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[PSUBS-MAILIST] Life support



I have a question about life support and internal cabin pressure. For long term life support in the the sub you put a CO2 scrubber in which transfers CO2 to Calcium Carbonate and add in pressurized oxygen. My question is when you add in pressurized oxygen how do you keep the cabin pressure to stay at 14.7 psi?
Thanks,
Scott Waters


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