For a project for AIChE we're building a car powered by a chemical reaction. Our pressure vessel is a 9 oz chrome-moly CO2 tank used for paintball. While the tank appears in good shape and we've used it thus far with no problems, we need to show that this is safe. There is what be believe to be a 3000 psi rupture valve on the tank. Our main concern now is proving that the tank is ok to operate at ~250-300°F and < 100psi. While I can find websites that state this alloy can stand over 2000°C I'd like something more solid.

Does anybody have any CO2 tanks like this with temperature and pressure ratings on them? Proof in the form of a picture of the label or rating would be great. If this doesn't seem realistic and we're being unsafe, let me know.

Thanks.

shouldn't there be label(s) on the tank itself? the rupture disk should also have a specific rating as well.

The rupture disk has a marking of 3000 on it, which I take to be psi.

The label for the most part has peel off, and what remains doesn't have a manufacturer or rating, just something along the lines of "Moly-Chrome CO2 Tank. Caution: Contents Under Pressure" following by part of a disclaimer.