You're right Craig,

They times when  i have  had probs with small propane bottles was
when using torch in cold weather. The steep pressure drop in that
situation made the torch valve freeze up.

That being said, when young and stupid, (as opposed to old and stupid
now), I was in N. BC and Alberta in my '69 beetle suffering from
frozen engine problems every morning (until I got a block heater).
One morning in Grande Prairie, clear and cold (-25C), I watched some
guys thaw out the engine in a dump truck using a tiger torch. Those
things really use the propane fast, I never thought about the propane
freezing in t reg then.

alistair

On 8-Nov-10, at 7:03 PM, craig cowan wrote:

I've run my stove in very cold conditions. I've never even though of the
propane lines freezing up. I don't think the gas is flowing through them
rapidly enough if you're just using the stove, fridge, or propex to
cause it
to chill down on its own due to expansion. I think if you had a leak,
then
yes. But I believe the propane has to REALLY flow fast to do that
much of a
cooling effect.
So, you'd only really be subjected to ambiant temperature of the air.

A propane torch would probably classify as that "moving alot of propane
REALLY fast" situation that would cause it's own cooling.