billgraham
Contributor
It sounds really stupid, but anytime you hear a "blub", you'd better check it out straight away.
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Only time I have HAD to bailout to OC for real (i.e. not for training purposes, etc.) was a few years ago when I was demo diving a Liberty SM unit. The owner of the unit who was giving me the demo, and with me on the dive, had apparently already run 1 too many demos that day without having refilled the tiny onboard O2 supply. I'd say this was his fault, but let's just say it was my fault for trusting him and not checking myself before the dive. So what happened was we did a 20 or 30 minute dive to 40 or 50 feet depth, and as we ascended the PPO2 kept dropping even as I kept hitting the O2 MAV. When the PPO2 hit 0.17 and I still had not figured out what the problem was, I bailed out to OC. Since at this point we were at 10 feet, I could have just done a CESA at that point. If I had realized what the real issue was, I could have just done a dil flush to bring it back up to 0.21 or more, but since I was in doubt, I bailed out.I am curious as to who has had to bailout to open circuit and why?
My friend who teaches CCR frequently would say you should always hit the dil button in that situation rather than the O-2 add button, which I thought sounded counterintuitive at first but it makes sense when you think about it.Only time I have HAD to bailout to OC for real (i.e. not for training purposes, etc.) was a few years ago when I was demo diving a Liberty SM unit. The owner of the unit who was giving me the demo, and with me on the dive, had apparently already run 1 too many demos that day without having refilled the tiny onboard O2 supply. I'd say this was his fault, but let's just say it was my fault for trusting him and not checking myself before the dive. So what happened was we did a 20 or 30 minute dive to 40 or 50 feet depth, and as we ascended the PPO2 kept dropping even as I kept hitting the O2 MAV. When the PPO2 hit 0.17 and I still had not figured out what the problem was, I bailed out to OC. Since at this point we were at 10 feet, I could have just done a CESA at that point. If I had realized what the real issue was, I could have just done a dil flush to bring it back up to 0.21 or more, but since I was in doubt, I bailed out.
I would second that. At 30ft I have no problem doing an O2 flush when ascending since you're offgasing but if at first you don't succeed, try the dil button which will at least get you back to something in the 0.3-0.6 range....My friend who teaches CCR frequently would say you should always hit the dil button in that situation rather than the O-2 add button, which I thought sounded counterintuitive at first but it makes sense when you think about it.