Duane- I've sent him a copy of our calc's showing exactly what you described with the flat line, he's still convinced that the added flow (250) will required more pressure. Not that it's totally accurate I told him to think of the fire truck as a pump and it was providing the pressure for the outside hose streams...
Brian Harris, CET BVS Systems Inc. bvssytemsinc.com -----Original Message----- From: Sprinklerforum [mailto:[email protected]] On Behalf Of Duane Johnson Sent: Tuesday, November 18, 2014 2:05 PM To: [email protected] Subject: RE: Hose added to calc's. no PSI We allow for the fire department to fight the fire while the sprinklers are activated. So, while the sprinklers are flowing at X psi @ Y gpm, the fire department will open up a fire hydrant to flow additional gpm. The pressure they use is less than the sprinkler requirements. Therefore we need to account for additional gpm, but not additional psi. Show him a graph with the horizontal line at the top of the sprinkler demand... Duane Johnson, PE Design Manager Strickland Fire Protection 301-474-1136 Office 301-455-0010 Cell -----Original Message----- From: Sprinklerforum [mailto:[email protected]] On Behalf Of Brian Harris Sent: Tuesday, November 18, 2014 1:59 PM To: [email protected] Subject: Hose added to calc's. no PSI I've been trying to explain to a civil engineer that we (fire sprinkler) include outside hose allowance into our calc's but only for the extra gpm, not as far as additional psi goes. I'm sure it's the way I'm trying to explain it that's not making any sense to him, can one of you more versed in the English language help me out and put it in layman's terms for me? 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 _______________________________________________ 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
