Posted for "F. Barry Knotts" <bknotts@earthlink.net>:
I only have one thought.  It you're high and the OAT is below freezing,
the baggage compartment might fall below freezing.  Then you have a risk
of freezing the O2 lines if there is any water vapor in the O2.  The
capillary line would probably be the most likely to ice up due to its
small size.  Medical oxygen is always supposed to be dry and since
aviation oxygen comes from the same tank, I suppose you would be
unlikely to freeze up your system.  But the aviation O2 I have had
serviced in my current aircraft has not always been perfectly dry.  By
the way, where is the control unit, in the cabin or in the baggage
compartment?  Any problem with it being cold?

A water trap and a way to drain it and a way to blow out the lines might
be a reasonable precaution in case you did get a bad O2 "batch."

Just some thoughts.

Barry Knotts
IV-P, planning a standard Continental TSIO-550, just starting.