Well you're welcome Zachary, anyway. Like Craig and Travis said, it is DEMAND driven, not AVAILABLE driven. I love NFPA 20 myself! I figured out how to calc the impeller diameter based solely on the rated psi and rpm! B On May 18, 2016 4:06 PM, "Zachary Siegrist" <[email protected]> wrote:
> Yes, I was confusing sizing the pump with determining the max capacity for > the pump. Trying to avoid dropping below 20 psi which has been a problem > in my jurisdiction. Thank you Brad for your substantive reply. > On Wednesday, May 18, 2016, Brad Casterline <[email protected]> > wrote: > >> Please brush up on NFPA 20. >> >> bc >> On May 18, 2016 2:48 PM, "Travis Mack, SET" <[email protected]> wrote: >> >>> I think he is trying to get at the max capacity of a pump so that the >>> municipal water supply doesn't go below 20 psi. So, if his factor comes to >>> a max of 1200 and the system requires a 1500 gpm pump, then a tank is going >>> to be required. That is my assumption at least. >>> >>> Travis Mack, SET >>> MFP Design, LLC >>> 2508 E Lodgepole Drive >>> Gilbert, AZ 85298480-505-9271 >>> fax: 866-430-6107email:[email protected] >>> http://www.mfpdesign.comhttps://www.facebook.com/pages/MFP-Design-LLC/92218417692 >>> Send large files to us via: https://www.hightail.com/u/MFPDesign >>> LinkedIn: https://www.linkedin.com/in/travismack >>> >>> On 5/18/2016 12:46 PM, [email protected] wrote: >>> >>> Still not sure what that is supposed to represent or what you’re trying >>> to calculate. >>> >>> >>> >>> >>> *Craig L. Prahl* >>> Fire Protection Group Lead/SME >>> *CH2M* >>> 200 Verdae Blvd. >>> Greenville, SC 29607 >>> Direct - 864.920.7540 >>> >>> Fax - 864.920.7129 >>> >>> CH2MHILL Extension 77540 >>> [email protected] >>> >>> >>> >>> *From:* Sprinklerforum [ >>> mailto:[email protected]] *On Behalf Of >>> *Zachary >>> Siegrist >>> *Sent:* Wednesday, May 18, 2016 3:42 PM >>> *To:* [email protected] >>> *Subject:* Re: Equation for sizing fire pump >>> >>> >>> >>> Sorry, I am looking at the wrong equation. That equation just ensures I >>> have 20 psi available at 159 percent. >>> >>> On Wednesday, May 18, 2016, <[email protected]> wrote: >>> >>> What are you supplying with your pump? >>> >>> >>> >>> I’m not seeing any correlation between a flow at 20 psi and sizing a >>> pump. What flow are you talking about, a municipal flow rate or what? >>> >>> >>> >>> If for sprinkler systems, you size the pump based on the characteristics >>> of the water supply and the system demands. >>> >>> >>> >>> There are ways to get an estimate on pump size but the final selection >>> better be verified through hydraulic calculations. >>> >>> >>> >>> >>> *Craig L. Prahl* >>> Fire Protection Group Lead/SME >>> *CH2M* >>> 200 Verdae Blvd. >>> Greenville, SC 29607 >>> Direct - 864.920.7540 >>> >>> Fax - 864.920.7129 >>> >>> CH2MHILL Extension 77540 >>> [email protected] >>> >>> >>> >>> *From:* Sprinklerforum [mailto: >>> [email protected]] *On Behalf Of *Zachary >>> Siegrist >>> *Sent:* Wednesday, May 18, 2016 3:23 PM >>> *To:* [email protected] >>> *Subject:* Equation for sizing fire pump >>> >>> >>> >>> Is there an equation to specify an appropriate pressure when sizing a >>> fire pump? For example, when sizing gpm, I've always taken the GPM >>> available at 20 psi divided by 1.5 to give me the maximum GPM rating of the >>> pump. I'm inquiring to see if such a formula is available to size the >>> pressure correctly. Can anyone help? >>> >>> >>> >>> Zach Siegrist >>> >>> >>> >>> _______________________________________________ >>> Sprinklerforum mailing >>> [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 > >
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