A few years ago I replaced an Annubar unit with a Preso Ellipse (www.preso.com) unit. Still a probe type sensor but may need a change of weld socket on pipe.
Russell Gregory Christchurch New Zealand From: Sprinklerforum [mailto:[email protected]] On Behalf Of Karen Lesko Sent: Wednesday, 11 May 2016 10:24 AM To: [email protected] Subject: Flowmeter for fire pump testing The existing flowmeter is leaking and is not repairable. It would be nice to get a replacement that fit into the existing hole in the pipe instead of replacing a section of piping to install a venturi. Sent using CloudMagic Email <https://cloudmagic.com/k/d/mailapp?ct=pa&cv=8.4.52&pv=5.1.1&source=email_fo oter_2> On Tue, May 10, 2016 at 6:18 PM, Brad Casterline <[email protected]> wrote: Correction - half the density, not the mass I think. And I should do some googling I guess- the old annubar stuck down through a hole in the top of the pipe like a flow switch right? Whereas you would have to cut out a section of pipe to install a venturi? On May 10, 2016 5:08 PM, "Brad Casterline" <[email protected]> wrote: I thought annubar and venturi were synonymous. Create a constriction in the flow path and apply Bernoulli's Principle: ~where the velocity of a fluid is high the pressure is low and, where the velocity of a fluid is low the pressure is high~ The change in pressure is half the mass times the velocity squared (Bernoulli's Equation). How is it broken? Something clogged up? On May 10, 2016 3:40 PM, "Karen Lesko" <[email protected]> wrote: We have a mid 1980s fire pump installation with an annubar type flowmeter on the line that recirculates to the fire water tank. The flowmeter is broken so we have been testing our fire pumps with hydrant flows. We would like to be able to do some testing with our recirculation line. Is anybody aware of a listed annubar flowmeter or do we need to switch to a venturi type? Karen Lesko Fire Protection Engineering SRR, LLC 803-221-0753 _______________________________________________ Sprinklerforum mailing list [email protected] http://lists.firesprinkler.org/listinfo.cgi/sprinklerforum-firesprinkler.org
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