Question Bailout gas configs for tech/deep chestmount rebreathers

[mr_v]

I see a lot of strait up stupid CCR gas planning. Primary gas aside, why is everyone in cave country afraid to take an 80 of O2. I see CCR divers planning an hour of deco with just a 40 for bailout, and probably not even a full one.

I am not sure that statement is accurate. But it is certainly subjective. What dive plans did you have in mind?

 

[lostsheep]

…

 

[Rayk]

Have you ever considered that your instructor may not be correct or know everything? Just a thought.

Of course I do, however when I have read some of the “practices”, I realized he did very well.

 

[rjack321]

I see a lot of strait up stupid CCR gas planning. Primary gas aside, why is everyone in cave country afraid to take an 80 of O2. I see CCR divers planning an hour of deco with just a 40 for bailout, and probably not even a full one.

Many of us can do 75minutes+ on a 40 of O2 especially when a 10ft stop is easy? what's the problem?

 

[J-Vo]

Many of us can do 75minutes+ on a 40 of O2 especially when a 10ft stop is easy? what's the problem?

Me too, but a plan for a higher SAC for bailout.

 

[J-Vo]

I am not sure that statement is accurate. But it is certainly subjective. What dive plans did you have in mind?

How about EOL at JB with two 50s and no stages.

 

[justinthedeeps]

Still only 1 o-ring from total gas loss.

The cylinder neck o-ring? I guess that is technically true.

Has someone seen a cylinder o-ring fail with loss of gas? Honest question. Had that cylinder been inspected and received a fresh o-ring within the past couple of years? Some trimix bailout cylinders are "permanent" and never serviced for up to decades. So yeah your comment does matter here.

The H valves I think have two o-rings at the joint? Just like manifolds? I mean it literally is exactly like a manifold, and serves the similar purpose of protecting against gas loss due to regulator failure. Plus regulator redundancy.

 

[flymolo]

The cylinder neck o-ring? I guess that is technically true.

Has someone seen a cylinder o-ring fail with loss of gas? Honest question. Had that cylinder been inspected and received a fresh o-ring within the past couple of years? Some trimix bailout cylinders are "permanent" and never serviced for up to decades. So yeah your comment does matter here.

The H valves I think have two o-rings at the joint? Just like manifolds? I mean it literally is exactly like a manifold, and serves the similar purpose of protecting against gas loss due to regulator failure. Plus regulator redundancy.

Yes I have seen bubbling from tank neck o rings

 

[Whitrzac]

Yes I have seen bubbling from tank neck o rings

But not failing catastrophically underwater...

 

[flymolo]

But not failing catastrophically underwater...

No thankfully not