What anti-corrosion materials should be used for pipes containing strong bases and strong acids?
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What anti-corrosion materials should be used for pipes containing strong bases and strong acids?
For strong bases, the material to be used should be selected based on the concentration of the base and the temperature; generally, Appendix D of SH/T3059 can be referred to for making such selections. The selection of materials for strong acids also depends on the type of acid, its concentration, and the temperature; generally, when the temperature is not very high, plastic pipes or pipes lined with plastic are more commonly used. The temperature is too high; plastic pipes are not suitable, and materials such as nickel-based alloys and titanium must be used instead. API581 contains data on the corrosion of metals by certain acids, which can be used as a reference.
Strong alkalis and strong acids cause severe corrosion; just using paint probably won’t be enough. Fluorinated pipes can be used, such as those lined with PFTE
Who has the API581 standard?
It is generally lined with plastic or other lining materials.