[flyingfrizzle]

I done some work in a Silicon tetrafluoride plant and ran a bunch of monel tubing. Silicon tetrafluoride is extremely corrosive and the lines were very high pressure as well. Monel was the best metal that would hold up to the pressure and corrosiveness of that gas made in the plant. The cost was crazy high for the monel tube piping. It was 10x the cost of 316L stainless. Also the weight of the material was very heavy as well. A tank made from it would last forever but would be heavy. I dont even want to think about how much it would cost to have one made in it.