Quote: (Originally Posted by
rjack)
If you subscribe to the concept that the right reg is more likely to fail than a post, it makes more sense.
Whether anyone has any hard data to support regs failing more than posts, I doubt.
Richard
But if your gas-plan is ok (it should be as you´re DIR), you´d never need more than half your backgas to get out anyway...the "extra" gas you may save by closing the "right" valve first has no real survival value to you, while losing more than half could potentially get you killed...
Let´s say you dive 1/3s (the least conservative) and something happens just as you turn the dive. You can either:
1. Close your isolation valve, have a worst case scenario of ½ your BG left (=1/3) which is still enough for you to get yourself out.
or
2. Close whichever post you´re guessing has the problem, have a worst case scenario where you´re basically OOG.
Am I missing something?