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  • 1.  Stainless Steel Tank Discoloration - Chemical options to remove?

    This message was posted by a user wishing to remain anonymous
    Posted 10-21-2024 11:43
    This message was posted by a user wishing to remain anonymous

    Good morning all, I am writing to ask your opinion on whether this kind of Tank soiling can be removed with CIP? (photos are attached) 

    What product would you recommend? 



  • 2.  RE: Stainless Steel Tank Discoloration - Chemical options to remove?

    Posted 10-22-2024 16:51

    We have had good success removing this kind of staining using a hydrochloric acid-based product.  Here is a blog I wrote on how to do it with before and after pictures:

    https://www.birkocorp.com/resources/blog/hot-liquor-tank-cleaning-using-birkos-ac-tec-100/

    Hope this helps.

    Dana



    ------------------------------
    Dana Johnson He/Him
    Sector Specialist, Craft Brewing
    Diversey - A Solenis Company
    Henderson, CO
    800.233.1000
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    Original Message


  • 3.  RE: Stainless Steel Tank Discoloration - Chemical options to remove?

    Posted 10-22-2024 16:51

    Hello,

       I think I replied in the wrong area before so not sure if you'll see it….

    id run a caustic cycle with a hydrogen peroxide booster added.  If you don't have those in house hit up your current chemical provider and they can get you set up.  Be diligent with temps and concentrations and it should take it right off.



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    Jason Brenden
    Head Brewer/Director of Operations
    Bridger Brewing
    Bozeman MT
    (218) 256-1132
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    Original Message


  • 4.  RE: Stainless Steel Tank Discoloration - Chemical options to remove?

    Posted 10-23-2024 17:00

    Looking at the pictures I am leaning towards biofilm deposits as well as a desperate cry for passivation, especially in the cold liquor tank.  I would recommend running a strong caustic with a peroxide additive first, followed by an inspection.  If the biofilm has been removed, you will likely still see some staining, which is rust from a lack of passivation.  This can be easily addressed with a strong Nitric Acid passivation cycle.

    I would stay away from Hydrochloric Acid products, even when inhibited, since there is no need for this type of treatment here.  I have seen much worse than this and while it looks intimidating, it is actually relatively easy to address. 

    You can e-mail me direct for Information about chemicals and exact procedures.

    Cheers,     



    ------------------------------
    Dirk Loeffler
    Executive Vice President
    SEKA Chemicals
    (404) 239-2700
    loeffler.dirk@sekachemicals.com
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    Original Message


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