###### Editorial Note on [Part 154](/current/title-46/part-154?toc=1)

#### Editorial Note:

Nomenclature changes to part 154 appear part 154 appear by CGD-95-072, [60 FR 50466](https://www.federalregister.gov/citation/60-FR-50466), Sept. 29, 1995, CGD-96-041, [61 FR 50732](https://www.federalregister.gov/citation/61-FR-50732), Sept. 27, 1996, USCG-2009-0702, [74 FR 49235](https://www.federalregister.gov/citation/74-FR-49235), Sept. 25, 2009, and USCG-2012-0832, [77 FR 59785](https://www.federalregister.gov/citation/77-FR-59785), Oct. 1, 2012.

#### § 154.1872 Cargo emergency jettisoning.

(a) The master shall ensure that emergency jettisoning piping under [§ 154.356](/on/2024-09-23/title-46/section-154.356), except bow and stern loading and discharging piping, is only used when an emergency exists.

(b) Emergency jettisoning piping when being used may be outside of the transverse tank location under [§ 154.310](/on/2024-09-23/title-46/section-154.310).

(c) The master shall ensure that cargo is not jettisoned in a U.S. port.

(d) When ethylene oxide is carried, the master shall ensure that the emergency jettisoning piping with associated pumps and fittings is on-line and ready for use for an emergency.

(e) The master shall lock closed the shut-off valves under [§ 154.356](/on/2024-09-23/title-46/section-154.356) when the emergency jettisoning piping is not in use.

(f) The person in charge of cargo transfer shall ensure that after the emergency jettisoning piping is used it is purged of cargo vapors with inert gas.

(g) The person in charge of cargo transfer shall ensure that entrances, forced or natural ventilation intakes, exhausts, and other openings to accommodation, service, or control spaces facing the emergency jettisoning piping area and alongside the emergency jettisoning piping are closed when this piping is in use.

Table 4—Summary of Minimum Requirements

| Cargo name1 | Ship type | Independent tank type C required | Control of cargo tank vapor space | Vapor detection2 | Gauging3 | Electrical hazard class and group4 | Special requirements |
| --- | --- | --- | --- | --- | --- | --- | --- |
| Acetaldehyde | IIG/IIPG | | Inert | I & T | C | I-C | 154.1410 (c), 154.1410, 154.1710, 154.1720, 154.1870. |
| Ammonia, anhydrous | IIG/IIPG | | | T | C | I-D | 154.1000, 154.1400 (c), 154.1405, 154.1410, 154.1702 (b), (c), (e), 154.1760, 154.1870. |
| Butadiene | IIG/IIPG | | Inert | I | R | I-B | 154.1702 (b), (d), (f), 154.1710, 154.1750, 154.1818. |
| Butane | IIG/IIPG | | | I | R | I-D | None. |
| Butylene | IIG/IIPG | | | I | R | I-D | None. |
| Dimethylamine | IIG/IIPG | | | I & T | C | I-C | 154.1400 (c), 154.1405, 154.1410, 154.1702 (b), (c), (e), 154.1870. |
| Ethane | IIG | | | I | R | I-D | None. |
| Ethylamine | IIG/IIPG | | | I & T | C | I-C | 154.1400 (c), 154.1405, 154.1410, 154.1702 (b), (c), (e), 154.1870. |
| Ethyl Chloride | IIG/IIPG | | | I & T | R | I-D | 154.1870. |
| Ethylene | IIG | | | I | R | I-C | None. |
| Ethylene oxide | IG | Yes | Inert | I & T | C | I-B | 154.660 (b) (3), 154.1400 (c), 154.1405, 154.1410, 154.1702 (b), (d), (f), 154.1705, 154.1710, 154.1720, 154.1725, 154.1730, 154.1870 (a), (b). |
| Methane (LNG) | IIG | | | I | C | I-D | 154.703 through 154.709, 154.1854. |
| Methyl acetylene-propadiene mixture | IIG/IIPG | | | I | R | I | 154.1735. |
| Methyl bromide | IG | Yes | | I & T | C | I-D | 154.660 (b) (3), 154.1345 (c) (d), 154.1400 (c), 154.1405, 154.1410, 154.1702 (a), (d), 154.1705, 154.1720, 154.1870 (a), (b). |
| Methyl chloride | IIG/IIPG | | | I & T | C | I-D | 154.1702 (a), 154.1870. |
| Nitrogen | IIIG | | | O | C | | 154.1755. |
| Propane | IIG/IIPG | | | I | R | I-D | None. |
| Propylene | IIG/IIPG | | | I | R | I-D | None. |
| Refrigerant | IIIG | | | | R | | None. |
| Sulfur dioxide | IG | Yes | Dry | T | C | | 154.660 (b) (3), 154.1345 (c), (d), 154.1400 (c), 154.1405, 154.1410, 154.1705, 154.1715, 154.1720, 154.1870 (a), (b). |
| Vinyl chloride | IIG/IIPG | | | I & T | C | I-D | 154.1405, 154.1410, 154.1702 (a) (b) (d) (f), 154.1710, 154.1740, 154.1745, 154.1750, 154.1818, 154.1830 (f), 154.1870. |
| | | | | | | | |
| --- | --- | --- | --- | --- | --- | --- | --- |
| 1 Refrigerant gases include non-toxic, non-flammable gases such as: dichlorodifluoromethane, dichloromonofluoromethane, dichlorotetrafluoroethane, monochlorodifluoromethane, monochlorotetrafluoroethane, and monochlorotrifluoromethane. | | | | | | | |
| 2 As used in this column: “I” stands for flammable vapor detection; “T” stands for toxic vapor detection; “O” stands for oxygen detection; and see [§§ 154.1345](/on/2024-09-23/title-46/section-154.1345) thru 154.1360. | | | | | | | |
| 3 As used in this column: “C” stands for closed gauging; “R” stands for restricted gauging; and see [§ 154.1300](/on/2024-09-23/title-46/section-154.1300). | | | | | | | |
| 4 The designations used in this column are from the National Electrical Code. | | | | | | | |

[CGD 74-289, [44 FR 26009](https://www.federalregister.gov/citation/44-FR-26009), May 3, 1979; [44 FR 59234](https://www.federalregister.gov/citation/44-FR-59234), Oct. 15, 1979]