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.

Where empty tanks, battery-vehicles and MEGCs, uncleaned, are not closed in the same manner and
are not leakproof to the same degree as if they were full and where the provisions of ADR cannot be
complied with, they shall be carried, with due regard to adequate safety, to the nearest suitable place
where cleaning or repair can be carried out. Carriage is adequately safe if suitable measures have been
taken to ensure equivalent safety commensurate with the provisions of ADR and to prevent the
uncontrolled release of the dangerous goods.

Empty fixed tanks (tank-vehicles), demountable tanks, battery-vehicles, tank-containers, tank swap
bodies and MEGCs, uncleaned, may also be carried after the expiry of the periods established in
6.8.2.4.2 and 6.8.2.4.3 for undergoing the inspection.

Special provisions applicable to Class 2

Coding and hierarchy of tanks

Coding of tanks, battery-vehicles and MEGCs

The four parts of the codes (tank codes) given in Column (12) of Table A in Chapter 3.2 have the
following meanings:
 
 

Part

Description

Tank Code

1

Types of tank, battery-vehicle or MEGC

C = tank, battery-vehicle or MEGC for compressed gases;

P = tank, battery-vehicle or MEGC for liquefied gases or dissolved gases;

R = tank for refrigerated liquefied gases.

2

Calculation pressure

X = value of the minimum relevant test pressure according to the table in 4.3.3.2.5; or

22 = minimum calculation pressure in bar.

3

Openings (see

6.8.2.2 and 6.8.3.2)

B = tank with bottom filling or discharge openings with 3 closures; or

battery-vehicle or MEGC with openings below the surface of the liquid or for compressed gases;

C = tank with top filling or discharge openings with 3 closures with only cleaning openings below the surface of the liquid;

D =tank with top filling or discharge openings with 3 closures; or

battery-vehicle or MEGC with no openings below the surface of the liquid.

4

Safety valves/devices

N = tank, battery-vehicle or MEGC with safety valve according to 6.8.3.2.9 or 6.8.3.2.10 which is not hermetically closed;

H =hermetically closed tank, battery-vehicle or MEGC (see 1.2.1);

NOTE 1: The special provision TU17 indicated in Column (13) of Table A in Chapter 3.2 for certain
gases means that the gas may only be carried in a battery-vehicle or MEGC the elements of which are
composed of receptacles.
NOTE 2: The special provision TU40 indicated in Column (13) of Table A in Chapter 3.2 for certain
gases means that the gas may only be carried in a battery-vehicle or MEGC, the elements of which
are composed of seamless receptacles.
NOTE 3: The pressures indicated on the tank itself or on the panel shall be not less than the value of
"X" or the minimum calculation pressure.

Hierarchy of tanks

 

Tank

code

Other tank code(s) permitted for the substances under this code

C*BN C*BH C*CN C*CH C*DN C*DH P*BN P*BH P*CN P*CH P*DN P*DH R*BN R*CN R*DN

C#BN, C#CN, C#DN, C#BH, C#CH, C#DH C#BH, C#CH, C#DH

C#CN, C#DN, C#CH, C#DH C#CH, C#DH

C#DN, C#DH C#DH

P#BN, P#CN, P#DN, P#BH, P#CH, P#DH P#BH, P#CH, P#DH

P#CN, P#DN, P#CH, P#DH P#CH, P#DH

P#DN, P#DH P#DH

R#BN, R#CN, R#DN R#CN, R#DN

R#DN

 

The figure represented by "#" shall be equal to or greater than the figure represented by "*".
NOTE: This hierarchy does not take any special provisions into account (see 4.3.5 and 6.8.4) for
each entry.

Filling conditions and test pressures

The test pressure for tanks intended for the carriage of compressed gases shall be at least 1.5 times the
working pressure as defined in 1.2.1 for pressure receptacles.

The test pressure for tanks intended for the carriage of:
- high pressure liquefied gases; and
- dissolved gases
shall be such that, when the shell is filled to the maximum filling ratio, the pressure reached in the
shell by the substance at 55 °C for tanks with thermal insulation or 65 °C for tanks without thermal
insulation does not exceed the test pressure.

The test pressure for tanks intended for the carriage of low pressure liquefied gases will be:
(a) If the tank is equipped with thermal insulation, at least equal to the vapour pressure, reduced by
0.1 MPa (1 bar) of the liquid at 60 °C, but not less than 1 MPa (10 bar);
(b) If the tank is not equipped with thermal insulation, at least equal to the vapour pressure,
reduced by 0.1 MPa (1 bar), of the liquid at 65 °C, but not less than 1 MPa (10 bar).
The maximum permissible mass of contents per litre of capacity is calculated as follows:
Maximum permissible mass of contents per litre of capacity = 0.95 × density of the liquid phase
at 50 °C (in kg/l)
Moreover the vapour phase shall not disappear below 60 °C.
If the shells are not more than 1.5 m in diameter, the values of the test pressure and maximum filling
ratio conforming to packing instruction P200 in 4.1.4.1 shall be applicable.

The test pressure for tanks intended for the carriage of refrigerated liquefied gases shall be not less
than 1.3 times the maximum allowable working pressure and indicated on the tank but not less
than 300 kPa (3 bar) (gauge pressure); for tanks with vacuum insulation the test pressure shall be not
less than 1.3 times the maximum allowable working pressure increased by 100 kPa (1 bar).
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