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  #1  
Old 10-20-2011, 11:15 PM
slemon slemon is offline
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Frosty night? Should I blow?

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.
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  #2  
Old 10-21-2011, 05:39 AM
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jvanvliet jvanvliet is offline
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(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
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Old 10-21-2011, 07:20 AM
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greenmonster304 greenmonster304 is online now
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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.
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Old 10-21-2011, 08:50 AM
unit28 unit28 is offline
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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.
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  #5  
Old 10-21-2011, 09:45 AM
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FIMCO-MEISTER FIMCO-MEISTER is offline
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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.
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  #6  
Old 10-21-2011, 11:13 AM
slemon slemon is offline
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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.
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  #7  
Old 10-21-2011, 11:18 AM
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FIMCO-MEISTER FIMCO-MEISTER is offline
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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.
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  #8  
Old 10-21-2011, 11:26 AM
slemon slemon is offline
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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
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  #9  
Old 10-21-2011, 12:00 PM
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FIMCO-MEISTER FIMCO-MEISTER is offline
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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.
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  #10  
Old 10-21-2011, 12:08 PM
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Dirt Boy Dirt Boy is offline
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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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