Technical assistance: Chloride ion levels in process water
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This post was last edited by hesonchang214 on 2009-9-30 08:35. Please advise: what is the maximum allowable value for chloride ions in the process circulating water at present?
This post was last edited by cdpulin on 2009-9-23 at 10:15. According to the design specifications for industrial circulating cooling water treatment, for open-loop intercooling systems: Project, Unit, Requirements or operating conditions, Allowable values. Cl- mg/L: For carbon steel and stainless steel heat exchange equipment with water flowing in the tube side, ≤1000; for stainless steel heat exchange equipment with water flowing in the shell side, when the temperature of the water on the shell side is ≤70°C and the outlet temperature of the cooling water is less than 45°C, the value is ≤700
When titanium heat exchange tubes are used, there is no limitation on chloride ions
Normally, it should be less than 200, unless lower requirements apply for stainless steel
This post was last edited by drawng on 2009-9-23 10:43. According to relevant standards, clean water should be used for hydraulic testing; when testing austenitic stainless steel pipes or pipes connected to such pipes or equipment, the chloride content in the water must not exceed 25 ppm (200 mg/L).
Thank you all! Does anyone have detailed information?
1. It is necessary to understand the equipment itself. As mentioned on the second floor, the design specifications for shell-and-tube cooling water require a concentration of 1000 ppm on the tube side and 700 ppm on the shell side. However, if the equipment operates intermittently, concentrated stress corrosion and pitting will certainly occur. 2. Attention must be paid to the quality control of the cooling water; if the water is too turbid, has high scaling tendency, or contains excessive microbial sludge that leads to deposits and scaling within the equipment, localized concentration will occur, resulting in stress corrosion and pitting. 3. It is also important to consider the flow rate of water within the equipment – if the flow rate is too low, deposits will form, thereby causing corrosion!