Dangerous Goods by Road
Portable tanks shall not be filled above their maximum permissible gross mass and the maximum
permissible load mass specified for each gas to be carried.
Portable tanks shall not be offered for carriage:
(a) In an ullage condition liable to produce an unacceptable hydraulic force due to surge within the
shell;
(b) When leaking;
(c) When damaged to such an extent that the integrity of the 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 6.7.3.13.4 need not be provided with a means of closing
off the forklift pockets.
General provisions for the use of portable tanks for the carriage of refrigerated liquefied gases
This section provides general provisions applicable to the use of portable tanks for the carriage of
refrigerated liquefied gases.
Portable tanks shall conform to the design, construction, inspection and testing requirements detailed
in 6.7.4. Refrigerated liquefied gases shall be carried in portable tanks conforming to portable tank
instruction T75 as described in 4.2.5.2.6 and the portable tank special provisions assigned to each
substance in Column (11) of Table A of Chapter 3.2 and described in 4.2.5.3.
During carriage, portable tanks shall be adequately protected against damage to the shell and service
equipment resulting from lateral and longitudinal impact and overturning. If the shell and service
equipment are so constructed as to withstand impact or overturning it need not be protected in this
way. Examples of such protection are provided in 6.7.4.12.5.
Unless the name of the gas(es) being carried appears on the metal plate described in 6.7.4.15.2, a copy
of the certificate specified in 6.7.4.13.1 shall be made available upon a competent authority request
and readily provided by the consignor, consignee or agent, as appropriate.
Empty portable tanks not cleaned and not gas-free shall comply with the same provisions as portable
tanks filled with the previous substance.
Filling
Prior to filling the portable tank shall be inspected to ensure that it is authorized for the refrigerated
liquefied gas to be carried and that the portable tank is not loaded with refrigerated liquefied gases
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. During filling, the temperature of the refrigerated liquefied gas shall be within the limits of
the design temperature range.
In estimating the initial degree of filling the necessary holding time for the intended journey including
any delays which might be encountered shall be taken into consideration. The initial degree of filling
of the shell, except as provided for in 4.2.3.6.3 and 4.2.3.6.4, shall be such that if the contents, except
helium, were to be raised to a temperature at which the vapour pressure is equal to the maximum
allowable working pressure (MAWP) the volume occupied by liquid would not exceed 98%.
Shells intended for the carriage of helium can be filled up to but not above the inlet of the
pressure-relief device.
A higher initial degree of filling may be allowed, subject to approval by the competent authority,
when the intended duration of carriage is considerably shorter than the holding time.