StacksVerified U.S. regulatory reference

46 CFR §154.440

Verified against eCFR.gov as of June 20, 2026View official text on eCFR.gov ↗
  1. (a)The allowable stresses for an independent tank type A must:
    1. (1)For tank web frames, stringers, or girders of carbon manganese steel or aluminum alloys, meet σB/2.66 or σY/1.33, whichever is less; and
    2. (2)For other materials, be specially approved by the Commandant (CG-ENG).
  2. (b)A greater allowable stress than required in paragraph (a)(1) of this section may be specially approved by the Commandant (CG-ENG) if the equivalent stress (σc) is calculated from the formula in appendix A of this part.
  3. (c)Tank plating must meet the American Bureau of Shipping's deep tank standards, for an internal pressure head that meets § 154.439(a), published in “Rules for Building and Classing Steel Vessels”, 1981.