Chest Mounted Rebreather, Hose Routing, and Regulator Fitting Sides...

[rjack321]

How did the caustic get through? Must have been just before he closed the loop?

Because you don't know its flooding caustic until it gets to the mouthpiece.

 

[justinthedeeps]

Because you don't know its flooding caustic until it gets to the mouthpiece.

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?)

 

[kensuf]

How did the caustic get through? Must have been just before he closed the loop?

He was occupied with trying to save his friend that toxed and died.

 

[mr_v]

@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.

 

[justinthedeeps]

Ok suppose we want a BOV plus a necklace reg, but we also want quicker setup, and be able to superman, drop or exchange cylinders. Are there reasons not to run them both to the same inline splitter/manifold on a QC6 quick-disconnect on the diver side?

[Apart from forgetting to connect or test-breathe them on the S-drills, that is....]

 

[mr_v]

Ok suppose we want a BOV plus a necklace reg, but we also want quicker setup, and be able to superman, drop or exchange cylinders. Are there reasons not to run them both to the same inline splitter/manifold on a QC6 quick-disconnect on the diver side?

[Apart from forgetting to connect or test-breathe them on the S-drills, that is....]

If you run a BOV and a necklaced reg, it will be too crowded. Try it. Also, I haven't heard anyone bragging about BOV work of breathing. Poseidon's BOV may be different, as I've read rave reviews, but if I am coming up from 300', I'd rather have a reg that breathes well.

 

[grantctobin]

If you run a BOV and a necklaced reg, it will be too crowded. Try it.

Eh. Super fine enough with a Shrimp and an S600. Have gone back and forth using both and using only the BOV and vary it depending on what I’m doing.

 

[inquis]

Also, I haven't heard anyone bragging about BOV work of breathing

The latest Shrimp BOV is fine in my experience. I achieved my personal best SAC (by a huge margin) on the BO exit during a recent Cave CCR class.

 

[rjack321]

Ok suppose we want a BOV plus a necklace reg, but we also want quicker setup, and be able to superman, drop or exchange cylinders. Are there reasons not to run them both to the same inline splitter/manifold on a QC6 quick-disconnect on the diver side?

[Apart from forgetting to connect or test-breathe them on the S-drills, that is....]

Most people feed the BOV off a QC6 and the normal 2nd stage is on a conventional hose. Whether they stow the second stage or necklace it. There is zero need to put a QC6 on or in the 2nd stage flow path since you can just take it off (over your head) and stow it on a tank bungie to remove the BO tank.

Personally my BOV is on a QC6 and my 2nd stage is stuffed on a 7ft hose- a very OC sidemount vibe. At the time of my Meg course 10 yrs ago Leon was big on having donatable BO gas

 

[justinthedeeps]

Is everyone's necklace reg a quick pull-away type?

Most of us already have standard necklace reg setup and drills ingrained in us from OC training, but I think I'd rather unplug/replug a single QC6 than pull a bungee loop back up over my head, past the loop and over the mask etc (not to mention mouthpiece retaining straps ), four or more times (during setup, tank donate, tank receive, post-dive). But there would be risks of forgetting to replug etc

Donate reg yes mandatory for buddies, tho in OP's case sounds like it's on the right side cylinder