Portable tanks shall be designed and constructed with a support structure to provide a secure base
during carriage. The forces specified in 18.104.22.168.12 and the safety factor specified in 22.214.171.124.13 shall be
considered in this aspect of the design. Skids, frameworks, cradles or other similar structures are
The combined stresses caused by portable tank mountings (e.g. cradles, framework, etc.) and portable
tank lifting and tie-down attachments shall not cause excessive stress in any portion of the shell.
Permanent lifting and tie-down attachments shall be fitted to all portable tanks. Preferably they shall
be fitted to the portable tank supports but may be secured to reinforcing plates located on the shell at
the points of support.
In the design of supports and frameworks the effects of environmental corrosion shall be taken into
Forklift pockets shall be capable of being closed off. The means of closing forklift pockets shall be a
permanent part of the framework or permanently attached to the framework. Single compartment
portable tanks with a length less than 3.65 m need not have closed off forklift pockets provided that:
(a) The shell including all the fittings are well protected from being hit by the forklift blades; and
(b) The distance between the centres of the forklift pockets is at least half of the maximum length
of the portable tank.
When portable tanks are not protected during carriage, according to 126.96.36.199, the shells and service
equipment shall be protected against damage to the shell and service equipment resulting from lateral
or longitudinal impact or overturning. External fittings shall be protected so as to preclude the release
of the shell contents upon impact or overturning of the portable tank on its fittings. Examples of
(a) Protection against lateral impact which may consist of longitudinal bars protecting the shell on
both sides at the level of the median line;
(b) Protection of the portable tank against overturning which may consist of reinforcement rings or
bars fixed across the frame;
(c) Protection against rear impact which may consist of a bumper or frame;
(d) Protection of the shell against damage from impact or overturning by use of an ISO frame in
accordance with ISO 1496-3:1995.
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 substances provided in Chapter 4.2 and in Table A of Chapter 3.2.
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 substances or
group of substances allowed to be carried, the materials of construction of the shell and lining (when
applicable) 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 188.8.131.52 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 according to 184.108.40.206.3; and
(c) The results of the impact test in 220.127.116.11.1, 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 date of the last periodic inspection and test
when necessary according to 18.104.22.168.7.
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 substances
to be carried, and a pressure test. Before the portable tank is placed into service, a leakproofness test
and a check 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.
The 5-year periodic inspection and test shall include an internal and external examination and, as a
general rule, a hydraulic pressure test. For tanks only used for the carriage of solid substances, other
than toxic or corrosive substances that do not liquefy during carriage, the hydraulic pressure test may
be replaced by a suitable pressure test at 1.5 times the MAWP, subject to competent authority
approval. 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 substances 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
substance, 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 body.
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
2.5 year periodic inspection and test as required by 22.214.171.124.2. 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.