the 4" not flowing full would explain it -----Original Message----- From: Sprinklerforum [mailto:sprinklerforum-boun...@lists.firesprinkler.org] On Behalf Of Travis Mack Sent: Thursday, July 09, 2015 11:19 AM To: sprinklerforum@lists.firesprinkler.org Subject: Re: Water Flow Information
They can't be getting the same readings. It is a reporting error by the user providing the information. I see water authorities reporting flow test data wrong frequently. Many incorrectly apply or don't apply at all the pumper modification for times when flowing the pumper outlet. Travis Mack, SET MFP Design, LLC "Follow" us on Facebook: https://www.facebook.com/pages/MFP-Design-LLC/92218417692 Send large files to MFP Design via: https://www.hightail.com/u/MFPDesign Sent from my iPhone > On Jul 9, 2015, at 9:16 AM, Chad Matthews <c...@norcalfire.com> wrote: > > Thats what I always thought, it doesn't make sense that they're getting the same pitot readings out of the 4" that they are the 2.5". > What am I missing? > > To answer Matt's question, no I don't believe they're flowing them at the same time. > > > Chad Matthews > Nor-Cal Fire Protection, Inc > 16840 Joleen Way #A > Morgan Hill, Ca 95037 > (408)776-1580 > www.norcalfire.com > > -----Original Message----- > From: Sprinklerforum [mailto:sprinklerforum-boun...@lists.firesprinkler.org] On Behalf Of Travis Mack > Sent: Thursday, July 09, 2015 9:09 AM > To: sprinklerforum@lists.firesprinkler.org > Subject: Re: Water Flow Information > > If static/residual/pitot are the same from 4" and 2.5" ports I would be questioning the results. A 25 psi pitot on 2.5" and 4" are very different flows. This would cause for a different residual pressure in most systems. > > Travis Mack, SET > MFP Design, LLC > "Follow" us on Facebook: https://www.facebook.com/pages/MFP-Design-LLC/92218417692 > Send large files to MFP Design via: > https://www.hightail.com/u/MFPDesign > > Sent from my iPhone > >> On Jul 9, 2015, at 9:06 AM, Chad Matthews <c...@norcalfire.com> wrote: >> >> Is there is specific requirement when receiving water flow data, that >> I use the information as it flows from the 2½ outlet of a fire hydrant? >> >> >> >> I ask because from a certain jurisdiction they give us the water flow >> info from the 2½ outlet and the 4 outlet, the static, residual, and >> pitot pressures are the same, but there is a big difference in the GPM >> which dramatically effects my water flow curve. Its quite a bit more >> GPM when flowed from the 4 outlet. Conservatively speaking, I >> recognize its safer to design to the smaller supply but Im having >> trouble understanding the difference I guess. >> >> >> >> Thanks! >> >> >> >> >> >> >> >> Chad Matthews >> >> Nor-Cal Fire Protection, Inc >> >> 16840 Joleen Way #A >> >> Morgan Hill, Ca 95037 >> >> (408)776-1580 >> >> www.norcalfire.com >> >> >> >> _______________________________________________ >> Sprinklerforum mailing list >> Sprinklerforum@lists.firesprinkler.org >> http://lists.firesprinkler.org/listinfo.cgi/sprinklerforum-firesprinkl >> er.org > _______________________________________________ > Sprinklerforum mailing list > Sprinklerforum@lists.firesprinkler.org > http://lists.firesprinkler.org/listinfo.cgi/sprinklerforum-firesprinkler.org > > _______________________________________________ > Sprinklerforum mailing list > Sprinklerforum@lists.firesprinkler.org > http://lists.firesprinkler.org/listinfo.cgi/sprinklerforum-firesprinkler.org _______________________________________________ Sprinklerforum mailing list Sprinklerforum@lists.firesprinkler.org http://lists.firesprinkler.org/listinfo.cgi/sprinklerforum-firesprinkler.org _______________________________________________ Sprinklerforum mailing list Sprinklerforum@lists.firesprinkler.org http://lists.firesprinkler.org/listinfo.cgi/sprinklerforum-firesprinkler.org
