Inspection and testing

MEGCs meeting the definition of container in the International Convention for Safe Containers
(CSC), 1972, as amended, shall not be used unless they are successfully qualified by subjecting a
representative prototype of each design to the Dynamic, Longitudinal Impact Test prescribed in the
Manual of Tests and Criteria, Part IV, Section 41.

The elements and items of equipment of each MEGC shall be inspected and tested before being put
into service for the first time (initial inspection and test). Thereafter, MEGCs shall be inspected at no
more than five-year intervals (5 year periodic inspection). An exceptional inspection and test shall be
performed, regardless of the last periodic inspection and test, when necessary according to 6.7.5.12.5.

The initial inspection and test of an MEGC shall include a check of the design characteristics, an
external examination of the MEGC and its fittings with due regard to the gases to be carried, and a
pressure test performed at the test pressures according to packing instruction P200 of 4.1.4.1. The
 
2 Distinguishing sign of the State of registration used on motor vehicles and trailers in international road traffic,
e.g. in accordance with the Geneva Convention on Road Traffic of 1949 or the Vienna Convention on Road Traffic of
1968.
 
pressure test of the manifold may be performed as a hydraulic test or by using another liquid or gas
with the agreement of the competent authority or its authorized body. Before the MEGC is placed into
service, a leakproofness test and a test of the satisfactory operation of all service equipment shall also
be performed. When the elements and their fittings have been pressure-tested separately, they shall be
subjected together after assembly to a leakproofness test.

 

The 5-year periodic inspection and test shall include an external examination of the structure, the
elements and the service equipment in accordance with 6.7.5.12.6. The elements and the piping shall
be tested at the periodicity specified in packing instruction P200 and in accordance with the provisions
described in 6.2.1.6. When the elements and equipment have been pressure-tested separately, they
shall be subjected together after assembly to a leakproofness test.

An exceptional inspection and test is necessary when the MEGC shows evidence of damaged or
corroded areas, leakage, or other conditions that indicate a deficiency that could affect the integrity of
the MEGC. The extent of the exceptional inspection and test shall depend on the amount of damage or
deterioration of the MEGC. It shall include at least the examinations required under 6.7.5.12.6.

The examinations shall ensure that:
(a) The elements are inspected externally for pitting, corrosion, abrasions, dents, distortions,
defects in welds or any other conditions, including leakage, that might render the MEGC
unsafe for carriage;
(b) The piping, valves, and gaskets are inspected for corroded areas, defects, and other conditions,
including leakage, that might render the MEGC unsafe for filling, discharge or carriage;
(c) Missing or loose bolts or nuts on any flanged connection or blank flange are replaced or
tightened;
(d) All emergency devices and valves are free from corrosion, distortion and any damage or defect
that could prevent their normal operation. Remote closure devices and self-closing stop-valves
shall be operated to demonstrate proper operation;
(e) Required marks on the MEGC are legible and in accordance with the applicable requirements;
and
(f) The framework, the supports and the arrangements for lifting the MEGC are in satisfactory
condition.

The inspections and tests in 6.7.5.12.1, 6.7.5.12.3, 6.7.5.12.4 and 6.7.5.12.5 shall be performed or
witnessed by a body authorized by the competent authority. When the pressure test is a part of the
inspection and test, the test pressure shall be the one indicated on the data plate of the MEGC. While
under pressure, the MEGC shall be inspected for any leaks in the elements, piping or equipment.

When evidence of any unsafe condition is discovered, the MEGC shall not be returned to service until
it has been corrected and the applicable tests and verifications are passed.

Marking

Every MEGC shall be fitted with a corrosion resistant metal plate permanently attached to the MEGC
in a conspicuous place readily accessible for inspection. The metal plate shall not be affixed to the
elements. The elements shall be marked in accordance with Chapter 6.2. 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);
(d) Pressures
(i) Test pressure (in bar gauge)3;
(ii) Initial pressure test date (month and year);
(iii) Identification mark of the initial pressure test witness;
(e) Temperatures
(i) Design temperature range (in °C)3;
(f) Elements / Capacity
(i) Number of elements;
(ii) Total water capacity (in litres)3;
(g) Periodic inspections and tests
(i) Type of the most recent periodic test (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 information shall be durably marked on a metal plate firmly secured to the MEGC:
Name of the operator
Maximum permissible load mass ________ kg
Working pressure at 15°C: ________ bar gauge
Maximum permissible gross mass (MPGM) __________ kg
Unladen (tare) mass _________ kg

6.8

REQUIREMENTS FOR THE CONSTRUCTION, EQUIPMENT, TYPE APPROVAL, INSPECTIONS AND TESTS, AND MARKING OF FIXED TANKS (TANK-VEHICLES), DEMOUNTABLE TANKS AND TANK-CONTAINERS AND TANK SWAP BODIES, WITH SHELLS MADE OF METALLIC MATERIALS, AND BATTERY-VEHICLES AND MULTIPLE ELEMENT GAS CONTAINERS (MEGCs)

NOTE 1: For portable tanks and UN multiple-element gas containers (MEGCs) see Chapter 6.7, for fibrereinforced
plastics tanks see Chapter 6.9, for vacuum operated waste tanks see Chapter 6.10.
NOTE 2: For fixed tanks (tank-vehicles) and demountable tanks with additive devices, see special provision 664
of Chapter 3.3.

Scope

The requirements across the whole width of the page apply both to fixed tanks (tank-vehicles), to
demountable tanks and battery-vehicles, and to tank-containers, tank swap bodies and MEGCs. Those
contained in a single column apply only:
- to fixed tanks (tank-vehicles), to demountable tanks and battery-vehicles (left hand column);
- to tank-containers, tank swap bodies and MEGCs (right hand column).
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