I have a Manway cover that is a 20" 300# blind made of SA-350-LF3 (3-1/2 Ni) steel that needs a new manway cover.
There is a long delivery on a new 3-1/2 Ni manway cover, but I can get a 304SS manway cover off the shelf. The 304SS is acceptable for the cold service. I would have to mate it to...