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Does this mean you have NOT measured the tanks you used before this "measurement-day" ??? So you did 4 dives a week for 2 1/2 years not knowing what mix you were diving ??? And you are speaking about added safety ?? As long as you do not push the pO2 limits you might be in a safe range, but it is not ok not to measure the tanks.=20 Normally there should be a fill-logbook for the tanks and you should measure and log them. Or start mixing your own stuff and of course measure them. There has been a few threads about mixing and tank-rolling etc on the list, so it might be good to check the archives. I am really wondering what shop would fill Nitrox-tanks without letting the customer measure for O2 contents. Normally (especially in the US) they always wanted me to do that at least for liability reasons. Even in Italy where they are much more relaxed about reliability-stuff they wanted me to do that. Only in the UK and in Egypt i noticed that = it is up to you to measure it and they have no fill-log at all. (not in general but at least in one place) Also the US is the country to have c-cards for when you=B4re a = foreigner. In UK and Egypt nobody gives a shit. I was also asked :"You don=B4t trust us, because you want to measure = the tanks??" When diving Nitrox it is no big deal to measure it and +-1 or 2 might = be OK for you. When diving Trimix the margin for errors is getting smaller and more measurements must be made. It is a wise idea to measure all tanks and 5% is a bit much off the line. Did they roll the tank before measuring ?? (This sentence is to keep = the bandwith busy ;-) ) Michael >Dear List, > >I am a recent subscriber to the list and have a question that has been >bothering me for some time. >I am at the low tech end of tech diving. I was nitrox certified 2 = 1/2 years >ago, primarily for increased bottom time and an increased safety factor. I >do four 60-80 dives in a day and nitrox has been a God send. Unfortunately, >I have come to the realization that the limiting factor in = spearfishing is now >my out of shape ass. >Anyway, I was going to a local dive shop for my nitrox fills, never giving >them any consideration. He would mark the oxygen percentage on the tanks >with a magic marker written on a piece of tape. >Everything was great until two of my friends went to this dive shop to >themselves get nitrox certified. They sat through the theory part of the >class and towards the end of the evening, the instructor/dive shop owner >wanted to show the class how an oxygen analyzer works. The = previously filled >nitrox tanks were sitting along the side wall so he grabbed one of the tanks >to show the class. He measures the first tank and shows the class that it >has 33% oxygen. Unfortunately, the piece of tape on the tank says 32%. The >next tank is also off by 1%. The next tank is off by 1.5%, the next by 2%. >The final tank was off by 5%! >His explanation was that he had someone else do the fills. The new person >did not wait long enough between the time the tank was filled to do = the oxygen >measuring. He says that the additional time is needed so the oxygen can mix. >Has anyone ever heard of such a thing? >BTW, since this occurred, I felt I could no longer trust this guy. I have >four six foot oxygen tanks in my garage which I use to pump up our nearly >empty tanks to about 1000 lbs of oxygen I bring these tanks to the dive shop >(with his knowledge of what I am doing) and have him fill them. Once home, I >then measure the tanks myself for their oxygen content. >I would appreciate the list's comments. > >Thanks much, > >Dave P >Bonita Springs FL >-- >Send mail for the `techdiver' mailing list to = `techdiver@aquanaut.com'. >Send subscribe/unsubscribe requests to `techdiver-request@aquanaut.com'. -- Send mail for the `techdiver' mailing list to `techdiver@aquanaut.com'. Send subscribe/unsubscribe requests to `techdiver-request@aquanaut.com'.
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