46 C.F.R. Subpart 56.04—Piping Classification
Title 46 - Shipping
Title 46: Shipping
PART 56—PIPING SYSTEMS AND APPURTENANCES
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Subpart 56.04—Piping Classification
§ 56.04-1 Scope.
Piping shall be classified as shown in Table 56.04–1.
Table 56.04-1_Piping Classifications------------------------------------------------------------------------ Section in Service Class this part------------------------------------------------------------------------Normal.............................. I, II................. 56.04-2Low temperature..................... I-L, II-L............. 56.50-105------------------------------------------------------------------------
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[CGD 72–206R, 38 FR 17229, June 29, 1973, as amended by CGD 77–140, 54 FR 40602, Oct. 2, 1989; CGD 95–012, 60 FR 48049, Sept. 18, 1995] § 56.04-2 Piping classification according to service.
The designation of classes according to service is found in Table 56.04–2.
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Table 56.04-2_Pressure Piping Classification---------------------------------------------------------------------------------------------------------------- Pressure Service Class \1\ (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 I................. above 225......... or................ above 150. \2\. 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, I................. above 150......... or................ above 150. etc.). 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 Refer to specific requirements of part 40 of combustible this chapter. dangerous cargoes.Other dangerous Refer to specific requirements of part 98 of cargoes. this chapter.---------------------------------------------------------------------------------------------------------------- \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.
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[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] § 56.04-10 Other systems.
Piping systems and appurtenances not requiring plan approval may be accepted by the marine inspector if:
(a) The system is suitable for the service intended,
(b) There are guards, shields, insulation and similar devices where needed for protection of personnel,
(c) Failure of the systems would not hazard the vessel, personnel or vital systems, and
(d) The system is not manifestly unsafe.
[CGD 77–140, 54 FR 40602, Oct. 2, 1989]
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