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 4.1.4.1 and in 6.2.1.6.

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 6.7.5.10.4.

The periodic testing and inspection requirements for MEGCs are specified in 6.7.5.12. 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.

Filling

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 4.1.4.1 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.

The opening(s) for filling shall be closed by caps or plugs. The leakproofness of the closures and
equipment shall be verified by the filler after filling.

MEGCs shall not be offered for filling:
(a) when damaged to such an extent that the integrity of the pressure receptacles or its structural or
service equipment may be affected;
(b) unless the pressure receptacles and its structural and service equipment has been examined and
found to be in good working order; and
(c) unless the required certification, retest, and filling marks are legible.

Charged MEGCs shall not be offered for carriage;
(a) when leaking;
(b) when damaged to such an extent that the integrity of the pressure receptacles or its structural or
service equipment may be affected;
(c) unless the pressure receptacles and its structural and service equipment have been examined
and found to be in good working order; and
(d) unless the required certification, retest, and filling marks are legible.

Empty MEGCs that have not been cleaned and purged shall comply with the same requirements as
MEGCs filled with the previous substance.

Portable tank instructions and special provisions

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