Kegs would be a good idea if they are big ejough for you. You could even weld a couple together if need be.
If I read right, you said picking up a chrap tig? Why not just get a wire feed? I would think it would be cheaper, easier and faster and more mobile welding
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I never welded stainless. But I was told TIG was the most water tight. I can get one for $200 that I am sure is not the best but if it last through the project I am good.
I have some kegs but needed larger conainers. It will not be holding much weight besides the metal and a few hundred gallons of water. I just need to build it in my backyard and then get a warehouse when I am ready to start. That way I do not have to pay rent while I am building the equipment. I can make the skid out of anything. I only need stainless for the places food products will touch. So the skid can be anything. I will also need a deck to walk on and I think I will use expanded metal, diamond plate or something. The stainless I need is the drums. for the control panels and a prep area.
I have friend in the scrap business but he is out at his ranch and turns his phone off. His wife said he should be back in a few days. But word travels out by other people coming and going. He hates being bugged about anything relating to work when he is off so I have to wait.