I don’t have a SPG of any sort on my O2 bottle, used to have a button SPG, but I don’t like the reliability of those things, took it off and procedure is the same, check pressure on assembly/predive, I just have to check it with a pressure checker or a different reg, a small inconvenience. Once in the water I don’t need to check it, consumption is based on metabolic rate and is depth independent, I’d have to over exert myself significantly to make a difference in that consumption, if that were to happen, other issues would arise before O2 reserves becomes the problem.
I use a 3L bottle and the O2 usage is so “little” I even stoped plugging in my O2 BO bottle on dives resulting in ~1 hour of deco, even with the O2 flushes off of the 3L, I’d still end up with about a half full bottle.
There’s only one hose attached to O2 reg(with an OPV) and it sits right by my head, hose goes over my shoulder to MAV on chest Dring, everything is close by, I think I’ll catch a leak, specially one of any significance, not to mention I’d still have SCR option as well as full bailout in case of total O2 loss.
Uh, what? How on earth is that accepted as 'standard'? Put a SPG on it or a transmitter. I have a transmitter on my O2 and my 2 sidemount bottles (little overkill but I still like seeing my pressures easily, we had a local cave diver die b/c his reg was free flowing while DPVing and didn't notice until it was to late). I can see the pressures on both my Perdix and Petrel and I still monitor the gas in them during the dive.
Personally yes, I still use rule of 1/3's for all consumables as I was taught (scrubber/o2), however that is apparently a bit of contention here on SB as not all agencies follow this and scrubber duration for the sidewinder is highly dependent on the diver and conditions so there's no 'set duration' for everyone or even every dive. As I was taught in my Cave CCR class you basically should build up experience and not just start doing max penetrations right out of the gate, build up knowledge and determine what you limits are in various conditions. I do a BO gas calculation for my OC gas to make sure I have enough to exit from the deepest penetration + extra in the event of hypercapnia.
Was the reg attached to his O2 bottle? Probably not, so I think the free flow was from one of the dilout bottle? I know accidents are rarely one thing and rather a cascade of events, so here in this case I’m assuming the same, because otherwise we have at least one other BO bottle full and a fully functioning CCR?
