{"data":{"id":"us/46-cfr-154.1710","jurisdiction":"us","citation":"46 CFR 154.1710","heading":"Exclusion of air from cargo tank vapor spaces.","body":"When a vessel is carrying acetaldehyde, butadiene, ethylene oxide, or vinyl chloride, the master shall ensure that air is:\n(a) Purged from the cargo tanks and associated piping before the cargo is loaded; and\n(b) Excluded after the cargo is loaded by maintaining a positive pressure of at least 13.8 kPa gauge (2 psig) by:\n(1) Introducing a gas that:\n(i) Is not reactive;\n(ii) Is not flammable; and\n(iii) Does not contain more than 0.2% oxygen by volume; or\n(2) Controlling the cargo temperature.","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 D—Special Design and Operating Requirements"],"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":"2fc3741abba7873e4ad3ebe3dcd61f20c22f2bcfd9116f58531db5742c9867ce","source_id":"us-cfr","stale":true,"prev":"us/46-cfr-154.1705","next":"us/46-cfr-154.1715"},"notice":"GroundRules: Original legal text. Not legal advice."}