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I've got a question on filling EAN cylinders from the store owner's point of view. I'm confused with the standards and practices going on out there so maybe someone can clarify this. I understand that at least one agency requires all cylinders put into enriched air service to be cleaned and labeled. Others state that for under 40% use, no cleaning is necessary, but I believe they are still specially marked and labeled. My question is when someone brings a cylinder to my store, how can I tell whether it has been: 1) labeled but not cleaned for less than 40% use 2) labeled and cleaned for over 40% use 3) labeled and cleaned for any mix Is the labeling different? When a less than 40% cylinder gets filled with EAN50 or EAN80, does it get a different label or marking? What if someone buys a cylinder, properly labeled for EAN, and says he will never put more than 36% in it. He goes to some other dive store and asks for 50%. He's certified for 50%. How does the dive store know the tank is clean? I can think of several ways to know its *not* clean. Regardless of your position on cleaning, the general concensus seems to be that at some point, 23.5, 40, or whatever, cylinders and valves should be cleaned. Can a fill station determine the cleaning history of a cylinder by its labeling or is there another way I'm not aware of? Art (Rat) Smith
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