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On Sat, 21 Aug 1999, Frank Riffel wrote: > Usualy you don't even have to fill it with anything. The internal volume > (ie. water capacity), rated pressure, test pressure, the empty weight allong > with other "usefull" informations is stamped onto the tanks -- at least over > here in europe. Frank, Not so here in the US. The only required markings are material code (actually, the DOT classification for the cylinder, i.e., 3AL or 3AA) and the service pressure. The only other marking (aside from optional stuff from the manufacturer) is usually the latest hydrostatic test date and tester. There are somne published data sheets, but there are questions about real capacity even so. For example, a few years ago OMS was selling a Faber made cylinder called a "95", which was stamped "95.1 cu ft" on the bell. About three years ago, the "95.1" magically changed to "98" - with all other characteristics (weight, size) remaining unchanged. So which is it? Cylinders are marketed here by volume at rated pressure, and usually the quoted volume is an approximation, rounded up for marketing purposes. At any rate, IMO it doesn't matter. The differences between market hype, actual internal volume and actual gas volume at rated pressure is so small that it has no bearing on dive planning purposes; just use the marketing number and add the usual conservatism in planning and it works out fine. But if one wants to go through the exercise of making the measurement, it's probably worthwhile just once. 8-) Regards. -- Art Greenberg artg@ec*.ne* -- Send mail for the `techdiver' mailing list to `techdiver@aquanaut.com'. Send subscribe/unsubscribe requests to `techdiver-request@aquanaut.com'.
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