Dangerous Goods by Road
Explosive substances shall not be packed in inner or outer packagings where the differences in
internal and external pressures, due to thermal or other effects, could cause an explosion or rupture of
the package.
Whenever loose explosive substances or the explosive substance of an uncased or partly cased article
may come into contact with the inner surface of metal packagings (1A1, 1A2, 1B1, 1B2, 1N1, 1N2,
4A, 4B, 4N and metal receptacles), the metal packaging shall be provided with an inner liner or
coating (see 4.1.1.2).
Packing instruction P101 may be used for any explosive provided the packaging has been approved by
a competent authority regardless of whether the packaging complies with the packing instruction
assignment in Column (8) of Table A of Chapter 3.2.
Special packing provisions for goods of Class 2 and goods of other classes assigned to packing instruction P200
This section provides general requirements applicable to the use of pressure receptacles and open
cryogenic receptacles for the carriage of Class 2 substances and goods of other classes assigned to
packing instruction P200 (e.g. UN 1051 hydrogen cyanide, stabilized). Pressure receptacles shall be
constructed and closed so as to prevent any loss of contents which might be caused under normal
conditions of carriage, including by vibration, or by changes in temperature, humidity or pressure
(resulting from change in altitude, for example).
Parts of pressure receptacles and open cryogenic receptacles which are in direct contact with
dangerous goods shall not be affected or weakened by those dangerous goods and shall not cause a
dangerous effect (e.g. catalysing a reaction or reacting with the dangerous goods) (see also table of
standards at the end of this section).
Pressure receptacles, including their closures and open cryogenic receptacles, shall be selected to
contain a gas or a mixture of gases according to the requirements of 6.2.1.2 and the requirements of
the relevant packing instructions of 4.1.4.1. This sub-section also applies to pressure receptacles
which are elements of MEGCs and battery-vehicles.
A change of use of a refillable pressure receptacle shall include emptying, purging and evacuation
operations to the extent necessary for safe operation (see also table of standards at the end of this
section). In addition, a pressure receptacle that previously contained a Class 8 corrosive substance or a
substance of another class with a corrosive subsidiary risk shall not be authorized for the carriage of a
Class 2 substance unless the necessary inspection and testing as specified in 6.2.1.6 and 6.2.3.5
respectively have been performed.
Prior to filling, the packer shall perform an inspection of the pressure receptacle or open cryogenic
receptacle and ensure that the pressure receptacle or open cryogenic receptacle is authorized for the
substance and, in case of a chemical under pressure, for the propellant to be carried and that the
requirements have been met. Shut-off valves shall be closed after filling and remain closed during
carriage. The consignor shall verify that the closures and equipment are not leaking.
NOTE: Shut-off valves fitted to individual cylinders in bundles may be open during carriage, unless
the substance carried is subject to special packing provision ‘k’ or ‘q’ in packing provision P200.
Pressure receptacles and open cryogenic receptacles shall be filled according to the working pressures,
filling ratios and provisions specified in the appropriate packing instruction for the specific substance
being filled. Reactive gases and gas mixtures shall be filled to a pressure such that if complete
decomposition of the gas occurs, the working pressure of the pressure receptacle shall not be
exceeded. Bundles of cylinders shall not be filled in excess of the lowest working pressure of any
given cylinder in the bundle.
Pressure receptacles, including their closures, shall conform to the design, construction, inspection
and testing requirements detailed in Chapter 6.2. When outer packagings are prescribed, the pressure
receptacles and open cryogenic receptacles shall be firmly secured therein. Unless otherwise specified
in the detailed packing instructions, one or more inner packagings may be enclosed in one outer
packaging.
Valves shall be designed and constructed in such a way that they are inherently able to withstand
damage without release of the contents or shall be protected from damage which could cause
inadvertent release of the contents of the pressure receptacle, by one of the following methods (see
also table of standards at the end of this section):
(a) Valves are placed inside the neck of the pressure receptacle and protected by a threaded plug or
cap;
(b) Valves are protected by caps. Caps shall possess vent-holes of sufficient cross-sectional area to
evacuate the gas if leakage occurs at the valves;
(c) Valves are protected by shrouds or guards;
(d) Pressure receptacles are carried in frames, (e.g. cylinders in bundles); or
(e) Pressure receptacles are carried in protective boxes. For UN pressure receptacles the packaging
as prepared for carriage shall be capable of meeting the drop test specified in 6.1.5.3 at the
packing group I performance level.
Non-refillable pressure receptacles shall:
(a) be carried in an outer packaging, such as a box or crate, or in shrink-wrapped or stretchwrapped
trays;
(b) be of a water capacity less than or equal to 1.25 litres when filled with flammable or toxic gas;
(c) not be used for toxic gases with an LC50 less than or equal to 200 ml/m3; and
(d) not be repaired after being put into service.
Refillable pressure receptacles, other than cryogenic receptacles, shall be periodically inspected
according to the provisions of 6.2.1.6, or 6.2.3.5.1 for non UN receptacles, and packing instruction
P200, P205 or P206 as applicable. Pressure relief valves for closed cryogenic receptacles shall be
subject to periodic inspections and tests according to the provisions of 6.2.1.6.3 and packing
instruction P203. Pressure receptacles shall not be filled after they become due for periodic inspection
but may be carried after the expiry of the time-limit for purposes of performing inspection or disposal,
including the intermediate carriage operations.
Repairs shall be consistent with the fabrication and testing requirements of the applicable design and
construction standards and are only permitted as indicated in the relevant periodic inspection
standards specified in chapter 6.2. Pressure receptacles, other than the jacket of closed cryogenic
receptacles, shall not be subjected to repairs of any of the following:
(a) weld cracks or other weld defects;
(b) cracks in walls;
(c) leaks or defects in the material of the wall, head or bottom.