Marking

Every portable tank shall be fitted with a corrosion resistant metal plate permanently attached to the
portable tank in a conspicuous place readily accessible for inspection. When for reasons of portable
tank arrangements the plate cannot be permanently attached to the shell, the shell shall be marked with
at least the information required by the pressure vessel code. As a minimum, at least the following
information shall be marked on the plate by stamping or by any other similar method:
(a) Owner information
(i) Owner’s registration number;
(b) Manufacturing information
(i) Country of manufacture;
(ii) Year of manufacture;
(iii) Manufacturer’s name or mark;
(iv) Manufacturer’s serial number;
(c) Approval information
(i) The United Nations packaging symbol 
;
This symbol shall not be used for any purpose other than certifying that a packaging, a
flexible bulk container, a portable tank or a MEGC complies with the relevant
requirements in Chapter 6.1, 6.2, 6.3, 6.5, 6.6, 6.7 or 6.11;
(ii) Approval country;
(iii) Authorized body for the design approval;
(iv) Design approval number;
(v) Letters ‘AA’, if the design was approved under alternative arrangements (see 6.7.1.2);
(vi) Pressure vessel code to which the shell is designed;
 
(d) Pressures
(i) MAWP (in bar gauge or kPa gauge)3;
(ii) Test pressure (in bar gauge or kPa gauge)3;
(iii) Initial pressure test date (month and year);
(iv) Identification mark of the initial pressure test witness;
(e) Temperatures
(i) Minimum design temperature (in °C)3;
(f) Materials
(i) Shell material(s) and material standard reference(s);
(ii) Equivalent thickness in reference steel (in mm)3;
(g) Capacity
(i) Tank water capacity at 20 °C (in litres)3;
(h) Insulation
(i) Either "Thermally insulated" or "Vacuum insulated" (as applicable);
(ii) Effectiveness of the insulation system (heat influx) (in Watts)3;
(i) Holding times – for each refrigerated liquefied gas permitted to be carried in the portable tank
(i) Name, in full, of the refrigerated liquefied gas;
(ii) Reference holding time (in days or hours)3;
(iii) Initial pressure (in bar gauge or kPa gauge)3;
(iv) Degree of filling (in kg)3;
(j) Periodic inspections and tests
(i) Type of the most recent periodic test (2.5-year, 5-year or exceptional);
(ii) Date of the most recent periodic test (month and year);
(iii) Identification mark of the authorized body who performed or witnessed the most recent
test.
 
3 The unit used shall be indicated.
 

 

The following particulars shall be durably marked either on the portable tank itself or on a metal plate
firmly secured to the portable tank.
Name of the owner and the operator
Name of the refrigerated liquefied gas being carried (and minimum mean bulk temperature)
Maximum permissible gross mass (MPGM)________kg
Unladen (tare) mass________kg
Actual holding time for gas being carried ______days (or hours)
Portable tank instruction in accordance with 4.2.5.2.6
NOTE: For the identification of the refrigerated liquefied gas(es) being carried, see also Part 5.

If a portable tank is designed and approved for handling in open seas, the words "OFFSHORE
PORTABLE TANK" shall be marked on the identification plate.

Requirements for the design, construction, inspection and testing of UN multiple-element gas containers (MEGCs) intended for the carriage of non-refrigerated gases

Definitions

For the purposes of this section:
Alternative arrangement means an approval granted by the competent authority for a portable tank or
MEGC that has been designed, constructed or tested to technical requirements or testing methods
other than those specified in this Chapter;
Elements are cylinders, tubes or bundles of cylinders;
Leakproofness test means a test using gas subjecting the elements and the service equipment of the
MEGC to an effective internal pressure of not less than 20% of the test pressure;
Manifold means an assembly of piping and valves connecting the filling and/or discharge openings of
the elements;
Maximum permissible gross mass (MPGM) means the sum of the tare mass of the MEGC and the
heaviest load authorized for carriage;
UN Multiple-element gas containers (MEGCs) are multimodal assemblies of cylinders, tubes and
bundles of cylinders which are interconnected by a manifold and which are assembled within a
framework. The MEGC includes service equipment and structural equipment necessary for the
carriage of gases;
Service equipment means measuring instruments and filling, discharge, venting and safety devices;
Structural equipment means the reinforcing, fastening, protective and stabilizing members external to
the elements.

General design and construction requirements

The MEGC shall be capable of being filled and discharged without the removal of its structural
equipment. It shall possess stabilizing members external to the elements to provide structural integrity
for handling and carriage. MEGCs shall be designed and constructed with supports to provide a secure
base during carriage and with lifting and tie-down attachments which are adequate for lifting the
MEGC including when filled to its maximum permissible gross mass. The MEGC shall be designed to
be loaded onto a vehicle, wagon or sea-going or inland navigation vessel and shall be equipped with
skids, mountings or accessories to facilitate mechanical handling.

MEGCs shall be designed, manufactured and equipped in such a way as to withstand all conditions to
which they will be subjected during normal conditions of handling and carriage. The design shall take
into account the effects of dynamic loading and fatigue.

Elements of an MEGC shall be made of seamless steel and be constructed and tested according to
6.2.1 and 6.2.2. All of the elements in an MEGC shall be of the same design type.

Elements of MEGCs, fittings and pipework shall be:
(a) Compatible with the substances intended to be carried (see ISO 11114-1:2012 and ISO 11114-
2:2013); or
(b) Properly passivated or neutralized by chemical reaction.

Contact between dissimilar metals which could result in damage by galvanic action shall be avoided.

The materials of the MEGC, including any devices, gaskets, and accessories, shall not adversely affect
the gas(es) intended for carriage in the MEGC.

MEGCs shall be designed to withstand, without loss of contents, at least the internal pressure due to
the contents, and the static, dynamic and thermal loads during normal conditions of handling and
carriage. The design shall demonstrate that the effects of fatigue, caused by repeated application of
these loads through the expected life of the multiple-element gas container, have been taken into
account.

 

MEGCs and their fastenings shall, under the maximum permissible load, be capable of withstanding
the following separately applied static forces:
(a) In the direction of travel: twice the MPGM multiplied by the acceleration due to gravity (g) 1;
(b) Horizontally at right angles to the direction of travel: the MPGM (when the direction of travel
is not clearly determined, the forces shall be equal to twice the MPGM) multiplied by the
acceleration due to gravity (g)1;
(c) Vertically upwards: the MPGM multiplied by the acceleration due to gravity (g) 1; and
(d) Vertically downwards: twice the MPGM (total loading including the effect of gravity)
multiplied by the acceleration due to gravity (g)1.
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