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Regarding redundancy and failure modes (since I've spent some time thinking
and inquiring about various forms...)

The probability of a of a total, sudden complete loss of air appears to be
limited to diver error (not watching SPG) or an SPG failure/non-calibration.
Regulator failures (primary and secondary) are generally fail-safe, with the
total loss of air miniscule.  It boils down to how much gas remains for a
controlled escape.  How would you rank:
   * Second stage failure (free-flow or hose rupture),
   * Power inflator valve failure (free-flow),
   * First stage failure (free-flow or freeze),
   * High-pressure hose failure,
   * Tank O-ring failure (at the regulator fitting),
   * Tank valve O-ring failure (in the tank neck)
in terms of "time to exhausting available air" ?

I doubt the previously mentioned "ballistic projectile" scenario of a tank
valve O-ring resulting in the valve blowing out; rather I would expect a
similar scenario to the yoke O-ring failing, but at a higher flow rate.

[\] Jeff Kell, jeff@ut*.ut*.ed*

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