Independent tanks type C and process pressure vessels must be designed to meet the requirements under Part 54 of this chapter, except Sec. 54.01-40(b), and:
(a) The calculation under Sec. 54.01-18 (b)(1) must also include the design loads determined under Sec. 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.