46 CFR § 56.04-2 - Piping classification according to service.
§ 56.04-2 Piping classification according to service.
The designation of classes according to service is found in table 56.04-2.
Table 56.04-2—Pressure Piping Classification
Service | Class 1 | Pressure (p.s.i.g.) | Temp. (°F) | |
---|---|---|---|---|
Class B and C poisons 2 | I | any | and | 0 and above. |
I-L | any | and | below 0. | |
II | ( 3 ) | ( 3 ) | ( 3 ) | |
II-L | ( 3 ) | ( 3 ) | ( 3 ) | |
Gases and vapors 2 | 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 2 | I | above 150 | and | 0 and above. 1 |
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 2 | 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. |
1 Where doubt exists as to proper classification, refer to the Commandant for resolution.
2 For definitions, see 46 CFR parts 30, 151, and 154. Note that the category “B and C” poisons is not used in the rules applying to self-propelled vessels (46 CFR part 153).
3 Not permitted except inside cargo tanks approved for Class B and C poisons.
[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]