Rebreather World - View Single Post - Combined Primary Rebreather and Back up RB (BOB) dsv

Drmike · 19th November 2007, 12:43

Quote: (Originally Posted by diverreb)

Question for you guys using a BOB.....

Pre-breathing is necessary ( 2 -5 minutes on average) to get the Sorb/EAC's warmed up so that the proper scrubbing reactions can take place.

How does that happen with a BOB?

Assume you have an elevated breathing rate at the time of switch-over.... Does that present risks associated with higher CO2 levels?

Just curious.

Richie

my current protocal is to run semiclosed when 1st bail (and sometimes during whole bail) this will help with going to cold scrubber. prebreathe on surface then descend, check when reach max depth and/or at reg intervals.

bob to me is gas extender. I would never plan on going to bob direct from a co2 issue - thats best dealt with (co2) with oc bail gas (which is why i still carry some oc bail gas). once breathing rate has recovered go to bob. to me bob is for uise if primary floods.

19th November 2007, 12:43	#5 (permalink)
Drmike Custom Title Allowed! Current Rebreather/s: MK 15.X Ouroboros Other CCR Home Build Other Rebreather/s: Inspiration Classic Other CCR Home Build Join Date: Feb 2005 Posts: 3,163	Re: Combined Primary Rebreather and Back up RB (BOB) dsv Quote: (Originally Posted by diverreb) Question for you guys using a BOB..... Pre-breathing is necessary ( 2 -5 minutes on average) to get the Sorb/EAC's warmed up so that the proper scrubbing reactions can take place. How does that happen with a BOB? Assume you have an elevated breathing rate at the time of switch-over.... Does that present risks associated with higher CO2 levels? Just curious. Richie my current protocal is to run semiclosed when 1st bail (and sometimes during whole bail) this will help with going to cold scrubber. prebreathe on surface then descend, check when reach max depth and/or at reg intervals. bob to me is gas extender. I would never plan on going to bob direct from a co2 issue - thats best dealt with (co2) with oc bail gas (which is why i still carry some oc bail gas). once breathing rate has recovered go to bob. to me bob is for uise if primary floods. __________________ Cave diving is a sport Wreck diving is a sport Diving in general is a sport 'Rebreather diving' is not a sport its the delusional obsession with a highly dangerous and often inappropriate piece of equipment Last edited by Drmike : 19th November 2007 at 12:45.
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