Where a large packaging undergoes a drop test, the sample passes the test if the entire contents are
retained even if the closure is no longer sift-proof.

Certification and test report

In respect of each design type of large packaging a certificate and mark (as in 6.6.3) shall be issued
attesting that the design type including its equipment meets the test requirements.

A test report containing at least the following particulars shall be drawn up and shall be made
available to the users of the large packaging:
1. Name and address of the test facility;
2. Name and address of applicant (where appropriate);
3. A unique test report identification;
4. Date of the test report;
5. Manufacturer of the large packaging;
6. Description of the large packaging design type (e.g. dimensions, materials, closures, thickness,
etc) and/or photograph(s);
7. Maximum capacity/maximum permissible gross mass;
8. Characteristics of test contents, e.g. types and descriptions of inner packagings or articles used;
9. Test descriptions and results;
10. The test report shall be signed with the name and status of the signatory.

The test report shall contain statements that the large packaging prepared as for carriage was tested in
accordance with the appropriate provisions of this Chapter and that the use of other packaging
methods or components may render it invalid. A copy of the test report shall be available to the
competent authority.

6.7

REQUIREMENTS FOR THE DESIGN, CONSTRUCTION, INSPECTION AND TESTING OF PORTABLE TANKS AND UN MULTIPLE-ELEMENT GAS CONTAINERS (MEGCs)

NOTE: For fixed tanks (tank-vehicles), demountable tanks and tank-containers and tank swap bodies, with
shells made of metallic materials, and battery-vehicles and multiple element gas containers (MEGCs)
other than UN MEGCs, see Chapter 6.8; for fibre-reinforced plastics tanks, see Chapter 6.9; for
vacuum operated waste tanks, see Chapter 6.10.

Application and general requirements

Application and general requirements

The requirements of this Chapter apply to portable tanks intended for the carriage of dangerous goods,
and to MEGCs intended for the carriage of non-refrigerated gases of Class 2, by all modes of carriage.
In addition to the requirements of this Chapter, unless otherwise specified, the applicable requirements
of the International Convention for Safe Containers (CSC) 1972, as amended, shall be fulfilled by any
multimodal portable tank or MEGC which meets the definition of a "container" within the terms of
that Convention. Additional requirements may apply to offshore portable tanks or MEGCs that are
handled in open seas.

In recognition of scientific and technological advances, the technical requirements of this Chapter may
be varied by alternative arrangements. These alternative arrangements shall offer a level of safety not
less than that given by the requirements of this Chapter with respect to the compatibility with
substances carried and the ability of the portable tank or MEGC to withstand impact, loading and fire
conditions. For international carriage, alternative arrangement portable tanks or MEGCs shall be
approved by the applicable competent authorities.

When a substance is not assigned a portable tank instruction (T1 to T23, T50 or T75) in Column (10)
of Table A of in Chapter 3.2, interim approval for carriage may be issued by the competent authority
of the country of origin. The approval shall be included in the documentation of the consignment and
contain as a minimum the information normally provided in the portable tank instructions and the
conditions under which the substance shall be carried.

Requirements for the design, construction, inspection and testing of portable tanks intended for the carriage of substances of Class 1 and Classes 3 to 9

Definitions

For the purposes of this section:
Alternative arrangement means an approval granted by the competent authority for a portable tank or
MEGC that has been designed, constructed or tested to technical requirements or testing methods
other than those specified in this Chapter:
Portable tank means a multimodal tank used for the carriage of substances of Class 1 and Classes 3 to
9. The portable tank includes a shell fitted with service equipment and structural equipment necessary
for the carriage of dangerous substances. The portable tank shall be capable of being filled and
discharged without the removal of its structural equipment. It shall possess stabilizing members
external to the shell, and shall be capable of being lifted when full. It shall be designed primarily to be
loaded onto a vehicle, wagon or sea-going or inland navigation vessel and shall be equipped with
skids, mountings or accessories to facilitate mechanical handling. Tank-vehicles, tank-wagons,
non-metallic tanks and intermediate bulk containers (IBCs) are not considered to fall within the
definition for portable tanks;
Shell means the part of the portable tank which retains the substance intended for carriage (tank
proper), including openings and their closures, but does not include service equipment or external
structural equipment;
Service equipment means measuring instruments and filling, discharge, venting, safety, heating,
cooling and insulating devices;
 
Structural equipment means the reinforcing, fastening, protective and stabilizing members external to
the shell;
Maximum allowable working pressure (MAWP) means a pressure that shall be not less than the
highest of the following pressures measured at the top of the shell while in operating position:
(a) The maximum effective gauge pressure allowed in the shell during filling or discharge; or
(b) The maximum effective gauge pressure to which the shell is designed which shall be not less
than the sum of:
(i) the absolute vapour pressure (in bar) of the substance at 65 °C, minus 1 bar; and
(ii) the partial pressure (in bar) of air or other gases in the ullage space being determined by
a maximum ullage temperature of 65 °C and a liquid expansion due to an increase in
mean bulk temperature of tr - tf (tf = filling temperature, usually 15 °C; tr = maximum
mean bulk temperature, 50 °C);
Design pressure means the pressure to be used in calculations required by a recognized pressure
vessel code. The design pressure shall be not less than the highest of the following pressures:
(a) The maximum effective gauge pressure allowed in the shell during filling or discharge; or
(b) The sum of:
(i) the absolute vapour pressure (in bar) of the substance at 65 °C, minus 1 bar;
(ii) the partial pressure (in bar) of air or other gases in the ullage space being determined by
a maximum ullage temperature of 65 °C and a liquid expansion due to an increase in
mean bulk temperature of tr - tf (tf = filling temperature usually 15 °C; tr = maximum
mean bulk temperature, 50 °C); and
(iii) a head pressure determined on the basis of the static forces specified in 6.7.2.2.12, but
not less than 0.35 bar; or
(c) Two thirds of the minimum test pressure specified in the applicable portable tank instruction
in 4.2.5.2.6;
Test pressure means the maximum gauge pressure at the top of the shell during the hydraulic pressure
test equal to not less than 1.5 times the design pressure. The minimum test pressure for portable tanks
intended for specific substances is specified in the applicable portable tank instruction in 4.2.5.2.6;
Leakproofness test means a test using gas subjecting the shell and its service equipment to an effective
internal pressure of not less than 25% of the MAWP;
Maximum permissible gross mass (MPGM) means the sum of the tare mass of the portable tank and
the heaviest load authorized for carriage;
Reference steel means a steel with a tensile strength of 370 N/mm2 and an elongation at fracture
of 27%;
Mild steel means a steel with a guaranteed minimum tensile strength of 360 N/mm2 to 440 N/mm2 and
a guaranteed minimum elongation at fracture conforming to 6.7.2.3.3.3;
Design temperature range for the shell shall be -40 °C to 50 °C for substances carried under ambient
conditions. For the other substances handled under elevated temperature conditions the design
temperature shall be not less than the maximum temperature of the substance during filling, discharge
or carriage. More severe design temperatures shall be considered for portable tanks subjected to
severe climatic conditions;
Fine grain steel means steel which has a ferritic grain size of 6 or finer when determined in
accordance with ASTM E 112-96 or as defined in EN 10028-3, Part 3;
Fusible element means a non-reclosable pressure relief device that is thermally actuated;
 
Offshore portable tank means a portable tank specially designed for repeated use for carriage to, from
and between offshore facilities. An offshore portable tank is designed and constructed in accordance
with the guidelines for the approval of containers handled in open seas specified by the International
Maritime Organization in document MSC/Circ.860.

General design and construction requirements

Shells shall be designed and constructed in accordance with the requirements of a pressure vessel code
recognized by the competent authority. Shells shall be made of metallic materials suitable for forming.
The materials shall in principle conform to national or international material standards. For welded
shells only a material whose weldability has been fully demonstrated shall be used. Welds shall be
skilfully made and afford complete safety. When the manufacturing process or the materials make it
necessary, the shells shall be suitably heat-treated to guarantee adequate toughness in the weld and in
the heat affected zones. In choosing the material, the design temperature range shall be taken into
account with respect to risk of brittle fracture, to stress corrosion cracking and to resistance to impact.
When fine grain steel is used, the guaranteed value of the yield strength shall be not more than
460 N/mm2 and the guaranteed value of the upper limit of the tensile strength shall be not more than
725 N/mm2 according to the material specification. Aluminium may only be used as a construction
material when indicated in a portable tank special provision assigned to a specific substance in
Column (11) of Table A of Chapter 3.2 or when approved by the competent authority. When
aluminium is authorized, it shall be insulated to prevent significant loss of physical properties when
subjected to a heat load of 110 kW/m2 for a period of not less than 30 minutes. The insulation shall
remain effective at all temperatures less than 649 °C and shall be jacketed with a material with a
melting point of not less than 700 °C. Portable tank materials shall be suitable for the external
environment in which they may be carried.

Portable tank shells, fittings, and pipework shall be constructed from materials which are:
(a) Substantially immune to attack by the substance(s) intended to be carried; or
(b) Properly passivated or neutralized by chemical reaction; or
(c) Lined with corrosion-resistant material directly bonded to the shell or attached by equivalent
means.
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