###### Editorial Note on [Part 148](/current/title-46/part-148?toc=1)

#### Editorial Note:

Nomenclature changes to part 148 appear by USCG-2012-0832, [77 FR 59783](https://www.federalregister.gov/citation/77-FR-59783), Oct. 1, 2012.

#### § 148.120 Stowage and segregation requirements.

(a) Each material listed in Table 148.10 of this part must be segregated from incompatible materials in accordance with—

(1) The requirements of Tables [148.120](/on/2024-09-23/title-46/section-148.120)A and [148.120](/on/2024-09-23/title-46/section-148.120)B of this section that pertain to the primary or subsidiary hazard class to which the materials belong. Whenever a subsidiary hazard may exist, the most stringent segregation requirement applies; and

(2) Any specific requirements in [Subpart D of this part](/on/2024-09-23/title-46/part-148/subpart-D).

(b) Materials that are required to be separated during stowage must not be handled at the same time. Any residue from a material must be removed before a material required to be separated from it is loaded.

(c) Definitions and application of segregation terms:

(1) *“Separated from”* means located in different cargo compartments or holds when stowed under deck. If the intervening deck is resistant to fire and liquid, a vertical separation, i.e., in different cargo compartments, is acceptable as equivalent to this segregation.

(2) *“Separated by a complete cargo compartment or hold from”* means either a vertical or horizontal separation, for example, by a complete cargo compartment or hold. If the intervening decks are not resistant to fire and liquid, only horizontal separation is acceptable.

(3) *“Separated longitudinally by an intervening complete cargo compartment or hold from”* means that vertical separation alone does not meet this requirement.

Table [148.120](/on/2024-09-23/title-46/section-148.120)A—Segregation Between Incompatible Bulk Solid Cargoes

| Bulk solid materials | Class | 4.1 | 4.2 | 4.3 | 5.1 | 6.1 | 7 | 8 | 9/PDM |
| --- | --- | --- | --- | --- | --- | --- | --- | --- | --- |
| Flammable solid | 4.1 | X | | | | | | | |
| Spontaneously combustible material | 4.2 | 2 | X | | | | | | |
| Dangerous when wet material | 4.3 | 3 | 3 | X | | | | | |
| Oxidizer | 5.1 | 3 | 3 | 3 | X | | | | |
| Poisonous material | 6.1 | X | X | X | 2 | X | | | |
| Radioactive material | 7 | 2 | 2 | 2 | 2 | 2 | X | | |
| Corrosive material | 8 | 2 | 2 | 2 | 2 | X | X | X | |
| Miscellaneous hazardous material and potential dangerous material | 9/PDM | X | X | X | X | X | 2 | X | X |
| | | | | | | | | | |
| --- | --- | --- | --- | --- | --- | --- | --- | --- | --- |
| Numbers and symbols indicate the following terms as defined in [§ 148.3 of this part](/on/2024-09-23/title-46/part-148/section-148.3): | | | | | | | | | |
| 2—“Separated from”. | | | | | | | | | |
| 3—“Separated by a complete hold or compartment from”. | | | | | | | | | |
| X—No segregation required, except as specified in an applicable section of this subpart or [Subpart E of this part](/on/2024-09-23/title-46/part-148/subpart-E). | | | | | | | | | |

Table [148.120](/on/2024-09-23/title-46/section-148.120)B—Segregation Between Bulk Solid Cargoes and Incompatible Packaged Cargoes

| Packaged hazardous material | Bulk solid material | | | | | | | | |
| --- | --- | --- | --- | --- | --- | --- | --- | --- | --- |
| Class | 4.1 | 4.2 | 4.3 | 5.1 | 6.1 | 7 | 8 | 9/PDM |
| Explosives | 1.1 1.2 1.5 | 4 | 4 | 4 | 4 | 2 | 2 | 4 | X |
| Explosives | 1.3 1.6 | 3 | 3 | 4 | 4 | 2 | 2 | 2 | X |
| Explosives | 1.4 | 2 | 2 | 2 | 2 | X | 2 | 2 | X |
| Flammable gas | 2.1 | 2 | 2 | 1 | 2 | X | 2 | 2 | X |
| Non-flammable compressed gas | 2.2 | 2 | 2 | X | X | X | 2 | 1 | X |
| Poisonous gas | 2.3 | 2 | 2 | X | X | X | 2 | 1 | X |
| Flammable liquid | 3 | 2 | 2 | 2 | 2 | X | 2 | 1 | X |
| Flammable solid | 4.1 | X | 1 | X | 1 | X | 2 | 1 | X |
| Spontaneously combustible material | 4.2 | 1 | X | 1 | 2 | 1 | 2 | 1 | X |
| Dangerous when wet material | 4.3 | X | 1 | X | 2 | X | 2 | 1 | X |
| Oxidizer | 5.1 | 1 | 2 | 2 | X | 1 | 1 | 2 | X |
| Organic peroxide | 5.2 | 2 | 2 | 2 | 2 | 1 | 2 | 2 | X |
| Poisonous material | 6.1 | X | 1 | X | 1 | X | X | X | X |
| Infectious substance | 6.2 | 3 | 3 | 2 | 3 | 1 | 3 | 3 | X |
| Radioactive material | 7 | 2 | 2 | 2 | 1 | X | X | 2 | X |
| Corrosive material | 8 | 1 | 1 | 1 | 2 | X | 2 | X | X |
| Miscellaneous hazardous material | 9 | X | X | X | X | X | X | X | X |
| | | | | | | | | | |
| --- | --- | --- | --- | --- | --- | --- | --- | --- | --- |
| Numbers and symbols indicate the following terms as defined in [§ 148.3 of this part](/on/2024-09-23/title-46/part-148/section-148.3): | | | | | | | | | |
| 1—“Away from”. | | | | | | | | | |
| 2—“Separated from”. | | | | | | | | | |
| 3—“Separated by a complete hold or compartment from”. | | | | | | | | | |
| 4—“Separated longitudinally by an intervening complete compartment or hold from”. | | | | | | | | | |
| X—No segregation required, except as specified in an applicable section of this subpart or [Subpart E of this part](/on/2024-09-23/title-46/part-148/subpart-E). | | | | | | | | | |