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From: "A.Appleyard" <A.APPLEYARD@fs*.mt*.um*.ac*.uk*>
To: techdiver@terra.net
Date: Mon, 27 Nov 1995 11:33:21 GMT
Subject: Using carbon dioxide cylinders for compressed air diving

  Prof vd Walt 529-8025/8262 <FIS1@sh*.up*.ac*.za*> wrote about using carbon
dioxode cylinders as compressed air scuba cylinders:-
> ... I have not kept up with the changes in specs, but I have no doubt that
> some investigation will bring to light cylinders that couls be used. Is it
> really worth the trouble these days? Are the differences that big in price?
> I have a suspicion that if you find a lightweight CO2 [= carbon dioxide]
> tank with the right specs, that it will cost the same as the corresponding
> SCUBA tank. ...

  A diving club that I was in used big CO2 cylinders as air reservoirs for its
compressor. But likely nowadays most CO2 cylinders and CO2 fire extinguishers
are engineered to their requirements (c.60 bars needed to liquify CO2 at
ordinary temperatures) and no more, and are not safe to use for scuba
pressures. Get them tested for air first, if you must attempt such a thingq.

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