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  1. #1
    Join Date
    Jun 2008
    Posts
    62

    Oil in the CHW system

    We recently started doing work on some fan coils with CHW coils and HW coils. One of first things I see is oil dripping from drain line of AAV at one of the CHW coils. Go to clean strainers ( totally clogged) and find lots of oil in the Chw.This is on military base. Talk with Public works and sure enough one of the two 180 ton RTA chillers was replaced several years ago because of leaking evap. as well as other problems.
    We will be contacting water treatment companies with experience is this.
    Would like to hear anyones experience and ideas on clean up. Chilled water coils have two way valves and im assuming all or most of about 50 coils have clogged strainers at this point.

  2. #2
    Join Date
    Mar 2007
    Location
    Sterling Heights, MI
    Posts
    141
    Sounds like environmental cleanup company will have to suck out all the water/oil mixture. Big money. Dumping to drain is probably not a good idea, especially for a government job. Then chemical cleaning with TSP, and other chemicals which are allowed to circulate, rinse, and repeat maybe more than twice. This is not a quick job. Have to flush out all dead legs, coils, strainers, chillers, etc. just like new system startup. Lots of time and money. But are they really going to do it if they didn't do it before putting in the new chiller?
    Better Service Through Knowledge...
    RSES, The HVACR Training Authority. www.rses.org

  3. #3
    Join Date
    Mar 2007
    Location
    Sterling Heights, MI
    Posts
    141
    Sounds like environmental cleanup company will have to suck out all the water/oil mixture. Big money. Dumping to drain is probably not a good idea, especially for a government job. Then chemical cleaning with TSP, and other chemicals which are allowed to circulate, rinse, and repeat maybe more than twice. This is not a quick job. Have to flush out all dead legs, coils, strainers, chillers, etc. just like new system startup. Lots of time and money. But are they really going to do it if they didn't do it before putting in the new chiller?
    Better Service Through Knowledge...
    RSES, The HVACR Training Authority. www.rses.org

  4. #4
    Join Date
    Jun 2008
    Posts
    62
    It will have to be treated as hazardouz without question, and be pumped out. We dont know yet what our future participation will be . Ive already discussed with them that this along with a number of other things will take a full commitment on their part over a period of time. This building has been neglected for a long time.
    What is TCP. Anyone have experience with methods or products?
    Refernces for companies in Southern Cal.?

  5. #5
    Join Date
    Mar 2007
    Location
    Sterling Heights, MI
    Posts
    141
    Quote Originally Posted by temco View Post
    It will have to be treated as hazardouz without question, and be pumped out. We dont know yet what our future participation will be . Ive already discussed with them that this along with a number of other things will take a full commitment on their part over a period of time. This building has been neglected for a long time.
    What is TCP. Anyone have experience with methods or products?
    Refernces for companies in Southern Cal.?
    TSP is trisodiumphosphate, a detergent.

    Really, it's best to contact water treatment company, as you will be needing a drum, plus other chemicals, maybe antifoam.
    Better Service Through Knowledge...
    RSES, The HVACR Training Authority. www.rses.org

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