[quote author=Dyngoe link=topic=5247.msg64928#msg64928 date=1227034465]
OK, 22ft of piping is a little different than 2ft. I still think there is little concern of your pipes bursting. All do respect Gresham
but half a dozen burst pipes in an area with 7+ million residents is rare to say the least. Even 60,000 burst pipes is just one percent of all residents in the Bay Area let alone all the possible pipes in all of the houses here. Personally I have never had a problem heating my tanks but cooling is a different issue all together. In CO, NJ and PA where it gets WAY below freezing we only had to worry about exposed pipes that had still water. Just running your water at a slow drip would stop most from freezing. Let's do some quick math:
Let's say your pipes are 2" diameter and you are running 900GPH through them. (I'll assume your pipes are actually smaller and your volume is actually higher so this is a conservative estimate.)
That means you hold a total of 22G in each pipe which flows through at 40X per hour. Or every 1.5 minutes there is "new" water in your pipes. It would take EXTREME cold to take water at ~77 deg to 32 degrees in that short amount of time. Even with the amount of surface area exposed to the cold it would be hard to freeze that line. We don't have that here. So, I go back to my original contention: take this as free cooling. If you are worried, check the temp at the entry and exit points early in the morning (usually it is coldest around 3-4AM but not much warmer by 6). If you don't see a significant decrease then nothing to worry about.
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Did you happen to see the last part of my post?
You do not have to worry about moving water and pipes bursting though.
I wasn't debating if his would burst, just the issue of pipes bursting due to freezing locally.
Freezing is a large enough issue that nearly every city and country in the area pays millions to protect their back flows and irrigation. It is an issue. It only takes one blown back flow to cause major damage. It only takes on pipe in your house to burst to cause damage
It doesn't matter about how many people live in the area either, it's not about statistics :lol: Why do you think people actually are in business in the area to protect pipes from such damage and why we have warnings on the new when an event is supposed to occur? It's not the same level of concern as say CO/NV/etc as it happens FAR less, but it does happen.