Dangerous Goods by Road
For insulated portable tanks the capacity and setting of emergency-relief device(s) shall be determined
assuming a loss of insulation from 1% of the surface area.
Vacuum-relief devices and spring-loaded valves shall be provided with flame arresters. Due attention
shall be paid to the reduction of the relief capacity caused by the flame arrester.
Service equipment such as valves and external piping shall be so arranged that no substance remains
in them after filling the portable tank.
Portable tanks may be either insulated or protected by a sun-shield. If the SADT of the substance in
the portable tank is 55 °C or less, or the portable tank is constructed of aluminium, the portable tank
shall be completely insulated. The outer surface shall be finished in white or bright metal.
The degree of filling shall not exceed 90% at 15 °C.
The mark as required in 6.7.2.20.2 shall include the UN number and the technical name with the
approved concentration of the substance concerned.
Organic peroxides and self-reactive substances specifically listed in portable tank instruction T23
in 4.2.5.2.6 may be carried in portable tanks.
Additional provisions applicable to the carriage of Class 6.1 substances in portable tanks
(Reserved)
Additional provisions applicable to the carriage of Class 6.2 substances in portable tanks
(Reserved)
Additional provisions applicable to the carriage of Class 7 substances in portable tanks
Portable tanks used for the carriage of radioactive material shall not be used for the carriage of other goods.
The degree of filling for portable tanks shall not exceed 90% or, alternatively, any other value
approved by the competent authority.
Additional provisions applicable to the carriage of Class 8 substances in portable tanks
Pressure-relief devices of portable tanks used for the carriage of Class 8 substances shall be inspected
at intervals not exceeding one year.
Additional provisions applicable to the carriage of Class 9 substances in portable tanks
(Reserved)