Non contact flowmeters
http://www.flowmeterdirectory.com/flowmeter_artc/flowmeter_artc_03112701.htm
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Ceramic-lined
Ceramic magnetic flowmeters have abrasion-resistant liners typically made of alumina ceramic instead of the typical elastomer linings usually found in magnetic flowmeters. They often permit higher temperature operation, and because their electrodes are typically part of the ceramic substrate, they tend not to offer a leak path between the electrode and liner.
Electrodeless
So-called âelectrodelessâ magnetic flowmeters employ electrodes that are not
in direct contact with the fluid. These electrodes are either embedded in
the liner or located behind the liner, and are usually
capacitatively-coupled to the flowing liquid.
-----Original Message-----
From: Steve McKenzie [mailto:mechproj@xtra.co.nz]
Sent: Sunday, April 25, 2004 11:45 PM
To: PipingDesign@yahoogroups.com
Subject: [PipingDesign] Flowmeter for hot Fluosilicic Acid
Hi there
I am having trouble finding a reliable flowmeter for HFA pH about 1, around 90 deg C, lots of solids. Its a killer brew - seems to attack anything hard and migrate through anything soft except vinyl ester and virgin teflon. Installation is at a Superphosphate manufacture plant.
Magflows have the Hastelloy C electrodes eaten away. Am dubious about ultrasonic - suspect inevitable solids deposits on the pipe wall will cause problems. Same for calometric. Mass flowmeters are a bit dear and the guts would rot out.
System is under pressure so I cant use a weir and level transmitter.
Was wondering about a bend meter with flushed DP tappings.
Any bright ideas out there?
Also pumps for same. Have tried Durco Hastelloy C (corrosion/erosion failure, Ash elastomer lined (migration of fluoride to shell). currently using Coro FRP - chemically OK but it will abrade/fatigue away
Cheers
Steve
Yahoo! Groups Links Received on Mon Apr 26 14:09:00 2004
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