Gas Switching Protocols

[nereas]

well, your first sentence exactly illustrates my point.

regarding your question, I see it as an additional aid, but as a backup to a solid protocol. for example I follow the protocol and deploy a 2nd stage at 70' and look and see its a yellow cover then I have a question to answer for myself.

however, I really set up my gear that way as a way of helping ensure I dedicate one piece of gear to 02 for cleanliness/maintenance purposes more than for anything else.

There are risks to relying on colour coding.

Having said that, my 100% O2 2nd stage is yellow, and that reminds me not to touch it until I get to 20 fsw. It shines white at depths where yellow does not glow. And also in the dark when my cave light shines upon it.

Other than that, I would avoid colour coding schemes.

 

[nereas]

You've got the N and the O wrong:

"N" = note marked mix/MOD
"O" = observe actual depth

There is no "Name/Is this My Tank?"

Yah, if its attached to me, it's mine.

And since it's marked with mix and mod, that is what counts.

I like the idea of painting my name on all my bottles, for when you are on the cluttered boat. But once in the water, what's mine is mine and I don't recheck that.

 

[nereas]

If I am wearing all my deco bottles to the left, then the travel mix (defined as the leanest of the O2 mixes in the deco plan) is the one first attached to my hog rig. This is the one I want to be most accessible, since that is the one I will use for travel if my backgas is hypoxic, and since that is the first bottle I will go to during the re-ascent.

The other 3 bottles are then attached to this one, at the lower connection of it, and behind it.

After the first deco bottle, when I am reaching for the next one, I am going to reach back and unclip it, and bring it in front of me, and take a good look at it to verify it is the right bottle.

None of this nonsense "ask you buddy if it's right."

Then once I know it is right, I will show it to my buddy and ask him to confirm with a ?-sign and point and OK.

Breathing the wrong mix at the wrong depth is a good way to get toxed.

Being buddy dependent is another good way to get toxed.

 

[Blackwood]

None of this nonsense "ask you buddy if it's right."

Then once I know it is right, I will show it to my buddy and ask him to confirm with a ?-sign and point and OK.

...huh?

 

[texdiveguy]

From nereas SB bio.:

"About nereas

Biography
It has been fun posting on Scubaboard for the past 6 years. But alas time to move on, now. We have a really great local dive group in our area which is taking up most of my free time. And besides that there are lodge meetings I need to go to, and also teaching the adult Sunday school class that I need to do.

What I got out of Scubaboard is a great Nitek HE for $500, practically new with only 10 dives on it for half price. I have ocean-tested it and it works great for nitrox and helium diving with up to 7 gas switches (6 is all you would ever need, actually).

I have tried to share with everyone on Scubaboard several generalizations for good diving.

....................................

I will check in occasionally, but otherwise this is goodbye."




???- Is this one of those times when you are just 'checking' in with us so ill informed-??? You are probably a nice guy with a well intended interest in all us......but we all get by somehow- someway. Amazing is it not.

 

[ppo2_diver]

I also have posted gas switching procedures from my class on my blog.

Precision Diving Blog Gas Switching Procedures

 

[coldsmoke]

What is re-ascent?

Hunter

 

[Rick Inman]

Is this one of those times when you are just 'checking' in with us ...

Like a rock star's farewell tour...

What is re-ascent?

Hunter

Have you not observed my bouyance skills?

 

[Blackwood]

Have you not observed my bouyance skills?

I like you misspelling, since it aptly makes buoyancy look like "bounce"

 

[rjack321]

Because you're significantly affecting the efficiency of your decompression for no apparent reason (your tables don't take this into account). I'm not referring here to the practice of going to back gas for the last minute of your stop (although I don't really understand the logic in this either, but it's harmless) - this poster stated they complete the entire 30 ft. stop using back gas. On shallow dives, it doesn't matter. But on longer deeper dives it will, so there is some point at which you will have to break this "habit" - so why do it at all?




My turn to ask why?

Jeesh what a train wreck this has turned into...

If you are doing a neohaldanean deco curve, doing the whole 30ft stop on backgas will not be good. I don't shape my deco like that though. Mixes as low as 10/70 can be breathed at 20 or 30ft so I don't see what kind of dive would preclude using backgas for "air breaks". >400ft I suppose.

I would not use tactic stuff as a "backup" to a solid set of tank markings. Its just too easy to get the wrong reg on a bottle or even end up using other (buddies) bottles etc. Just mark the cylinder, ultimately that's what you breath.