11% corrosion issues in ferric sulfate polymeric heat exchangers
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In the tube bank of a tubular heat exchanger manufactured by the company, 11% polyferric sulfate solution (with a pH between 3 and 6) is used, at a temperature range of 90°C to 45°C. The shell is cooled by circulating water. The heat exchange tubes are made of 304 stainless steel tubes with a diameter of 19x2, and leaks occurred within less than a year; it’s unclear whether 304 material is suitable for this type of medium. I hope an expert can give some advice. Thank you.
If it is due to the material, can you specify the exact chemical reaction process?
According to the information available, for 10% sulfuric acid at a temperature of 93 degrees, the corrosion rate is 175 MM/Y... Therefore, material selection might be a significant issue; Hastelloy C-276, Hastelloy B, and Hastelloy B-2 can be used as alternatives
The material for the heat exchange tubes definitely cannot be 304.