax Email: [email protected] Mail: P.O. Box 69 Waverly, MN 55390 Location: 4439 Hwy 12 SW Waverly, MN 55390 -----Original Message----- From: [email protected] [mailto:[email protected]] On Behalf Of Matthew J. Willis Sent: Tuesday, December 22, 2009 4:45 PM To: [email protected] Subject: RE:Retro Backflow > On a more important matter: If a system was retrofitted with a backflow, and > there is no hydraulic calc plaque attached to the riser, and NFPA requires > forward flow testing of backflows, how can you conduct the test without a > benchmark to test against? > > What is the recommended practice in this scenario? > Forest Wilson >Add the cost of surveying and calcing the system to your bid. > Ron You are supposed to do this anyway. See 8.16.4.6.2 (02 edition) The annex goes on to mention schedule systems are not required to be calculated, but the water supply still must be verified... R/ Matt Matthew J. Willis, CET Automatic Fire Sprinklers Norred Fire Systems L.L.C. 318-387-1134 Voice 318-387-1163 Facsimile [email protected] -- _______________________________________________ Sprinklerforum mailing list [email protected] http://fireball.firesprinkler.org/mailman/listinfo/sprinklerforum For Technical Assistance, send an email to: [email protected] To Unsubscribe, send an email to:[email protected] (Put the word unsubscribe in the subject field) _______________________________________________ Sprinklerforum mailing list [email protected] http://fireball.firesprinkler.org/mailman/listinfo/sprinklerforum For Technical Assistance, send an email to: [email protected] To Unsubscribe, send an email to:[email protected] (Put the word unsubscribe in the subject field)
