Material required for the tank wall in chlorine-containing media
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I need to store chlorinated media, liquids, as well as H2S. I would like to know what material is suitable for using in such tanks. Should carbon steel be used with a thicker corrosion resistance layer, or should an inner lining be installed? Those who have experience with this could share their insights. Thank you
Doesn’t it need to be considered whether Cl- corrodes stainless steel? Which specific grade of stainless steel should be chosen? According to Article 98 of the Code, during the hydrostatic testing of austenitic stainless steel pressure vessels, the chloride content in the water must be strictly controlled – how should this be understood? This post was last edited by clguan on 2009-3-25 20:38]
Austenitic stainless steel cannot be used; could we choose carbon steel with a greater corrosion allowance?
For chlorine-containing liquids, it depends on whether chloride ions are formed. If so, austenitic stainless steel should not be used. Carbon steel or low-alloy steel can be chosen; in the presence of hydrogen sulfide, heat treatment may need to be considered.
Carbon steel is a better choice, but reasonable heat treatment requirements must be specified. Media containing Cl almost always produce Cl ions; therefore, stainless steel poses a significant risk
If the medium contains chloride ions, austenitic stainless steel must not be used. There seems to be a misconception regarding this issue; when it comes to corrosion resistance, many people think of stainless steel. In fact, there are also strict requirements regarding the media suitable for stainless steel. Returning to the original question, I think that if there are chloride ions present and the medium is acidic, the best option is a lining (rubber, F40, etc.); storage tanks for hydrochloric acid at normal pressure are usually made of fiberglass-reinforced plastic. Of course, if this device is not very important and the acidity level is not high, it is entirely feasible to choose carbon steel (of course, a thicker wall thickness would be better).