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Because you don't know its flooding caustic until it gets to the mouthpiece.
Chest Mounted Rebreather, Hose Routing, and Regulator Fitting Sides...
- Thread starter addohm
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justinthedeeps
Contributor
I'm curious to hear more about these situations leading up to cases where people were breathing/drinking/tasting sorb thru the mouthpiece.
Was it sudden floods, like catastrophic equipment issue? Or a gradual flood combined with changes in position?
How sudden was it? What was the underlying cause? When were the first warning signs? Could they have bailed out sooner? Where did the leak occur? What was the trim position?
The guy in that recent video who kind of ignored it for ~15 minutes--right into the head no less--didn't get caustic?
For me it was (ironically) a leak into the exhale side caused by a damaged BOV/DSV o-ring, the effects of which were noticeable for almost two hours, including gurgling and mildly increased breathing resistance. But all the water stayed in the bottom of the can, by design.
A downward position might possibly have soaked the can. Would reflexive breathing mean I then involuntarily suck all the way up thru the canister? Or would I correctly respond to that "can't breathe" feeling by turning the BOV instead? It could be a matter of practice and experience.
Also have received mouthfulls of presumably condensation from the inhale side on a rEvo after a long dive, but it wasn't caustic at all--by design? or am I just lucky?
Someone diving an inherently less 'flood tolerant' unit, in weird downward positions, with heavy task loading in constricted environments might indeed be more at risk. Sounds like advanced cave diving where of course you would want that necklace reg (and a BOV?)
He was occupied with trying to save his friend that toxed and died.
mr_v
Contributor
@justinthedeeps - as you've mentioned rEvo...
I too get condensation from the inhale side and will periodically move the condensation to the exhale side. It gets annoying but never to the point where I am concerned about flooding. The same happens on a Meg, but I can clean out the exhale lung.
Caustic happened on a rEvo only once during training. I forgot to close the DSV during a drill at the end of the dive, got some water into the exhale lung and did not think/feel that the flood was serious. Barrel rolled as a part of the last drill and got the caustic. I was fortunate not to gulp all of that water but still could not eat hot (temperature and spicy) food for about 2 weeks.
I use a necklaced reg for primary BO for multiple reasons, including having a reg that will always be free of caustic.
I too get condensation from the inhale side and will periodically move the condensation to the exhale side. It gets annoying but never to the point where I am concerned about flooding. The same happens on a Meg, but I can clean out the exhale lung.
Caustic happened on a rEvo only once during training. I forgot to close the DSV during a drill at the end of the dive, got some water into the exhale lung and did not think/feel that the flood was serious. Barrel rolled as a part of the last drill and got the caustic. I was fortunate not to gulp all of that water but still could not eat hot (temperature and spicy) food for about 2 weeks.
I use a necklaced reg for primary BO for multiple reasons, including having a reg that will always be free of caustic.
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