silent running
Contributor
got it..
Situation 1 - Diver coming up from a 300' dive. Bailed out to BOV at about 180', but then switched to other OC gases as we got shallower (deco gases/etc). His BOV was plumbed into a 3L cylinder so it wouldn't have lasted too long anyway (we had about an hour of deco).
Situation 2 - Diver on a cave dive. Bailed out on BOV and stayed on BOV for the 200' travel to the exit. For those of you familiar with the cave, he was at the Park Bench in Ginnie. His BOV was plumbed into off-board gas and he had all the gas in the world; it was literally the start of a cave dive and he CO2'd himself by swimming too hard in the flow.
BTW now that I'm thinking about it, there's two more events I can think of. Both involved debris in mushroom valves (duckweed). Both cases divers stayed on the BOV, both cases the BOV was plumbed into off-board gas.
Thanks for the detailed info, yes BOV should always be plumbed into BO gas, not small cylinder back gas. A lesson to anybody considering adding a BOV.
Duckweed in the mushroom valves, something that could only happen in a freshwater spring, never thought of that one. I’m generally in favor of staying on the loop once I splash but stuff happens. I guess a BOV can also help with surface swimming, even if you just switch to OC and let the loop dangle, at least you won’t flood the unit. Of course it depends on how well tuned the BOV 2nd stage is and whether it is prone free flow.
Out of curiosity, was the cave diver who over breathed into a CO2 hit using a cartridge scrubber?