Seeking help for the repair of pipeline corrosion caused by 98% concentrated sulfuric acid at 110°C
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This post was last edited by julius6054 on 2019-11-22 at 15:14. As the title suggests: seeking help with the corrosion repair of sulfuric acid pipelines at 110°C and 98% concentration; the pressure is 20 kilograms, and the current material used for the pipes is 316L.
I just checked – concentrated sulfuric acid above 50 degrees is not suitable for use with 316L. You can check the previous posts on the website
Use carbon steel or alloy No. 20
It’s being used for emergency purposes at the moment, but a 316L one will still be replaced and welded back in.
316L is surely more reliable than carbon steel; investing in grade 20 alloy steel is too costly
The design material selection manual indeed states that 316L is not suitable for such conditions.
The main problem is the scouring and erosion damage to the tees; the straight pipes are fine.
The image isn’t very clear; the brown-colored area is the worst