Who told you that the tank needs to be replaced? There's nothing wrong with the tank, so you need to find out what's leaking that's connected to the tank. I've been through many discussions relating to replacing the tank, and in the end they confirm it was something else. I thought I needed a new one, because of the heavy surface rust. I brought it in, because my valve was stuck open. A 40+ year Yardmaster at Amerigas repaired it. I asked how long the tank was good for, and he replied "Forever". Many have been scammed and thought it was the tank, because the problem was solved when replaced, but it was the new connections, shut off valve, filler valve etc. that actually solved the problem. ASME Tanks NEVER need to be replaced.