§154.440. Allowable stress.
46 C.F.R. § 154.440
The allowable stresses for an independent tank type A must—
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
For other materials, be specially approved by the Commandant (CG-ENG).
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.
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.
Notes, amendments, and revision history
Amendments
[CGD 74-289, 44 FR 26009, May 3, 1979, as amended by CGD 82-063b, 48 FR 4782, Feb. 3, 1983; CGD 77-069, 52 FR 31630, Aug. 21, 1987]
Authority
Authority: 46 U.S.C. 3703, 9101; Department of Homeland Security Delegation No. 0170.1.
Source
Source: CGD 74-289, 44 FR 26009, May 3, 1979, unless otherwise noted.
Amendments
[CGD 74-289, 44 FR 26009, May 3, 1979, as amended by CGD 82-063b, 48 FR 4782, Feb. 3, 1983; CGD 77-069, 52 FR 31630, Aug. 21, 1987]