Special provisions

NOTE 1: For liquids having a flash-point of not more than 60 °C and for flammable gases, see
also 6.8.2.1.26, 6.8.2.1.27 and 6.8.2.2.9.
NOTE 2: For requirements for tanks subjected to a pressure test of not less than 1 MPa (10 bar)
or for tanks intended for the carriage of refrigerated liquefied gases, see 6.8.5.
When they are shown under an entry in Column (13) of Table A of Chapter 3.2, the following special
provisions apply:
(a) Construction (TC)
TC1 The requirements of 6.8.5 are applicable to the materials and construction of these shells.
TC2 Shells, and their items of equipment, shall be made of aluminium not less than 99.5% pure or
of suitable steel not liable to cause hydrogen peroxide to decompose. Where shells are made
of aluminium not less than 99.5% pure, the wall thickness need not exceed 15 mm, even
where calculation in accordance with 6.8.2.1.17 gives a higher value.
TC3 The shells shall be made of austenitic steel.
TC4 Shells shall be provided with an enamel or equivalent protective lining if the material of
the shell is attacked by UN No. 3250 chloroacetic acid.
TC5 Shells shall be provided with a lead lining not less than 5 mm thick or an equivalent lining.
TC6 Where the use of aluminium is necessary for tanks, such tanks shall be made of aluminium
not less than 99.5% pure; the wall thickness need not exceed 15 mm even where calculation
in accordance with 6.8.2.1.17 gives a higher value.
TC7 The effective minimum thickness of the shell shall not be less than 3 mm.
TC8 The shells shall be made of aluminium or aluminium alloy. The shells may be designed for
an external design pressure of not less than 5 kPa (0.05 bar).
(b) Items of equipment (TE)
TE1 (Deleted)
TE2 (Deleted)
TE3 Tanks shall in addition meet the following requirements. The heating device shall not
penetrate into, but shall be exterior to the shell. However, a pipe used for extracting the
phosphorus may be equipped with a heating jacket. The device heating the jacket shall be so
regulated as to prevent the temperature of the phosphorus from exceeding the filling
temperature of the shell. Other piping shall enter the shell in its upper part; openings shall be
situated above the highest permissible level of the phosphorus and be capable of being
completely enclosed under lockable caps. The tank shall be equipped with a gauging system
for verifying the level of the phosphorus and, if water is used as a protective agent, with a
fixed gauge mark showing the highest permissible level of the water.
TE4 Shells shall be equipped with thermal insulation made of materials which are not readily
flammable.
TE5 If shells are equipped with thermal insulation, such insulation shall be made of materials
which are not readily flammable.
TE6 Tanks may be equipped with a device of a design which precludes its obstruction by the
substance carried and which prevents leakage and the build-up of excess overpressure or
underpressure inside the shell.
TE7 The shell-discharge system shall be equipped with two mutually independent shut-off devices
mounted in series, the first taking the form of a quick-closing internal
stop-valve of an approved type and the second that of an external stop-valve, one at each end
of the discharge pipe. A blank flange, or another device providing the same measure of
security, shall also be fitted at the outlet of each external stop-valve. The internal stop-valve
shall be such that if the pipe is wrenched off the stop-valve will remain integral with the shell
and in the closed position.
TE8 The connections to the external pipe-sockets of tanks shall be made of materials not liable to
cause decomposition of hydrogen peroxide.
TE9 Tanks shall be fitted in their upper part with a shut-off device preventing any build-up of
excess pressure inside the shell due to the decomposition of the substances carried, any
leakage of liquid, and any entry of foreign matter into the shell.
TE10 The shut-off devices of tanks shall be so designed as to preclude obstruction of the devices by
the solidified substance during carriage. Where tanks are sheathed in thermally-insulating
material, the material shall be of an inorganic nature and entirely free from combustible
matter.
TE11 Shells and their service equipment shall be so designed as to prevent the entry of foreign
matter, leakage of liquid or any building up of dangerous excess pressure inside the shell due
to the decomposition of the substances carried. A safety valve preventing the entry of foreign
matter also fulfils this provision.
TE12 Tanks shall be equipped with thermal insulation complying with the requirements of
6.8.3.2.14. If the SADT of the organic peroxide in the tank is 55 °C or less, or the tank is
constructed of aluminium, the shell shall be completely insulated. The sun shield and any part
of the tank not covered by it, or the outer sheathing of a complete lagging, shall be painted
white or finished in bright metal. The paint shall be cleaned before each transport journey and
renewed in case of yellowing or deterioration. The thermal insulation shall be free from
combustible matter. Tanks shall be fitted with temperature sensing devices.
Tanks shall be fitted with safety valves and emergency pressure-relief devices. Vacuum-relief
devices may also be used. Emergency pressure-relief devices shall operate at pressures
determined according to both the properties of the organic peroxide and the construction
characteristics of the tank. Fusible elements shall not be permitted in the body of the shell.
Tanks shall be fitted with spring-loaded safety valves to prevent significant pressure build-up
within the shell of the decomposition products and vapours released at a temperature of
50 °C. The capacity and start-to-discharge pressure of the safety-valve(s) shall be based on
the results of the tests specified in special provision TA2. The start-to-discharge pressure
shall however in no case be such that liquid could escape from the valve(s) if the tank were
overturned.
The emergency-relief devices may be of the spring-loaded or frangible types designed to vent
all the decomposition products and vapours evolved during a period of not less than one hour
of complete fire-engulfment as calculated by the following formula:
The start-to-discharge pressure of the emergency-relief device(s) shall be higher than that
above specified and based on the results of the tests referred to in special provision TA2. The
emergency-relief devices shall be dimensioned in such a way that the maximum pressure in
the tank never exceeds the test pressure of the tank.
NOTE: An example of a method to determine the size of emergency-relief devices is given in
Appendix 5 of the Manual of Tests and Criteria.
and setting of the emergency-relief device(s) shall be determined assuming a loss of
insulation from 1% of the surface area.
Vacuum-relief devices and spring-loaded safety valves of tanks shall be provided with flame
arresters unless the substances to be carried and their decomposition products are noncombustible.
Due attention shall be paid to the reduction of the relief capacity caused by the
flame arrester.
TE13 Tanks shall be thermally insulated and fitted with a heating device on the outside.
TE14 Tanks shall be equipped with thermal insulation. The thermal insulation directly in contact
with the shell shall have an ignition temperature at least 50 °C higher than the maximum
temperature for which the tank was designed.
TE15 (Deleted)
TE16 (Reserved)
TE17 (Reserved)
TE18 Tanks intended for the carriage of substances filled at a temperature higher than 190 ºC shall
be equipped with deflectors placed at right angles to the upper filling openings, so as to avoid
a sudden localized increase in wall temperature during filling.
TE19
Fittings and accessories mounted in the
upper part of the tank shall be either:
- inserted in a recessed housing; or
- equipped with an internal safety valve;
or
- shielded by a cap, or by transverse
and/or longitudinal members, or by
other equally effective devices, so
profiled that in the event of
overturning the fittings and accessories
will not be damaged.
Fittings and accessories mounted in the
lower part of the tank:
Pipe-sockets, lateral shut-off devices, and
all discharge devices shall either be
recessed by at least 200 mm from the
extreme outer edge of the tank or be
protected by a rail having a coefficient of
inertia of not less than 20 cm3 transversally
to the direction of travel; their ground
clearance shall be not less than 300 mm
with the tank full.
Fittings and accessories mounted on the rear
face of the tank shall be protected by the
bumper prescribed in 9.7.6. Their height
above the ground shall be such that they
                                                                 
TE20 Notwithstanding the other tank-codes which are permitted in the hierarchy of tanks of the
rationalized approach in 4.3.4.1.2, tanks shall be equipped with a safety valve.
TE21 The closures shall be protected with lockable caps.
TE22 (Reserved)
TE23 Tanks shall be equipped with a device of a design which precludes its obstruction by the
substance carried and which prevents leakage and the build-up of excess overpressure or
underpressure inside the shell.
TE24
If tanks, intended for the carriage and
handling of bitumen, are equipped with a
spray bar at the end of the discharge pipe,
the closing device, as required by
6.8.2.2.2, may be replaced by a shut-off
valve, situated on the discharge pipe and
preceding the spray bar.
                                                               
TE25 (Reserved)
(c) Type approval (TA)
TA1 Tanks shall not be approved for the carriage of organic substances.
TA2 This substance may be carried in fixed or demountable tanks or tank-containers under the
conditions laid down by the competent authority of the country of origin, if, on the basis of
the tests mentioned below, the competent authority is satisfied that such a transport operation
can be carried out safely. If the country of origin is not party to ADR, these conditions shall
be recognized by the competent authority of the first ADR country reached by the
consignment.
For the type approval tests shall be undertaken:
- to prove the compatibility of all materials normally in contact with the substance during
carriage;
- to provide data to facilitate the design of the emergency pressure-relief devices and
safety valves taking into account the design characteristics of the tank; and
- to establish any special requirements necessary for the safe carriage of the substance.
The test results shall be included in the report for the type approval.
TA3 This substance may be carried only in tanks with the tank code LGAV or SGAV; the
hierarchy in 4.3.4.1.2 is not applicable.
TA4 The conformity assessment procedures of section 1.8.7 shall be applied by the competent
authority, its delegate or inspection body conforming to 1.8.6.2, 1.8.6.4, 1.8.6.5 and 1.8.6.8
and accredited to EN ISO/IEC 17020:2012 (except clause 8.1.3) type A.
TA5 This substance may be carried only in tanks with the tank code S2.65AN(+); the hierarchy in
4.3.4.1.2 is not applicable.
(d) Tests (TT)
TT1 Tanks of pure aluminium need to be subjected to the initial and periodic hydraulic pressure
tests at a pressure of only 250 kPa (2.5 bar) (gauge pressure).
TT2 The condition of the lining of shells shall be inspected every year by an expert approved by
the competent authority, who shall inspect the inside of the shell.
TT3 By derogation from the requirements of 6.8.2.4.2, periodic inspections shall take place at
least every eight years and shall include a thickness check using suitable instruments. For
such tanks, the leakproofness test and check for which provision is made in 6.8.2.4.3 shall be
carried out at least every four years.
TT4 (Reserved)
TT5 The hydraulic pressure tests shall take place at least every
3 years. 2½ years.

TT6

The periodic tests, including the
hydraulic pressure test, shall be
carried out at least every 3 years.
                                                                
TT7 Notwithstanding the requirements of 6.8.2.4.2, the periodic internal inspection may be
replaced by a programme approved by the competent authority.
TT8 Tanks on which the proper shipping name required for the entry UN 1005 AMMONIA,
ANHYDROUS is marked in accordance with 6.8.3.5.1 to 6.8.3.5.3 and constructed of finegrained
steel with a yield strength of more than 400 N/mm2 in accordance with the material
standard, shall be subjected at each periodic test according to 6.8.2.4.2, to magnetic particle
inspections to detect surface cracking.
For the lower part of each shell at least 20% of the length of each circumferential and
longitudinal weld shall, together with all nozzle welds and any repair or ground areas, be
inspected.
If the mark of the substance on the tank or tank plate is removed, a magnetic particle
inspection shall be carried out and these actions recorded in the inspection certificate attached
to the tank record.
Such magnetic particle inspections shall be carried out by a competent person qualified for
this method according to EN ISO 9712:2012 (Non-destructive testing – Qualification and
certification of NDT personnel – General principles).
TT9 For inspections and tests (including supervision of the manufacture) the procedures of section
1.8.7 shall be applied by the competent authority, its delegate or inspection body conforming
to 1.8.6.2, 1.8.6.4, 1.8.6.5 and 1.8.6.8 and accredited according to EN ISO/IEC 17020:2012
(except clause 8.1.3) type A.
TT10 The periodic inspections according to 6.8.2.4.2 shall take place:
at least every three years. at least every two and a half years.
TT11
For fixed tanks (tank-vehicles) and
demountable tanks used
exclusively for the carriage of
LPG, with carbon steel shells and
service equipment, the hydraulic
pressure test, may, at the time of
the periodic inspection and at the
request of the applicant, be
replaced by the non-destructive
testing (NDT) techniques listed
below. These techniques may be
used either singularly or in
combination as deemed suitable by
the competent authority, its
delegate or inspection body (see
special provision TT9):
– EN ISO 17640:2010 – Nondestructive
testing of welds –
Ultrasonic testing –
Techniques, testing levels and
assessment,
– EN ISO 17638:2009 – Nondestructive
testing of welds –
Magnetic particle testing, with
indications acceptance in
accordance with
EN ISO 23278:2009 –
Magnetic particle testing of
welds. Acceptance levels,
– EN 1711:2000 – Nondestructive
testing of welds –
Eddy current examination of
welds by complex plane
analysis,
– EN 14127:2011 – Nondestructive
testing – Ultrasonic
thickness measurement,
Personnel involved in NDT shall be
qualified, certified and have the
appropriate theoretical and practical
knowledge of the non-destructive
tests they perform, specify,
supervise, monitor or evaluate in
accordance with:
– EN ISO 9712:2012 – Nondestructive
testing –
Qualification and certification
of NDT personnel.
After direct application of heat such
as welding or cutting to the pressure
containing elements of the tank a
hydraulic test shall be carried out in
addition to any prescribed NDT.
NDT shall be performed on the areas
of the shell and equipment listed in
the table below:
 

Area of shell an d equipment

NDT

Shell longitudinal butt welds

100% NDT, using
one or more of the
following
techniques:
ultrasonic, magnetic
particle or eddy

Shell circumferential butt welds

Attachments, manway, nozzles and
opening welds (internal) direct to
the shell
High stress areas of fastening
doubling plates (over the end of the
saddle horn, plus 400 mm down
each side)

Piping and other equipment welds

 

Shell, areas that cannot be visually
inspected from the outside
Ultrasonic thickness
survey, from inside,
on a 150 mm
(maximum) spaced
grid
 
 
Irrespective of the original design
and construction standard or
technical code used for the tank, the
defect acceptance levels shall be in
accordance with the requirements of
the relevant parts of EN 14025:2013
+ A1:2016 (Tanks for the transport
of dangerous goods – metallic
pressure tanks – design and
construction), EN 12493:2013 +
A1:2014 + AC:2015 (LPG
equipment and accessories – welded
steel tanks for liquefied petroleum
gas (LPG) – road tankers – design
and manufacture),
EN ISO 23278:2009 (Nondestructive
testing of welds –
magnetic particle testing of welds –
acceptance levels) or the acceptance
standard referenced in the applicable
NDT standard.
If an unacceptable defect is found in
the tank by NDT methods it shall be
repaired and retested. It is not
permitted to hydraulic test the tank
without undertaking the required
repairs.
The results of the NDT shall be
recorded and retained for the
lifetime of the tank.
                                                                                   
 
(e) Marking (TM)
NOTE: These particulars shall be in an official language of the country of approval, and also, if that
language is not English, French or German, in English, French or German, unless any agreements
concluded between the countries concerned in the transport operation provide otherwise.
TM1 Tanks shall bear in addition to the particulars prescribed in 6.8.2.5.2, the words: "Do not
open during carriage. Liable to spontaneous combustion" (see also the Note above).
TM2 Tanks shall bear in addition to the particulars prescribed in 6.8.2.5.2, the words: "Do not
open during carriage. Gives off flammable gases on contact with water" (see also the
Note above).
TM3 Tanks shall also bear, on the plate prescribed in 6.8.2.5.1, the proper shipping name and the
maximum permissible load mass in kg for this substance.
TM4 For tanks the following additional particulars shall be marked by stamping or by any other
similar method on the plate prescribed in 6.8.2.5.2 or directly on the shell itself, if the walls
are so reinforced that the strength of the tank is not impaired: the chemical name with the
approved concentration of the substance concerned.
TM5 Tanks shall bear, in addition to the particulars referred to in 6.8.2.5.1 the date (month, year)
of the most recent inspection of the internal condition of the shell.
TM6 (Reserved)
TM7 The trefoil symbol, as described in 5.2.1.7.6, shall be marked by stamping or any other
equivalent method on the plate described in 6.8.2.5.1. This trefoil may be engraved directly
on the walls of the shell itself, if the walls are so reinforced that the strength of the shell is not
impaired.

Requirements concerning the materials and construction of fixed welded tanks, demountable welded tanks, and welded shells of tank-containers for which a test pressure of not less than 1 MPa (10 bar) is required, and of fixed welded tanks, demountable welded tanks and welded shells of tank-containers intended for the carriage of refrigerated liquefied gases of Class 2

Materials and shells

(a) Shells intended for the carriage of :
- compressed, liquefied gases or dissolved gases of Class 2;
- UN Nos. 1380, 2845, 2870, 3194 and 3391 to 3394 of Class 4.2; and
- UN No. 1052 hydrogen fluoride, anhydrous and UN No.1790 hydrofluoric acid with
more than 85% hydrogen fluoride of Class 8
shall be made of steel;
(b) Shells constructed of fine-grained steels for the carriage of:
- corrosive gases of Class 2 and UN No. 2073 ammonia solution; and
- UN No. 1052 hydrogen fluoride, anhydrous and UN No.1790 hydrofluoric acid with
more than 85% hydrogen fluoride of Class 8
shall be heat-treated for thermal stress relief;
(c) Shells intended for the carriage of refrigerated liquefied gases of Class 2, shall be made of
steel, aluminium, aluminium alloy, copper or copper alloy (e.g. brass). However, shells made
of copper or copper alloy shall be allowed only for gases containing no acetylene; ethylene,
however, may contain not more than 0.005% acetylene;
(d) Only materials appropriate to the lowest and

The following materials shall be allowed for the manufacture of shells:
(a) Steels not subject to brittle fracture at the lowest working temperature (see 6.8.5.2.1):
- mild steels (except for refrigerated liquefied gases of Class 2);
- fine-grained steels, down to a temperature of -60 ºC;
- nickel steels (with a nickel content of 0.5 to 9%), down to a temperature
of –196 ºC, depending on the nickel content;
- austenitic chrome-nickel steels, down to a temperature of -270 ºC;
(b) Aluminium not less than 99.5% pure or aluminium alloys (see 6.8.5.2.2);
(c) Deoxidized copper not less than 99.9% pure, or copper alloys having a copper content of over
56% (see 6.8.5.2.3).

(a) Shells made of steel, aluminium or aluminium alloys shall be either seamless or welded;
(b) Shells made of austenitic steel, copper or copper alloy may be hard-soldered.

The fittings and accessories may either be screwed to the shells or be secured thereto as follows:
(a) Shells made of steel, aluminium or aluminium alloy: by welding;
(b) Shells made of austenitic steel, of copper or of copper alloy: by welding or hard-soldering.

The construction of shells and their attachment to the vehicle, to the underframe or in the container
frame shall be such as to preclude with certainty any such reduction in the temperature of the loadbearing
components as would be likely to render them brittle. The means of attachment of shells shall
themselves be so designed that even when the shell is at its lowest working temperature they still
possess the necessary mechanical properties.

 

Test requirements

Steel shells

The materials used for the manufacture of shells and the weld beads shall, at their lowest working
temperature, but at least at -20 ºC, meet at least the following requirements as to impact strength:
- The tests shall be carried out with test-pieces having a V-shaped notch;
- The minimum impact strength (see 6.8.5.3.1 to 6.8.5.3.3) for test-pieces with the longitudinal
axis at right angles to the direction of rolling and a V-shaped notch (conforming to ISO R 148)
perpendicular to the plate surface, shall be 34 J/cm2 for mild steel (which, because of existing
ISO standards, may be tested with test-pieces having the longitudinal axis in the direction of
rolling); fine-grained steel; ferritic alloy steel Ni < 5%, ferritic alloy steel 5% ≤ Ni ≤ 9%; or
austenitic Cr - Ni steel;
- In the case of austenitic steels, only the weld bead need be subjected to an impact-strength test;
- For working temperatures below -196ºC the impact-strength test is not performed at the lowest
working temperature, but at -196 ºC.

Shells made of aluminium or aluminium alloy

The seams of shells shall meet the requirements laid down by the competent authority.

Shells made of copper or copper alloy

It is not necessary to carry out tests to determine whether the impact strength is adequate.

Impact-strength tests

For sheets less than 10 mm but not less than 5 mm thick, test-pieces having a cross-section of
10 mm × e mm, where "e" represents the thickness of the sheet, shall be used. Machining to 7.5 mm or
5 mm is permitted if it is necessary. The minimum value of 34 J/cm2 shall be required in every case.
NOTE: No impact-strength test shall be carried out on sheets less than 5 mm thick, or on their weld
seams.

(a) For the purpose of testing sheets, the impact strength shall be determined on three test-pieces.
Test-pieces shall be taken at right angles to the direction of rolling; however, for mild steel
they may be taken in the direction of rolling.
(b) For testing weld seams the test-pieces shall be taken as follows:
when e ≤ 10 mm:
three test-pieces with the notch at the centre of the weld;
three test-pieces with the notch in the centre of the heat affected zone (the V-notch to cross the
fusion boundary at the centre of the specimen);
 
when 10 mm < e ≤ 20 mm:
three test-pieces from the centre of the weld;
three test-pieces from the heat affected zone (the V-notch to cross the fusion boundary at the
centre of the specimen);
 
 
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