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 Received on Mon Apr 26 01:44:00 2004