The provisions of Chapter 4.3 except those of 220.127.116.11.4 and 18.104.22.168.3 apply to the carriage in vacuum
operated waste tanks and are supplemented by the provisions of 22.214.171.124 to 126.96.36.199 below.
For carriage of liquids meeting the flash point criteria of Class 3, vacuum-operated waste tanks shall
be filled through filling devices which discharge into the tank at a low level. Measures shall be taken
to minimize the production of spray.
When discharging flammable liquids with a flash-point below 23 °C by using air pressure, the
maximum allowed pressure is 100 kPa (1 bar).
The use of tanks fitted with an internal piston operating as a compartment wall is allowed only when
the substances on either side of the wall (piston) do not react dangerously with each other (see
When a vacuum pump/exhauster unit which may provide a source of ignition is used to fill or
discharge flammable liquids, precautions shall be taken to avoid ignition of the substance or to avoid
the propagation of the effects of the ignition outside the tank itself.
USE OF MOBILE EXPLOSIVES MANUFACTURING UNITS (MEMUs)
NOTE 1: For packagings, see Chapter 4.1; for portable tanks, see Chapter 4.2; for fixed tanks (tank vehicles),
demountable tanks, tank-containers and tank swap bodies with shells made of metallic materials, see
Chapter 4.3; for fibre-reinforced plastics (FRP) tanks, see Chapter 4.4; for vacuum operated waste
tanks, see Chapter 4.5.
NOTE 2: For requirements concerning construction, equipment, type approval, tests and marking, see
Chapters 6.7, 6.8, 6.9, 6.11 and 6.12.
Substances of Classes 3, 5.1, 6.1 and 8 may be carried on MEMUs conforming to Chapter 6.12, in
portable tanks if their carriage is permitted according to Chapter 4.2; or in fixed tanks, demountable
tanks, tank containers or tank swap bodies if their carriage is permitted according to Chapter 4.3; or in
fibre-reinforced plastics (FRP) tanks if their carriage is permitted according to Chapter 4.4; or in bulk
containers, if their carriage is permitted according to Chapter 7.3.
Subject to the approval of the competent authority (see 188.8.131.52.3) explosive substances or articles of
Class 1 may be carried in packages, in special compartments conforming to section 6.12.5, if their
packaging is permitted according to Chapter 4.1 and their carriage is permitted according to Chapter
7.2 and 7.5.
The following provisions apply for operation of tanks according to Chapter 6.12:
(a) For tanks with a capacity of 1 000 litres or more, the provisions of Chapter 4.2, Chapter 4.3,
except 184.108.40.206, 220.127.116.11.1, 4.3.3 and 4.3.4, or Chapter 4.4 apply to the carriage on MEMUs, and
are supplemented by the provisions of 18.104.22.168 , 22.214.171.124 and 126.96.36.199 below.
(b) For tanks with a capacity of less than 1 000 litres, the provisions of Chapter 4.2, Chapter 4.3,
except 188.8.131.52, 184.108.40.206, 220.127.116.11.1, 4.3.3 and 4.3.4, or Chapter 4.4 apply to the carriage on
MEMUs, and are supplemented by the provisions of 18.104.22.168, 22.214.171.124 and 126.96.36.199 below.
The thickness of the walls of the shell shall not, throughout its use, fall below the minimum figure
prescribed in the appropriate construction requirements.