Page 2 of 3 FirstFirst 123 LastLast
Results 14 to 26 of 29
  1. #14
    The system feeds a ton of little fan coil units.

  2. #15
    Join Date
    Aug 2009
    Location
    Prattville, Alabama
    Posts
    2,067
    I know of a large campus facility that keeps dye in their chilled water, so if water pools on the ground anywhere they know where it's from.

  3. #16
    The system serves a large number of little fan coil units.

  4. #17
    Join Date
    Jul 2007
    Location
    The Hot South
    Posts
    1,317
    I would isolate different buildings at a time and see if the meter stops.

  5. #18
    Join Date
    Dec 2011
    Posts
    107
    Did you check every condensate drain for excese water flow?

  6. #19
    Join Date
    Aug 2009
    Location
    Jurupa Valley, CA
    Posts
    1,781
    There are methods that can be used for finding underground leaks. Some more elaborate than others. If your leak rate is that steady, just isolating each section for a few hours might help to determing which branch is the culprit. As for locating WHERE the leak (or leaks) is, there are some new teqniques working their way around. We recently had a company out to find one of many relatively large leaks in out HHW system's burried piping. Our facilility sits on top of a pretty substantial aquifer, and as such, underground leaks never surface, they drain down - making it very hard to locatie. What they did worked well. They drained the section of pipe, and then injected Helium with a Hydrogen trace gas into the pipe. Then then traveler along the ground, sniffing for the hydrogen (probing into the ground with the sampler, and drilling small holes through the asphalt parking lot to identify the location. They found at least the first of likely many leaks rather quickly with this method. Not really sure what it costs though.

  7. #20
    Join Date
    May 2010
    Posts
    1,295
    ^ I wouldn't wanna know what something like that costed :P

  8. #21
    Join Date
    Jan 2009
    Location
    Keokuk, IA
    Posts
    5,520
    It's the same method they use to check for leaks on high pressure gas mains... lie kteh one that leveled a California subdivision a few years ago. Personally I don't want to be the guy that has to drill the small bor holes TOWARDS a HP gas main.

    I don't think it's terribly expensive. You have the gas detection equipment (probably same used for confined space entries and such), then a small diameter boring machine and after that you're just paying a standard hourly rate for the technician. Not cheap, but not terrible I don't think. Our local gas company did it themselves with their local service techs.

  9. #22
    Join Date
    Aug 2009
    Location
    Jurupa Valley, CA
    Posts
    1,781
    Depending on the soil, you shouldn't have to bore. That's the reason for using the hydrogen/helium mix. It will migrate up through even packed soil. The only 'boring' we had to do for ours was to punch through the asphalt.

  10. #23
    Join Date
    Mar 2012
    Location
    montreal/canada
    Posts
    81
    Check ur fan coils if condensate drains have a access of water maybe a fan coil is leaking start with what is easy to check then go to next

  11. #24
    Join Date
    Jul 2012
    Location
    Phoenix
    Posts
    29
    Would start with the fan coil units.

  12. #25
    Join Date
    Mar 2003
    Posts
    7,326
    any chance you got a leaky bundle and are evaporating that bleed through the tower?

  13. #26
    Join Date
    Jul 2012
    Location
    Western KY
    Posts
    1,221
    Quote Originally Posted by Shophound View Post
    If your chilled water makeup meter in the plant is showing 3 gpm going in non stop, something is leaking pretty well. Your water chemistry is also shot. You can't afford to let this go on unresolved.

    I would isolate the chilled water flow to each air handler one by one to see if that stops the meter spinning. If it does not, start searching the chilled water lines where you can see them, especially where they go into or out of the ground, or enter/exit a building from below ground.

    I agree. If you have a coil leaking it may all be going out your condensate drain which would explain why you can't find it. If possible isolate the wings you mentioned first and see if you can narrow it down to one wing then start on the AHUs or fan coils in that wing. Good luck.

Page 2 of 3 FirstFirst 123 LastLast

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •  
Comfortech Show Promo Image

Related Forums

Plumbing Talks | Contractor Magazine
Forums | Electrical Construction & Maintenance (EC&M) Magazine
Comfortech365 Virtual Event