175 is convenient, yes, so long as you test to +50 psi. For whatever it is worth, I have not yet met a fire official who wouldn't approve a design that requires up to 175 psi inlet pressure for a building not classified as high-rise.
Steve L. Get Outlook for Android<https://aka.ms/ghei36> ________________________________ From: Sprinklerforum <[email protected]> on behalf of Tom Duross <[email protected]> Sent: Monday, August 27, 2018 2:51:52 PM To: [email protected] Subject: RE: Fire Truck Supply @ FDC 175 is not out of reason at all, whether manual or automatic. You do need to make sure you don’t exceed pressure ratings of the components. Also, for traditional 150# systems that we hydro to 200# for, you would need to increase your test pressure to 50# over. I see that all the time. On thing I’ve been discussing with local AHJ’s is the placard. How is a pump operator going to know what pressure is at the FDC? I think we should be calculating loss through how ever much discharge needed for a pumper parked at the hydrant (within 150’) and the placard state discharge pressure at the piece, not the FDC. I put a gauge on the FDC when using an outside pumper but operations aren’t going to change telling FF to install a good gauge and watch it 150’ away. Just my $0.02. TD From: Sprinklerforum <[email protected]> On Behalf Of Kyle.Montgomery Sent: Monday, August 27, 2018 2:37 PM To: [email protected] Subject: RE: Fire Truck Supply @ FDC Now that’s what I’m looking for. So requiring a pressure up to 175 psi should be no big deal (adjustments for pressure to below grade levels not withstanding), but 175 psi should be the practical limit. Would you agree? Thanks, Pete. -Kyle M
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