{"data":{"id":"us/46-cfr-154.1872","jurisdiction":"us","citation":"46 CFR 154.1872","heading":"Cargo emergency jettisoning.","body":"(a) The master shall ensure that emergency jettisoning piping under § 154.356, except bow and stern loading and discharging piping, is only used when an emergency exists.\n(b) Emergency jettisoning piping when being used may be outside of the transverse tank location under § 154.310.\n(c) The master shall ensure that cargo is not jettisoned in a U.S. port.\n(d) When ethylene oxide is carried, the master shall ensure that the emergency jettisoning piping with associated pumps and fittings is on-line and ready for use for an emergency.\n(e) The master shall lock closed the shut-off valves under § 154.356 when the emergency jettisoning piping is not in use.\n(f) The person in charge of cargo transfer shall ensure that after the emergency jettisoning piping is used it is purged of cargo vapors with inert gas.\n(g) The person in charge of cargo transfer shall ensure that entrances, forced or natural ventilation intakes, exhausts, and other openings to accommodation, service, or control spaces facing the emergency jettisoning piping area and alongside the emergency jettisoning piping are closed when this piping is in use.\nTable 4—Summary of Minimum Requirements\nCargo name 1 Ship type Independent tank type C required Control of cargo tank vapor space Vapor detection 2 Gauging 3 Electrical hazard class and group 4 Special requirements\nAcetaldehyde IIG/IIPG Inert I \u0026 T C I-C 154.1410 (c), 154.1410, 154.1710, 154.1720, 154.1870.\nAmmonia, anhydrous IIG/IIPG T C I-D 154.1000, 154.1400 (c), 154.1405, 154.1410, 154.1702 (b), (c), (e), 154.1760, 154.1870.\nButadiene IIG/IIPG Inert I R I-B 154.1702 (b), (d), (f), 154.1710, 154.1750, 154.1818.\nButane IIG/IIPG I R I-D None.\nButylene IIG/IIPG I R I-D None.\nDimethylamine IIG/IIPG I \u0026 T C I-C 154.1400 (c), 154.1405, 154.1410, 154.1702 (b), (c), (e), 154.1870.\nEthane IIG I R I-D None.\nEthylamine IIG/IIPG I \u0026 T C I-C 154.1400 (c), 154.1405, 154.1410, 154.1702 (b), (c), (e), 154.1870.\nEthyl Chloride IIG/IIPG I \u0026 T R I-D 154.1870.\nEthylene IIG I R I-C None.\nEthylene oxide IG Yes Inert I \u0026 T C I-B 154.660 (b) (3), 154.1400 (c), 154.1405, 154.1410, 154.1702 (b), (d), (f), 154.1705, 154.1710, 154.1720, 154.1725, 154.1730, 154.1870 (a), (b).\nMethane (LNG) IIG I C I-D 154.703 through 154.709, 154.1854.\nMethyl acetylene-propadiene mixture IIG/IIPG I R I 154.1735.\nMethyl bromide IG Yes I \u0026 T C I-D 154.660 (b) (3), 154.1345 (c) (d), 154.1400 (c), 154.1405, 154.1410, 154.1702 (a), (d), 154.1705, 154.1720, 154.1870 (a), (b).\nMethyl chloride IIG/IIPG I \u0026 T C I-D 154.1702 (a), 154.1870.\nNitrogen IIIG O C 154.1755.\nPropane IIG/IIPG I R I-D None.\nPropylene IIG/IIPG I R I-D None.\nRefrigerant IIIG R None.\nSulfur dioxide IG Yes Dry T C 154.660 (b) (3), 154.1345 (c), (d), 154.1400 (c), 154.1405, 154.1410, 154.1705, 154.1715, 154.1720, 154.1870 (a), (b).\nVinyl chloride IIG/IIPG I \u0026 T C I-D 154.1405, 154.1410, 154.1702 (a) (b) (d) (f), 154.1710, 154.1740, 154.1745, 154.1750, 154.1818, 154.1830 (f), 154.1870.\n1 Refrigerant gases include non-toxic, non-flammable gases such as: dichlorodifluoromethane, dichloromonofluoromethane, dichlorotetrafluoroethane, monochlorodifluoromethane, monochlorotetrafluoroethane, and monochlorotrifluoromethane.\n2 As used in this column: “I” stands for flammable vapor detection; “T” stands for toxic vapor detection; “O” stands for oxygen detection; and see §§ 154.1345 thru 154.1360.\n3 As used in this column: “C” stands for closed gauging; “R” stands for restricted gauging; and see § 154.1300.\n4 The designations used in this column are from the National Electrical Code.","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":"cb16e89b94392c5bfdd793c27843c5ddd7e556f2c2049adcf13f8e53ddb14003","source_id":"us-cfr","stale":true,"prev":"us/46-cfr-154.1870","next":"us/46-cfr-appendix-a-to-part-154"},"notice":"GroundRules: Original legal text. Not legal advice."}