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Date: Thu, 18 Apr 1996 04:44:55 -0700
From: George Irvine <gmiiii@in*.co*>
Subject: Re: New angle 300 bar
To: Dave Mabry <dmabry@mi*.co*>, bruce_butler@cc*.wd*.di*.co*
Cc: cavers@ge*.co*, Mario Nicola <colacave@di*.ne*>, techdiver@terra.net


  The reason they vacuum the tanks is to be sure nothing got back-filled in, 
like acetalene from a welding torch, or argon from manifolded gases with
helium, 
or any of the other gases that get used together. With scuba uses, this is even 
more of a problem. When you buy gas, you want the gas you are buying. Pulling a 
vacuum on the tanks is no big deal. These guys have huge fill stations that can 
vacuum the whole rack at once and then fill them. In medical uses there may be 
humidifiers hooked in at the point of use, but the gas in the supplied bottle
is 
nothing but the gas. Why the officous dive industry wizzards feel they must 
speculate about who is in Grant's tomb has always been the real mystery to me. 
Why is it that this sport has more mininformation, bozonity, stupidity,
heresay, 
old wives tales, and general nonsense than witchcraft? - G

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