So the combined flow of the 2 sprinklers on the arm-over is about 42 GPM I would guess? If you run that flow through 1.25" as compared to 1", what did you save in that single segment, about 5 or 7 PSI? More?
I'm still at home here on the West Coast so don't have my reference books handy but if you were to raise the flow of all the sprinklers in a dry pipe design area by an arbitrary 5 to 7 PSI (or whatever the difference is), that additional overflow is what's driving the higher loss of the overall system. SL Sent from my Verizon, Samsung Galaxy smartphone -------- Original message -------- From: Brian Harris <[email protected]> Date: 1/30/18 6:13 AM (GMT-08:00) To: [email protected] Subject: RE: Is this remotely possible ?? Steve- .20 @ 12.755psi Brian Harris, CET BVS Systems Inc. bvssytemsinc.com<http://bvssystemsinc.com/> From: Sprinklerforum [mailto:[email protected]] On Behalf Of Steve Leyton Sent: Tuesday, January 30, 2018 8:40 AM To: [email protected] Subject: Re: Is this remotely possible ?? What's the minimum end sprinkler flow? Sent from my Verizon, Samsung Galaxy smartphone -------- Original message -------- From: Brian Harris <[email protected]<mailto:[email protected]>> Date: 1/30/18 5:25 AM (GMT-08:00) To: [email protected]<mailto:[email protected]> Subject: Is this remotely possible ?? I have a calculation for a dry system that is currently -2.945 psi (-19.8%) over the curve. My most demanding head is one of (2) heads on a 1” arm-over, if I change the section of pipe (7’-6” long) that feeds this head to 1-1/4” my calc changes to +24.168 psi (136.8%) under the curve. Seems fishy to me, thoughts? Brian Harris, CET BVS Systems Inc. Design Manager bvssystemsinc.com<http://bvssystemsinc.com/> Phone: 704.896.9989 Fax: 704.896.1935
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