Substances shall not be carried in the same or in adjoining compartments of shells when they may
react dangerously with each other (see definition for "dangerous reaction" in 1.2.1).

The design approval certificate, the test report and the certificate showing the results of the initial
inspection and test for each portable tank issued by the competent authority or its authorized body
shall be retained by the authority or body and the owner. Owners shall be able to provide this
documentation upon the request of any competent authority.

Unless the name of the substance(s) being carried appears on the metal plate described in 6.7.2.20.2 a
copy of the certificate specified in 6.7.2.18.1 shall be made available upon the request of a competent
authority or its authorized body and readily provided by the consignor, consignee or agent, as
appropriate.

Degree of filling

Prior to filling, the consignor shall ensure that the appropriate portable tank is used and that the
portable tank is not filled with substances which in contact with the materials of the shell, gaskets,
service equipment and any protective linings, are likely to react dangerously with them to form
dangerous products or appreciably weaken these materials. The consignor may need to consult the
manufacturer of the substance in conjunction with the competent authority for guidance on the
compatibility of the substance with the portable tank materials.
 

Portable tanks shall not be filled above the extent provided in 4.2.1.9.2 to 4.2.1.9.6. The applicability
of 4.2.1.9.2, 4.2.1.9.3 or 4.2.1.9.5.1 to individual substances is specified in the applicable portable
tank instruction or special provisions in 4.2.5.2.6 or 4.2.5.3 and Column (10) or (11) of Table A of
Chapter 3.2.

The maximum degree of filling (in %) for general use is determined by the formula:

 

Degree of filling

 

The maximum degree of filling (in %) for liquids of Class 6.1 and Class 8, in packing groups I and II,
and liquids with an absolute vapour pressure of more than 175 kPa (1.75 bar) at 65 °C, is determined
by the formula:
 

In these formulae, α is the mean coefficient of cubical expansion of the liquid between the mean
temperature of the liquid during filling (tf) and the maximum mean bulk temperature during carriage
(tr) (both in °C). For liquids carried under ambient conditions α could be calculated by the formula:

in which d15 and d50 are the densities of the liquid at 15 °C and 50 °C, respectively.

The maximum mean bulk temperature (tr) shall be taken as 50 °C except that, for journeys under
temperate or extreme climatic conditions, the competent authorities concerned may agree to a lower or
require a higher temperature, as appropriate.

The provisions of 4.2.1.9.2 to 4.2.1.9.4.1 do not apply to portable tanks which contain substances
maintained at a temperature above 50 °C during carriage (e.g. by means of a heating device). For
portable tanks equipped with a heating device, a temperature regulator shall be used to ensure the
maximum degree of filling is not more than 95% full at any time during carriage.

The maximum degree of filling (in %) for solids carried above their melting point and for elevated
temperature liquids shall be determined by the following formula:
 
 
in which df and dr are the densities of the liquid at the mean temperature of the liquid during filling
and the maximum mean bulk temperature during carriage respectively.

 

Portable tanks shall not be offered for carriage:
(a) With a degree of filling, for liquids having a viscosity less than 2 680 mm2/s at 20 °C or
maximum temperature of the substance during carriage in the case of the heated substance, of
more than 20% but less than 80% unless the shells of portable tanks are divided, by partitions
or surge plates, into sections of not more than 7 500 litres capacity;
(b) With residue of substances previously carried adhering to the outside of the shell or service
equipment;
(c) When leaking or damaged to such an extent that the integrity of the portable tank or its lifting
or securing arrangements may be affected; and
(d) Unless the service equipment has been examined and found to be in good working order.

Forklift pockets of portable tanks shall be closed off when the tank is filled. This provision does not
apply to portable tanks which according to 6.7.2.17.4 need not be provided with a means of closing
off the forklift pockets.

Additional provisions applicable to the carriage of Class 3 substances in portable tanks

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