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Rick asked I am thinking of installing 2 copper pipes running from my basement?

One will carry hot water, another one cold. They will cut through the base board of the house, then run underneath the deck to the hottub. They will be used to fill the hottub. You ask, why don't you just use a garden hose? - Too much work. Especially in the winter. The house is in the mountains, and gets a lot of snow. The external faucet may freeze, and then I'd need to run the hose through the living room into the basement, i've done it once, had enough. Also, the house is a vacation rental, and if the hottub is a mess, i need to change it quickly. So here are my questions: 1. In the winter months, the temperatures drop below zero. If I turn on the cold water, it starts flowing through a very very cold brass pipe, will it turn to ice midway? 2. Do you know of any mechanical flow control shut off valves that can be set to deliver precise number of gallons, say 450, and then shut off. It would also be nice if it back drained the pipe into the sump after it shuts off!

And got the following answer:

If the pipe is not already frozen then the water flowing at full pressure through the cold pipe will not freeze. It is common to leave a faucet trickling to keep it from freezing in the winter, but if the trickle is too slow and the temperature is really cold then the valve can get blocked with small ice crystals, stop the trickle and freeze up. I have had a trickle freeze into a column of ice from the ground to the faucet until it finally blocked the flow and froze in the faucet. Look at how irrigation systems are piped and controlled for both winter protection and using metering shutoff valves. A site like this http://www.hunterindustries.com/Resources/Technical_Bulletins/winterization.html can provide some ideas on this. This site, http://www.lbsgardenwarehouse.co.uk/product.asp?pf_id=WMV01&recno=2&cid=MRS2ZSJ9E4DZFDG3TYFW04E69UISECZH, sells metering shut-off valves on which you dial in the amount of water you want delivered and then the valve automatically shuts off. This company has a model that operates up to 2,000 liters (528 gallons) and 10,000 liters or 2,642 gallons. Unfortunately this is in the UK and I can't seem to find one listed in the U.S. However, I would think that U.S. irrigation system suppliers would have some sort of flow metering and shut-off valve too. You could put automatic main line drains on each water line in the protected basement like you find on irrigation systems or vacuum breaker type drain valves on the pipes. Whenever the pressure drops below 5 psi the automatic drain valve opens and lets the water drain out of the line. You can also install a drain valve just after the shutoff valve in a pipe teed off of the main pipe run and open it manually when you want to drain the line. Run the pipes so there is a constant slope with the drain valve at the lowest point. Then when you turn off the water the drain valve will let all the water in the pipe drain into a bucket, a drain line or into a pipe that opens at a floor drain opening to clear the pipes and avoid freezing.

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