Oxygen use: is NOT depth dependant.
O2 is used as it is metabolized by the body in direct relationship to workload ONLY
Most rebreathers utilize a 20 cf (600 litre) bottle or greater capacity.
The average diver metabolizes about 1 litre per minute. If working moderately the diver may
metabolize 1.5 litres. If working hard, perhaps 2 litres.
600 litres / 1 lpm = 600 minutes / 60 minutes = 10 hours
600 litres / 1.5 lpm = 400 minutes / 60 minutes = 6.6 hours
600 litres / 2 lpm = 300 minutes / 60 = 5 hours
These calculations are NOT depth dependant!!
consider the cost of Oxygen: approximately .30 per cf
Up to 10 hours of diving nitrox costing $6.00 in O2 fill.
Diluent use:
One breath is contained in the counterlung. If you dive to 99 fw you should use the equivalent of 4
breaths of air during the dive + buoyancy inflation
using helium; since no gas is expired to the environment the only gas you use is inflation of the
counter lungs on descent.
Diving to 300 ft would require as little as the equivalent of 10 breaths, FOR THE ENTIRE DIVE!
O2 is used as it is metabolized by the body in direct relationship to workload ONLY
Most rebreathers utilize a 20 cf (600 litre) bottle or greater capacity.
The average diver metabolizes about 1 litre per minute. If working moderately the diver may
metabolize 1.5 litres. If working hard, perhaps 2 litres.
600 litres / 1 lpm = 600 minutes / 60 minutes = 10 hours
600 litres / 1.5 lpm = 400 minutes / 60 minutes = 6.6 hours
600 litres / 2 lpm = 300 minutes / 60 = 5 hours
These calculations are NOT depth dependant!!
consider the cost of Oxygen: approximately .30 per cf
Up to 10 hours of diving nitrox costing $6.00 in O2 fill.
Diluent use:
One breath is contained in the counterlung. If you dive to 99 fw you should use the equivalent of 4
breaths of air during the dive + buoyancy inflation
using helium; since no gas is expired to the environment the only gas you use is inflation of the
counter lungs on descent.
Diving to 300 ft would require as little as the equivalent of 10 breaths, FOR THE ENTIRE DIVE!
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