Air Fills - Age of Air

[miketsp]

Actually I think some chemical engineer on this board proved your point in an old post that I don't feel like searching for, but I agree with you. To consume enough oxygen to create a hypoxic mix the tank would be too rusty to hold pressure

Maybe you were thinking of this post
http://www.scubaboard.com/showpost.php?p=622009&postcount=6

in this thread
http://www.scubaboard.com/showthread.php?t=58076

This was for the case of an EAN mix but the formulas are the same.

 

[wedivebc]

OK, I don't have stats either. Why do you believe most do know what they are doing? I've come to my belief by talking to people who are inspecting tanks. They are usually not only ignorant of proper proceedures, but they believe myths about tanks. How often do you have a tank inspected where they actually remove all the sickers?



Why do you think there's a difference? Unless you are taking a bottle to a shop to get it filled, how would it come into play?

I can't argue one way or the other about MOST but I have seen some pretty sloppy inspections done. I can think of 3 different operators where an inspection consisted of running an eddy current machine over the threads, no blip = tank good. No further inspection was done, valve reinstalled. One of cases was a shop employee and I commented on it. The reply was "that's how I was taught" . The other 2 cases it was the shop owner so since it wasn't my tank being inspected I held my tongue.