I’m adding to Steve’s comment. I would be quite against including friction loss and head pressure between the engine and the FDC. That is the pump operator’s responsibility. I might say dead set against, which might not be normal for me.
Yes, 150 will often be the initial actual pump pressure. Show water, do field hydraulic calcs, throttle up slowly. I’d add 25 to initial above 4th floor to initial. There’s two outcomes. Either not counting bleeding air, the fire is knocked down with less than a minute’s total flow on the fire. Most common event. Or you’re going to be directed by radio to raise pressure. We’d raise 25 on first call. 15 psi for second request. Our field hydraulics system were easy and memorized. You’re not going to pass rookie, 2nd year, 3rd year, or journeyman’s test without. Let alone now engineer’s exams. Best. Bruce Verhei > On Aug 27, 2018, at 13:08, Steve Leyton <[email protected]> wrote: > > Pumping operations will almost always start at 150 psi unless the engineer > chooses to follow signage directive if one is provided. > > You are correct that there will be 2-way communications between attack crew > and the engineer, and if more or less pressure is desirable it will be > provided. A fire department will pump an FDC until it fails if there is a > call for more pressure during an operation. > > > > Steve Leyton > > (Sent from my phone; please excuse typos and voice text corruptions.) > > > > -------- Original message -------- > From: "Kyle.Montgomery" <[email protected]> > Date: 8/27/18 3:55 PM (GMT-05:00) > To: [email protected] > Subject: RE: Fire Truck Supply @ FDC > > That makes sense. I don’t think testing at 225 psi would be a big deal, > although I could definitely see someone forgetting to do that. > > As far as Tom’s comments about the placard, I understand it, but I’m > wondering how much this really matters from a practical standpoint (I > obviously have zero experience manually fighting a fire). Could the operator > not start out at 150 psi, and if the guy on the end of the hose needs more > pressure, he just radios for some more pressure? That’s the part that I’m > missing, because it seems like the fire department would simply make > adjustments to the pressure they are supplying based on need, regardless of > what the placard says. Is it more complex than that in the field? > > -Kyle M > > From: Sprinklerforum [mailto:[email protected]] > On Behalf Of Steve Leyton > Sent: Monday, August 27, 2018 12:21 PM > To: [email protected] > Subject: [EXTERNAL] Re: Fire Truck Supply @ FDC > > 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 > > 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 > _______________________________________________ > Sprinklerforum mailing list > [email protected] > http://lists.firesprinkler.org/listinfo.cgi/sprinklerforum-firesprinkler.org
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