richmonddiver
Contributor
I did some calculations in Excel to determine when the gas supply for an AL80 does not exceed the NDL for a given depth.
I calculate that the gas supply is the limiting factor until between 70-80 ft on air. The gas supply is the limiting factor until between 100-110 ft on EANx32. You gas supply is always the limiting factor on EANx36, but the partial pressure of oxygen exceeds 1.4 ata at around 95 ft.
The calculations use a RMV of 0.5 cuft/min. I don't know what most folk's RMVs are, but I don't get much lower than that. I used the PADI tables for the calculations, since everyone's computer can be a little different. Hopefully all of the calculations are correct, but I encourage everyone to confirm their veracity.
BTW: Does any one know why PADI limits dives to a maximum of 220 minutes no matter what the gas composition? I never noticed this before.
Here's the screenshot for air:
Here is a screenshot for EANx32
Here is a screenshot for EANx36
I calculate that the gas supply is the limiting factor until between 70-80 ft on air. The gas supply is the limiting factor until between 100-110 ft on EANx32. You gas supply is always the limiting factor on EANx36, but the partial pressure of oxygen exceeds 1.4 ata at around 95 ft.
The calculations use a RMV of 0.5 cuft/min. I don't know what most folk's RMVs are, but I don't get much lower than that. I used the PADI tables for the calculations, since everyone's computer can be a little different. Hopefully all of the calculations are correct, but I encourage everyone to confirm their veracity.
BTW: Does any one know why PADI limits dives to a maximum of 220 minutes no matter what the gas composition? I never noticed this before.
Here's the screenshot for air:
Here is a screenshot for EANx32
Here is a screenshot for EANx36