The following degrees of filling shall not be exceeded in tanks intended for the carriage of liquids at
ambient temperatures:
(a) for flammable substances, environmentally hazardous substances and flammable
environmentally hazardous substances, without additional risks (e.g. toxicity or corrosivity), in
tanks with a breather device or with safety valves (even where preceded by a bursting disc):
 

In these formulae, α is the mean coefficient of cubical expansion of the liquid between 15 °C and
50 °C, i.e. for a maximum variation in temperature of 35 °C.
 
2 It may be necessary to consult the manufacturer of the substance and the competent authority for guidance on
the compatibility of the substance with the materials of the tank, battery-vehicle or MEGC.

α is calculated by the formula:

where d15 and d50 are the relative densities of the liquid at 15 °C and 50 °C respectively.
tF is the mean temperature of the liquid during filling.

The provisions of 4.3.2.2.1 (a) to (d) above shall not apply to tanks whose contents are, by means of a
heating device, maintained at a temperature above 50 °C during carriage. In this case the degree of
filling at the outset shall be such, and the temperature so regulated, that the tank is not full to more
than 95% of its capacity and that the filling temperature is not exceeded, at any time during carriage.

Shells intended for the carriage of substances in the liquid state or liquefied gases or refrigerated
liquefied gases, which are not divided by partitions or surge plates into sections of not more than
7 500 litres capacity, shall be filled to not less than 80% or not more than 20% of their capacity.
This provision is not applicable to:
- liquids with a kinematic viscosity at 20 °C of at least 2 680 mm2/s;
- molten substances with a kinematic viscosity at the temperature of filling of at least
2 680 mm2/s;
- UN 1963 HELIUM, REFRIGERATED, LIQUID and UN 1966 HYDROGEN,
REFRIGERATED, LIQUID.

Operation

The thickness of the walls of the shell shall not, throughout its use, fall below the minimum figure
prescribed in:
 
6.8.2.1.17 to 6.8.2.1.21.                               |                              6.8.2.1.17 to 6.8.1.20.

                                                                         
During carriage tank-containers/MEGCs shall be
loaded on the carrying vehicle in such a way as to
be adequately protected by the fittings of the
carrying vehicle or of the tank-container/MEGC
itself against lateral and longitudinal impact and
against overturning3. If the tankcontainers/
MEGCs, including the service
equipment, are so constructed as to withstand
impact or overturning they need not be protected in
this way.

 

During filling and discharge of tanks, battery-vehicles and MEGCs, appropriate measures shall be
taken to prevent the release of dangerous quantities of gases and vapours. Tanks, battery-vehicles and
MEGCs shall be closed so that the contents cannot spill out uncontrolled. The openings of bottomdischarge
tanks shall be closed by means of screw-threaded plugs, blank flanges or other equally
effective devices. After filling, the filler shall ensure that all the closures of the tanks, battery-vehicles
and MEGCs are in the closed position and there is no leakage. This also applies to the upper part of
the dip tube.
 
 
 
3 Examples of protection of shells:
- protection against lateral impact may, for example, consist of longitudinal bars protecting the shell on
both sides at the level of the median line;
- protection against overturning may, for example, consist of reinforcing rings or bars fixed transversally
in relation to the frame;
- protection against rear impact, may, for example, consist of a bumper or frame.

 

Where several closure systems are fitted in series, that nearest to the substance being carried shall be
closed first.

No dangerous residue of the filling substance shall adhere to the outside of the tank during carriage.

Substances which may react dangerously with each other shall not be carried in adjoining
compartments of tanks.
Substances which may react dangerously with each other may be carried in adjoining compartments of
tanks, when these compartments are separated by a partition with a wall thickness equal to or greater
than that of the tank itself. They may also be carried separated by an empty space or an empty
compartment between loaded compartments.

Fixed tanks (tank-vehicles), demountable tanks, battery-vehicles, tank-containers, tank swap bodies
and MEGCs may not be filled or offered for carriage after the deadline for the test or inspection
required by 6.8.2.4.2, 6.8.3.4.6 and 6.8.3.4.10 has expired.
However, fixed tanks (tank-vehicles), demountable tanks, battery-vehicles, tank-containers, tank swap
bodies and MEGCs filled prior to the date of expiry of the last periodic inspection may be carried:
(a) for a period not to exceed one month after the expiry of these deadlines;
(b) unless otherwise approved by the competent authority, for a period not to exceed three months
after the expiry of these deadlines in order to allow the return of dangerous goods for proper
disposal or recycling. Reference to this exemption shall be mentioned in the transport
document.

Empty tanks, battery-vehicles and MEGCs, uncleaned

NOTE: For empty tanks, battery-vehicles and MEGCs, uncleaned, special provisions TU1, TU2,
TU4, TU16 and TU35 of 4.3.5 may apply.

No dangerous residue of the filling substance shall adhere to the outside of the tank during carriage.

To be accepted for carriage, empty tanks, battery-vehicles and MEGCs, uncleaned, shall be closed in
the same manner and be leakproof to the same degree as if they were full.
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