How to choose an electromagnetic flowmeter for concentrated sulfuric acid
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This post was last edited by lf7960621 on 2017-12-25 at 15:00. Our company has a tank containing concentrated sulfuric acid, and we need to install an electromagnetic flowmeter in it. The flow rate resulting from the gravity of the concentrated sulfuric acid itself in the tank isn’t very high. We currently have two spare flowmeters: one with a DN40 flanged tantalum electrode (this one can be used, but there’s concern that the flow rate might be too low to allow for accurate measurements), and the other with a DN25 flanged 316L electrode. I would like to ask whether the 316L electrode can be used in conditions involving concentrated sulfuric acid at room temperature The flow rate is approximately 0.5–1 m3/h
Can a 316L electrode be used in concentrated sulfuric acid at room temperature? The electrode material grade is low, although the process pipes are also 316. When selecting a material, stainless steel is not recommended for concentrated sulfuric acid at room temperature; platinum is the best choice. Tantalum is not suitable for use with fuming sulfuric acid; however, there are reports indicating that it can be used with ordinary concentrated sulfuric acid.
I agree with the view from the second floor – 316L electrodes definitely won’t work. Our company uses tantalum electrodes for concentrated sulfuric acid; however, the flow rate should not be less than 0.3 m/s
The 316L electrode is not suitable; don’t waste the flow meter – change the diameter and select an appropriate electrode material
H-C is used for concentrated sulfuric acid electrodes, tantalum for hydrochloric acid, and H-B for dilute sulfuric acid
Choose DN10 or DN15; do not select 316 material, and tantalum electrodes don’t cost much more.