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

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 6.8.2.1.4 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
authority.
These tanks shall meet the requirements of sub-section 6.8.2.1 other than 6.8.2.1.3, 6.8.2.1.4 and
6.8.2.1.13 to 6.8.2.1.22.
The thickness of these shells shall not be less than the values given in the table below:
 
 

Material

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 6.8.2.1.20 or the competent authority shall approve
alternative protection measures.

By derogation from the requirements of 6.8.2.5.2 tanks do not need to be marked with the tank code
and the special provisions, as applicable.

Tanks with a capacity of less than 1 000 litres

The construction of these tanks shall meet the requirements of sub-section 6.8.2.1 other than 6.8.2.1.3,
6.8.2.1.4, 6.8.2.1.6, 6.8.2.1.10 to 6.8.2.1.23 and 6.8.2.1.28.

The equipment of these tanks shall meet the requirements of 6.8.2.2.1. 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.

The thickness of these shells shall not be less than the values given in the table below:

Material

Minimum thickness

Austenitic stainless steels

2.5 mm

Other steels

3 mm

Aluminium alloys

4 mm

Pure aluminium of 99.80%

6 mm

 

Tanks may have constructional parts that are without a radius of convexity. Alternative supportive
measures may be curved walls, corrugated walls or ribs. In at least one direction the distance between
parallel supports on each side of the tank shall not be greater than 100 times the wall thickness.

Welds shall be skilfully made and shall afford the fullest safety. Welding shall be performed by
skilled welders using a welding process whose effectiveness (including any heat treatments required)
has been demonstrated by test.
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