I just finished the bare bones build of my new pressurized oil tank which I made with inspiration from a forum member's build (who's name escapes me at the moment). I will pressurize it to anything under 30 psi and use it to feed my furnace. I added a pressure release valve that goes off at 30 PSI because I don't feel comfortable pressurizing diesel or waste oil to more than that.
I used an old CO2 tank that failed hydro testing and brazed the brass fittings onto the tank. Then tested all the seams with window cleaner fluid.
I plan to weld a single wheel on the back of it so I can roll it around easily, give it a handle to maneuver it while moving and then paint it.
I have not cleaned/washed the inside out. I wonder If I should? There might be rust inside.
I'll add a video of it later.