Results 1 to 7 of 7

Thread: Interior scratches 7bbl Ferm

  1. #1
    Join Date
    Jul 2012
    Location
    Monrovia, California
    Posts
    12

    Interior scratches 7bbl Ferm

    Hi everyone,
    I just purchased a well-used 8bbl brewery (mostly complete) and in the process of cleaning up one of the fermenters I came across some fairly deep scratches in the underside of the top that I missed on my inspection.

    Short of sending the tank to an electropolishing house (at $1.60/LITER, thank you) does anyone have any suggestions for getting rid of these things?

    My partner is a physicist, so he is pushing for us to do it in house by turning the tank upside down to minimize electrolyte usage.

    As a former rigger, that scares me.

    Thanks

    Dave

  2. #2
    Join Date
    May 2012
    Location
    Livermore, CA
    Posts
    688
    Electropolish is overkill, you need an Ra of 32 to be considered food grade sanitary, which is all that our tanks need. Thats a 150 grit polishing. You can go higher, a 220 grit, which is considered the standard for biotech. To get the scratches out, start with a low grit and polish until the surface is even, then step up the grit and polish again until you get to your desired grit, or to 150 whichever you prefer. No need to electropolish.

  3. #3
    Join Date
    Oct 2013
    Location
    Kentucky
    Posts
    563
    What he said.

    10+ amp angle grinder and high quality flap discs.

  4. #4
    Join Date
    Aug 2010
    Location
    Enterprise, Oregon
    Posts
    2,031
    After grinding the scratches out, you'll need to passivate the tank. Contact your chemical supplier for recommended chems and technique.

    Hanging a tank upside-down worries me greatly. Carefully laying it on its side on cradles will make the polishing easier.
    Timm Turrentine

    Brewerywright,
    Terminal Gravity Brewing,
    Enterprise. Oregon.

  5. #5
    Join Date
    Jul 2012
    Location
    Monrovia, California
    Posts
    12
    Reaching the scratches will also be a challenge since it is a side-manway tank. I will have to get some sort of extension handle for a rotating tool of some sort.

  6. #6
    Join Date
    May 2012
    Location
    Livermore, CA
    Posts
    688
    You just lay 2x4 across the tank cone and then build a platform. You cant run an extension like that. You could also lay the tank on its side and then climb in.

  7. #7
    Join Date
    Jul 2012
    Location
    Monrovia, California
    Posts
    12
    Quote Originally Posted by jebzter View Post
    You just lay 2x4 across the tank cone and then build a platform. You cant run an extension like that. You could also lay the tank on its side and then climb in.
    Climb inside? Haven't you heard you should never trust a skinny brewer?

    Actually that is a good suggestion, I will just have to find a younger, thinner, employee or contractor.

Similar Threads

  1. Surface finish on interior of vessels
    By dieterneck in forum Equipment Q&A (Sponsored by Standard Kegs)
    Replies: 9
    Last Post: 04-22-2018, 11:48 AM
  2. Interior scratches 7bbl Ferm
    By DaveBBR in forum Equipment Q&A (Sponsored by Standard Kegs)
    Replies: 6
    Last Post: 10-30-2017, 03:01 PM
  3. FV interior stain
    By Mills in forum Equipment Q&A (Sponsored by Standard Kegs)
    Replies: 1
    Last Post: 04-11-2012, 10:22 AM
  4. buffing out the scratches
    By Ted R. in forum Used Tanks (Available for Sponsorship)
    Replies: 11
    Last Post: 11-29-2011, 07:34 AM
  5. Scratches in fermenter
    By BigMuddyBrewing in forum Equipment Q&A (Sponsored by Standard Kegs)
    Replies: 6
    Last Post: 05-06-2009, 09:52 PM

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •