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martin1b
05-23-2007, 12:26 PM
I'm installing a sprinkler system and have a question. I'm running my main trunk to the valve boxes from a pitless adapter from my well casing. From the pitless, I go to a shut off valve > sediment filter > then up through the frost line and into the trunk which is 18" below ground (above our freeze line). I was hoping to put a valve box above the shut off valve and sediment filter and let it hollow so I can access it when winterizing. However, even though it's below freeze line, since the pipes are exposed (some partially and some fully), wouldn't that create a freezing issue, even though they're below the freeze line?

Bill
Wichita, KS

Verdeboy
05-23-2007, 12:43 PM
It's only a freezing issue if there's water left in there. Can you drain it or blow it out?

I think that if pipes are exposed to below-freezing air temp. it doesn't matter if they are below the frost line. They will freeze, but insulation can help.

martin1b
05-24-2007, 07:20 AM
Thanks for the info. I'm also little worried about my tee off of the casing. One side has a shut off which everything after that will be blown out. On the other side, it feeds the house. It will remain pressurized. All of this is below freeze line. I plan to cover this with a valve box and put insulation in the hole. However, the hole will be open for accessibility.

Is this a concern or am I making a mountain out of a mole hill?

Verdeboy
05-24-2007, 08:47 AM
If it's properly insulated, you should be fine. On super cold days, you can keep the water dripping in one of your indoor faucets just to make sure.