Selection of tube bundle material for open-loop water coolers
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For the process nitrogen in the unit, a shell-and-tube heat exchanger is used: the shell side is filled with nitrogen at 20 bar, while the tube side contains circulating water at 3.5 bar. The operating temperature in the gas side is 30–50°C, while the temperature of the circulating water on the tube side is 28–32°C. The supplier has designed the tube bundle to use composite tubes, with S0408 material for the main tubes and AL as the material for the fins. During production, the circulating water uses an open-loop system; chemicals are added during operation to keep the CL level at around 100 mg/l. I would like to ask experts about the impact of this circulating water on the corrosion of the tube bundle under these operating conditions
Oh, I’m sorry. Correction: The material of the main pipe is S30408
Control the chloride ion concentration in the circulating water; otherwise, pitting is likely to occur in your heat exchange tubes, and over time those tubes will fail. Alternatively, use titanium tubes or seamless tubes.