Dumb question... But necessary

Is this a an old stand up propane tank? I wanted to be sure before taking the next step.

What is the next step? If it has any amount of propane in it, it will be heavy and you can hear the propane in it if you bang it and wiggle it. If the is liquid in it you will hear a wa wa wong sound. If the next move is to cut it up to scrap it, open the valve and check for pressure

I don't think i've seen anything like it before. It's shaped like some kind of compressed gas cylinder but it comes off 3/8 at the top and has that side tapping. Best guess is that it was originally intended for compressed gas and they re-purposed it to do something else. Maybe a storage tank for an air compressor ? Have the tank laying horizontal with the side tapping pointing down ? The valve would have been the condensate drain ?

Could be most anything though ......

it looks like a repurposed propane tank to me. by the way the rust is on the top it looks like someone welded that fitting on to it themselves. I wouldn't trust it though. make sure you fill it with water first if you were gonna torch it.

whats the other end look like?

There is no attachments or welds on the bottom but i did find written message to a "Wayne" to put 2 holes in the tank. I banged on the tank and heard the wa wa wong sound as suggested in earlier in the thread, and when i put on its side and rolled it i heard a rustling sound from its contents. Im busy Friday working and taking a load of short steel and car batteries to the yard, but will have time on Saturday to work on it. Should i try to connect a air hose to the valve to check for pressure? Or should i try to open the plug on the other side? Thank you.

Oh im sorry! On the opposite side of the tank there is another welded hole with a square plug screwed on. I dont have the picture posted yet. Will do tomorrow. Getting use to posting... This is my first time on a forum. Thanks for your patience

Kind of looks like a propane tank we would have on the back of a forklift. I haven't drove a forklift in 17 years so I could be wrong.