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The BIBS mask
increases the effectiveness of the O2 by delivering 100% O2
to the patient and results in a lower O2 concentration in the
chamber (most BIBS exhaust into the chamber) and a smaller stored volume of O2
for treatment. The chamber still needs to be “blown down” periodically to
lower the O2 and CO2 concentrations in the chamber. Special
paint and materials must be used in the chamber to avoid flash O2 fires.
Oxygen can be very dangerous at concentrations and pressures above ambient.
Have read accounts of an Air Force chamber accident where the high O2
levels allowed the test subject’s skin to catch fire after a lighting fixture
ruptured and sparked. Even at low pressure and high concentrations, O2
is still dangerous. An AF pilot used Chapstick to moisten his lips prior to a
flight that would require him to wear his oxygen mask. Somehow the greasy
Chapstick caught fire in the high O2 concentration and his mouth and
lungs were severely burned (don’t know if he survived). R/J2 Respectfully, Jay K. Jeffries Andros Is., It is the mark of an educated mind to be able to
entertain a thought without accepting it. From: Of course. The sat guys get their O2 through BIBS masks, however, so
you don't have a chamber full of oxygen and can control absolutely their
intake. You're dead on about flammables, too. Vance The capability
to deco at 66 ft. (3 atmos.) with pure O2 in a decompression chamber
is much more desirable. This is typically what you will find in a
hospital. Care has to taken in what materials are used in the building
and preservation of the chamber. For all this trouble, it is easier to
jump back in with a full face mask from a boat as Vance notes. If you
look at deco calcs you will find tat the O2 will accelerate the deco
process plus there is the added benefit of the “oxygen window” that further speeds
deco. If there is an incident, the pure O2 is more effective
in assisting with minimizing secondary injury around the “hit” from blocked
blood flow. R/J2 Respectfully, Jay K. Jeffries Andros Is., It is the mark of an educated mind to be able to
entertain a thought without accepting it. From: Brent, Yup, got it now. I don't know why you'd want a 2
atm DLO. It's a Vance Check out the new AOL.
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