{"data":{"id":"us/46-cfr-154.447","jurisdiction":"us","citation":"46 CFR 154.447","heading":"Allowable stress.","body":"(a) An independent tank type B designed from bodies of revolution must have allowable stresses 3 determined by the following formulae:\nσm≤f\nσL≤1.5 f\nσb≤1.5 F\nσL + σb≤1.5 F\nσm + σb≤1.5 F\nwhere:\nσm = equivalent primary general membrane stress 4\nσL = equivalent primary local membrane stress 4\nσb = equivalent primary bending stress 4\nf = the lesser of (σB/A) or (σY/B)\nF = the lesser of (σB/C) or (σY/D)\nA, B, C, and D = stress factors in Table 2.\nTable 2—Values for Stress Factors\nNickel steel and carbon manganese steel values Austenitic steel values Aluminum alloy values\nStress factors:\nA 4.0 4.0 4.0\nB 2.0 1.6 1.5\nC 3.0 3.0 3.0\nD 1.5 1.5 1.5\n(b) An independent tank type B designed from plane surfaces must have allowable stresses specially approved by the Commandant (CG-ENG).","path":["Title 46—Shipping","CHAPTER I—COAST GUARD, DEPARTMENT OF HOMELAND SECURITY","SUBCHAPTER O—CERTAIN BULK DANGEROUS CARGOES","PART 154—SAFETY STANDARDS FOR SELF-PROPELLED VESSELS CARRYING BULK LIQUEFIED GASES","Subpart C—Design, Construction and Equipment"],"source_url":"https://www.ecfr.gov/api/versioner/v1/full/2026-08-25/title-46.xml","current_through":"2026-08-25","vintage":"","retrieved_at":"2026-08-27T02:26:22Z","sha256":"37aa944c45648f5c4ac6d5bd339e55b24fab3e98089b760080253ff471cfb1a0","source_id":"us-cfr","stale":true,"prev":"us/46-cfr-154.446","next":"us/46-cfr-154.448"},"notice":"GroundRules: Original legal text. Not legal advice."}