Riser Freeze Protection

Discussion in 'Plumbing Forum, Professional & DIY Advice' started by kenbect, Feb 4, 2007.

  1. kenbect

    kenbect New Member

    Feb 4, 2007
    I have freeze proof yard hydrants in an RV Park application. Of course they are only freeze proof when they are turned off and the water drains out of the riser. During freezing weather I can keep the above-ground portion from freezing when an RV is hooked up to it by using heat tape and insulation. All heat tape I have seen is not for use under ground. How can I protect the portion of the riser that is below ground from freezing when there is frost in the ground and I have long term guests that need to stay hooked up to the water? They also use heat tape and insulation on their hoses so the only vulnerable spot is the underground portion of the riser. I am getting ready to add a new section of sites. Is there anything I can do to insulate the new hydrants when I install them?
  2. Randyj

    Randyj Master Plumber

    Nov 25, 2006
    I'm sitting down south so I'm not familiar with having to worry about freezing for long periods of time. However, one thing I do "because it's kewl" is to put faucets in a bucket in the ground then use a stepping stone for a cover. Of course, in a nice upscale area you might want to use something with a bit more "designer" appearance that provides the same function of being out of the way as well as being protected from freezing. Underground in a hole you can use the heat tape if there is no concern with flooding and you have it on a gfi circuit....merely my suggestion.
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  4. Gary Swart

    Gary Swart In the Trades

    Sep 1, 2004
    Yakima WA
    If the supply line is below frost level, you can put a stop n waste valve at the end of the supply line then a street el to the riser. Turn the stop m waste off to drain to the supply line. If the supply line is not below frost level, as far as I know, you're screwed.
  5. harleysilo

    harleysilo New Member

    May 26, 2006
    The idea to make the hydrant in an enclosed area seems logical. If you didn't like the bucket idea, using that pricipal you could use the round cardboard tubes used to pour concrete footings. You could dig an hole a few inches larger than the tube you use around the hydrant, pour a "floor" first, then come back insert tube and pour around it instead of in it. If it's below flood line so to speak there is an additive you can buy to mix with the concret to make it waterproof, i used it for an above ground fish pond, it works. And then you could do whatever you need to do to make a lid for it.
  6. Cass

    Cass Plumber

    Nov 12, 2005
    I have installed automatic horse watering systems from Nelson. They use a combination of 6" SDR pipe with insulation 4.5' deep and the benifit of trapped ground heat to prevent the piping from freezing. Then above the pipe is a small heater in the water the horse drinks from. I would bet you could use the insulation and 6" SDR and figure out the rest. Do a word search for Nelson Horse waterers and you should be able to get the info direct from them.
  7. leejosepho

    leejosepho DIY scratch-pad engineer

    Nov 23, 2006
    disabled-retired industrial fabricator
    200 miles south of Little Rock
    I had been wondering whether something like that might work, but my thought of possibly using small rocks for insulation inside a large pipe did not sound sufficient.

    Since the center of the earth is quite hot, the deeper the better, eh?! I have heard caves are consistently around 52 degrees f.
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