Cylinder gas - Original contents, such as 02, N2, C02, mix, etc. If the returning unit desires the refund of deposits previously paid to be credited to an account other than the one shown on the original purchase order, indicate the new account number in the remarks column for each purchase so affected. Signatures - Verify that the form contains proper approvals. Forward the cylinders being returned to, or arrange to have them picked up at, the same dock the cylinders were originally received. When the cylinders are delivered to the vendor, the University employee responsible obtains the signature of the vendor's driver on the form.
Valves can corrode and the cylinders become dangerous.
Therefore, it is recommended that no cylinder be held by a unit more than two years regardless of contents remaining.