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I'm sorry to have to ask this again. I wasn't clear enough with my original question. I understand the general protocol about cleaning and the positions of the various camps in this issue. Personally, my facility is going with the sensible logic of the Scubapro approach: "Since recreational diving equipment is not normally maintained and logged to more rigid guidelines such as the diving activities under NOAA, OSHA, or the U.S., Navy" we chose the more conservative stance that equipment exposed to an FO2 over 23.5% be cleaned, compatible and designed for oxygen service. Only staff members who are certified service technicians from both the equipment manufacturer, and an appropriate training agency versed in EAN handling and techniques will be allowed to work on this equipment. My problem is this: A diver is certified to buy and use EAN 50. He goes into a shop, buys a tank, and says he will never use it over 40%. They fill it, label it, don't clean it, and he leaves. He uses it for a while keeping the FO2 under 40%. Some time later, he wants to put 50% into the cylinder. He takes it back where he got it. They clean it correctly. Question: Does the labeling change? The problem I see is when he comes to my shop. If the labeling doesn't change after it is cleaned and serviced, how do I identify 'cleaned and serviced' cylinders from those not. I am not concerned with the *true* cleanliness of the cylinder - ie whether it has been contaminated or not, just the external identification of a cleaned and serviced "over 40%" cylinder from one not cleaned. How can I tell them apart? Thanks again Art (Rat) Smith
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