While in NFPA 291 note you should not have pitot pressures that high in the
first place.
Chris Cahill, P.E.
Fire Protection Engineer
Sentry Fire Protection, Inc.
763-658-4483
763-658-4921 fax
Email: [EMAIL PROTECTED]
Mail: P.O. Box 69
Waverly, MN 55390
Location: 4439 Hwy 12 SW
Waverly, MN 55390
-----Original Message-----
From: [EMAIL PROTECTED]
[mailto:[EMAIL PROTECTED] On Behalf Of
[EMAIL PROTECTED]
Sent: Wednesday, October 15, 2008 12:25 AM
To: AFSA Forum
Subject: Re: FLOW / PITOT READINGS
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
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