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Greetings all, first timer here so still learning how to navigate the forums and loving every minute of it. Spent years planning to get my own shop running and wife finally kicked me in the rear to get on it before the second rugrat gets here. Recently scored an old 100 lb. tank from a home remodel I'm helping with and as I was planning where to cut into this thing i decided to see if it had any leftover pressure. I opened the valve all the way but nothing came out, tank wasn't heavy or indicating any liquid might be left inside, so i went inside for a quick lunch. Came outside and heard a quiet his and wouldn't you know it I had propane pouring out of this thing. It froze to the yard and has about half an inch of frost at the bottom and the exhaust port was froze over as well. Now I've seen propane tanks get cold and frosty while barbecuing but this is kind of new for me to see the tank half frosted over. And to boot when I moved it back to the concrete i can hear something similar to a slushey inside what I might guess is a third full of liquid. I have a newer 100 lb. tank for my forge plan and still want this one for a vertical heat treating furnace, but I'm unsure if I should use/discharge the gas or find a different vessel for a furnace. Can't wait to contribute and hopefully join in on the fun. I am by no means an expert and have a wonderfully bad habit of spending hours researching and never getting around to practicing. You guys have so much knowledge and insight it's difficult to stop reading and get back to forging. Also including a pic as I'd like to know if i can figure out how to post photos for future projects. Thanks All!