Agree on this method
Sent from my mobile device Please excuse spelling, grammar, and auto correction. Mark Phillips Branch Manager Fire Sprinkler Design, Install, Inspections Service, Backflows, Fire Alarm Inspections 832-101 Purser Drive Raleigh NC 27603 Phone: 919-779-4010 Fax : 919-779-4014 Cell : 919-268-7587 Email : [email protected] Web : www.pyebarkerfire.com ________________________________ From: Sprinklerforum <[email protected]> on behalf of Matt Grise via Sprinklerforum <[email protected]> Sent: Tuesday, April 13, 2021 12:48 PM To: [email protected] Cc: Matt Grise Subject: RE: "Calculating" a Pipe Scheduled system for Backflow Retro [EXTERNAL] We have done it with a survey and calc of the system. Matt -----Original Message----- From: Sprinklerforum <[email protected]> On Behalf Of J H via Sprinklerforum Sent: Tuesday, April 13, 2021 11:32 AM To: [email protected] Cc: J H <[email protected]> Subject: Re: "Calculating" a Pipe Scheduled system for Backflow Retro Any takers? Does anyone retrofit backflows onto pipe scheduled systems? On Mon, Apr 12, 2021 at 2:43 PM J H <[email protected]> wrote: > Hello All, > We're retrofitting a double check into an existing pipe scheduled system. > In looking at NFPA 13 (2019) edition 19.3.2.1 in order to do this we > just need a hydrant flow test and then subtract the friction losses of > the double check and the friction loss due to elevation of the highest > sprinkler from the flow test and make sure the leftover pressure is > greater than the value of 19.3.2.1. Is that correct? > > JH > > _______________________________________________ Sprinklerforum mailing list [email protected] https://linkprotect.cudasvc.com/url?a=http%3a%2f%2flists.firesprinkler.org%2flistinfo.cgi%2fsprinklerforum-firesprinkler.org&c=E,1,29r2XxEqlHBo3nq7rLVlT9kH_K32MEjIGiQgl1foHyElJRhDf6crebV3tdMGLhtNfl-c1Ox5adwGR1LCgH9fb5lnhgvweQJ2l2LSaASw1OX5knp_S5XB&typo=1 _______________________________________________ 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
