Each flexible bulk container manufactured and intended for use according to the provisions of ADR
shall bear marks that are durable, legible and placed in a location so as to be readily visible. Letters,
numerals and symbols shall be at least 24 mm high and shall show:
(a) The United Nations packaging symbol ; 
This symbol shall not be used for any purpose other than certifying that a packaging, a
flexible bulk container, a portable tank or a MEGC complies with the relevant requirements
in Chapters 6.1, 6.2, 6.3, 6.5, 6.6, 6.7 or 6.11;
(b) The code BK3;
(c) A capital letter designating the packing group(s) for which the design type has been
Z for packing group III only;
(d) The month and year (last two digits) of manufacture;
(e) The character(s) identifying the country authorizing the allocation of the mark; as indicated
by the distinguishing sign used on vehicles in international road traffic1;
(f) The name or symbol of the manufacturer and other identification of the flexible bulk
container as specified by the competent authority;
(g) The stacking test load in kg;
(h) The maximum permissible gross mass in kg.
Marks shall be applied in the sequence shown in (a) to (h); each mark, required in these
subparagraphs, shall be clearly separated, e.g. by a slash or space and presented in a way that ensures
that all of the parts of the mark are easily identified.
1 Distinguishing sign of the State of registration used on motor vehicles and trailers in international road traffic,
e.g. in accordance with the Geneva Convention on Road Traffic of 1949 or the Vienna Convention on Road Traffic of



NOTE 1: For portable tanks, see Chapter 6.7; for fixed tanks (tank-vehicles), demountable tanks, tankcontainers
and tank swap bodies, with shells made of metallic materials, see Chapter 6.8; for fibrereinforced
plastics tanks see Chapter 6.9; for vacuum operated waste tanks see Chapter 6.10; for bulk
containers see Chapter 6.11.
NOTE 2: This Chapter applies to fixed tanks, demountable tanks, tank-containers, tank swap bodies, which do
not comply with all requirements of the Chapters mentioned in Note 1 as well as bulk containers and
special compartments for explosives.


The requirements of this Chapter are applicable to tanks, bulk containers and special compartments
intended for the carriage of dangerous goods on MEMUs.

General provisions

Tanks shall meet the requirements of Chapter 6.8, notwithstanding the minimum capacity defined in
section 1.2.1 for fixed tanks, as modified by the special provisions of this Chapter.

Bulk containers intended for the carriage of dangerous goods on MEMUs shall comply with the
requirements for bulk containers of type BK2.

Where a single tank or bulk container contains more than one substance each substance shall be
separated by at least two walls with drained air space between.


Tanks with a capacity of 1 000 litres or more

These tanks shall meet the requirements of section 6.8.2.

For UN Nos. 1942 and 3375, the tank shall meet the requirements of Chapters 4.3 and 6.8 concerning
breather devices and, in addition, shall have bursting discs or other suitable means of emergency
pressure relief, approved by the competent authority of the country of use.

For shells not of a circular cross-section, for example box-shaped or elliptical shells, which cannot be
calculated according to and standards or technical code mentioned therein, the ability to
withstand the permissible stress may be demonstrated by a pressure test specified by the competent
These tanks shall meet the requirements of sub-section other than, and to
The thickness of these shells shall not be less than the values given in the table below:


Minimum thickness

Austenitic stainless steels

2.5 mm

Other steels

3 mm

Aluminium alloys

4 mm

Pure aluminium of 99.80%

6 mm

Protection of the tank against damage through lateral impact or overturning shall be provided.
Protection shall be provided according to or the competent authority shall approve
alternative protection measures.

By derogation from the requirements of tanks do not need to be marked with the tank code
and the special provisions, as applicable.
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