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> > 
> > As the 300 bar tanks have to be stronger, how much more do they weigh
> > when full, compared to 232 bar tanks ? Does any one have the comparative
> > weights for 7L and 10L cylinders ? Does the ~30% increase in capacity
> > justify the increase in weight ?
> > 
> > Twin 7Ls with a joint manifold and the option of adding my pony
> > centrally seems interesting - but will I be able to carry them ? 
> > 
> > - nigel.
> > 
> I found the following data.
> 
> Company   Volume  Pressure  Weight
> ----------------------------------
> Beuchat       18 l 300 bar  39 kg
> Poseidon      10 l 300 bar  17 kg (empty)
>                8 l 300 bar  13 kg (empty)
>              2*4 l 300 bar  15 kg (empty)
>              2*6 l 300 bar  21 kg (empty)
> Interspiro 2*3,4 l 300 bar   7 kg (empty) (Carbon Epoxy Composite)
>            2*6,8 l 300 bar  13 kg (empty) (Carbon Epoxy Composite)
> 
> The Iterspiro data are from memory, the Tanks are new this year and aimed
> at Firebirgades etc. They cost about twice as much as steel tanks.
> 
> I have a 2*6/300 and like it. In Sweden 300 bar tanks have been in use since
> 1970 and all stations have 300 bar air.
> 
> /Sten Meyer
>   
> 

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