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Old 11-13-2009, 12:31 PM
 
51 posts, read 179,566 times
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We are new to Knoxville, coming from Detroit, MI. Our home here has a sprinkler system with a blow out valve set that is above ground. Is there any secret to blowing out the sprinklers?

I did my own in Michigan, but the system was set up so you could drain the water out inside the house. This system looks like it is complicated.
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Old 11-13-2009, 03:53 PM
 
Location: Knoxville
4,705 posts, read 25,193,519 times
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I watched them winterize a house across the street from one I was inspecting the other day.
They were there a couple hours.
I'm not an expert, and have never done it myself, but it looked like they took the heads off and blew the lines until the water quit coming out. Like I said, it took a long time for them to do it.
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Old 11-15-2009, 10:55 PM
 
Location: Knoxville
1,155 posts, read 3,375,120 times
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Its not complicated, as you need to blow all water out of the lines, and most companies, will completely remove the valve or at least disconnect. The usual chargers are around $50. and if you would like several names, you can dm me, and be happy to give you several that I have used.
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Old 11-16-2009, 02:11 PM
 
Location: Inwood, WV
69 posts, read 267,421 times
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Just make sure whoever does it either drains out, or completely removes the backflow preventer as well. They are pricey and can crack if water is left in them. I used to work at an Irrigation Supply store in Knoxville, and we sold alot of backflow preventers ($300+ ten years ago) to homeowners who forgot about it and found a crack come springtime.
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Old 11-16-2009, 11:02 PM
 
9,803 posts, read 16,113,469 times
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Just curious---------how deep are water lines usually buried in the Knoxville area

( I know the OP is asking about sprinkler systems, but I thought this would be a good thread to ask my question )
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Old 11-18-2009, 10:23 AM
 
51 posts, read 179,566 times
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Default Thank you

Thanks for the thoughts. I will remove the backflow preventer and store it in the garage. How to you remove the water between the backflow preventer and the main shutoff valve?

Do I need to do that, or just let it freeze and expand out the open top fitting?
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Old 11-18-2009, 03:44 PM
 
Location: Inwood, WV
69 posts, read 267,421 times
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Most well designed systems will have a 90 with a drain plug in it, where the line from the supply turns up to meet with the backflow. If you just pull the plug so to speak, it will drain out. If you can't do that, I have heard of people pouring rubbing alcohol down the pipe to keep it from freezing. I am not sure if it works or not, but it makes sense that it would. It really is not necessary to do ewither however, because once you remove the backflow, that end of the pipe will be open, and any water that would freeze would simply makes it way out of the open end (path of least resistance) and not harm anything.
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