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Discussion Forums - The Hendrix Group
HomeHomeDiscussionsDiscussionsMaterial Select...Material Select...Corrosion of 316L SS by mains water with 5ppm NaOClCorrosion of 316L SS by mains water with 5ppm NaOCl
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3/16/2005 9:00 AM
 
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Hi, I am designing a purified water system which will require chlorination by NaOCl to a controlled value of 1ppm in a stainless steel break tank. This will then be reduced by sodium bisulphate just prior to RO membranes, but I have a concern with the suitability of water in 316L with a free chlorine content up to 5 ppm particularly at temperature, up to 80 deg Celsius. At what temperature is chlorine gas corrosive to 316L stainless steel and is it the resulting HCl or the chlorine gas that can potentially do the damage. Is this concentration high enough to be of concern? If so, what concentration is acceptable for 316L in water at 80 deg C. Thank you in advance. Darren.
 
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3/23/2005 9:00 AM
 
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Darren: Without being specific on what ppm levels of residual chlorine that can be tolerated by 316SS (because its ill advised to do in the context of a discussion forum), we have concerns with pitting corrosion of 316SS at 5 ppm residual chlorine at 80C over an extended time period. The dissolved chlorine essentially combines with water to form a dilute HCL solution. Hope this helps! David Hendrix The Hendrix Group Inc.
 
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HomeHomeDiscussionsDiscussionsMaterial Select...Material Select...Corrosion of 316L SS by mains water with 5ppm NaOClCorrosion of 316L SS by mains water with 5ppm NaOCl


  

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