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  1. #1
    Join Date
    Jul 2005
    Location
    south
    Posts
    590

    Condenser descaling chemical ?

    Got a Carrier 30HX with a severely scaled condenser tubes(Heavy silica)
    Was told to use AMMONIUM BIFLUORIDE.

    Anybody have any experience with this chemical?
    How many lbs per gallons?

  2. #2
    Join Date
    Mar 2004
    Location
    ottawa canada
    Posts
    2,063
    Employ the services of a suitable company to do the descaling for you .
    The chemicals used for descaling are nasty evil s&%@, plus if you do it wrong you can do even more damage than there already is . If they do it wrong its not your fault .
    Show them the chiller tell em have at er and stand back and watch .
    The 64 roars to life Whoo hoo ...shes a rolling chassis .
    You bend em" I"ll mend em" !!!!!!!
    I"m not a service tech.. I"m a thermodynamic transfer analyst & strategic system sustainability specialist
    Best Austin Healey In Show twice in 2013 .....All those hrs paid off .

  3. #3
    Join Date
    May 2012
    Location
    California
    Posts
    237
    Rydlyme works great and you can put it down drain when your done.

  4. #4
    Join Date
    Jul 2005
    Location
    south
    Posts
    590
    I have descaled dozens of chillers so being around chemicals is nothing new.
    Due to neglected water treatment standard chemicals like rydlyme will not work. We contacted water treatment co. and was recommended the specific chemical listed above.

    Just curious if anybody has used it before.

  5. #5
    Join Date
    Jul 2009
    Location
    In a mechanical room....
    Posts
    1,888
    I like to ask our treatment guy about it but am I incorrect in thanking that TSP dissolved silica,
    “It takes courage to grow up and turn out to be who you really are.”

    - E.E. Cummings

  6. #6
    Join Date
    Feb 2012
    Location
    utah
    Posts
    106
    wow and I thought rydlym worked for everything. once had a cement truck driver dump his leftover in the cooling tower (never did get the explanation) anyway it filled two chillers. ran the rydlym and good to go, must be the lym in the cement.

  7. #7
    Join Date
    Jun 2010
    Location
    Miami
    Posts
    258
    Silica is tough. I would farm it out too. First time you eat up a condenser you will wish you had. Stuff happens....power fails and pumps burn up in the middle of the night when nobody is around to notice.

    But yes, the chemical you list is one of the ones you will need. There are others and I assume copper tubes. If so then you are looking at something that needs to be disposed of properly as it is a hazardous waste.

    Silica is tough enough that it could actually be cheaper to retube/replace condenser bundle.

  8. #8
    Join Date
    Jan 2009
    Location
    Not in Iran
    Posts
    1,093
    Quote Originally Posted by nique View Post
    wow and I thought rydlym worked for everything. once had a cement truck driver dump his leftover in the cooling tower (never did get the explanation) anyway it filled two chillers. ran the rydlym and good to go, must be the lym in the cement.


    WHAT !!!!!
    Cement truck did what, really?
    no signature blast'em man blast'em
    !!!KILL THE TERRORIST!!!

  9. #9
    Join Date
    Feb 2012
    Location
    utah
    Posts
    106
    Ya like I said I never did get the explanation but oh what a mess. It was a dang good thing all the screens were in place to stop all the gravel. It was kind of funny at first cause we had just brushed the tubes and all of the son the tubes are fouled. We obviously blamed the chemical guy. It wasn’t till we pulled the screens and found all the gravel that we started putting the pieces together. Good part is they got it on camera.

  10. #10
    Join Date
    Aug 2010
    Posts
    2,806
    ammonium bifluoride works by releasing HF, which dissolves glass and silicates. One of the most dangerous chemicals out there.

    HF is not your ordinary acid. That thing is crazy dangerous. It goes through your skin and if you get enough on you, it takes you out by systematic fluoride poisoning.

    If you're doing artistic glass etching on the table, its not a huge deal, but industrial cooling tower cleaning involves enough quantity of HF for this hazard.

  11. #11
    Join Date
    Jun 2012
    Location
    Delaware
    Posts
    14
    I've used scale dissolver from united. It changes color as you are flushing it so you know when it's done and neutralized. I think the ratio is 3 parts water 1 part dissolver. It comes with litmus paper as well.

  12. #12
    Join Date
    Aug 2010
    Posts
    2,806
    Scale dissolving is much the same, EXCEPT when it comes to silicates.
    They're usually a mix of organic acids like oxalic and citric.

    Highly concentrated phosphoric acid and caustic soda can dissolve silicate too, but they also aggressively attack aluminum, zinc and brass.

    Get the MSDS. If it says hydrogen fluoride/hydrofluoric acid or its derivative like ammonium bifluoride, I would avoid it and hire a specialist. That chit is extreme poison.

  13. #13
    Join Date
    Mar 2004
    Location
    Windsor ON Canada
    Posts
    404
    I service a refrigeration unit in a plant that makes HF acid. You absolutely do not want to come into contact with that stuff, If I could show you video of an HF acid burn, you would run, not walk away from the stuff.

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