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Nigel Beighton <nigelb@ho*.co*.uk*> wrote : > .... > 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 ? Mass of the 10 ltr, 300 bar cylinder is about 15 kg and 7 ltr, 300 bar weights about 10 kg (IWKA cylinders, empty, without valves). 300 bar tanks reduce significantly required weights. With 15 ltr 200 bar tank I needed 10 kg led and now with twin 7 ltr, 300 bar tanks I use 5 kg weight belt. It is also much more convienient to dive when the weight is also on your back, not only on your waist. > Twin 7Ls with a joint manifold and the option of adding my pony > centrally seems interesting - but will I be able to carry them ? I have used few times a 4 ltr, 200 bar pony with my 2x7 ltr, 300 bar tanks and that is a quite heavy set-up. I can handle it just and just in surface. One thing good to remember with 300 bar tanks is that air is about 10 % unideal in 300 bar pressure. So you have 10 % less air than ideal gas law tells. In cold water unideality still increases (in 200 bar, the factor is about 3 %). Jouni Polkko jpolkko@vi*.hu*.fi*
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