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> From owner-techdiver@opal.com Mon Aug 22 16:30:44 1994 > Date: Mon, 22 Aug 1994 14:49:16 GMT > From: harry@ra*.de*.co*.uk* (Harry Railing) > Reply-To: harry@ra*.de*.co*.uk* > To: techdiver@opal.com > Subject: Re: O2 Cleaning Limits (was Borderline Technical Training) > X-Mailer: PCElm 1.10 > Lines: 21 > Content-Length: 1444 > > For the temperatures and pressures that we as divers are involved with, > the main reason for the 40% O2 limit is to do with the ppL2 where L2 is > the square of the number of lawyers in a 100 mile radius. The secondary > reason is as you assumed to do with the FO2 not ppO2. It is worth remembering > that pure O2 is used for welding, garages have a lot of grease around and I > have never heard of an explosion in a garage caused by grease, dirt and O2. > Have you? No, I haven't, but on the other hand, garages are seldom pressurized to 200 bar with purre O2. Now seriously, My O2 tanks are degreased with soap water, then extensively flushed with water and then dried with compressed air from my compressor. Taps are cleaned with trichlorethylene (sp?). Nitrox mixing is done by partial pressure method, that is filling O2 into the tank and topping off with air from my standard scuba compressor (at least 30 years old and spitting oil, but delivering very clean air). All Swiss cave divers do it that way, and there has never been the slightest problem. First stages of regulators are cleaned (though I know a guy who never cleaned his first stages) but not second stages (even for pure O2). Cheers Michael Walz walz@la*.ep*.ch*
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