{"data":{"id":"us/46-cfr-153.406","jurisdiction":"us","citation":"46 CFR 153.406","heading":"Standards for containment systems having required restricted gauges.","body":"When Table 1 requires a cargo's containment system to have a restricted gauge, the containment system must have:\n(a) A closed gauging system; or\n(b) A system that has:\n(1) A restricted gauge (e.g., a sounding tube) with an orifice diameter not exceeding 20 cm (approx. 7.8 in.);\n(2) A permanently attached gauge cover that is vapor tight when in place; and\n(3) A venting system that has either:\n(i) Lock open PV valves; or\n(ii) Valved bypasses around the PV valves.","path":["Title 46—Shipping","CHAPTER I—COAST GUARD, DEPARTMENT OF HOMELAND SECURITY","SUBCHAPTER O—CERTAIN BULK DANGEROUS CARGOES","PART 153—SHIPS CARRYING BULK LIQUID, LIQUEFIED GAS, OR COMPRESSED GAS HAZARDOUS MATERIALS","Subpart B—Design 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":"0421a1950d525a434b0385fbdf49adaa546976ddd82b8b368011bae9a8ea9ae9","source_id":"us-cfr","stale":true,"prev":"us/46-cfr-153.404","next":"us/46-cfr-153.407"},"notice":"GroundRules: Original legal text. Not legal advice."}