Quote: (Originally Posted by
Brainx3)
We all agree that there's no perfect unit. Trying to modify a unit to have more redundancy would require some design changes or ad-ons, and the diver will need good understanding and training in order to improve his/her ability to react according to the new design/mechanism.
my point is that it is possible to introduce much greater risk in one area when slightly reducing the risk in another. In my view, a double system creates a load of new problems to solve ones that don't really exist in practice.
If the solenoid is crap use a good one, if the CMF orifice blocks use a filter. if the batteries fail use better ones. Those are examples of solving problems - adding a whole new O2 system doesn't add safety just complexity.
I've seen people with so much gear they can't achieve even a simple dive, this train of thought heads down that route - what if both your O2 systems fail - do you need a 3rd? what about a 4th - you can't be too careful.
I'd rely on O/C bailout or if necessary take a completely redundant CCR.
John