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Steve Lindblom, s_lindblom@co*.co* said:

>>If you want an example of what happens when you try to blindly apply
>>industrial standards to the dive world, take a look at our tanks - in the
>>USA are made to the same standard (3A and 3AA) that industrial tanks are,
>>tanks that are expected to be able to endure being dropped off the back =
of
>>trucks, stored outside, refilled daily, and still last 50 or so years. =
The
>>result? - the same tank that's an HP tank in europe is a LP tank here, =
and
>>holds 20 or 30 less cf (for those of us without a compressor).

Strange, Here in Sweden, and probably the whole EU there are no =
special rules for diving tanks. In europe the tank design rules have =
ben influenced by the ADR and RID treaties that govens the =
transportation of dangerous goods by road and rail. Above these basic =
rules each country has their own rules about filling. These rules has =
probably 5 to 10 times as many local variations as there are tank =
manufactrers.

But the basic rules are the same, and diving tanks are designed to or =
above the same minimum specs as all other tanks. A possible variation =
is that tanks for SCBA for firemen have allmost no extra material for =
rust, because the firemans back is more worth than the tank. The only =
stated difference is that diving thanks does not have to be gray to =
indicate that they contain breathing gas.


The difference that I have heard about is that the US DOT has ideas =
about that tanks must withstand gunfire. Is this true?

Another starge thi that I saw. OMS claims that low pressure tanks are =
better because the corrosion is slower at say 170 bar compared to 250 =
bar. Because of the lower PPO2. They didnt mention the PPO2 in 200 =
bar steel tanks filled with pure O2 :)

/Sten

* Sten Meyer * Mogatan 1 * SE-426 76  V=C4STRA FR=D6LUNDA * SWEDEN *

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