{"data":{"id":"us/46-cfr-56.04-2","jurisdiction":"us","citation":"46 CFR 56.04-2","heading":"-2 Piping classification according to service.","body":"The designation of classes according to service is found in table 1 to § 56.04-2.\nTable 1 to § 56.04-2—Pressure Piping Classification\nService Class 1 Pressure (p.s.i.g.) Temp. (°F)\nClass B and C poisons 2 I any and 0 and above.\nI-L any and below 0.\nII (3 ) (3 ) (3 )\nII-L (3 ) (3 ) (3 )\nGases and vapors 2 I above 150 or above 650.\nI-L above 150 and below 0.\nII 150 and below and 0 to 650.\nII-L 150 and below and below 0.\nLiquefied flammable gases 2 I above 150 and 0 and above. 1\nI-L above 150 and below 0.\nII 150 and below and 0 and above.\nII-L 150 and below and below 0.\nMolten sulphur I above 225 or above 330.\nII 225 and below and 330 and below.\nCargo liquids Grades A through D 2 I above 225 or above 150.\nI-L above 225 and below 0.\nII 225 and below and 0 to 150.\nII-L 225 and below and below 0.\nCargo liquids Grade E I above 225 or above 400.\nI-L above 225 and below 0.\nII 225 and below and 0 to 400.\nII-L 225 and below and below 0.\nWater I above 225 or above 350.\nII 225 and below and 350 and below.\nFuels (Bunker, diesel, gasoline, etc.) I above 150 or above 150.\nII 150 and below and 150 and below.\nLubricating oil I above 225 or above 400.\nII 225 and below and 400 and below.\nAsphalt I above 225 or above 400.\nII 225 and below and 400 and below.\nHeat transfer oil I above 225 or above 400.\nII 225 and below and 400 and below.\nHydraulic fluid I above 225 or above 400.\nII 225 and below and 400 and below.\nFlammable or combustible dangerous cargoes. Refer to specific requirements of part 40 of this chapter.\nOther dangerous cargoes. Refer to specific requirements of part 98 of this chapter.\n1 Where doubt exists as to proper classification, refer to the Commandant for resolution.\n2 For definitions, see parts 30, 151, and 154 of this chapter. Note that the category “B and C” poisons is not used in the rules applying to self-propelled vessels (part 153 of this chapter).\n3 Not permitted except inside cargo tanks approved for Class B and C poisons.","path":["Title 46—Shipping","CHAPTER I—COAST GUARD, DEPARTMENT OF HOMELAND SECURITY","SUBCHAPTER F—MARINE ENGINEERING","PART 56—PIPING SYSTEMS AND APPURTENANCES","Subpart 56.04—Piping Classification"],"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":"fc7f4cf56b713c2f5106e79412ddb8b5b3f70cc53c15f3f03fc10de293aa58a8","source_id":"us-cfr","stale":true,"prev":"us/46-cfr-56.04-1","next":"us/46-cfr-56.04-10"},"notice":"GroundRules: Original legal text. Not legal advice."}