I got this tank in a swap out program at welding supply shop - and am trying to figure out if it is almost empty or not. I don't see a TW though, so not really sure how to estimate what is left. It currently weights 30.3LBs.
Thanks, very useful. I am going to take this back to the place that swapped me into this tank, and get them to swap me into another one that isn't such a POS. Would be nice to have at least a TW on itCan't help you with the Tare weight, but I can tell you what most of the other stamps on the tank refer to.
The DOT 3AA ..2015 means that the tank is a seamless steel tank, in accordance with the Dept of Transportation specs, with a working pressure of 2,015 psi. It was manufactured in 1980, and the plus after the 80 meant that it could be overfilled filled to +10% until the next hydrostatic test.
The number highlighted in white paint under the DOT stuff is most likely a serial number.
Each of the other dates on there, with a month, marks from the tester, and year, refer to other hydro tests. The most recent seems to be 2012, though it's had a hard life with all the rust on the teflon tape at the neck.
CO2 tanks are typically filled by weight, not pressure, but the tanks are marked by pressure.