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OK guys, new topic.
I was talking to some pulmonary people today and ran into a couple of
interesting topics.
First, liquid oxygen.  A tank of liquid O2, which wouldn't take up more
room than a pair of doubles, can carry something like 34,000 liters of
oxygen.  This is enough to supply 15l per minute for 7 hours.  Question,
does anyone know if this could be applied to practical use on a dive
boat- i.e.. emergency oxygen for deco symptoms, or use as a source of
oxygen for mixing on a multi day dive?
Second, there are "oxygen concentrators" that can be used to fill oxygen
bottles.  The machines can deliver about 95% pure O2, at 2000psi at a
rate that would fill a deco bottle in about 6 hours.  This might be
useful for just plugging in at home, filling you O2 tanks during the
week, and then going diving over the weekend.  The only down side I can
see is that the units use about 800watts per hour.  Not a huge amount of
electricity, but still not inconsequential.
Wendell G
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