[Finless]

OK, I understand that extra lead is needed but these must be the way forward? The extra pressure and hence amount of gas available for the weight of the cylinder must make them a good thing?

I have no idea how much they cost ................ 'king expensive I imagine?

 

[Finless]

Just had a Google and high pressure carbon fibre tanks - Scuba Diving Board seem to have covered most of the points?

Oh well, back to rediscovering oxygum!

 

[chrisch]

Our LDS sells composites.

Bouteilles de plongée | Splash Aquasports SA

As you see the 10L is €415 as against a std 12 (200 bar) steel of €230

I know quite a few folk that use them and they are OK if you want the 300bar capacity. The problem for you ingish folk would be getting fills I would imagine? Over here where 200 bar is the standard and so 190 is a "good" fill in our 232 tanks the composite is attractive as a 300 bar alternative.

Chris

 

[nigelH]

OK, I understand that extra lead is needed but these must be the way forward? The extra pressure and hence amount of gas available for the weight of the cylinder must make them a good thing?

Extra pressure doesn't do much for you are the Van der Waal forces mean you get less and less gas for the extra bar.
Also I gather they have a rather restricted life in sea water.

In another thread a maths error was distorting the picture. 4x400 sadly isn't 16000.

(edit)But if they are x-rayable maybe you could take them on aircraft so they would not eat you wallet as excess bagage as steel ones do but then where in the world could pump you 400 bar and not have cylinders for hire?(/edit)

 

[milldog]

OK, I understand that extra lead is needed but these must be the way forward? The extra pressure and hence amount of gas available for the weight of the cylinder must make them a good thing?

I have no idea how much they cost ................ 'king expensive I imagine?

I have one of these spun carbon fibre around Ali cylinder working pressure 350 bar and it can be filled with air in under 15 seconds !!!!!

ex fire service breathing cylinder, very light and you'd need loads of lead

I'll post a picture at some point

Graham

EDIT: too light for diving

 

[Steve Summers]

The extra pressure and hence amount of gas available for the weight of the cylinder must make them a good thing?

My knee ligaments are made out of that stuff, probably the reason my leg floats

Safe diving,
Steve

 

[Paddy Diver]

I have two 9L ones, think there kinda stupid myself,dont often use em because of the weight needed with them.

And as has been mentioned, ya they do have a limited life-span compared to steel ones.

And I had heard that oxygen from nitrox or whatever has a bad reaction (but not 100% sure) to the carbon fibre, unless you got the ones with the ali shell inside.

Ian

 

[Finless]

Lobbocks! Given the extra cylinder weight of a 300 bar cylinder (compared to the 232) I thought that maybe there is a 400 bar cylinder I can pick up and hence the desire to have one ......................

Oh well, in my dotage I shall drop from twin 12s back down to a single 10 and, maybe, one day, a 3 ltr.

On the bright side, one day I'll be using a kin great J but, on the down side, it'll be helping keep me alive in hospital ....................... I wonder if, in view of my diving past, they'll give me manifolded twin ½ J's?

 

[MATTBIN]

Lobbocks! Oh well, in my dotage I shall drop from twin 12s back down to a single 10 and, maybe, one day, a 3 ltr.

twin 3's, or even twin 2's might be better mate

Matt

 

[Finless]

twin 3's, or even twin 2's might be better mate

Matt

Perhaps just twins ....................... mmmmmmmmmmmm

 

[MATTBIN]

Perhaps just twins ....................... mmmmmmmmmmmm

Oh go on then I'll bite.......
It might improve your SAC.

Matt

 

[Finless]

Oh go on then I'll bite.......

Now you are beginning to frighten me!

 

[chrisch]

Oh go on then I'll bite.......
It might improve your SAC.

Matt

I hate to think what's in Finless' sack.....

 

[Dan Wilko]

Oh go on then I'll bite.......
your SAC.

Matt

Oh dear

(how bored am i to point that out!?)