"Edwin Pawlowski" wrote in message
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"jack" wrote in message
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So, why do some pipes burst, but not this one? The ice expanded out the
top,

There's your answer. Solder a valve on one end, fill, close valve, then
freeze
Sealing the top doesn't seem right. The one time I had broken pipes, they
were drained, but there was some residue left in low spots. They had plenty
of room to expand into.

I thought a better test would be to put a right angle bend on the pipe; then
fill it and let it freeze. The right angle would reduce the ice's ability
to expand, and would be pretty much like real plumbing.

4 hours at zero and it didn't do anything but freeze. It didn't even swell.

Apparently my simulation is deficient. Maybe the bottom of the L has to be
much longer?