marking MOD

[David]

here in the uk we use metric for depth.
I am not DIR but somethings make too much sence to ignore them

now I am confused about tank decals. while chatting about this I have the following questions :-

can cylinders be marked in feet aswell as metric, How do we know whats what

if I stumble accross a cylinder with a 20 written on it will it besafe to breath at 20 meters.

David with a loaded question

[ogobara2000]

if I stumble accross a cylinder with a 20 written on it will it besafe to breath at 20 meters.

David!

DIR is about applying certain rules and attitudes, e.g. dive planning, using standard gases and most important buddy diving (i.e. one with the same attitude).

If you stick to that you don't generally stumble across a cylinder with something written on it and not knowing what it means.

To put a concrete answer to your question, if you would find 20 written on a tank and if it would be imperial it would be a pure oxygen tank which if labelled right would have OXYGEN written next to it...in which case i would not like to breath it in 20m

cheers,
Osama

[Davey Willo]

Hi David

As you say over here we dive metric and so one would never mark MOD's in feet, also you would never see a 20 decal in Europe, only 21 which is our 21m 50% bottle.

As Osama rightly states, our 6m, 100% bottle would have the 6 decals plus the word OXYGEN running along the length of the bottle.

The MOD decals are placed in the 3 o clock and 9 o clock positions at the top end of the cylinder so that both diver and buddy can identify the cylinder and confirm the depth before even deploying the reg/hose.

HTH's

Dave.

[Jules]

Surely you would not breath off ANY tank if you hadn't tested it yourself? If I picked up a tank and it had an MOD or nitrox %age marked I would still test it myself and the supplier should test it in your presence so that you agree and sign for your mix. Every supplier of Nitrox in th uk would do this wouldnt they???

[Brass Monkey]

Originally Posted by Julia C

Surely you would not breath off ANY tank if you hadn't tested it yourself?

By this I take it that before every dive you test all the gas your buddy is diving?

[David]

Julia no im with you on this. I would not be breathing of an unknow cylinder unless all of my usable gas had gone :-(

The MOD decals are placed in the 3 o clock and 9 o clock positions at the top end of the cylinder so that both diver and buddy can identify the cylinder and confirm the depth before even deploying the reg/hose.

in what format if you passed me a reg and checked the decals saying 20 how would i know I could breath from it if I was at 20 meters ?

David

[Brass Monkey]

Originally Posted by David

Julia no im with you on this. I would not be breathing of an unknow cylinder unless all of my usable gas had gone :-(

The MOD decals are placed in the 3 o clock and 9 o clock positions at the top end of the cylinder so that both diver and buddy can identify the cylinder and confirm the depth before even deploying the reg/hose.

in what format if you passed me a reg and checked the decals saying 20 how would i know I could breath from it if I was at 20 meters ?

David

Surely the markings would be known to all members of the team before the dive! I find it hard to imagine coming across a cylinder with markings that I did not understand, unless of course this belonged to someone not diving in the same team. Then you would obviously leave it alone.

[David]

to put this all in perspective. It started with a photo that was commented on that the decals were upside down and they did not need an M to denote metric. not understanding DIR enough I was hopeing for an answer that cleared up the answer.

In general a diving team should know everyones role so the team then functions as a group. but I thought the wholepoint of DIR was that every body dived the same all the time so the answer should be the same when ever asked.
so I was hoping for a reply like it is done this way and should be marked like this.
I did ask this question in DIR forum for that reason

David

[Dr Stevil]

if I stumble accross a cylinder with a 20 written on it will it besafe to breath at 20 meters.

If I stumbled across a cylinder with 20 written on it I think my reaction would be "Oi! which one of you muppet's calls himself "20" ??"

Seriously, Jules is right, you'd want to test it yourself and "Caveat emptor" anyone that didn't.

Originally Posted by Brass Monkey

By this I take it that before every dive you test all the gas your buddy is diving?

No need if you're not diving with a muppet who wouldn't test the gas theirself, which is pretty basic to using nitrox.

[Brass Monkey]

Originally Posted by Steve W

No need if you're not diving with a muppet who wouldn't test the gas theirself, which is pretty basic to using nitrox.

You don’t say! Come on Steve if I could be arsed I'd find a link that explained the meaning of sarcasm.

Originally Posted by David

I thought the wholepoint of DIR was that every body dived the same all the time so the answer should be the same when ever asked.

It's good question David, I don't know if they use metric outside of the USA. What is GUE policy on cylinder markings, if you mark them in metric are you still doing it right. Confusing? try working in an industry that uses metric for lengths and imperial for diameters!

Dave.