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#1 sarafc

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Posted 08 October 2019 - 01:51 AM

I was looking for some information regarding different types of stainless steel water system disinfection. I am aware that the most common is to use 30-50ppm of free chlorine for 1h however we have some concerns regarding the SS pipe and seals. Has anyone else have experience with any other chemicals other than sodium hypochlorite? 

 

Thanks.



#2 Raghav

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Posted 08 October 2019 - 05:04 AM

Caustic rinse



#3 LDG_Honey

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Posted 08 October 2019 - 06:23 PM

I'd wager that many product designed for CIP would do the job.

 

Sodium Hydroxide as a caustic or an acid like phosphoric acid come to mind.



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#4 Ryan M.

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Posted 08 October 2019 - 07:26 PM

There is a difference between a "cleaner" and a "disinfectant".  Caustic based chemicals are generally considered cleaners meaning they remove soils from the surface.  They are not considered disinfectants.  On the acids front, it depends on the type of acid and the concentration.  Some acid based chemicals can be disinfectants.

 

I understand your concern with the chlorine and stainless as chlorine can pit stainless steel.  However, low levels of chlorine as a one time or periodic disinfectant in your water system will not be an issue.  Chlorine pitting stainless typically happens when it is used regularly at higher concentrations, like supplemental cleaners during cleaning of equipment.  For example, in our facility our main cleaner contains chlorine around 150 to 300 PPM and we circulate it at temperature, about 150 degrees, for 15 minutes to an hour on stainless steel equipment.  We do not see pitting in our equipment from it.  Now, if the chlorine was sitting on the surface for a length period of time, then you start running into pitting problems.

 

I would recommend you consult your chemical supplier and get their recommendations.  



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#5 sarafc

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Posted 16 October 2019 - 01:52 AM

We have contacted Ecolab who suggested basically a CIP process to clean and disinfect the line:

- Drain line fully

- Flush with sodium hydroxide solution to clean

- Drain Fully

- Flush with clean water

- Flush with PAA base sanitiser 

- Drain Fully

- Flush with clean water

It worked well but it is a very long process to cover all water point in big facilities.  



#6 Charles.C

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Posted 16 October 2019 - 04:57 AM

We have contacted Ecolab who suggested basically a CIP process to clean and disinfect the line:

- Drain line fully

- Flush with sodium hydroxide solution to clean

- Drain Fully

- Flush with clean water

- Flush with PAA base sanitiser 

- Drain Fully

- Flush with clean water

It worked well but it is a very long process to cover all water point in big facilities.  

 

And regarding seals ??


Kind Regards,

 

Charles.C





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