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Thread: Tube sheets

  1. #1
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    Hmm Tube sheets

    How carried away do you get with tube sheet corrosion? I wonder if I'm over doing it? What kind of problems have you had?

  2. #2
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    I think you need to be more specific . Evap /Cond . Scrape and clean or leave alone paint ,epoxy sandblast etc etc ????????
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  3. #3
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    Feb 2010
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    I would suggest some form of protection, cathodic, sacrificial anodes, or epoxy for example. If using epoxy ensure no imperfections in coating and also allow time for coating to properly cure, or you will have dramas. I'm assuming you are referring to condenser vessel.

  4. #4
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    Quote Originally Posted by chiller-thriller View Post
    How carried away do you get with tube sheet corrosion? I wonder if I'm over doing it? What kind of problems have you had?
    I'm with graham - that's way past vague at best.

  5. #5
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    i do not think that this is too vague...that is the evaporator...but graham is right, what do you want to know?
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  6. #6
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    Apr 2004
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    Winnipeg,MB,Canada
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    cond tube sheets

    I'm wondering if and how you guys treat condenser tube sheets, do you sandblast, what repair products you prefer, what doesn't work?

  7. #7
    Join Date
    Feb 2010
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    Depends on the amount of tube sheet erosion you maybe talking about , im a firm believer in cathodic protection , however maintenance of this type of protection is quite high compared to the usual plant owner saying epoxy coat sheets, I have warranty.

    Water treatment contractors are on the ball these days , I suggest contacting them if water quality is an issue.

    If your looking at new chillers spend the money, and go stainless on sheets and waterboxes.

    Epoxy is fine from the factory, but in my opinion if it is an existing machine u will not be able to dry out enough for coating to proberly adhere.

    Employing a good water treatment contractor should make it easier.

  8. #8
    Join Date
    Feb 2010
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    81
    Depends on the amount of tube sheet erosion you maybe talking about , im a firm believer in cathodic protection , however maintenance of this type of protection is quite high compared to the usual plant owner saying epoxy coat sheets, I have warranty.

    Water treatment contractors are on the ball these days , I suggest contacting them if water quality is an issue.

    If your looking at new chillers spend the money, and go stainless on sheets and waterboxes.

    Epoxy is fine from the factory, but in my opinion if it is an existing machine u will not be able to dry out enough for coating to proberly adhere.

    Employing a good water treatment contractor should make it easier.

  9. #9
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    May 2001
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    Western Wa
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    Rover is correct on the coating idea.

    We had one a few years back where the tower was in a location where people could throw unmentionable things into it. We coated the tube sheet and found that iron reducing bacteria would keep on going under the coating, even with a rust converter like POR 15.


    You can never get the tubes and sheet dry enough and clean enough on anything but a brand new machine.

    We went to a stabilized bromine based biocide, which helped greatly, but it can't really get under the scabby bubbled up crap. When you break up those blisters, look to see if there's bright metal underneath. The bright metal would be an indication that the iron reducing bacteria is still going on under the scab.
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  10. #10
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    Apr 2004
    Location
    Winnipeg,MB,Canada
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    cond tube sheets

    We have a customer, with some RTHD's and RTHC's, they've purchased some APEX3 coating and sacrificial anodes from their water treatment provider, and want us to apply it/them. I've got the info from the manufacturers of the coating, sandblasting isn't really feasible, although, I wouldn't mind a reason to buy a portable system. I see some potential in offering this service, if its possible to do something that I would look forward to seeing it again, to other customers.

  11. #11
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    Oct 2006
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    Central Texas
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    To my knowledge, The last re-tube job I did the condenser tube sheets were coated, and so were the heads. I myself have never done it, but to my understanding they will need to be sand blasted, and then coated.
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  12. #12
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    Jan 2010
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    In a Pineapple Under the Sea
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    The last place I worked we subbed a company that specializes in epoxy coatings to do 2 old 900 ton Carriers . The only way to get proper adheasion is by sandblasting and they used a special abrasive. They encapsulated both tube sheets with plastic and just had the nozzle sticking in one end and the chiller room stayed clean. It was a pretty involved process as the tube sheets and heads were in poor shape and had a lot of deteioration. It was expensive but had a lifetime warranty, except if you chipped it.

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