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Old 02-05-2009, 05:01 PM
m249saw m249saw is offline
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Backflow preventer freezing and breaking

Hello all,

I have a Febco 1" back flow preventer and twice it has frozen over (a rare thing but quite common this year in Florida). Both times the bonnet and poppet have cracked (my guess due to being submerged in frozen water).

The first time I didn't have my irrigation valve off and it flowed for about 5-10 minutes before my neighbor noticed it and shut it off. This time my water is off and I found it in pieces on the ground.

My question, the obvious: how do I prevent this from happening? Siphon out all the remaining water in the preventer valve or somehow insulate the brass body?

Thanks all,
Kyle
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Old 02-05-2009, 05:05 PM
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DanaMac DanaMac is online now
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If you are in FLA., insulating should be sufficient. the problem arises because the water INSIDE the PVB freezes, and EXPANDS, and pushes up the bonnet and poppet.

Best solution is turn the water off and drain as much water out as you can. Maybe still insulate during cold times in Jan. and Feb.
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Old 02-05-2009, 05:18 PM
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Wet_Boots Wet_Boots is online now
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Other means of protection would involve running a tiny flow of water through the device, if you manage to make it happen BEFORE the freezing temperatures.
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Old 02-05-2009, 11:36 PM
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Waterit Waterit is offline
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Just cut that sucker out of there completely. As the TV ad used to say, this is Florida, the rules are different here.
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Old 02-06-2009, 08:48 PM
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Sprinkus Sprinkus is offline
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I typically install a freeze protection valve along with insulating the pipes.
Ummm, you mention that the device may be submerged in freezing water. Is it installed below grade?
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Old 02-06-2009, 08:51 PM
m249saw m249saw is offline
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I think I might just go with a cover for the 6-7 nights it actually goes below freezing. Thanks all!
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Old 02-07-2009, 09:18 AM
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If you plan to not use it for a few months , you can degut it.
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Old 02-07-2009, 09:24 AM
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Quote:
Originally Posted by AI Inc View Post
If you plan to not use it for a few months , you can degut it.
But then it must be re-tested!!
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Old 02-07-2009, 09:28 AM
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But then it must be re-tested!!
In fla, I thought down there inspectors are just so happy to see ya have one , they will go down on ya. no?
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Old 02-07-2009, 09:38 AM
m249saw m249saw is offline
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Quote:
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In fla, I thought down there inspectors are just so happy to see ya have one , they will go down on ya. no?
That might explain why my neighbor has 5 of them.
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