A pitot measures velocity pressure, which is converted to flow in GPM per the formula already posted by others. Residual is the pressure left in the main when it is flowing a fixed amont of water, such as might be measured with a pitot. See NFPA 291; in the standard 2 hydrant flow test, the pitot and residual are measured at separate hydrants.
Sent from my Verizon Wireless BlackBerry -----Original Message----- From: "Forest Wilson" <[EMAIL PROTECTED]> Date: Tue, 14 Oct 2008 18:42:40 To: <[email protected]> Subject: FLOW / PITOT READINGS Am I ignorant on this subject? Please let me know. If you flow a 2 1/2" hydrant, and the pitot reading is 55 psi the gpm will always be 1250. Right? (I understand you factor in the coefficient of the hydrant nozzle). My pitot gauge manufac tured by Potter shows BOTH gpm AND psi. I'm looking at a flow test paper. Through a 2.5" hydrant outlet. Residual is 90 psi @ 840 GPM. Is this possible? Forest Wilson Cherokee Fire Pro. a _______________________________________________ Sprinklerforum mailing list http://lists.firesprinkler.org/mailman/listinfo/sprinklerforum <http://lists.firesprinkler.org/mailman/listinfo/sprinklerforum> For Technical Assistance, send an email to: [EMAIL PROTECTED] To Unsubscribe, send an email to:[EMAIL PROTECTED] (Put the word unsubscribe in the subject field) � __________ Information from ESET NOD32 Antivirus, version of virus signature database 3522 (20081014)__________ The message was checked by ESET NOD32 Antivirus. http://www.eset.com <http://www.eset.com> �
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