General.

Independent tanks type C and process pressure vessels must be designed to meet the requirements under Part 54 of this chapter, except § 54.01-40(b), and: (a) The calculation under § 54.01-18 (b)(1) must also include the design loads determined under § 154.406; (b) The calculated tank plating thickness, including any corrosion allowance, must be the minimum thickness without a negative plate tolerance; and (c) The minimum tank plating thickness must not be less than: (1) 5mm ( 3/16 in.) for carbon-manganese steel and nickel steel; (2) 3mm ( 1/8 in.) for austenitic steels; or (3) 7mm ( 9/32 in.) for aluminum alloys.