The manifold shall be designed for service in a temperature range of -20° C to +50° C.
The manifold shall be designed, constructed and installed so as to avoid the risk of damage due to
thermal expansion and contraction, mechanical shock and vibration. All piping shall be of suitable
metallic material. Welded pipe joints shall be used wherever possible.
Joints in copper tubing shall be brazed or have an equally strong metal union. The melting point of
brazing materials shall be no lower than 525ºC. The joints shall not decrease the strength of tubing as
may happen when cutting threads.
Except for UN No.1001 acetylene, dissolved, the permissible maximum stress σ of the manifolding
arrangement at the test pressure of the receptacles shall not exceed 75% of the guaranteed yield
strength of the material.
The necessary wall thickness of the manifolding arrangement for the carriage of UN No.1001
acetylene, dissolved shall be calculated according to an approved code of practice.
NOTE: For the yield strength, see 126.96.36.199.11.
The basic requirements of this paragraph shall be deemed to have been complied with if the following
standards are applied: (Reserved).
By derogation from the requirements of 188.8.131.52.3, 184.108.40.206.4 and 220.127.116.11.7, for cylinders, tubes,
pressure drums and bundles of cylinders (frames) forming a battery-vehicle or MEGC, the required
closing devices may be provided for within the manifolding arrangement.
If one of the elements is equipped with a safety valve and shut-off devices are provided between the
elements, every element shall be so equipped.
The filling and discharge devices may be affixed to a manifold.
Each element, including each individual cylinder of a bundle, intended for the carriage of toxic gases,
shall be capable of being isolated by a shut-off valve.
Battery-vehicles or MEGCs intended for the carriage of toxic gases shall not have safety valves,
unless the safety valves are preceded by a bursting disc. In the latter case, the arrangement of the
bursting disc and safety valve shall be satisfactory to the competent authority.
When battery-vehicles or MEGCs are intended for carriage by sea, the requirements of 18.104.22.168.26
shall not prohibit the fitting of safety valves conforming to the IMDG Code.
Receptacles which are elements of a battery-vehicle or MEGC intended for the carriage of flammable
gases shall be combined in groups of not more than 5 000 litres which are capable of being isolated by
a shut-off valve.
Each element of a battery-vehicle or MEGC intended for the carriage of flammable gases, when
consisting of tanks conforming to this Chapter, shall be capable of being isolated by a shut-off valve.
Inspections and tests
The materials of every welded shell with the exception of cylinders, tubes, pressure drums and
cylinders as part of bundles of cylinders which are elements of a battery-vehicle or of a MEGC shall
be tested according to the method described in 6.8.5.
The basic requirements for the test pressure are given in 22.214.171.124.1 to 126.96.36.199.4 and the minimum test
pressures are given in the table of gases and gas mixtures in 188.8.131.52.5.
The first hydraulic pressure test shall be carried out before thermal insulation is placed in position.
When the shell, its fittings, piping and items of equipment have been tested separately, the tank shall
be subjected to a leakproofness test after assembly.
The capacity of each shell intended for the carriage of compressed gases filled by mass, liquefied
gases or dissolved gases shall be determined, under the supervision of an expert approved by the
competent authority, by weighing or volumetric measurement of the quantity of water which fills the
shell; the measurement of shell capacity shall be accurate to within 1%. Determination by a
calculation based on the dimensions of the shell is not permitted. The maximum filling masses
allowed in accordance with packing instruction P200 or P203 in 184.108.40.206 as well as 220.127.116.11.2 and
18.104.22.168.3 shall be prescribed by an approved expert.