Actual holding time
The actual holding time shall be calculated for each journey in accordance with a procedure
recognized by the competent authority, on the basis of the following:
(a) The reference holding time for the refrigerated liquefied gas to be carried (see 188.8.131.52.8.1) (as
indicated on the plate referred to in 184.108.40.206.1);
(b) The actual filling density;
(c) The actual filling pressure;
(d) The lowest set pressure of the pressure limiting device(s).
The actual holding time shall be marked either on the portable tank itself or on a metal plate firmly
secured to the portable tank, in accordance with 220.127.116.11.2.
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
(b) When leaking;
(c) When damaged to such an extent that the integrity of the portable tank or its lifting or securing
arrangements may be affected;
(d) Unless the service equipment has been examined and found to be in good working order;
(e) Unless the actual holding time for the refrigerated liquefied gas being carried has been
determined in accordance with 18.104.22.168 and the portable tank is marked in accordance
with 22.214.171.124.2; and
(f) Unless the duration of carriage, after taking into consideration any delays which might be
encountered, does not exceed the actual holding time.
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 126.96.36.199.4, need not be provided with a means of closing
off the forklift pockets.
General provisions for the use of UN multiple-element gas containers (MEGCs)
This section provides general requirements applicable to the use of multiple-element gas containers
(MEGCs) for the carriage of non-refrigerated gases referred to in 6.7.5.
MEGCs shall conform to the design, construction, inspection and testing requirements detailed in
6.7.5. The elements of MEGCs shall be periodically inspected according to the provisions set out in
packing instruction P200 of 188.8.131.52 and in 184.108.40.206.
During carriage, MEGCs shall be protected against damage to the elements and service equipment
resulting from lateral and longitudinal impact and overturning. If the elements and service equipment
are so constructed as to withstand impact or overturning, they need not be protected in this way.
Examples of such protection are given in 220.127.116.11.4.
The periodic testing and inspection requirements for MEGCs are specified in 18.104.22.168. MEGCs or
their elements shall not be charged or filled after they become due for periodic inspection but may be
carried after the expiry of the time limit.
Prior to filling, the MEGC shall be inspected to ensure that it is authorized for the gas to be carried
and that the applicable provisions of ADR have been met.
Elements of MEGCs shall be filled according to the working pressures, filling ratios and filling
provisions specified in packing instruction P200 of 22.214.171.124 for the specific gas being filled into each
element. In no case shall an MEGC or group of elements be filled as a unit in excess of the lowest
working pressure of any given element.
MEGCs shall not be filled above their maximum permissible gross mass.
Isolation valves shall be closed after filling and remain closed during carriage. Toxic gases (gases of
groups T, TF, TC, TO, TFC and TOC) shall only be carried in MEGCs where each element is
equipped with an isolation valve.