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I think we're still hung up between us and them. As Kevin wrote between the "aware" and the "unaware." Mike Zimmerman wrote: >A nitrox sticker is a very public >way of announcing that the tank _may_ not contain simple 21% air Sorry, I dont agree. There is no "may." A nitrox sticker announces what the tank contains (or in reality what it ought to contain.) It is only by implication that one concludes that it does (or should) not contain *anything* except what its identification says. I think you're reading in and interpreting a little too much. A nitrox sticker says the tank contains EAN. Not Argon, not CO2, not air. As we're better educated and informed on the topic, this discussion, for us, may be no more than hair splitting. >and that the user needs to be aware of its contents before >breathing off of it. For the trained, yes, of course. That is not exactly what it says to the untrained. >> the line. What about 20%?, 19, 15?, etc..... >What about them? The markings on the tank just told you not to use >the tank without knowing what is inside. Again, yes for the trained. >So the issue is whether a marked tank can contain a simpler mix. That conclusion does not follow. The issue is not whether 21% can safely be put in the tank. The issue is whether the contents agree with the external identification - nothing more, nothing less, and when that identification system is too confusing or can no longer be relied on, what are the consequences. 20%, 19%, 15%, and even 21% are not EAN and therefore do not agree with the labeling. It is not an issue of whether we can create situations where we can safely put a gas in a mislabeled or misleading container and use it without incident. It is not for individuals to conclude the potential safety or danger on a case by case basis. I don't think it's OK to mislabel the contents of a container just because it's not apparently dangerous. It is not the forseeable that we need to protect against. It's the unforseeable. Everything always makes sense in retrospect. I, again, want to say that I think it's a very fine hair to split - for the informed. I think for the masses it is downright confusing and perplexing. We appear unclear, disorganized and undisciplined when we rationalize away the rules for our own ends and bend them as we each see fit. Art (Rat) Smith
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