If the incidences that occur and have caused death on CCR are also possible to occur on open circuit, WHY is the fractional incident rate appear to be much higher on ccr?
High PO2 When diving open circuit PO2 changes according to the decent / ascent rate or in some cases at a gas switch. It takes 2 things to affect PO: TIME and MOTION. Time to travel through the water column, changing ATA, thus effecting PO2 change. On open circuit, the diver is breathing a “stable” preset mix. On a ccr the diver is breathing a dynamic mix, in other words; a constantly changing mix, the FO2 constantly changes. Following we will examine how TIME and MOTION can work against the CCR diver and compound an existing problem. This makes it vital for the CCR diver to monitor PO2. In ccr diving excessive oxygen can be moved into the loop due to a component failure and PO2 change quickly without ANY change of depth. But to alleviate unfounded fears, the diver does indeed have sufficient time to correct the malfunction AND has successfully accomplished this task many times during the CCR course. Example: An open circuit diver at 100 fsw has an ATA of 4.03, if that diver descends 1
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