Seeking help in selecting instruments
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The media to be measured are concentrated sulfuric acid, dilute sulfuric acid, and silicates. Currently, a pressure transmitter model 3051c is being used, an electromagnetic flowmeter for measuring flow rate, an E+H radar level gauge for level measurement, and a Rosemount differential pressure transmitter. The corrosive effect of strong acids on instruments was certainly taken into account during the selection process. However, there is some pressure during use now, and the diaphragm of the differential pressure transmitter has been corroded. There are no major issues with the flow meter for now; it just has slight fluctuations. The company is now carrying out technical upgrades. I would like to ask the experts: which type of instruments can withstand corrosion caused by these acids? Thank you. I’m thinking of using a 3051c pressure transmitter to measure pressure, with an isolating fluid added to the pressure conduit. Due to my limited experience, I’m not sure exactly how to do this
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When measuring such media, it is very important to specify the concentration and temperature.
This post was last edited by cqfblue on 2010-6-11 at 13:24. I have a SWAGELOK manual, which contains a corrosion table specifying the sulfuric acid concentrations; different concentrations require the use of different materials. I’m not sure what the sulfuric acid concentration you’re referring to is. Here is a simple list for reference only. 1. Excellent 2. Good, most conditions 3. Generally, it has a limited lifespan and is subject to constraints 4. Not ideal: Aluminum, Yellow, Steel, Alloy, ST, Nylon, Polyethylene, Fluorine, Chlorine, Polymers, Titanium, Copper, Gold, SF, Dragon, Ethylene, Sodium, Rubber, Butadiene, Methacrylate, Gold, Gold, Gold. 4, 3, E, Polyethylene rubber, Acetal. 6, 2, C, 0, 1 / Adhesive, Adhesive, 0, 0, 2, 0, 6, P, 0, 7, F, 6, A. Sulfuric acid: 0-7%, 1, 3, 4, 1, 2, 1, 2, 1, 1, 3, 2, 1, 2. Sulfuric acid at 20%, 4, 3, 4, 1, 4, 1, 3, 1, 2, 1, 4, 1, 3. Sulfuric acid at 50%, 4, 3, 4, 4, 4, 1, 3, 1, 3, 4, 4, 2, 4. Sulfuric acid at 100%, 4, 3, 2, 4, 1, 1, 4, 2, 4, 4, 4, 2, 4. Hydrofluoric acid, Silicon: 4, 4, 4, 1, 3, 1, 2, 1, 1. Note: This does not include all conditions such as concentration, temperature, impurities, and ventilation. It’s not listed for silicates; I’m not sure if it’s similar to seawater.