What material should be used for pipes carrying aqueous sulfuric acid solutions?
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For an aqueous solution of sulfuric acid at around 15% concentration (pH 6–7, temperature below 100 degrees), what material should be used for the pipes? What kind of pipes are suitable? The anti-corrosion design manual states that ordinary carbon steel, as well as 304 and 321 stainless steels, are not suitable for this purpose. When we consulted some equipment manufacturers, some said it could be used while others claimed it was impossible Has anyone encountered this? Those with experience, please share your thoughts
For pipelines carrying aqueous sulfuric acid solutions at around 15%, PVC, PP steel pipes lined with plastic or glass-lined steel, or 304 stainless steel can be used at room temperature; ordinary steel pipes are definitely not suitable.
For pipelines carrying an aqueous solution of sulfuric acid at about 15%, 316L stainless steel pipes, steel-lined PTFE pipes, steel-lined PVC pipes, steel-lined PP pipes, glass-lined pipes, and similar materials can be used at room temperature.
Pipelines for aqueous solutions of sulfuric acid at around 15% concentration can use 316L stainless steel at room temperature
The key factor is temperature; below 80 degrees, FRPP should work fine. If it is 80–100 degrees, one should choose between steel-lined PTFE, steel-lined glass, or FRP.