Normoxic Trimix in Mod 1???

Dsix36

I was taught to use trimix in all dives of 100' and deeper in order to minimize the risk of narcosis. I understand that a narked CCR diver may make a costly mistake if there is ever an equipment issue.

My question is this:
Should normoxic trimix be taught in all CCR Mod1 courses? Why/Why not?

let the games begin

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zmcave

I think it should be taught in a initial CCR course, especially if the diver is already familiar with helium diving, but not if it is the Open Water CCR course.
I also think the amount of helium on the mix should be limited, and mandatory deco shouldn't exceed maybe 10 minutes or so.
Bets,

Zé.

scubagrunt

[quote=Dsix36;163406
let the games begin[/quote]
stir the pot!!!

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Mark Chase

I can be narked off my head in 35-40m of water in the UK. And you need to be in 30m+ water over hear in my bit of sea to be able to see a damed thing.

Qed i did the Mod1 course then whiped across trimix from my old twinsets.

I can understand ther concern seeing as switching to CCR the biggist issue for most people is boyancy control. Bad boyancy and Helium dont mix. Id much rather pop up from 30m on air than on mix.

That said 100 hours before your allowed any mix is mad.

10-20 hours in i was perfictly happy holding stops.

There should be discretion for existing trimix and deco procedures divers but I can see how they are trying to stop you fgoing too deep too fast. I just disagree that 40m is a safe air dive on a CCR in the UK.

ATB

Mark

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Brainx3

Hi,


I think that standards have different limitations regarding mixes and gas usage for very logical reasons and I wouldn't want to exceed my limitations as a diver whether I'm diving OC or CCR. However, knowing "why" is always important even if the diver won't use any advanced knowledge within his/her course but it would develop a good sense of realization and therefore the diver will have a better safety planning. There are many people who would exceed their level of training with their experience but I think if you are ready to do it on your own then why wouldn't you get yourself into a proper course then you will find out what you are missing. At least in case of any problem you will be covered by your insurance as long as you are certified to that level


Best Regards. Wael

colinicky

Unlike Mark I was not already Tx qualified before I went to do my mod1 .I did my final dives in Stoney Cove UK ( inland quarry) & managed to get seriously narked at 35m . Imediately after this the saftey diver who was also a good friend & dive buddy lent me his spare 3l for the rest of the course ,of course I hadn't a clue what was in it
I have never dived air dill since so yes I think that a very weak tx should be allowed & taught on mod1 .
By a weak mix consider that at 40m if you have 10% He then you have an END of 30m .

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Colin

I trust my rebreather completely ,
I just don't trust the user

onwards & downwards

nigelh

I used normoxic trimix when I only had a mod 1 card but I didn't do decompression diving which I viewed as the significant part of mod 2.

I felt that I couldn't afford to get narked and stupid on a rebrether where things were just more complicated.

I've rambled on about this before and the BSAC Safety talk used me in their Right Gas article. I felt quite flattered.

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nigelh

Dutchy

"Safe Air" should not be EANx but Tx25/25 (you'll always get it right wether it is a traditional organisation or ANDI )

This mix will work for both diluent as well as bailout and gives a great END. You will just remember more of a dive and have a clearer head when the shit his the fan...

A mix like that should be part of Mod1. There isn't really much to know about Helium so the theory can't be a showstopper.

In terms of the program I's say start with air up to 20m and take the He on the last couple of dives that go to whatever the instructor wants to do and when he feels the student can hold the safetystop. (And possibly a few pyle stops?)

I do it myself now. What I really wanted was max 40 with trimix. Now I have ANDI L2 but I get my He fills based on a IANTD adv. recreational trimix card. That course BTW was taken on the Sport Kiss.

Where that leaves me in terms of options when I go to the red sea I don't know. I guess insurance could become a problem then (it is not here) but then I guess its even shallower, so be it...

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Dave Sutton

Well said.

To tell the truth:

I've stuffed that into more than one 'air divers' open circuit set up here in RI for 130 foot dives on the U-Boat. Typically they are already certified Nitrox divers who come aboard wanting a Nitrox fill, know *zero* about helium, don't need to, but are interested in the subject. I engage them in a little conversation and have a heart to heart about narcosis. If they want to try it, we stuff the bottles and they just dive the profile I hand them on a slate. I feel better as a boat captain / divemaster because I know they are in a safer state of mind in case they get snagged in mono fshing line, etc., they feel better because they have a clear head, and the training to "do it the way I tell you to do it" takes about, oh..... 90 seconds? It's better all around. We actually use 30/25 for the U-Boat guys. You can figure out if we're ANDI or 'other'. Clue: The US Navy labels gas the same way.


<psst.... don't tell anyone....>


Dave

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jiseson

A new rebreather user would be the most susceptible to narcosis i think, so why not have the safest mix in there to start with.

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