Originally Posted by sandlapper
. A good test for burst pipes is to turn on the pump(with water in the fresh tank). If it pressurizes and shuts off you're ok. If it continues to run you likely have a problem. I'm bettin' you're OK.
Don't count on that pump cyle and stop test. When water pipes freeze, the water expands inside (10%) and increases the water pressure. So you check the pump, it cyles and stops. Or you even check a faucet, there's water pressure. But if you let it run another moment, it dies, because you have just bled off the increased pressure from the freezing water. It's good to have bled off the pressure some, but the pipes are still freezing with other zones with frozen in pressure. Now you only have minutes to get that zone thawed out before things burst, unless it is a material that will take 10% increase in size, and again for each time the water freezes.
Cold wind will find the unprotected section of the lines and cause a freeze where you wouldn't expect it. Aluminum is a very good conductor of cold.
The best way I've found to thaw pipes is a 2 liter bottle of hot water with a hole pierced in the lid, and maybe massage the pipe with a rag with the hot water. So far I haven't had the joy of thawing out pipes in the airstream, yet.
A trick from the snowmaking crew on the ski area, when they blow the water out of the snow making lines, they blow until there's no more fog coming out. I wouldn't use that much airpressure blowing out my lines in the airstream though.