Your principal cooking chemical, formic acid, is known to be corrosive. Which materials are suitable and how does corrosion resistance affect the investment cost?
Main construction material of the process is carbon steel, following stainless (AISI 304) and acid proof (AISI 316) steels. In more corrosive conditions, duplex grades are used. Only about 1 % of piping material has to be more corrosion resistant than previous grades. The additional cost of “corrosion resistant” materials is minor in pulp mill project.
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