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] > <javascript:_e(%7B%7D,'cvml','[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] >> <javascript:_e(%7B%7D,'cvml','email:[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] >> <javascript:_e(%7B%7D,'cvml','[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] >> <javascript:_e(%7B%7D,'cvml','[email protected]');> >> >> >> >> *From:* Sprinklerforum [ >> mailto:[email protected] >> <javascript:_e(%7B%7D,'cvml','[email protected]');>] >> *On Behalf Of *Zachary Siegrist >> *Sent:* Wednesday, May 18, 2016 3:42 PM >> *To:* [email protected] >> <javascript:_e(%7B%7D,'cvml','[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] >> <javascript:_e(%7B%7D,'cvml','[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] >> <javascript:_e(%7B%7D,'cvml','[email protected]');>http://lists.firesprinkler.org/listinfo.cgi/sprinklerforum-firesprinkler.org >> >> >> >> _______________________________________________ >> Sprinklerforum mailing list >> [email protected] >> <javascript:_e(%7B%7D,'cvml','[email protected]');> >> >> http://lists.firesprinkler.org/listinfo.cgi/sprinklerforum-firesprinkler.org >> >>
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