The competent authority or its authorized body shall issue a design approval certificate for any new
design of a portable tank. This certificate shall attest that a portable tank has been surveyed by that
authority, is suitable for its intended purpose and meets the requirements of this Chapter and where
appropriate the provisions for gases provided in portable tank instruction T50 in 188.8.131.52.6. When a
series of portable tanks are manufactured without change in the design, the certificate shall be valid
for the entire series. The certificate shall refer to the prototype test report, the gases allowed to be
carried, the materials of construction of the shell and an approval number. The approval number shall
consist of the distinguishing sign or mark of the State in whose territory the approval was granted,
indicated by the distinguishing sign used on vehicles in international road traffic2, and a registration
number. Any alternative arrangements according to 184.108.40.206 shall be indicated on the certificate.
A design approval may serve for the approval of smaller portable tanks made of materials of the same
kind and thickness, by the same fabrication techniques and with identical supports, equivalent closures
and other appurtenances.
The prototype test report for the design approval shall include at least the following:
(a) The results of the applicable framework test specified in ISO 1496-3:1995;
(b) The results of the initial inspection and test in 220.127.116.11.3; and
(c) The results of the impact test in 18.104.22.168.1, when applicable.
Inspection and testing
Portable tanks 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 shell and items of equipment of each portable tank shall be inspected and tested before being put
into service for the first time (initial inspection and test) and thereafter at not more than five-year
intervals (5 year periodic inspection and test) with an intermediate periodic inspection and test (2.5
year periodic inspection and test) midway between the 5 year periodic inspections and tests. The 2.5
year inspection and test may be performed within 3 months of the specified date. An exceptional
inspection and test shall be performed regardless of the last periodic inspection and test when
necessary according to 22.214.171.124.7.
The initial inspection and test of a portable tank shall include a check of the design characteristics, an
internal and external examination of the portable tank and its fittings with due regard to the nonrefrigerated
liquefied gases to be carried, and a pressure test referring to the test pressures according to
126.96.36.199.2. The pressure test 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 portable tank is placed
into service, a leakproofness test and a test of the satisfactory operation of all service equipment shall
also be performed. When the shell and its fittings have been pressure-tested separately, they shall be
subjected together after assembly to a leakproofness test. All welds subject to full stress level in the
shell shall be inspected during the initial test by radiographic, ultrasonic, or another suitable nondestructive
test method. This does not apply to the jacket.
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
The 5 year periodic inspection and test shall include an internal and external examination and, as a
general rule, a hydraulic pressure test. Sheathing, thermal insulation and the like shall be removed
only to the extent required for reliable appraisal of the condition of the portable tank. When the shell
and equipment have been pressure-tested separately, they shall be subjected together after assembly to
a leakproofness test.
The intermediate 2.5 year periodic inspection and test shall at least include an internal and external
examination of the portable tank and its fittings with due regard to the non-refrigerated liquefied gases
intended to be carried, a leakproofness test and a check of the satisfactory operation of all service
equipment. Sheathing thermal insulation and the like shall be removed only to the extent required for
reliable appraisal of the condition of the portable tank. For portable tanks intended for the carriage of a
single non-refrigerated liquefied gas, the 2.5 year internal examination may be waived or substituted
by other test methods or inspection procedures specified by the competent authority or its authorized
A portable tank may not be filled and offered for carriage after the date of expiry of the last 5 year or
2.5 year periodic inspection and test as required by 188.8.131.52.2. However a portable tank filled prior to
the date of expiry of the last periodic inspection and test may be carried for a period not to exceed
three months beyond the date of expiry of the last periodic test or inspection. In addition, a portable
tank may be carried after the date of expiry of the last periodic test and inspection:
(a) After emptying but before cleaning, for purposes of performing the next required test or
inspection prior to refilling; and
(b) Unless otherwise approved by the competent authority, for a period not to exceed six months
beyond the date of expiry of the last periodic test or inspection, in order to allow the return of
dangerous goods for proper disposal or recycling. Reference to this exemption shall be
mentioned in the transport document.
The exceptional inspection and test is necessary when the portable tank shows evidence of damaged
or corroded areas, or leakage, or other conditions that indicate a deficiency that could affect the
integrity of the portable tank. The extent of the exceptional inspection and test shall depend on the
amount of damage or deterioration of the portable tank. It shall include at least the 2.5 year inspection
and test according to 184.108.40.206.5.
The internal and external examinations shall ensure that:
(a) The shell is inspected for pitting, corrosion, or abrasions, dents, distortions, defects in welds or
any other conditions, including leakage, that might render the portable tank unsafe for carriage.
The wall thickness shall be verified by appropriate measurement if this inspection indicates a
reduction of wall thickness;
(b) The piping, valves, and gaskets are inspected for corroded areas, defects, or any other
conditions, including leakage, that might render the portable tank unsafe for filling, discharge
(c) Devices for tightening manhole covers are operative and there is no leakage at manhole covers
(d) Missing or loose bolts or nuts on any flanged connection or blank flange are replaced or
(e) 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;
(f) Required marks on the portable tank are legible and in accordance with the applicable
(g) The framework, the supports and the arrangements for lifting the portable tank are in
The inspections and tests in 220.127.116.11.1, 18.104.22.168.3, 22.214.171.124.4, 126.96.36.199.5 and 188.8.131.52.7 shall be
performed or witnessed by an expert approved by the competent authority or its authorized body.
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 portable tank. While under pressure, the portable tank shall be inspected for
any leaks in the shell, piping or equipment.
In all cases when cutting, burning or welding operations on the shell have been effected, that work
shall be to the approval of the competent authority or its authorized body taking into account the
pressure vessel code used for the construction of the shell. A pressure test to the original test pressure
shall be performed after the work is completed.
When evidence of any unsafe condition is discovered, the portable tank shall not be returned to
service until it has been corrected and the pressure test is repeated and passed.