The designation of classes according to service is found in table 1 to § 56.04-2. Table 1 to § 56.04-2—Pressure Piping Classification Service | Class | Pressure (p.s.i.g.) | | Temp. (°F) Class B and C poisons | I | any | and | 0 and above. | I-L | any | and | below 0. | II | () | () | () | II-L | () | () | () Gases and vapors | I | above 150 | or | above 650. | I-L | above 150 | and | below 0. | II | 150 and below | and | 0 to 650. | II-L | 150 and below | and | below 0. Liquefied flammable gases | I | above 150 | and | 0 and above. | I-L | above 150 | and | below 0. | II | 150 and below | and | 0 and above. | II-L | 150 and below | and | below 0. Molten sulphur | I | above 225 | or | above 330. | II | 225 and below | and | 330 and below. Cargo liquids Grades A through D | I | above 225 | or | above 150. | I-L | above 225 | and | below 0. | II | 225 and below | and | 0 to 150. | II-L | 225 and below | and | below 0. Cargo liquids Grade E | I | above 225 | or | above 400. | I-L | above 225 | and | below 0. | II | 225 and below | and | 0 to 400. | II-L | 225 and below | and | below 0. Water | I | above 225 | or | above 350. | II | 225 and below | and | 350 and below. Fuels (Bunker, diesel, gasoline, etc.) | I | above 150 | or | above 150. | II | 150 and below | and | 150 and below. Lubricating oil | I | above 225 | or | above 400. | II | 225 and below | and | 400 and below. Asphalt | I | above 225 | or | above 400. | II | 225 and below | and | 400 and below. Heat transfer oil | I | above 225 | or | above 400. | II | 225 and below | and | 400 and below. Hydraulic fluid | I | above 225 | or | above 400. | II | 225 and below | and | 400 and below. Flammable or combustible dangerous cargoes. | Refer to specific requirements of part 40 of this chapter. Other dangerous cargoes. | Refer to specific requirements of part 98 of this chapter. [CGFR 68-82, 33 FR 18843, Dec. 18, 1968, as amended by CGD 73-254, 40 FR 40164, Sept. 2, 1975; CGD 73-96, 42 FR 49024, Sept. 26, 1977; USCG-2020-0634, 89 FR 50131, June 12, 2024]
TL;DR
The designation of classes according to service is found in table 1 to § 56.04-2.
Section 56.04-2 — full text
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