{"data":{"id":"us/46-cfr-154.1848","jurisdiction":"us","citation":"46 CFR 154.1848","heading":"Inerting.","body":"(a) The master shall ensure that:\n(1) Hold and interbarrier spaces on a vessel with full secondary barriers are inerted so that the oxygen concentration is 8 percent or less by volume when flammable cargoes are carried;\n(2) Hold and interbarrier spaces contain only dry air or inert gas on:\n(i) A vessel with partial secondary barriers;\n(ii) A vessel with full secondary barriers when non-flammable cargoes are carried; and\n(iii) A vessel with refrigerated independent tanks type C;\n(3) When cargo tanks containing flammable vapor are to be gas freed, the flammable vapors are purged from the tank by inert gas before air is admitted; and\n(4) When gas free cargo tanks are to be filled with a flammable cargo, air is purged from the tank by inert gas until the oxygen concentration in the tank is 8 percent or less by volume before cargo liquid or vapor is introduced.\n(b) Inert gas must be supplied from the shore or from the vessel's inert gas system.","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 E—Operations"],"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":"79e5b68dcd64583b06acc7d0d30aec5183026f12993d679f23738e8abe37b26e","source_id":"us-cfr","stale":true,"prev":"us/46-cfr-154.1846","next":"us/46-cfr-154.1850"},"notice":"GroundRules: Original legal text. Not legal advice."}