Which TWINS

[Twinsetmad]

Originally Posted by macstinator

i have Faber 232's with a holycon 300 bar manifold. sweet. until last week i took them into a certain Glasgow based dive shop. they filled them up to 350bar. nearly shat myself. just as well they were up for test.

This shouldn't happen for exactly this reason... 300 bar valves on 300 bar tanks....232 on 232....you shouldn't mix and match..its asking for trouble

[Bardo]

Originally Posted by Twinsetmad

This shouldn't happen for exactly this reason... 300 bar valves on 300 bar tanks....232 on 232....you shouldn't mix and match..its asking for trouble

Indeed - couldn't agree more.

I used to buy into the old GI3 mantra of putting 300-bar valves onto 232-bar tanks but now I think it's just asking for trouble (nowt as pure as a reformed whore and all that). Stick to 232-bar valves on 232-bar cylinders as it'll give the bottle monkey one less opportunity to kill himself...

[MarkP]

Originally Posted by Bardo

They are quite pricey - £420 - but are the absolute dog's nads, as far as I'm concerned

Huh. £420 and you STILL have to buy boots.

[neilh]

Originally Posted by Twinsetmad

This shouldn't happen for exactly this reason... 300 bar valves on 300 bar tanks....232 on 232....you shouldn't mix and match..its asking for trouble

On the other hand you'd hope that the filling centre would check the rating of the cylinder itself and not go by the number of threads on the valve.

My ali80 has a 232 bar valve - but it's only supposed to be filled to 200 bar.

[MarkP]

Originally Posted by neilh

On the other hand you'd hope that the filling centre would check the rating of the cylinder itself and not go by the number of threads on the valve.

Some hopes! Also, some filling centres have their 300bar whip run directly off the compressor, so there's no real metering for it - just fill until the compressor runs out. I agree with Bardo, it was one of GI3's oddities.

Originally Posted by neilh

My ali80 has a 232 bar valve - but it's only supposed to be filled to 200 bar.

I'd worry far less about steel being over filled...

[macstinator]

even still, 350bar is a tad much, even for a 300 bar cylinder, no? and its hardly my fault for having 300 bar valves.

[neilh]

Originally Posted by MarkP

Some hopes! Also, some filling centres have their 300bar whip run directly off the compressor, so there's no real metering for it - just fill until the compressor runs out. I agree with Bardo, it was one of GI3's oddities.
...
I'd worry far less about steel being over filled...

Steel would certainly tolerate it more - but I'd be annoyed with anywhere that just hooked up my cylinders and filled until the compressor ran out. Cylinders are rated for a reason and there's no excuse not to fill them properly.

Bet they'd complain if I hadn't O2 cleaned my own cylinders properly

Originally Posted by macstinator

even still, 350bar is a tad much, even for a 300 bar cylinder, no? and its hardly my fault for having 300 bar valves.

Bound to be your fault

[Sipadan]

just because you use 300 bar cylinders, it doesn't mean that you have to have 300 bar fills. i have a set of 300 bar 7s that i've never even attempted to get a 300 bar fill for. i chose them because they mean less lead. having said that, i could not trim 232 bar 10s and would imagine that 300 bar 10s would be worse, so proceed with caution. with the options you have given, i'd go for the 232 bar 12s.

[Tricky]

Originally Posted by Peter M

usually you get 310 bar fill, cools to 290, lowers to 280ish hitting water, i still got more that the 220bar i end up with in my 232 fills

Did you read Nigel's article? You might get more gas, but not as much as you think. According to the article, up to 232 bar you get pressure times cylinder volume. Beyond 232 bar, you get less.

I used to dive 300 bar 12s when I dived singles but can't say I noticed any benefits from the slight increase in gas. They were a pain in the arse to lug around though, and I frequently had issues with the valves and my regs (which I've never had with 232 bar valves).

[Scuttler]

Originally Posted by Bardo

The absolute best twinsets you can buy at the moment are these... Halcyon UK

They are quite pricey - £420 - but are the absolute dog's nads, as far as I'm concerned

But the AGIR Bands are better