Brad said to check w/ the pump manufacturer so I don't know what the all the keyboard punching is about. I thought it was a nice outside the box approach. The manufacturer offers different size impellers for a reason. Feasible or not I don't know - call the pump guys to find out.
Anthony <https://www.avast.com/sig-email?utm_medium=email&utm_source=link&utm_campaign=sig-email&utm_content=webmail&utm_term=icon> Virus-free. www.avast.com <https://www.avast.com/sig-email?utm_medium=email&utm_source=link&utm_campaign=sig-email&utm_content=webmail&utm_term=link> <#DAB4FAD8-2DD7-40BB-A1B8-4E2AA1F9FDF2> On Mon, Jul 16, 2018 at 1:54 PM, Steve Leyton <[email protected]> wrote: > You gotta let go of this Brad. You're now having a visual fantasy about > what can only be described as a reach at best or more critically, a bad > practice. Please go back to thermal layers or something ... this is > ridiculous. Have you given the future impeller an actual name for the > plate, or would that be a blank that's just put in the cabinet so it can be > appropriately named by whoever swaps it out? > > I have gotten calls from people (including attorneys) who have found and > to varying extents vetted me using web searches. I recently got hired to > present a seminar series for the FD of one of the largest cities in the USA > because they found me on the web; they told me that my name association > with AFSA and NFPA conventions caught their eye and they also saw excerpts > of posts I've made to the forum regarding standpipes. You should Google > "Brad Casterline Sprinklerforum" ... it's long list of hits. The stuff we > say on this forum isn't confined to the subscribers on the list-server. > > So if/when somebody finds this stream-of-consciousness and decides to use > the now-and-future impeller basis of design, and then they get sued ... > you can send your formulas to their defense team I suppose. I'm > intentionally being histrionic and sarcastic but it's to make a point: We > need to promote best practices here. This is an exchange of ideas, yes. > But we cannot allow the conversation to turn to the purely speculative or > the convenient or two an unsafe level of compromise. This association, > this forum and we as industry activists are the means to setting the > standard of care higher. We strive do it right, ESPECIALLY when nobody's > watching. > > I think it's time to put the impeller-in-a-cabinet idea into a permanent > sleep. > > > SML > > > > > > -----Original Message----- > From: Sprinklerforum [mailto:[email protected]. > org] On Behalf Of [email protected] > Sent: Monday, July 16, 2018 1:19 PM > To: [email protected] > Subject: Re: PRV after pump discharge control valve > > Thank you Kyle, it means a great deal to me for you to say. > I was curious about the application too, and saw a 1250 gpm, 2600 rpm > with a range of 69 psi based solely on impeller diameter. > Both impellers would need to be purchased and certified up front, and > every one having signed off on the idea. > I even imagined a note on the enlarged pump room plan, "mount future > impeller and name plate in locked cabinet next to spare sprinkler > cabinet". > > Brad > Quoting "Kyle.Montgomery" <[email protected]>: > > > I found the formula interesting. > > > > Also, I didn't think that Brad was suggesting the fitter would > > modify the impeller (were you?). I assumed he was just showing that > > it was another possibility to explore (to be performed by pump rep). > > You wouldn't modify the existing impeller, but replace it with a new > > one. > > > > I do know it is possible (and not entirely uncommon) to have the > > pump manufacturer "trim" the impeller to make small modifications to > > the pump curve, to dial in the pressure. Not sure if it would work > > for the kind of pressure differences the O.P. is looking at. > > > > If it is feasible, I think that (generally speaking) it might be > > considered a preferable approach to the PRV. Less parts and pieces, > > etc. However, the nice thing about a PRV is you can really dial in > > the pressure and you get that wide, flat pressure curve. But there > > are drawbacks as well. > > > > Kyle Montgomery > > > > Aero Automatic Sprinkler Co. > > 21605 N. Central Ave. > > Phoenix, AZ 85024 > > Direct: 623.580.7820 > > Cell: 602.763.4736 > > [email protected] > > > > > _______________________________________________ > 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
