Frosty night? Should I blow?

Discussion in 'Irrigation' started by slemon, Oct 20, 2011.

  1. slemon

    slemon LawnSite Member
    Messages: 57

    We will have couple of cold night in a few days with lowest temperature of 29 F. My backflow is in the basement and only exposed structures are heads. I overseeded and wanted to keep seedlings going.
  2. jvanvliet

    jvanvliet LawnSite Gold Member
    Messages: 3,944

    (Sing to the tune of "Blow the Man Down")

    At night it is freezing
    It's colder than hell

    Yo Ho Blow the lines out

    Old lines can get rusted
    And with frost get busted

    Nothing to do, but blow the lines out

    Not that I realy know Jack about it living in a sub-tropical climate; seems like common sense though :)
  3. greenmonster304

    greenmonster304 LawnSite Gold Member
    Messages: 3,690

    I think you will be fine if it is just dipping into freezing temps. It needs to be below freezing for a few days to get into the ground. But if you have any piping above ground you could have some trouble.
    Posted via Mobile Device
  4. unit28

    unit28 LawnSite Bronze Member
    Messages: 1,554

    cold in the morning...sailors warning

    are you using the backflow above ground on other systems?
    Just a guess but don't those poppets get brittle?

    SLam that valve open with the A.C. at 75psi and I bet it'll break a 1"
    assembly at around freezing temps.

    Messages: 18,668

    Not sure without knowing the ops location a decision can be made. seems late as well to be overseeding unless I guess one is in N. GA.
  6. slemon

    slemon LawnSite Member
    Messages: 57

    I am at Eastern Washington. I overseeded 6 weeks ago and got some good growth. Backflow is out of harms way in the basement. I forgot to mention I do have shrub risers open to air so I guess I better blow.

    Messages: 18,668

    Shrub risers don't have water in them unless they are all at the lowest point in your system. I always got a kick out of homeowners that put insulation on their shrub risers.
  8. slemon

    slemon LawnSite Member
    Messages: 57

    Where does water go if its 3' riser and I don't have drain valve? I saw water whenever I removed top of the buried sprinkler head

    Messages: 18,668

    It drains to the lowest head in the zone. If you have a zone that is all risers with no popups then I can see water remaining in the risers.
  10. Dirt Boy

    Dirt Boy LawnSite Senior Member
    Messages: 496

    Personally, I don't think you will have any problem unless, like others have said, it (temp) stays down there.
    The water will circulate a little right in the cold section (i.e. cold water will sink, warm water will rise) and the ground won't be 29 anyway, so it's going to keep them warm as well.
    Another option is just to set your controller to come on for a minute or two, during the night.

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