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From: Nigel Beighton <nigelb@ho*.co*.uk*>
Subject: 300 Bar Cylinders ?
I am slowly getting fed up with my 3L Pony cylinder pulling me
sideways, therefore, as I like redundancy/alt-air-sources, I am
thinking about switching to a twin set.
300 bar cylinders are now starting to hit the shops here and a few air
stations are offering fills, hence, I thought about twin 7Ls or twin
10Ls at 300bar. I have 300bar gauges and 1st stages that will change
to the din/screw fitting (currently A clamps), so there is not too
much problem with the other bits and pieces.
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 ?
The following info relates to the Faber cylinders (info courtesy of
Neal Harman - csneal%pyr.swan.ac.uk):
232bar - 14cm diameter, 59cm high excluding boot (adds about 0.5cm) and
valve (mine's about 6cm). Marked tare weight 8.1kg.
300bar - 14cm diameter, 60cm high excluding boot and valve. Marked tare
weight 10.1kg.
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 went for the 232 bar set and run them as independent twins for
cave diving. They're very comfortable both back mounted or as side
mounts. In fact I started using them more and more in my general
ocean diving instead of a 260 bar 10l cylinder.
I chose the 232 bar cylinders as 300 bar fills are few and far between
and the thought of those extra 4kg wasn't appealing either.
Greg Ryan gregr@cs*.su*.oz*.au*
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