I would not use that tank. It is too old to be trusted with your life. The whole outfit is an antique. Not worth $20.
Looks like a combination compressor / belt sander

He said they never explode they just let go at the weakest point. For it to explode you need a totally "sound" tank to be over pressurised with no safety release.
I love it when something that is old is rebuilt and brought back to being asefull tool.
