Checklists in Rebreather Diving
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Why should a ccr diver try the valves up? Or does that mean you have to try a Poseidon ccr because there are the valves up and the unit tells you what checks you have to do. So it is a monkeyproof ccr.
I dive with valves down on my inspiration, I own some 4 liters, no problems. Also short 3 liters are fine. If needed, I can put on 7 liters with valves down, but never tried. There is till now no need to have bigger cylinders than 3 liters, but I do own some 4 liters because of filling logistics. 7 liters will make it all too heavy. If I go down to 130 m, I still have 90-100 bars diluent left after a dive when I use a 3 liter cylinder. So why do you need a 7 liter diluent then? My bo's are ali80's. For me it is easier to carry cylinder by cylinder to the water than taking an heavy twin18 or a heavy ccr. That is why I went over to ccr, it was lighter than a twin12. A twin12 is the max I want to carry on my back.
But maybe I am stupid, but for a checklist, the valve up or down does not matter. You have to do the same checks, some are unit specific. And remember, if it is only valves up or down, then you can also buy a Poseidon or a Pelagian, units that already have their cylindervalves up a long time before someone modified a JJ. I am not against the DIR-JJ, but to say that it is only because valves are up, then there are other units that do the same and don't need to be modified. Also the gassharing principle can be learned in different ways where I don't see a best.
I don't think there is a best or worst with this.
I have tried several units, even a Poseidon. All have their weak points, but I can dive with all of them.
And a ccr is a ccr, the principle for all units is the same: filter CO2 out of the loop, add oxygen when needed (manually or electronic), deco is deco, etc. A leak is a leak. And like some people like brand X for a car, some others want brand Y. With ccr the same, some like a JJ, others like the Inspiration or Poseidon. At the end all units are divable. And if you are lazy with checks, all can be dangerous.
I dive with valves down on my inspiration, I own some 4 liters, no problems. Also short 3 liters are fine. If needed, I can put on 7 liters with valves down, but never tried. There is till now no need to have bigger cylinders than 3 liters, but I do own some 4 liters because of filling logistics. 7 liters will make it all too heavy. If I go down to 130 m, I still have 90-100 bars diluent left after a dive when I use a 3 liter cylinder. So why do you need a 7 liter diluent then? My bo's are ali80's. For me it is easier to carry cylinder by cylinder to the water than taking an heavy twin18 or a heavy ccr. That is why I went over to ccr, it was lighter than a twin12. A twin12 is the max I want to carry on my back.
But maybe I am stupid, but for a checklist, the valve up or down does not matter. You have to do the same checks, some are unit specific. And remember, if it is only valves up or down, then you can also buy a Poseidon or a Pelagian, units that already have their cylindervalves up a long time before someone modified a JJ. I am not against the DIR-JJ, but to say that it is only because valves are up, then there are other units that do the same and don't need to be modified. Also the gassharing principle can be learned in different ways where I don't see a best.
I don't think there is a best or worst with this.
I have tried several units, even a Poseidon. All have their weak points, but I can dive with all of them.
And a ccr is a ccr, the principle for all units is the same: filter CO2 out of the loop, add oxygen when needed (manually or electronic), deco is deco, etc. A leak is a leak. And like some people like brand X for a car, some others want brand Y. With ccr the same, some like a JJ, others like the Inspiration or Poseidon. At the end all units are divable. And if you are lazy with checks, all can be dangerous.
OP
solside1971
Registered
211ratsbud
Contributor
I don't have anything useful to report here.
Get your popcorn.
I don't use a formal check list.
Get your popcorn.
I don't use a formal check list.
I like build checklists. They keep me on track in the event I get distracted. They don't need to be that involved, but should be unit specific.
I like pre-dive jump checklists. They don't need to be that involved either (valves on, computers/HUD on, gases set, stack time remaining, bailout on and functional, MAV's working - DIL to bring PO2 down then O2 to bring back up, inflators working, check gauges to make sure everything was really on when you were pressing buttons).
I like pre-dive jump checklists. They don't need to be that involved either (valves on, computers/HUD on, gases set, stack time remaining, bailout on and functional, MAV's working - DIL to bring PO2 down then O2 to bring back up, inflators working, check gauges to make sure everything was really on when you were pressing buttons).
Underwater Tourist
Contributor
"In a human endeavour [surgery] that selects for the brightest people, and subjects them to most rigorous training of any profession, the introduction of an incandescently simple checklist resulted into ... a 50% decrease in mortality rate, and 30% decrease in complications"
Ignoring those kind of results is just stupid.
Ignoring those kind of results is just stupid.
Welcome to Scubaboard.
People cry for more accident reports and when they get them, ignore the obvious lessons...
211ratsbud
Contributor
I'm interested if written lists are the only acceptable way?
If you are thinking of a bat signal, that only works at night.
In all seriousness, what are alternatives to written lists?
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