Tanks may have constructional parts that are without a radius of convexity. Alternative supportive
measures may be curved walls, corrugated walls or ribs. In at least one direction the distance between
parallel supports on each side of the tank shall not be greater than 100 times the wall thickness.

Welds shall be skilfully made and shall afford the fullest safety. Welding shall be performed by
skilled welders using a welding process whose effectiveness (including any heat treatments required)
has been demonstrated by test.

The requirements of 6.8.2.4 do not apply. However, the initial and periodic inspections of these tanks
shall be carried out under the responsibility of the user or owner of the MEMU. Shells and their
equipment shall be subject to visual examination of their external and internal condition and a
leakproofness test to the satisfaction of the competent authority at least every three years.

The requirements for type approval of 6.8.2.3 and for marking of 6.8.2.5 do not apply.

Items of equipment

Tanks with bottom discharge for UN 1942 and UN 3375 shall have at least two closures. One of these
closures may be the product mixing or discharge pump or auger.

Any piping after the first closure shall be of a fusible material (i.e. rubber hose) or have fusible
elements.

In order to avoid any loss of contents in the event of damage to the external pumps and discharge
fittings (pipes), the first closure and its seatings shall be protected against the danger of being
wrenched off by external stresses or shall be so designed as to withstand them. The filling and
discharge devices (including flanges or threaded plugs) and protective caps (if any) shall be capable
of being secured against any unintended opening.

Breather devices in accordance with 6.8.2.2.6 on tanks for UN 3375 may be substituted by "goose
necks". Such equipment shall be protected against the danger of being wrenched off by external
stresses or shall be so designed as to withstand them.

Special compartments for explosives

Compartments for packages of explosives containing detonators and/or detonator assemblies and
those containing substances or articles of compatibility group D shall be designed to provide effective
segregation such that there is no danger of transmission of detonation from the detonators and/or
detonator assemblies to the substances or articles of compatibility group D. Segregation shall be
achieved by the use of separate compartments or by placing one of the two types of explosive in a
special containment system. Either method of segregation shall be approved by the competent
authority. If the material used for the compartment is metal, the complete inside of the compartment
shall be covered with materials providing suitable fire resistance. The explosives compartments shall
be located where they are protected from impact and from damage on rough terrain and dangerous
interaction with other dangerous goods on board and from ignition sources on the vehicle e.g.
exhausts etc.
NOTE: Materials classified as class B-s3-d2 according to standard EN 13501-1:2007 + A1:2009 are
deemed to fulfil the fire resistance requirement.

7

Provisions concerning the conditions of carriage, loading, unloading and handling

7.1

GENERAL PROVISIONS

The carriage of dangerous goods is subject to the mandatory use of a particular type of transport
equipment in accordance with the provisions of this Chapter and Chapter 7.2 for carriage in packages,
Chapter 7.3 for carriage in bulk and Chapter 7.4 for carriage in tanks. In addition, the provisions of
Chapter 7.5 concerning loading, unloading and handling shall be observed.
Columns (16), (17) and (18) of Table A of Chapter 3.2 show the particular provisions of this Part that
apply to specific dangerous goods.

In addition to the provisions of this Part, vehicles used for the carriage of dangerous goods shall, as
regards their design, construction and, if appropriate, their approval, conform to the relevant
requirements of Part 9.

Large containers, portable tanks, MEGCs and tank-containers which meet the definition of "container"
given in the CSC (1972), as amended, or in UIC leaflets 591 (status at 01.10.2007, 3rd edition), 592
(status at 01.10.2013, 2nd edition), 592-2 (status at 01.10.2004, 6th edition), 592-3 (status at
01.01.1998, 2nd edition) and 592-4 (status at 01.05.2007, 3rd edition) may not be used to carry
dangerous goods unless the large container or the frame of the portable tank, MEGC or tank-container
satisfies the provisions of the CSC or of UIC leaflets 591, 592 and 592-2 to 592-4.
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