46 C.F.R. § 154.447 Allowable stress.
Title 46 - Shipping
(a) An independent tank type B designed from bodies of revolution must have allowable stresses3 3 See Appendix B for stress analyses definitions. σm≤ f σL≤ 1.5 f σb≤ 1.5 F σL + σb≤ 1.5 F σm + σb≤ 1.5 F
where: σm=equivalent primary general membrane stress4 4 See Appendix A for equivalent stress. σL=equivalent primary local membrane stress4 σb=equivalent primary bending stress4 f=the lesser of (σB/A) or (σY/B) F=the lesser of (σB/C) or (σY/D) A, B, C, and D=stress factors in Table 2. (b) An independent tank type B designed from plane surfaces must have allowable stresses specially approved by the Commandant (G-MSO). [CGD 74–289, 44 FR 26009, May 3, 1979, as amended by CGD 82–063b, 48 FR 4782, Feb. 3, 1983]
Title 46: Shipping
PART 154—SAFETY STANDARDS FOR SELF-PROPELLED VESSELS CARRYING BULK LIQUEFIED GASES
Subpart C—Design, Construction and Equipment
Independent Tank Type B
§ 154.447 Allowable stress.
Table 2_Values for Stress Factors------------------------------------------------------------------------ Nickel steel and carbon Austenitic Aluminum manganese steel alloy steel values values values------------------------------------------------------------------------Stress factors: A.............................. 4.0 4.0 4.0 B.............................. 2.0 1.6 1.5 C.............................. 3.0 3.0 3.0 D.............................. 1.5 1.5 1.5------------------------------------------------------------------------
