Quote: (Originally Posted by
Freef)
The problem is that the pO2 spike IS long lasting. Realistically, you won't hit 2.1 as there is still a proportion of 'used' gas in the loop [hoses and scrubber].
Hmm Warning: pulling some newbie theory out of my arse here:
A loop with PPO=2.1 contains the same amount of O2 at depth and shallow.A loop with PPO2.1 will breathe down faster at depth than a loop with 2.1 wich is shallower, asuming flow into loop is stopped, and all other things equal, since the relative fraction of N2 is bigger.
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So using constant mass-flow SCR at depth, means you'll have to increase the mass-flow and lower the Fo2 of the gas (Basic, huh). But can you still get significant savings over OC-trimix (say 5:1), however you can end up with a flow so large that you save nothing or even use more gas at the shallower parts of the dives, though you'll allso need some bigger tanks.
I see no limit depth for this type of SCR, but they end up being only usefull (economic) at the deep end of the pool, for single jet dives. To have significant saving at the shallower parts allso, you then need multiple dosage-devices, say one per FO2-mix, or something to scale the mass-flow with absolute pressure.... Wich leads to pSCR.
Nicolai