Section

[Code of Federal Regulations]

[Title 49, Volume 2]

[Revised as of October 1, 2005]

From the U.S. Government Printing Office via GPO Access

[CITE: 49CFR176.83]

[Page 735-744]

TITLE 49--TRANSPORTATION

CHAPTER I--PIPELINE AND HAZARDOUS MATERIALS SAFETY ADMINISTRATION,

DEPARTMENT OF TRANSPORTATION

PART 176_CARRIAGE BY VESSEL--Table of Contents

Subpart D_General Segregation Requirements

Sec. 176.83 Segregation.

(a) General. (1) The requirements of this section apply to all cargo

spaces on deck or under deck of all types of vessels, and to all cargo

transport units.

(2) Segregation is obtained by maintaining certain distances between

incompatible hazardous materials or by requiring the presence of one or

more steel bulkheads or decks between them or a combination thereof.

Intervening spaces between such hazardous materials may be filled with

other cargo which is not incompatible with the hazardous materials.

(3) The general requirements for segregation between the various

classes of dangerous goods are shown in the segregation table. In

addition to these general requirements, there may be a need to segregate

a particular material from other materials which would contribute to its

hazard. Such segregation requirements are indicated by code numbers in

Column 10B of the Sec. 172.101 Table.

(4) Segregation is not required between hazardous materials of

different classes which comprise the same substance but vary only in

their water

[[Page 736]]

content (e.g., sodium sulphide in Division 4.2 or Class 8).

(5) Whenever hazardous materials are stowed together, whether or not

in a cargo transport unit, the segregation of such hazardous materials

from others must always be in accordance with the most restrictive

requirements for any of the hazardous materials concerned.

(6) When the Sec. 172.101 Table or Sec. 172.402 requires packages

to bear a subsidiary hazard label or labels, the segregation appropriate

to the subsidiary hazards must be applied when that segregation is more

restrictive than that required by the primary hazard. For the purposes

of this paragraph, the segregation requirements corresponding to an

explosive subsidiary hazard are--except for organic peroxides which are

those corresponding to Division 1.3--those for Division 1.4 (explosive)

materials.

(7) Where, for the purposes of segregation, terms such as ``away

from'' a particular hazard class are used in the Sec. 172.101 Table,

the segregation requirement applies to:

(i) All hazardous materials within the hazard class; and

(ii) All hazardous materials for which a secondary hazard label of

that class is required.

(8) Notwithstanding the requirements of paragraphs (a)(6) and (a)(7)

of this section, hazardous materials of the same class may be stowed

together without regard to segregation required by secondary hazards

(subsidiary risk label(s)), provided the substances do not react

dangerously with each other and cause:

(i) Combustion and/or evolution of considerable heat;

(ii) Evolution of flammable, toxic or asphyxiant gases;

(iii) The formation of corrosive substances; or

(iv) The formation of unstable substances.

(9) Stowage in a shelter-'tween deck cargo space is not considered

to be ``on deck'' stowage.

(10) Where the code in column (10B) of the Sec. 172.101 Table

specifies that ``Segregation as for. . .'' applies, the segregation

requirements applicable to that class in the Sec. 176.83(b) General

Segregation Table must be applied. However, for the purposes of

paragraph (a)(8) of this section, which permits substances of the same

class to be stowed together provided they do not react dangerously with

each other, the segregation requirements of the class as represented by

the primary hazard class in the Sec. 172.101 Table entry must be

applied.

(11) Certain exceptions from segregation for waste cyanides or waste

cyanide mixtures or solutions transported with acids and waste Division

4.2 materials transported with Class 8 liquids are set forth in Sec.

173.12(e) of this subchapter.

(b) General Segregation Table. The following table sets forth the

general requirements for segregation between the various classes of

hazardous materials. The properties of materials within each class may

vary greatly and may require greater segregation than is reflected in

this table. If the Sec. 172.101 Table sets forth particular

requirements for segregation, they take precedence over these general

requirements.

Table 176.83(b)--General Segregation Requirements for Hazardous Materials

[Segregation must also take account of a single secondary hazard label, as required by paragraph (a)(6) of this section.]

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1.1

Class 1.2 1.3 1.4 2.1 2.2 2.3 3 4.1 4.2 4.3 5.1 5.2 6.1 6.2 7 8 9

1.5 1.6

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Explosives, 1.1, 1.2, 1.5.......................................... (*) (*) (*) 4 2 2 4 4 4 4 4 4 2 4 2 4 X

Explosives, 1.3.................................................... (*) (*) (*) 4 2 2 4 3 3 4 4 4 2 4 2 2 X

Explosives, 1.4, 1.6............................................... (*) (*) (*) 2 1 1 2 2 2 2 2 2 X 4 2 2 X

Flammable gases 2.1................................................ 4 4 2 X X X 2 1 2 X 2 2 X 4 2 1 X

Non-toxic, non-flammable gases 2.2................................. 2 2 1 X X X 1 X 1 X X 1 X 2 1 X X

Poisonous gases 2.3................................................ 2 2 1 X X X 2 X 2 X X 2 X 2 1 X X

Flammable liquids 3................................................ 4 4 2 2 1 2 X X 2 1 2 2 X 3 2 X X

Flammable solids 4.1............................................... 4 3 2 1 X X X X 1 X 1 2 X 3 2 1 X

[[Page 737]]

Spontaneously combustible substances 4.2........................... 4 3 2 2 1 2 2 1 X 1 2 2 1 3 2 1 X

Substances which are dangerous when wet 4.3........................ 4 4 2 X X X 1 X 1 X 2 2 X 2 2 1 X

Oxidizing substances 5.1........................................... 4 4 2 2 X X 2 1 2 2 X 2 1 3 1 2 X

Organic peroxides 5.2.............................................. 4 4 2 2 1 2 2 2 2 2 2 X 1 3 2 2 X

Poisons 6.1........................................................ 2 2 X X X X X X 1 X 1 1 X 1 X X X

Infectious substances 6.2.......................................... 4 4 4 4 2 2 3 3 3 2 3 3 1 X 3 3 X

Radioactive materials 7............................................ 2 2 2 2 1 1 2 2 2 2 1 2 X 3 X 2 X

Corrosives 8....................................................... 4 2 2 1 X X X 1 1 1 2 2 X 3 2 X X

Miscellaneous dangerous substances 9............................... X X X X X X X X X X X X X X X X X

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Numbers and symbols relate to the following terms as defined in this section:

1--``Away from.''

2--``Separated from.''

3--``Separated by a complete compartment or hold from.''

4--``Separated longitudinally by an intervening complete compartment or hold from.''

X--The segregation, if any, is shown in the Sec. 172.101 table.

*--See Sec. 176.144 of this part for segregation within Class 1.

requirements of this paragraph apply to the segregation of packages

containing hazardous materials and stowed as breakbulk cargo;

(2) Definition of the segregation terms:

(i) Legend:

(A) Package containing incompatible goods.

[GRAPHIC] [TIFF OMITTED] TC02MR91.070

(B) Reference package.

[GRAPHIC] [TIFF OMITTED] TC02MR91.071

[GRAPHIC] [TIFF OMITTED] TC02MR91.072

Note: Full vertical lines represent transverse bulkheads between

compartments or holds resistant to fire and liquid.

[[Page 738]]

(ii) ``Away from'': Effectively segregated so that the incompatible

materials cannot interact dangerously in the event of an accident but

may be carried in the same compartment or hold or on deck provided a

minimum horizontal separation of 3 m (10 feet) projected vertically is

obtained.

[GRAPHIC] [TIFF OMITTED] TC02MR91.073

(iii) ``Separated From'': In different compartments or holds when

stowed under deck. If the intervening deck is resistant to fire and

liquid, a vertical separation (i.e., in different compartments) is

acceptable as equivalent to this segregation. For ``on deck'' stowage,

this segregation means a separation by a distance of at least 6 m (20

feet) horizontally.

[GRAPHIC] [TIFF OMITTED] TC02MR91.091

(iv) ``Separated by a complete compartment or hold from'': Either a

vertical or horizontal separation. If the intervening decks are not

resistant to fire and liquid, then only a longitudinal separation (i.e.,

by a intervening complete compartment or hold) is acceptable. For ``on

deck'' stowage, this segregation means a separation by a distance of at

least 12 m (39 feet) horizontally. The same distance must be applied if

one package is stowed ``on deck'', and the other one in an upper

compartment.

[GRAPHIC] [TIFF OMITTED] TC02MR91.074

Note: One of the two decks must be resistant to fire and liquid.

(v) ``Separated longitudinally by an intervening complete

compartment or hold from'': Vertical separation alone does not meet this

requirement. Between a package ``under deck'' and one ``on deck'' a

minimum distance of 24 m (79 feet) including a complete compartment must

be maintained longitudinally. For ``on deck'' stowage, this

[[Page 739]]

segregation means a separation by a distance of at least 24 m (79 feet)

longitudinally.

[GRAPHIC] [TIFF OMITTED] TC02MR91.075

(d) Segregation in cargo transport units: Two hazardous materials

for which any segregation is required may not be stowed in the same

cargo transport unit.

(e) Segregation of hazardous materials stowed as breakbulk cargo

from those packed in cargo transport units: (1) Hazardous materials

stowed as breakbulk cargo must be segregated from materials packed in

open cargo transport units in accordance with paragraph (c) of this

section.

(2) Hazardous materials stowed as breakbulk cargo must be segregated

from materials packed in closed cargo transport units in accordance with

paragraph (c) of this section, except that:

(i) Where ``away from'' is required, no segregation between packages

and the closed cargo transport units is required; and

(ii) Where ``separated from'' is required, the segregation between

the packages and the closed cargo transport units may be the same as for

``away from''.

(f) Segregation of cargo transport units on board container vessels:

(1) Except for hatchless container ships, this paragraph applies to

segregation of cargo transport units that are carried on board container

vessels, or on other types of vessels, provided these cargo spaces are

properly fitted for permanent stowage of containers during transport.

(2) For container vessels which have cargo spaces used for breakbulk

cargo or any other method of stowage, the appropriate paragraph of this

section applies to the relevant cargo space.

(3) Segregation Table. Table Sec. 176.83(f) sets forth the general

requirements for segregation between cargo transport units on board

container vessels.

(4) In table Sec. 176.83(f), a container space means a distance of

not less than 6 m (20 feet) fore and aft or not less than 2.5 m (8 feet)

athwartship.

[[Page 740]]

Table 176.83(f)--Segregation of Containers on Board Container Ships

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Vertical Horizontal

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Segregation requirement Closed versus closed Closed versus open Open versus open

Closed versus Closed versus open Open versus open -----------------------------------------------------------------------------------------------------------------------

closed On deck Under deck On deck Under deck On deck Under deck

1. ``Away from''................ One on top of the Open on top of Not in the same Fore and aft...... No restriction.... No restriction.... No restriction.... No restriction.... One container One container

other permitted. closed permitted. vertical line .................. .................. .................. .................. .................. space. space or one

.................. unless segregated .................. .................. .................. .................. .................. .................. bulkhead.

.................. by a deck. .................. .................. .................. .................. .................. One container One container

Otherwise as for Athwartships...... No restriction.... No restriction.... No restriction.... No restriction.... space. space.

open versus open. ..................

..................

2. ``Separated from''........... Not in the same As for open versus Not in the same Fore and aft...... One container One container One container One container One container One bulkhead.

vertical line open. vertical line .................. space. space or one space. space or one space.. ..................

unless segregated unless segregated .................. .................. bulkhead. .................. bulkhead. .................. ..................

by a deck. by a deck. .................. One container One container One container Two container Two container One bulkhead.

Athwartships...... space. space. space. spaces. spaces..

3. ``Separated by a complete Not in the same As for open versus Not in the same Fore and aft...... One container One bulkhead...... One container One bulkhead...... Two container Two bulkheads.

compartment or hold from''. vertical line open. vertical line .................. space. .................. space. .................. spaces. ..................

unless segregated unless segregated .................. Two container .................. Two container .................. Three container Two bulkheads.

by a deck. by a deck. Athwartships...... spaces. One bulkhead...... spaces. One bulkhead...... spaces.

..................

4. ``Separated longitudinally by Prohibited........ .................. .................. Fore and aft...... Four container One bulkhead and Four container Two bulkheads..... Four container Two bulkheads.

an intervening complete .................. spaces. four container spaces. .................. spaces. ..................

compartment or hold from''. .................. .................. spaces*. .................. .................. .................. ..................

.................. Prohibited........ Prohibited........ Prohibited........ Prohibited........ Prohibited........ Prohibited.

Athwartships......

* Containers not less than 6 m (20 feet) from intervening bulkhead.

Note: All bulkheads and decks must be resistant to fire and liquid.

[[Page 741]]

(g) Segregation of cargo transport units on board trailerships and

trainships: (1) The requirements of this paragraph apply to the

segregation of cargo transport units which are carried on board

trailerships and trainships or in ``roll-on/roll-off'' cargo spaces.

(2) For trailerships and trainships which have spaces suitable for

breakbulk cargo, containers, or any other method of stowage, the

appropriate paragraph of this section applies to the relevant cargo

space.

(3) Segregation Table. Table Sec. 176.83(g) sets forth the general

requirements for segregation between transport units on board

trailerships and trainships.

Table 176.83(g)--Segregation of Cargo Transport Units on Board Trailerships and Trainships.

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Segregation requirement Closed versus closed Closed versus open Open versus open

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On deck Under deck On deck Under deck On deck Under deck

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1. ``Away From''............. Fore and aft.... No restriction.. No restriction.. No restriction.. No restriction. At least 3 m... At least 3 m.

Athwartships.... No restriction.. No restriction.. No restriction.. No restriction. At least 3 m... At least 3 m.

2. ``Separated from''........ Fore and aft.... At least 6 m.... At least 6 m or At least 6 m.... At least 6 m or At least 6 m... At least 12 m

................ ................ one bulkhead. ................ one bulkhead. At least 6 m... or one

................ At least 3 m.... At least 3 m or At least 3 m.... At least 6 m or bulkhead

Athwartships.... one bulkhead. one bulkhead. At least 12 m

or one

bulkhead

3. ``Separated by a complete Fore and aft.... At least 12 m... At least 24 m + At least 24 m... At least 24 m + At least 36 m.. Two decks or

compartment or hold from''. ................ ................ deck. ................ deck. ............... two bulkheads.

................ At least 12 m... ................ At least 24 m... ............... At least 36 m.. ...............

Athwartships.... At least 24 m + At least 24 m + Prohibited.

deck. deck.

4. ``Separated longitudinally Fore and aft.... At least 36 m... Two bulkheads or At least 36 m... At least 48 m At least 48 m.. Prohibited.

by an intervening complete ................ ................ at least 36 m + ................ including two ............... ...............

compartment or hold from''. ................ ................ two decks. ................ bulkheads. ............... ...............

................ Prohibited...... Prohibited...... Prohibited...... Prohibited..... Prohibited..... ...............

Athwartships.... Prohibited.

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Note: All bulkheads and decks must be resistant to fire and liquid.

(h) Segregation on board barge carrying vessels: (1) The

requirements of this section apply to the segregation in shipborne

barges as well as to the segregation between shipborne barges carried on

board vessels specially designed and equipped to carry such barges.

(2) On barge-carrying vessels which incorporate other stowage spaces

or any other method of stowage, barges containing hazardous materials

must be segregated from hazardous materials not stowed in barges as

prescribed in paragraphs (b) and (j) of this section.

(i) Segregation in shipborne barges: Hazardous materials transported

in shipborne barges must be segregated as prescribed in paragraphs (a),

(b), and (c) of this section.

(j) Segregation between shipborne barges on barge-carrying vessels:

(1) When a shipborne barge is loaded with two or more hazardous

materials with different requirements for segregation, the most

stringent applicable segregation requirement must be applied.

(2) ``Away from'' and ``separated from'' require no segregation

between shipborne barges.

(3) For barge-carrying vessels with vertical holds, ``Separated by a

complete compartment or hold from'' means that separate holds are

required. On barge-carrying vessels having horizontal barge levels,

separate barge levels are required and the barges may not be in the same

vertical line.

(4) ``Separated longitudinally by an intervening complete

compartment or hold from'' means, for barge-carrying vessels with

vertical holds, that separation by an intervening hold or engine room is

required. On barge-carrying vessels having horizontal barge levels,

separate barge levels and a longitudinal separation by at least two

intervening barge spaces are required.

[[Page 742]]

(k) Segregation requirements for ferry vessels: A ferry vessel (when

operating either as a passenger or cargo vessel) that cannot provide the

separation required in this section may carry incompatible hazardous

materials in separate transport vehicles if they are stowed to give the

maximum possible separation.

(l) Segregation of containers on board hatchless (open-top)

container ships: (1) This paragraph applies to the segregation of cargo

transport units that are transported on board hatchless container ships

provided that the cargo spaces are properly fitted to give permanent

stowage of the cargo transport units during transport.

(2) For container ships that have both hatchless container spaces

and other spaces suitable for breakbulk cargo, conventional container

stowage, or any other method of stowage, the appropriate requirements of

this section apply to the relevant cargo space.

(3) Segregation Table. Table Sec. 176.83(l)(3) sets forth the

general requirements for segregation of cargo transport units on board

hatchless container ships.

(4) In Table Sec. 176.83(l)(3), a container space means a distance

of not less than 6 m (20 feet) fore and aft or not less than 2.5 m (8

feet) athwartship.

[[Page 743]]

Table 176.83(f)--Segregation of Containers on Board Container Ships

Vertical Horizontal

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Segregation requirement Closed versus closed Closed versus open Open versus open

Closed versus Closed versus open Open versus open -----------------------------------------------------------------------------------------------------------------------

closed On deck Under deck On deck Under deck On deck Under deck

``Away from''................... One on top of the Open on top of .................. Fore and AFT...... No restriction.... No restriction.... No restriction.... No restriction.... One container One container

1............................... other permitted. closed permitted. space. space or one

bulkhead

.................. Otherwise as for .................. Athwart-ships..... No restriction.... No restriction.... No restriction.... No restriction.... One container One container

``Open versus space. space

open''.

``Separated from''.............. .................. .................. Not in the same Fore and AFT...... One container One container One container one container One container One bulkhead

2............................... vertical line. space. space or one space. space or one space and not in

bulkhead. bulkhead. or above same

hold.

Not in the same As for ``open .................. Athwart-ships..... One container One container Two container Two container Two container One bulkhead

vertical line. versus open''. space. space. spaces. spaces. spaces and not in

or above same

hold.

``Separated by a complete .................. .................. .................. Fore and AFT...... One container One bulkhead...... One container One bulkhead...... Two container Two bulkheads

compartment or hold from''. space and not in space and not in spaces and not in

3............................... or above same or above same or above same

hold. hold. hold.

.................. .................. .................. Athwart-ships..... Two container One bulkhead...... Two container One bulkhead...... Three container Two bulkheads

spaces and not in spaces and not in spaces and not in

or above same or above same or above same

hold. hold. hold.

``Separated longitudinally by an Prohibited........ Fore and AFT...... Minimum horizontal One bulkhead and Minimum horizontal Two bulkheads..... Minimum horizontal Two bulkheads.....

intervening complete distance of 24 m minimum distance of 24 m distance of 24 m

compartment or hold from''. and not in or horizontal and not in or and not in or

4............................... above same hold. distance of 24 M*. above same hold. above same hold.

.................. Athwart-ships..... Prohibited........ Prohibited........ Prohibited........ Prohibited........ Prohibited........ Prohibited........

*Containers not less than 6 m (20 feet) from intervening bulkhead.

Note: All bulkheads and decks must be resistant to fire and liquid.

[[Page 744]]

(m) Provisions for segregation groups: (1) For the purpose of

segregation, materials having certain similar chemical properties have

been grouped together in segregation groups. The segregation groups (

such as ``acids'', ``chlorates'', ``permanganates'') and the entries

allocated to each of these groups include the substances identified in

section 3.1.4 of the IMDG Code. When column (10B) of the Sec. 172.101

Table refers to a numbered stowage provision set forth in Sec.

176.84(b) such as ``Stow `away from' acids'', that particular stowage/

segregation requirement applies to all the materials allocated to the

respective segregation group.

(2) Not all hazardous materials falling within a segregation group

are listed by name in the regulations. These materials are shipped under

``n.o.s.'' entries. Although these ``n.o.s.'' entries are not listed

themselves in the above groups, the shipper must decide whether

allocation under a segregation group is appropriate. Mixtures, solutions

or preparations containing hazardous materials falling within a

segregation group and shipped under an ``n.o.s.'' entry are also

considered to fall within that segregation group.

(3) The segregation groups described above do not address materials

which fall outside the classification criteria of the hazardous

materials regulations although it is recognized that some non-hazardous

materials have certain chemical properties similar to hazardous

materials listed in the segregation groups. A shipper or the person

responsible for packing the materials into a cargo transport unit who

does have knowledge of the chemical properties of such non-hazardous

materials may identify a relevant segregation group and apply the

segregation requirements for that segregation group.

[Amdt. 176-30, 55 FR 52690, Dec. 21, 1990, as amended at 56 FR 66282,

Dec. 20, 1991; 57 FR 45465, Oct. 1, 1992; Amdt. 176-34, 58 FR 51533,

Oct. 1, 1993; Amdt. 176-38, 60 FR 49111, Sept. 21, 1995; 64 FR 10781,

10782, Mar. 5, 1999; 66 FR 45184, 45384, Aug. 28, 2001; 68 FR 45039,

July 31, 2003; 69 FR 76180, Dec. 20, 2004; 70 FR 3310, Jan. 24, 2005; 70

FR 34399, June 14, 2005]