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Can't say that I'm a senior tech diver, but I'm European, which gives me some background to answer your question: Until a few years ago all the tanks around here had a working pressure of 200 bar, with a test at 150% of that: 300 bar. People generally just filled their tanks to the maximum a compressor would do: 225 bar, since that is the setting of the overpressure valve on most 200 bar compressors. So someone came up with a 232 bar tank, which has a test pressure of 350 bar (again 150%). Those are the ones normally sold these days, but of course people also still use 200 bar tanks, which are indeed quite commonly overfilled. Finally: I still regularly see steel tanks that were made in the 1970s that have passed their 5-yearly checks without trouble since. Jeroen > Dear all, the recent Al tank overfill thread made me doubt on the > "overfill" concept as applied both in the US and Europe. For > instance, steel tanks are considered to have an "operational > pressure" of 200 bar in the US whereas the standard pressure for > the same tank is 232 bar (16% overfill) in Europe. > I would like some of the senior technical divers to > discuss/clarify the concept of "overfill". > � Do we systematically overfill steel tanks in Europe ? > � Does this 16% "overfill" (relative to US standards) represent a > risk in older steel tanks ? -- Send mail for the `techdiver' mailing list to `techdiver@aquanaut.com'. Send subscribe/unsubscribe requests to `techdiver-request@aquanaut.com'.
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