Issues related to corrosion protection of heat exchangers
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I have recently designed several fixed-tube-sheet heat exchangers, with the materials used for the tube side and shell side being 316L. The diameter of these devices is quite small, at 219 mm and 325 mm respectively. Could these heat exchangers be subjected to acid washing and passivation? If so, can they be tested using the blue spot method? Could someone with more experience give me some advice? Thank you
Our tube side is made of 304 steel, while the shell side is made of carbon steel; water flows through the shell side and CO2 flows through the tube side. Only passivated air with an oxygen content of 0.35% is introduced at the system’s inlet.
There are two heat exchangers in which the fluid flowing through the tube side is soft water, while the fluid flowing through the shell side is fatty acids； There’s another one that’s exactly the opposite.
In the shell side with a fixed tube sheet, it is not possible to carry out acid washing and passivation on the outer walls of the heat exchange tubes, nor can the blue spot test be performed