What material should be used for high-temperature dilute sulfuric acid pipelines?
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What material would be suitable for pipes carrying dilute sulfuric acid at a temperature of 150 degrees and with a concentration of around 20%? Currently, carbon steel pipes coated with a protective layer have been in use for about half a year, and corrosion and perforations have occurred in many places, resulting in high maintenance costs.
Steel-lined glass pipes and fittings can be used; they are resistant to temperatures up to 420 degrees and to strong acids. It performs very well in our systems for acid waste concentration, acid production from flue gas, and nicotinic acid production. 18653467005
Zirconium for dilute acids, tantalum for concentrated acids – excellent quality
The temperature resistance of fluorocarbon coatings is an issue; when using metal, materials such as Alloy 20 or higher are required. With acrylic coatings, the temperature limit is around T150°C, and corrosion in such conditions is no joke – it’s impossible to use carbon steel in such situations. . .
It’s carbon steel with plastic sprayed on the surface, but this plastic doesn’t last more than about half a year; its lifespan is too short and the cost is also high
Steel-lined PTFE was also considered, but it is expensive, and it doesn’t work well with thermal expansion and contraction
So far, I have only been in contact with enamel-lined reaction vessels; I’m not sure how they are used in pipelines