{"data":{"id":"us/46-cfr-154.440","jurisdiction":"us","citation":"46 CFR 154.440","heading":"Allowable stress.","body":"(a) The allowable stresses for an independent tank type A must:\n(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\n(2) For other materials, be specially approved by the Commandant (CG-ENG).\n(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.\n(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.","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":"ce70ca8cfc1c0143672a17e35306d8e99c926bcbe0c8acbcebaaa04ccc7aea79","source_id":"us-cfr","stale":true,"prev":"us/46-cfr-154.439","next":"us/46-cfr-154.444"},"notice":"GroundRules: Original legal text. Not legal advice."}