Piping is classified as shown in table 1 to § 56.04-1.
Table 1 to § 56.04-1—Piping Classifications
| Service
| Class
| Section in this part
|
|---|
| Normal | I, II | 56.04-2
|
| Low temperature | I-L, II-L | 56.50-105 |
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
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. |
| 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.
|
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]
authority: 33 U.S.C. 1321(j), 1509;
43 U.S.C. 1333;
46 U.S.C. 3306,
3703; E.O. 12234, 45 FR 58801, 3 CFR, 1980 Comp., p. 277; E.O. 12777, 56 FR 54757, 3 CFR, 1991 Comp., p. 351; DHS Delegation No. 00170.1, Revision No. 01.4
source: CGFR 68-82, 33 FR 18843, Dec. 18, 1968, unless otherwise noted.
cite as: 46 CFR 56.04-10