4.4

USE OF FIBRE-REINFORCED PLASTICS (FRP) TANKS, FIXED TANKS (TANK-VEHICLES), DEMOUNTABLE TANKS, TANK-CONTAINERS AND TANK SWAP BODIES

NOTE: For portable tanks and UN multiple-element gas containers (MEGCs), see Chapter 4.2; for fixed
tanks (tank-vehicles), demountable tanks, tank-containers and tank swap bodies, with shells made of
metallic materials, and battery-vehicles and multiple elements gas containers (MEGCs) other than
UN MEGCs, see Chapter 4.3; for vacuum operated waste containers, see Chapter 4.5.

General

The carriage of dangerous substances in fibre-reinforced plastics (FRP) tanks is permitted only when
the following conditions are met:
(a) The substance is classified in Class 3, 5.1, 6.1, 6.2, 8 or 9;
(b) The maximum vapour pressure (absolute pressure) at 50 °C of the substance does not exceed
110 kPa (1.1 bar);
(c) The carriage of the substance in metallic tanks is authorized according to 4.3.2.1.1;
(d) The calculation pressure specified for that substance in part 2 of the tank code given in Column
(12) of Table A in Chapter 3.2 does not exceed 4 bar (see also 4.3.4.1.1); and
(e) The tank complies with the provisions of Chapter 6.9 applicable for the carriage of the
substance.

Operation

The provisions of 4.3.2.1.5 to 4.3.2.2.4, 4.3.2.3.3 to 4.3.2.3.6, 4.3.2.4.1, 4.3.2.4.2, 4.3.4.1 and 4.3.4.2
shall apply.

The temperature of the substance carried shall not exceed, at the time of filling, the maximum service
temperature indicated on the tank plate referred to in 6.9.6.

When applicable to carriage in metallic tanks, the special provisions (TU) of 4.3.5 shall also apply, as
indicated in Column (13) of Table A in Chapter 3.2.

4.5

USE OF VACUUM OPERATED WASTE TANKS

NOTE: For portable tanks and UN multiple-element gas containers (MEGCs), see Chapter 4.2; for fixed
tanks (tank-vehicles), demountable tanks, tank-containers and tank swap bodies, with shells made of
metallic materials, and battery-vehicles and multiple elements gas containers (MEGCs) other than
UN MEGCs, see Chapter 4.3; for fibre reinforced plastics tanks, see Chapter 4.4.

Use

Wastes consisting of substances in Classes 3, 4.1, 5.1, 6.1, 6.2, 8 and 9 may be carried in vacuumoperated
waste tanks conforming to Chapter 6.10 if their carriage in fixed tanks, demountable tanks,
tank-containers or tank swap bodies is permitted according to Chapter 4.3. Wastes consisting of
substances assigned to tank code L4BH in Column (12) of Table A of Chapter 3.2 or to another tank
code permitted under the hierarchy in 4.3.4.1.2 may be carried in vacuum operated waste tanks with
the letter "A" or "B" in part 3 of the tank code, as indicated in No. 9.5 of the vehicle approval
certificate conforming to 9.1.3.5.

Non waste substances may be carried in vacuum-operated waste tanks under the same conditions as
mentioned under 4.5.1.1.

Operation

The provisions of Chapter 4.3 except those of 4.3.2.2.4 and 4.3.2.3.3 apply to the carriage in vacuum
operated waste tanks and are supplemented by the provisions of 4.5.2.2 to 4.5.2.6 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
4.3.2.3.6).
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