Oh, sorry, I meant 40bar/600psi.
1/12th and then 1/6th is actually 300psi - 600psi - 600psi ...
This is only twice as often as some other people do it. Frequent regulator switching is recommended in near freezing waters.
A minor detail: My regulator switching schedule is not accurately synchronized to thirds because my turnaround pressure is something like 2/3 + 200 psi due to rounding: I will round the pressure down to something easily divisible to avoid division errors. Then I divide that by three and subtract the result from the unrounded value. As a result I will use slightly less than 1/3 on entry. It's easier to calculate and it's slightly conservative. Win-win. Sometimes I dive quarters instead of thirds. So, having a regulator switching schedule that is independent of thirds works nicely for me. Further, I don't need to remember switching pressures or the fill pressures, I just look at delta P.
Using a longhose at the beginning of the dive is good practice. If your dive buddy serviced both regulators (or cylinders) at the same time, and something went wrong (I have seen this happen) then both/all regulators could fail at certain depth. Contaminated gas (carbon monoxide) could also lead to an out of gas situation that starts during descent.
1/12th and then 1/6th is actually 300psi - 600psi - 600psi ...
This is only twice as often as some other people do it. Frequent regulator switching is recommended in near freezing waters.
A minor detail: My regulator switching schedule is not accurately synchronized to thirds because my turnaround pressure is something like 2/3 + 200 psi due to rounding: I will round the pressure down to something easily divisible to avoid division errors. Then I divide that by three and subtract the result from the unrounded value. As a result I will use slightly less than 1/3 on entry. It's easier to calculate and it's slightly conservative. Win-win. Sometimes I dive quarters instead of thirds. So, having a regulator switching schedule that is independent of thirds works nicely for me. Further, I don't need to remember switching pressures or the fill pressures, I just look at delta P.
Using a longhose at the beginning of the dive is good practice. If your dive buddy serviced both regulators (or cylinders) at the same time, and something went wrong (I have seen this happen) then both/all regulators could fail at certain depth. Contaminated gas (carbon monoxide) could also lead to an out of gas situation that starts during descent.