How long do air fills remain useable?

[grf88]

I found a pair of 72's at a garage sale a couple of years ago. The owner bought them new in 1968, doubled them up, and had them filled. They sat unused since. There was 1800 psi in them when I got them. I tested the air with my new at the time cootwo, and found 20ppm CO. You hippies really knew how to party!!!

I found 17 ppm CO in an antique tank I bought. Now use it to bump test although it is now nearly empty. Will be interesting to see the inside when it finally runs out.

 

[Bob DBF]

I found 17 ppm CO in an antique tank I bought. Now use it to bump test although it is now nearly empty. Will be interesting to see the inside when it finally runs out.

Please report back here with the results.


Bob

 

[Tom Winters]

I inherited the tank that I had learned to dive with in fhe 60’s - an old steel USD 72 with a J-valve. It had been filled and forgotten after I went off to high school on my path to a long and successful career as a juvenile, and later, mature delinquent.
When I got the tank, the attached USD twin-hose reg had long-rotten hoses still on it.
The tank itself was fine, and still full of air - none of that nitrox voodoo gas since it was still decades from being invented. I had no problems with it except on every election for the past ten years, I write in “Richard Nixon” on every ballot, and I’m still royally p.o.’ed the next day when he doesn’t win.