Chapter 4.2 — USE OF PORTABLE TANKS AND UN MULTIPLE-ELEMENT GAS CONTAINERS (MEGCs) NOTE 1: For fixed tanks (tank-vehicles), demountab

USE OF PORTABLE TANKS AND UN MULTIPLE-ELEMENT GAS CONTAINERS (MEGCs) NOTE 1: For 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), see Chapter 4.3; for fibre- reinforced plastics tanks, see Chapter 4.4; for vacuum operated waste tanks, see Chapter 4.5. NOTE 2: Portable tanks and UN MEGCs marked in accordance with the applicable provisions of Chapter 6.7 but which were approved in a State which is not a Contracting Party to ADR or approved in accordance with Chapter 6.7 of the IMDG Code may nevertheless be used for carriage under ADR.

Classes 3 to 9

This section provides general provisions applicable to the use of portable tanks for the carriage of substances of Classes 1, 3, 4.1, 4.2, 4.3, 5.1, 5.2, 6.1, 6.2, 7, 8 and 9. In addition to these general provisions, portable tanks shall conform to the design, construction, inspection and testing requirements detailed in 6.7.2. Substances shall be carried in portable tanks conforming to the applicable portable tank instruction identified in Column (10) of the Table A of Chapter 3.2 and described in 4.2.5.2.6 (T1 to T23) and the portable tank special provisions assigned to each substance in Column (11) of Table A of Chapter 3.2 and described in 4.2.5.3.

During carriage, portable tanks shall be adequately protected against damage to the shell and service equipment resulting from lateral and longitudinal impact and overturning. If the shell and service equipment are so constructed as to withstand impact or overturning it need not be protected in this way. Examples of such protection are given in 6.7.2.17.5.

Certain substances are chemically unstable. They are accepted for carriage only when the necessary steps have been taken to prevent their dangerous decomposition, transformation or polymerization during carriage. To this end, care shall in particular be taken to ensure that shells do not contain any substances liable to promote these reactions.

The temperature of the outer surface of the shell excluding openings and their closures or of the thermal insulation shall not exceed 70 °C during carriage. When necessary, the shell shall be thermally insulated.

Empty portable tanks not cleaned and not gas-free shall comply with the same provisions as portable tanks filled with the previous substance.

Substances shall not be carried in the same or in adjoining compartments of shells when they may react dangerously with each other (see definition for "dangerous reaction" in 1.2.1).

The design approval certificate, the test report and the certificate showing the results of the initial inspection and test for each portable tank issued by the competent authority or its authorized body shall be retained by the authority or body and the owner. Owners shall be able to provide this documentation upon the request of any competent authority.

copy of the certificate specified in 6.7.2.18.1 shall be made available upon the request of a competent authority or its authorized body and readily provided by the consignor, consignee or agent, as appropriate.

Prior to filling, the consignor shall ensure that the appropriate portable tank is used and that the portable tank is not filled with substances which in contact with the materials of the shell, gaskets, service equipment and any protective linings, are likely to react dangerously with them to form dangerous products or appreciably weaken these materials. The consignor may need to consult the manufacturer of the substance in conjunction with the competent authority for guidance on the compatibility of the substance with the portable tank materials.

Portable tanks shall not be filled above the extent provided in 4.2.1.9.2 to 4.2.1.9.6. The applicability of 4.2.1.9.2, 4.2.1.9.3 or 4.2.1.9.5.1 to individual substances is specified in the applicable portable tank

instruction or special provisions in 4.2.5.2.6 or 4.2.5.3 and Column (10) or (11) of Table A of Chapter 3.2.

The maximum degree of filling (in %) for general use is determined by the formula: degree of filling = 97 1 + α (tr - tf)

The maximum degree of filling (in %) for liquids of Class 6.1 and Class 8, in packing groups I and II, and liquids with an absolute vapour pressure of more than 175 kPa (1.75 bar) at 65 °C, is determined by the formula: degree of filling = 95 1 + α (tr - tf)

In these formulae,  is the mean coefficient of cubical expansion of the liquid between the mean temperature of the liquid during filling (tf) and the maximum mean bulk temperature during carriage (tr) (both in °C). For liquids carried under ambient conditions  could be calculated by the formula: α = d15- d50 35 d50

in which d15 and d50 are the densities of the liquid at 15 °C and 50 °C, respectively.

The maximum mean bulk temperature (tr) shall be taken as 50 °C except that, for journeys under temperate or extreme climatic conditions, the competent authorities concerned may agree to a lower or require a higher temperature, as appropriate.

The provisions of 4.2.1.9.2 to 4.2.1.9.4.1 do not apply to portable tanks which contain substances maintained at a temperature above 50 °C during carriage (e.g. by means of a heating device). For portable tanks equipped with a heating device, a temperature regulator shall be used to ensure the maximum degree of filling is not more than 95 % full at any time during carriage.

The maximum degree of filling (in %) for solids carried above their melting point and for elevated temperature liquids shall be determined by the following formula: degree of filling = 95 dr df

in which df and dr are the densities of the liquid at the mean temperature of the liquid during filling and the maximum mean bulk temperature during carriage respectively.

Portable tanks shall not be offered for carriage:

(a) With a degree of filling, for liquids having a viscosity less than 2 680 mm²/s at 20 °C or maximum temperature of the substance during carriage in the case of the heated substance, of more than 20 % but less than 80 % unless the shells of portable tanks are divided, by partitions or surge plates, into sections of not more than 7 500 litres capacity;

(b) With residue of substances previously carried adhering to the outside of the shell or service equipment;

(c) When leaking or damaged to such an extent that the integrity of the portable tank or its lifting or securing arrangements may be affected; and

(d) Unless the service equipment has been examined and found to be in good working order.

Forklift pockets of portable tanks shall be closed off when the tank is filled. This provision does not apply to portable tanks which according to 6.7.2.17.4 need not be provided with a means of closing off the forklift pockets.

All portable tanks intended for the carriage of flammable liquids shall be closed and be fitted with relief devices in accordance with 6.7.2.8 to 6.7.2.15.

(Reserved)

NOTE: For Class 4.1 self-reactive substances, see 4.2.1.13.1.

self-reactive substances in portable tanks

Each substance shall have been tested and a report submitted to the competent authority of the country of origin for approval. Notification thereof shall be sent to the competent authority of the country of destination. The notification shall contain relevant transport information and the report with test results. The tests undertaken shall include those necessary:

(a) To prove the compatibility of all materials normally in contact with the substance during carriage;

(b) To provide data for the design of the pressure and emergency relief devices taking into account the design characteristics of the portable tank. Any additional provision necessary for safe carriage of the substance shall be clearly described in the report.

The following provisions apply to portable tanks intended for the carriage of Type F organic peroxides or Type F self-reactive substances with a Self-Accelerating Decomposition Temperature (SADT) of 55 °C or more. In case of conflict these provisions prevail over those specified in Section 6.7.2. Emergencies to be taken into account are self-accelerating decomposition of the substance and fire-engulfment as described in 4.2.1.13.8.

The additional provisions for carriage of organic peroxides or self-reactive substances with a SADT less than 55 °C in portable tanks shall be specified by the competent authority of the country of origin. Notification thereof shall be sent to the competent authority of the country of destination.

The portable tank shall be designed for a test pressure of at least 0.4 MPa (4 bar).

Portable tanks shall be fitted with temperature sensing devices.

Portable tanks shall be fitted with pressure-relief devices and emergency-relief devices. Vacuum-relief devices may also be used. Pressure-relief devices shall operate at pressures determined according to both the properties of the substance and the construction characteristics of the portable tank. Fusible elements are not allowed in the shell.

The pressure-relief devices shall consist of spring-loaded valves fitted to prevent significant build-up within the portable tank of the decomposition products and vapours released at a temperature of 50 °C. The capacity and start-to-discharge pressure of the relief valves shall be based on the results of the tests specified in 4.2.1.13.1. The start-to-discharge pressure shall, however, in no case be such that liquid would escape from the valve(s) if the portable tank were overturned.

two, 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: q = 70961 × F × A0.82 where: q = heat absorption [W] A = wetted area [m²]

F = insulation factor

= 1 for non-insulated shells, or

F = U (923 - T) 47032 for insulated shells

K = heat conductivity of insulation layer [W·m-1·K-1]

L = thickness of insulation layer [m]

U = K/L = heat transfer coefficient of the insulation [W·m-2·K-1]

T = temperature of the substance at relieving conditions [K]

The start-to-discharge pressure of the emergency-relief device(s) shall be higher than that specified in 4.2.1.13.7 and based on the results of the tests referred to in 4.2.1.13.1. The emergency-relief devices shall be dimensioned in such a way that the maximum pressure in the portable 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".

For insulated portable tanks the capacity and setting of emergency-relief device(s) shall be determined assuming a loss of insulation from 1 % of the surface area.

shall be paid to the reduction of the relief capacity caused by the flame arrester.

them after filling the portable tank.

portable tank is 55 °C or less, or the portable tank is constructed of aluminium, the portable tank shall be completely insulated. The outer surface shall be finished in white or bright metal.

approved concentration of the substance concerned.

in 4.2.5.2.6 may be carried in portable tanks.

Portable tanks used for the carriage of radioactive material shall not be used for the carriage of other goods.

The degree of filling for portable tanks shall not exceed 90 % or, alternatively, any other value approved by the competent authority.

Pressure-relief devices of portable tanks used for the carriage of Class 8 substances shall be inspected at intervals not exceeding one year.

portable tank instruction in column (10) of the Table A of Chapter 3.2 or when the assigned portable tank instruction does not apply to carriage at temperatures above their melting point may be carried in portable tanks provided that the solid substances are classified in Classes 4.1, 4.2, 4.3, 5.1, 6.1, 8 or 9 and have no subsidiary hazard other than that of Class 6.1 or Class 8 and are in packing group II or III.

solid substances above their melting point shall conform to the provisions of portable tank instruction T4 for solid substances of packing group III or T7 for solid substances of packing group II. A portable tank which affords an equivalent or greater level of safety may be selected according to 4.2.5.2.5. The maximum degree of filling (in %) shall be determined according to 4.2.1.9.5 (TP3).

gases and chemicals under pressure

This section provides general provisions applicable to the use of portable tanks for the carriage of non- refrigerated liquefied gases and chemicals under pressure.

Portable tanks shall conform to the design, construction, inspection and testing requirements detailed in 6.7.3. Non-refrigerated liquefied gases and chemicals under pressure shall be carried in portable tanks conforming to portable tank instruction T50 as described in 4.2.5.2.6 and any portable tank special provisions assigned to specific non-refrigerated liquefied gases in Column (11) of Table A of Chapter 3.2 and described in 4.2.5.3.

During carriage, portable tanks shall be adequately protected against damage to the shell and service equipment resulting from lateral and longitudinal impact and overturning. If the shell and service equipment are so constructed as to withstand impact or overturning it need not be protected in this way. Examples of such protection are given in 6.7.3.13.5.

Certain non-refrigerated liquefied gases are chemically unstable. They are accepted for carriage only when the necessary steps have been taken to prevent their dangerous decomposition, transformation or polymerization during carriage. To this end, care shall in particular be taken to ensure that portable tanks do not contain any non-refrigerated liquefied gases liable to promote these reactions.

Unless the name of the gas(es) being carried appears on the metal plate described in 6.7.3.16.2, a copy of the certificate specified in 6.7.3.14.1 shall be made available upon a competent authority request and readily provided by the consignor, consignee or agent, as appropriate.

Empty portable tanks not cleaned and not gas-free shall comply with the same provisions as portable tanks filled with the previous non-refrigerated liquefied gas.

liquefied gas or the propellant of the chemical under pressure to be carried and that the portable tank is not loaded with non-refrigerated liquefied gases, or with chemicals under pressure which in contact with the materials of the shell, gaskets, service equipment and any protective linings, are likely to react dangerously with them to form dangerous products or appreciably weaken these materials. During filling, the temperature of the non-refrigerated liquefied gas or propellant of chemicals under pressure shall fall within the limits of the design temperature range.

The maximum mass of non-refrigerated liquefied gas per litre of shell capacity (kg/l) shall not exceed the density of the non-refrigerated liquefied gas at 50 °C multiplied by 0.95. Furthermore, the shell shall not be liquid-full at 60 °C.

Portable tanks shall not be filled above their maximum permissible gross mass and the maximum permissible load mass specified for each gas to be carried.

Portable tanks shall not be offered for carriage:

(a) In a filling condition liable to produce an unacceptable hydraulic force due to surge within the shell;

(b) When leaking;

(c) When damaged to such an extent that the integrity of the tank or its lifting or securing arrangements may be affected; and

(d) Unless the service equipment has been examined and found to be in good working order.

Forklift pockets of portable tanks shall be closed off when the tank is filled. This provision does not apply to portable tanks which according to 6.7.3.13.4 need not be provided with a means of closing off the forklift pockets.

This section provides general provisions applicable to the use of portable tanks for the carriage of refrigerated liquefied gases.

Portable tanks shall conform to the design, construction, inspection and testing requirements detailed in 6.7.4. Refrigerated liquefied gases shall be carried in portable tanks conforming to portable tank instruction T75 as described in 4.2.5.2.6 and the portable tank special provisions assigned to each substance in Column (11) of Table A of Chapter 3.2 and described in 4.2.5.3.

During carriage, portable tanks shall be adequately protected against damage to the shell and service equipment resulting from lateral and longitudinal impact and overturning. If the shell and service equipment are so constructed as to withstand impact or overturning it need not be protected in this way. Examples of such protection are provided in 6.7.4.12.5.

Unless the name of the gas(es) being carried appears on the metal plate described in 6.7.4.15.2, a copy of the certificate specified in 6.7.4.13.1 shall be made available upon a competent authority request and readily provided by the consignor, consignee or agent, as appropriate.

Empty portable tanks not cleaned and not gas-free shall comply with the same provisions as portable tanks filled with the previous substance.

Prior to filling the portable tank shall be inspected to ensure that it is authorized for the refrigerated liquefied gas to be carried and that the portable tank is not loaded with refrigerated liquefied gases which in contact with the materials of the shell, gaskets, service equipment and any protective linings, are likely to react dangerously with them to form dangerous products or appreciably weaken these materials. During filling, the temperature of the refrigerated liquefied gas shall be within the limits of the design temperature range.

In estimating the initial quantity of gas filled into the shell the necessary holding time for the intended journey including any delays which might be encountered shall be taken into consideration. The initial quantity of gas filled into the shell, except as provided for in 4.2.3.6.3 and 4.2.3.6.4, shall be such that if the contents, except helium, were to be raised to a temperature at which the vapour pressure is equal to the maximum allowable working pressure (MAWP) the volume occupied by liquid would not exceed 98 %.

Shells intended for the carriage of helium can be filled up to but not above the inlet of the pressure-relief device.

A higher initial quantity of gas filled into the shell may be allowed, subject to approval by the competent authority, when the intended duration of carriage is considerably shorter than the holding time.

by the competent authority, on the basis of the following:

(a) The reference holding time for the refrigerated liquefied gas to be carried (see 6.7.4.2.8.1) (as indicated on the plate referred to in 6.7.4.15.1);

(b) The actual filling density;

(c) The actual filling pressure;

(d) The lowest set pressure of the pressure limiting device(s).

The calculation of the actual holding time may be waived when the whole journey takes place by road only, without trans-shipment onto another vehicle and without intermediate temporary storage. When the calculation of the actual holding time is waived the provisions of 4.2.3.7.2, 4.2.3.7.3 and 4.2.3.8 (e) and (f) shall not apply.

secured to the portable tank, in accordance with 6.7.4.15.2.

5.4.1.2.2 (d)).

Portable tanks shall not be offered for carriage:

(a) In a filling condition liable to produce an unacceptable hydraulic force due to surge within the shell;

(b) When leaking;

(c) When damaged to such an extent that the integrity of the portable tank or its lifting or securing arrangements may be affected;

(d) Unless the service equipment has been examined and found to be in good working order;

(e) Unless the actual holding time for the refrigerated liquefied gas being carried has been determined in accordance with 4.2.3.7 and the portable tank is marked in accordance with 6.7.4.15.2; and

(f) Unless the duration of carriage, after taking into consideration any delays which might be encountered, does not exceed the actual holding time.

Forklift pockets of portable tanks shall be closed off when the tank is filled. This provision does not apply to portable tanks which according to 6.7.4.12.4, need not be provided with a means of closing off the forklift pockets.

(MEGCs) for the carriage of non-refrigerated gases referred to in 6.7.5.

The elements of MEGCs shall be periodically inspected according to the provisions set out in packing instruction P200 of 4.1.4.1 and in 6.2.1.6.

resulting from lateral and longitudinal impact and overturning. If the elements and service equipment are so constructed as to withstand impact or overturning, they need not be protected in this way. Examples of such protection are given in 6.7.5.10.4.

elements shall not be charged or filled after they become due for periodic inspection but may be carried after the expiry of the time limit.

that the applicable provisions of ADR have been met.

provisions specified in packing instruction P200 of 4.1.4.1 for the specific gas being filled into each element. In no case shall an MEGC or group of elements be filled as a unit in excess of the lowest working pressure of any given element.

groups T, TF, TC, TO, TFC and TOC) shall only be carried in MEGCs where each element is equipped with an isolation valve.

equipment shall be verified by the filler after filling.

(a) When damaged to such an extent that the integrity of the pressure receptacles or its structural or service equipment may be affected;

(b) Unless the pressure receptacles and its structural and service equipment has been examined and found to be in good working order; and

(c) Unless the required certification, retest, and filling marks are legible.

(a) When leaking;

(b) When damaged to such an extent that the integrity of the pressure receptacles or its structural or service equipment may be affected;

(c) Unless the pressure receptacles and its structural and service equipment have been examined and found to be in good working order; and

(d) Unless the required certification, retest, and filling marks are legible.

MEGCs filled with the previous substance.

This section includes the portable tank instructions and special provisions applicable to dangerous goods authorized to be carried in portable tanks. Each portable tank instruction is identified by an alpha- numeric code (e.g. T1). Column (10) of Table A of Chapter 3.2 indicates the portable tank instruction that shall be used for each substance permitted for carriage in a portable tank. When no portable tank instruction appears in Column (10) for a specific dangerous goods entry then carriage of the substance in portable tanks is not permitted unless a competent authority approval is granted as detailed in 6.7.1.3. Portable tank special provisions are assigned to specific dangerous goods in Column (11) of Table A of Chapter 3.2. Each portable tank special provision is identified by an alpha-numeric code (e.g. TP1). A listing of the portable tank special provisions is provided in 4.2.5.3. NOTE: The gases authorized for carriage in MEGCs are indicated with the letter "(M)" in Column (10) of Table A of Chapter 3.2.

Portable tank instructions apply to dangerous goods of Classes 1 to 9. Portable tank instructions provide specific information relevant to portable tanks provisions applicable to specific substances. These provisions shall be met in addition to the general provisions in this Chapter and the general requirements in Chapter 6.7 or Chapter 6.9.

For substances of Class 1 and Classes 3 to 9, the portable tank instructions indicate the applicable minimum test pressure, the minimum shell thickness, bottom opening requirements and pressure relief

requirements. In portable tank instruction T23, self-reactive substances of Class 4.1 and Class 5.2 organic peroxides permitted to be carried in portable tanks are listed along with the applicable control and emergency temperatures.

Non-refrigerated liquefied gases are assigned to portable tank instruction T50. T50 provides the maximum allowable working pressures, the requirements for the openings below liquid level, pressure- relief requirements and maximum filling ratio requirements for non-refrigerated liquefied gases permitted for carriage in portable tanks.

Refrigerated liquefied gases are assigned to portable tank instruction T75.

Determination of the appropriate portable tank instructions

When a specific portable tank instruction is specified in Column (10) of Table A of Chapter 3.2 for a specific dangerous goods entry additional portable tanks which possess higher minimum test pressures, greater shell thicknesses, more stringent bottom opening and pressure-relief device arrangements may be used. The following guidelines apply to determining the appropriate portable tanks which may be used for carriage of particular substances: Portable tank instruction specified Portable tank instructions also permitted T1 T2, T3, T4, T5, T6, T7, T8, T9, T10, T11, T12, T13, T14, T15, T16, T17, T18, T19, T20, T21, T22 T2 T4, T5, T7, T8, T9, T10, T11, T12, T13, T14, T15, T16, T17, T18, T19, T20, T21, T22 T3 T4, T5, T6, T7, T8, T9, T10, T11, T12, T13, T14, T15, T16, T17, T18, T19, T20, T21, T22 T4 T5, T7, T8, T9, T10, T11, T12, T13, T14, T15, T16, T17, T18, T19, T20, T21, T22 T5 T10, T14, T19, T20, T22 T6 T7, T8, T9, T10, T11, T12, T13, T14, T15, T16, T17, T18, T19, T20, T21, T22 T7 T8, T9, T10, T11, T12, T13, T14, T15, T16, T17, T18, T19, T20, T21, T22 T8 T9, T10, T13, T14, T19, T20, T21, T22 T9 T10, T13, T14, T19, T20, T21, T22 T10 T14, T19, T20, T22 T11 T12, T13, T14, T15, T16, T17, T18, T19, T20, T21, T22 T12 T14, T16, T18, T19, T20, T22 T13 T14, T19, T20, T21, T22 T14 T19, T20, T22 T15 T16, T17, T18, T19, T20, T21, T22 T16 T18, T19, T20, T22 T17 T18, T19, T20, T21, T22 T18 T19, T20, T22 T19 T20, T22 T20 T22 T21 T22 T22 None T23 None

Portable tank instructions specify the requirements applicable to a portable tank when used for the carriage of specific substances. Portable tank instructions T1 to T22 specify the applicable minimum test pressure, the minimum shell thickness (in mm reference steel) or the minimum shell thickness for fibre reinforced plastics (FRP) portable tanks, and the pressure-relief and bottom-opening requirements. T1 - T22 PORTABLE TANK INSTRUCTIONS T1 - T22 These portable tank instructions apply to liquid and solid substances of Class 1 and Classes 3 to 9. The general provisions of Section 4.2.1 and the requirements of Section 6.7.2 shall be met. The instructions for portable tanks with FRP shells apply to substances of classes 1, 3, 5.1, 6.1, 6.2, 8 and 9. Additionally, the requirements of Chapter 6.9 apply. Portable tank instruction Minimum test pressure (bar) Minimum shell thickness (in mm-reference steel for shells made of metallic materials) (see 6.7.2.4) Pressure-relief requirementsa (see 6.7.2.8) Bottom opening requirementsb (see 6.7.2.6) T1

See 6.7.2.8.3 Not allowed T6 4 See 6.7.2.4.2 Normal See 6.7.2.6.2 T7 4 See 6.7.2.4.2 Normal See 6.7.2.6.3 T8 4 See 6.7.2.4.2 Normal Not allowed T9 4 6 mm Normal Not allowed T10 4 6 mm See 6.7.2.8.3 Not allowed T11 6 See 6.7.2.4.2 Normal See 6.7.2.6.3 T12 6 See 6.7.2.4.2 See 6.7.2.8.3 See 6.7.2.6.3 T13 6 6 mm Normal Not allowed T14 6 6 mm See 6.7.2.8.3 Not allowed T15 10 See 6.7.2.4.2 Normal See 6.7.2.6.3 T16 10 See 6.7.2.4.2 See 6.7.2.8.3 See 6.7.2.6.3 T17 10 6 mm Normal See 6.7.2.6.3 T18 10 6 mm See 6.7.2.8.3 See 6.7.2.6.3 T19 10 6 mm See 6.7.2.8.3 Not allowed T20 10 8 mm See 6.7.2.8.3 Not allowed T21 10 10 mm Normal Not allowed T22 10 10 mm See 6.7.2.8.3 Not allowed a When the word "Normal" is indicated, all the requirements of 6.7.2.8 apply except for 6.7.2.8.3. b When this column indicates "Not allowed", bottom openings are not permitted when the substance to be carried is a liquid (see 6.7.2.6.1). When the substance to be carried is a solid at all temperatures encountered under normal conditions of carriage, bottom openings conforming to the requirements of 6.7.2.6.2 are authorized.

T23 PORTABLE TANK INSTRUCTION T23 This portable tank instruction applies to self-reactive substances of Class 4.1 and organic peroxides of Class 5.2. The general provisions of Section 4.2.1 and the requirements of Section 6.7.2 shall be met. The additional provisions specific to self-reactive substances of Class 4.1 and organic peroxides of Class 5.2 in 4.2.1.13 shall also be met. The formulations not listed in 2.2.41.4 or in 2.2.52.4 but listed below may also be carried packed in accordance with packing method OP8 of packing instruction P520 of 4.1.4.1, with the same control and emergency temperatures, if applicable. UN No. Substance Minimum test pressure (bar) Minimum shell thickness (mm- reference steel) Bottom opening requi- rements Pressure- relief requi- rements Degree of filling Control tempe- rature Emergency temperature 3109 ORGANIC PEROXIDE, TYPE F, LIQUID

4 See See

tert-Butyl hydro- peroxidea, not more than 72 % with water

tert-Butyl hydro- peroxide, not more than 56 % in diluent type Bb

Cumyl hydroperoxide, not more than 90 % in diluent type A

Di-tert-butyl peroxide, not more than 32 % in diluent type A

Isopropyl cumyl hydro- peroxide, not more than 72 % in diluent type A

p-Menthyl hydro- peroxide, not more than 72 % in diluent type A

Pinanyl hydro- peroxide, not more than 56 % in diluent type A

3110 ORGANIC PEROXIDE TYPE F, SOLID

4 See See

Dicumyl peroxidec

3119 ORGANIC PEROXIDE, TYPE F, LIQUID, TEMPERATURE CONTROLLED 4 See See

See d d tert-Amyl peroxyneodecanoate, not more than 47 % in diluent type A

-10 °C -5 °C tert-Butyl peroxyacetate, not more than 32 % in diluent type B

+30 °C +35 °C

a Provided that steps have been taken to achieve the safety equivalence of 65% tert-Butyl hydroperoxide and 35% water. b Diluent type B is tert-Butyl alcohol. c Maximum quantity per portable tank: 2000 kg. d As approved by the competent authority. Cont\'d on next page

T23 PORTABLE TANK INSTRUCTION (cont\'d) T23 UN No. Substance Minimum test pressure (bar) Minimum shell thickness (mm- reference steel) Bottom opening requi- rements Pressure- relief requi- rements Degree of filling Control tempe- rature Emergency temperature 3119 (Cont\'d) tert-Butyl peroxy-2- ethylhexanoate, not more than 32 % in diluent type B

tert-Butyl peroxypivalate, not more than 27 % in diluent type B

tert-Butyl peroxy- 3,5,5-trimethyl- hexanoate, not more than 32 % in diluent type B

Di-(3,5,5-trimethyl- hexanoyl) peroxide, not more than 38 % in diluent type A or type B

Peroxyacetic acid, distilled, type F, stabilizede

+35 C 3120 ORGANIC PEROXIDE, TYPE F, SOLID, TEMPERATURE CONTROLLED 4 See See

See d d 3229 SELF-REACTIVE LIQUID TYPE F 4 See See See See

3230 SELF-REACTIVE SOLID TYPE F 4 See See See See

3239 SELF-REACTIVE LIQUID TYPE F, TEMPERATURE CONTROLLED 4 See See

See See d d 3240 SELF-REACTIVE SOLID TYPE F, TEMPERATURE CONTROLLED 4 See See See See d d d As approved by the competent authority. e Formulation derived from distillation of peroxyacetic acid originating from peroxyacetic acid in concentration of not more than 41 % with water, total active oxygen (Peroxyacetic acid+H2O2) ≤ 9.5%, which fulfils the criteria of the "Manual of Tests and Criteria", paragraph 20.4.3 (f). "CORROSIVE" subsidiary hazard placard required (Model No 8, see 5.2.2.2.2).

T50 PORTABLE TANK INSTRUCTION T50 This portable tank instruction applies to non-refrigerated liquefied gases and chemicals under pressure (UN Nos. 3500, 3501, 3502, 3503, 3504 and 3505). The general provisions of Section 4.2.2 and the requirements of Section 6.7.3 shall be met. UN No. Non-refrigerated liquefied gases Max. allowable working pressure (bar): Small; Bare; Sunshield; Insulated; respectivelya Openings below liquid level Pressure- relief requirementsb (see 6.7.3.7) Maximum filling ratio 1005 Ammonia, anhydrous

mixture, stabilized See MAWP definition in

Normal See 4.2.2.7 1011 Butane

1021 1-Chloro- 1,2,2,2-tetrafluoroethane (Refrigerant gas R 124)

Normal a "Small" means tanks having a shell with a diameter of 1.5 m or less; "Bare" means tanks having a shell with a diameter of more than 1.5 m without insulation or sun shield (see 6.7.3.2.12); "Sunshield" means tanks having a shell with a diameter of more than 1.5 m with sun shield (see 6.7.3.2.12); "Insulated" means tanks having a shell with a diameter of more than 1.5 m with insulation (see 6.7.3.2.12); (See definition of "Design reference temperature" in 6.7.3.1). b The word "Normal" in the pressure relief requirements column indicates that a frangible disc as specified in 6.7.3.7.3 is not required. Cont\'d on next page

T50 PORTABLE TANK INSTRUCTION (cont\'d) T50 UN No. Non-refrigerated liquefied gases Max. allowable working pressure (bar): Small; Bare; Sunshield; Insulated; respectivelya Openings below liquid level Pressure- relief requirementsb (see 6.7.3.7) Maximum filling ratio 1028 Dichlorodifluoromethane (Refrigerant gas R 12)

to a total pressure of 1 MPa (10 bar) at 50 °C - - -

dioxide mixture with more than 9 % but not more than 87 % ethylene oxide See MAWP definition in

Normal See 4.2.2.7 1055 Isobutylene

Normal a "Small" means tanks having a shell with a diameter of 1.5 m or less; "Bare" means tanks having a shell with a diameter of more than 1.5 m without insulation or sun shield (see 6.7.3.2.12); "Sunshield" means tanks having a shell with a diameter of more than 1.5 m with sun shield (see 6.7.3.2.12); "Insulated" means tanks having a shell with a diameter of more than 1.5 m with insulation (see 6.7.3.2.12); (See definition of "Design reference temperature" in 6.7.3.1). b The word "Normal" in the pressure relief requirements column indicates that a frangible disc as specified in 6.7.3.7.3 is not required. Cont\'d on next page

T50 PORTABLE TANK INSTRUCTION (cont\'d) T50 UN No. Non-refrigerated liquefied gases Max. allowable working pressure (bar): Small; Bare; Sunshield; Insulated; respectivelya Openings below liquid level Pressure- relief requirementsb (see 6.7.3.7) Maximum filling ratio 1060 Methylacetylene and propadiene mixture, stabilized

Normal See 4.2.2.7 1077 Propylene

Normal See 4.2.2.7 1079 Sulphur dioxide

stabilized (Refrigerant gas R 1113)

See 6.7.3.7.3 a "Small" means tanks having a shell with a diameter of 1.5 m or less; "Bare" means tanks having a shell with a diameter of more than 1.5 m without insulation or sun shield (see 6.7.3.2.12); "Sunshield" means tanks having a shell with a diameter of more than 1.5 m with sun shield (see 6.7.3.2.12); "Insulated" means tanks having a shell with a diameter of more than 1.5 m with insulation (see 6.7.3.2.12); (See definition of "Design reference temperature" in 6.7.3.1). b The word "Normal" in the pressure relief requirements column indicates that a frangible disc as specified in 6.7.3.7.3 is not required. Cont\'d on next page

T50 PORTABLE TANK INSTRUCTION (cont\'d) T50 UN No. Non-refrigerated liquefied gases Max. allowable working pressure (bar): Small; Bare; Sunshield; Insulated; respectivelya Openings below liquid level Pressure- relief requirementsb (see 6.7.3.7) Maximum filling ratio 1083 Trimethylamine, anhydrous

bromide mixture with more than 2 % chloropicrin

tetrafluoroethane (Refrigerant gas R 114)

liquefied, n.o.s. See MAWP definition in

Normal See 4.2.2.7 1969 Isobutane

Normal a "Small" means tanks having a shell with a diameter of 1.5 m or less; "Bare" means tanks having a shell with a diameter of more than 1.5 m without insulation or sun shield (see 6.7.3.2.12); "Sunshield" means tanks having a shell with a diameter of more than 1.5 m with sun shield (see 6.7.3.2.12); "Insulated" means tanks having a shell with a diameter of more than 1.5 m with insulation (see 6.7.3.2.12); (See definition of "Design reference temperature" in 6.7.3.1). b The word "Normal" in the pressure relief requirements column indicates that a frangible disc as specified in 6.7.3.7.3 is not required. Cont\'d on next page

T50 PORTABLE TANK INSTRUCTION (cont\'d) T50 UN No. Non-refrigerated liquefied gases Max. allowable working pressure (bar): Small; Bare; Sunshield; Insulated; respectivelya Openings below liquid level Pressure- relief requirementsb (see 6.7.3.7) Maximum filling ratio 1973 Chlorodifluoromethane and chloropentafluoroethane mixture with fixed boiling point, with approximately 49 % chlorodifluoromethane (Refrigerant gas R 502)

1,1-difluoroethane azeotropic mixture with approximately 74 % dichlorodifluoromethane (Refrigerant gas R 500)

Normal a "Small" means tanks having a shell with a diameter of 1.5 m or less; "Bare" means tanks having a shell with a diameter of more than 1.5 m without insulation or sun shield (see 6.7.3.2.12); "Sunshield" means tanks having a shell with a diameter of more than 1.5 m with sun shield (see 6.7.3.2.12); "Insulated" means tanks having a shell with a diameter of more than 1.5 m with insulation (see 6.7.3.2.12); (See definition of "Design reference temperature" in 6.7.3.1). b The word "Normal" in the pressure relief requirements column indicates that a frangible disc as specified in 6.7.3.7.3 is not required. Cont\'d on next page

T50 PORTABLE TANK INSTRUCTION (cont\'d) T50 UN No. Non-refrigerated liquefied gases Max. allowable working pressure (bar): Small; Bare; Sunshield; Insulated; respectivelya Openings below liquid level Pressure- relief requirementsb (see 6.7.3.7) Maximum filling ratio 3057 Trifluoroacetyl chloride

dichlorodifluoromethane mixture with not more than 12.5 % ethylene oxide

See MAWP definition in 6.7.3.1 Allowed Normal See 4.2.2.7 3163 Liquefied gas, n.o.s. See MAWP definition in 6.7.3.1 Allowed Normal See 4.2.2.7 3220 Pentafluoroethane (Refrigerant gas R 125)

chlorotetrafluoroethane mixture, with not more than 8.8 % ethylene oxide

pentafluoroethane mixture, with not more than 7.9 % ethylene oxide

Normal a "Small" means tanks having a shell with a diameter of 1.5 m or less; "Bare" means tanks having a shell with a diameter of more than 1.5 m without insulation or sun shield (see 6.7.3.2.12); "Sunshield" means tanks having a shell with a diameter of more than 1.5 m with sun shield (see 6.7.3.2.12); "Insulated" means tanks having a shell with a diameter of more than 1.5 m with insulation (see 6.7.3.2.12); (See definition of "Design reference temperature" in 6.7.3.1). b The word "Normal" in the pressure relief requirements column indicates that a frangible disc as specified in 6.7.3.7.3 is not required. Cont\'d on next page

T50 PORTABLE TANK INSTRUCTION (cont\'d) T50 UN No. Non-refrigerated liquefied gases Max. allowable working pressure (bar): Small; Bare; Sunshield; Insulated; respectivelya Openings below liquid level Pressure- relief requirementsb (see 6.7.3.7) Maximum filling ratio 3299 Ethylene oxide and tetrafluoroethane mixture, with not more than 5.6 % ethylene oxide

density less than 0.880 at 15 °C in water, with more than 50 % ammonia See MAWP definition in

See 6.7.3.7.3 See 4.2.2.7 3337 Refrigerant gas R 404A

See 6.7.3.7.3 TP4c 3501 Chemical under pressure, flammable, n.o.s. See MAWP definition in

See 6.7.3.7.3 TP4c 3502 Chemical under pressure, toxic, n.o.s. See MAWP definition in

See 6.7.3.7.3 TP4c 3503 Chemical under pressure, corrosive, n.o.s. See MAWP definition in

See 6.7.3.7.3 TP4c 3504 Chemical under pressure, flammable, toxic, n.o.s. See MAWP definition in

See 6.7.3.7.3 TP4c 3505 Chemical under pressure, flammable, corrosive, n.o.s. See MAWP definition in

See 6.7.3.7.3 TP4c a "Small" means tanks having a shell with a diameter of 1.5 m or less; "Bare" means tanks having a shell with a diameter of more than 1.5 m without insulation or sun shield (see 6.7.3.2.12); "Sunshield" means tanks having a shell with a diameter of more than 1.5 m with sun shield (see 6.7.3.2.12); "Insulated" means tanks having a shell with a diameter of more than 1.5 m with insulation (see 6.7.3.2.12); (See definition of "Design reference temperature" in 6.7.3.1). b The word "Normal" in the pressure relief requirements column indicates that a frangible disc as specified in 6.7.3.7.3 is not required. c For UN Nos. 3500, 3501, 3502, 3503, 3504 and 3505, the degree of filling shall be considered instead of the maximum filling ratio.

T75 PORTABLE TANK INSTRUCTION T75 This portable tank instruction applies to refrigerated liquefied gases. The general provisions of Section 4.2.3 and the requirements of Section 6.7.4 shall be met.

Portable tank special provisions are assigned to certain substances to indicate provisions which are in addition to or in lieu of those provided by the portable tank instructions or the requirements in Chapter 6.7. Portable tank special provisions are identified by an alpha numeric code beginning with the letters "TP" (tank provision) and are assigned to specific substances in Column (11) of Table A of Chapter 3.2. The following is a list of the portable tank special provisions: TP1 The degree of filling prescribed in 4.2.1.9.2 shall not be exceeded. (degree of filling = 97 1+ α (tr - tf) ) TP2 The degree of filling prescribed in 4.2.1.9.3 shall not be exceeded. (degree of filling = 95 1+ α (tr - tf) ) TP3 The maximum degree of filling (in %) for solids carried above their melting point and for elevated temperature liquids shall be determined in accordance with 4.2.1.9.5. (degree of filling = 95 dr df ) TP4 The degree of filling shall not exceed 90 % or, alternatively, any other value approved by the competent authority (see 4.2.1.16.2). TP5 The restrictions on filling prescribed in 4.2.3.6 shall be met. TP6 To prevent the tank bursting in any event, including fire engulfment, it shall be provided with pressure-relief devices which are adequate in relation to the capacity of the tank and to the nature of the substance carried. The device shall also be compatible with the substance. TP7 Air shall be eliminated from the vapour space by nitrogen or other means. TP8 The test pressure may be reduced to 1.5 bar when the flash point of the substances carried is greater than 0 °C. TP9 A substance under this description shall only be carried in a portable tank under an approval granted by the competent authority. TP10 A lead lining, not less than 5 mm thick, which shall be tested annually, or another suitable lining material approved by the competent authority is required. A portable tank may be offered for carriage after the date of expiry of the last lining inspection for a period not to exceed three months beyond that date, after emptying but before cleaning, for purposes of performing the next required test or inspection prior to refilling. TP12 (Deleted) TP13 (Reserved) TP16 The tank shall be fitted with a special device to prevent under-pressure and excess pressure during normal carriage conditions. This device shall be approved by the competent authority.

Pressure-relief requirements are as indicated in 6.7.2.8.3 to prevent crystallization of the product in the pressure-relief valve. TP17 Only inorganic non-combustible materials shall be used for thermal insulation of the tank. TP18 Temperature shall be maintained between 18 °C and 40 °C. Portable tanks containing solidified methacrylic acid shall not be reheated during carriage.

TP19 At the time of construction, the minimum shell thickness determined according to 6.7.3.4 shall be increased by 3 mm as a corrosion allowance. Shell thickness shall be verified ultrasonically at intervals midway between periodic hydraulic tests and shall never be lower than the minimum shell thickness determined according to 6.7.3.4. TP20 This substance shall only be carried in insulated tanks under a nitrogen blanket. TP21 The shell thickness shall be not less than 8 mm. Tanks shall be hydraulically tested and internally inspected at intervals not exceeding 2.5 years. TP22 Lubricant for joints or other devices shall be oxygen compatible. TP23 Deleted. TP24 The portable tank may be fitted with a device located under maximum filling conditions in the vapour space of the shell to prevent the build-up of excess pressure due to the slow decomposition of the substance carried. This device shall also prevent an unacceptable amount of leakage of liquid in the case of overturning or entry of foreign matter into the tank. This device shall be approved by the competent authority or its authorized body. TP25 Sulphur trioxide 99.95 % pure and above may be carried in tanks without an inhibitor provided that it is maintained at a temperature equal to or above 32.5 °C. TP26 When carried under heated conditions, the heating device shall be fitted outside the shell. For UN No. 3176 this requirement only applies when the substance reacts dangerously with water. TP27 A portable tank having a minimum test pressure of 4 bar may be used if it is shown that a test pressure of 4 bar or less is acceptable according to the test pressure definition in 6.7.2.1. TP28 A portable tank having a minimum test pressure of 2.65 bar may be used if it is shown that a test pressure of 2.65 bar or less is acceptable according to the test pressure definition in 6.7.2.1. TP29 A portable tank having a minimum test pressure of 1.5 bar may be used if it is shown that a test pressure of 1.5 bar or less is acceptable according to the test pressure definition in 6.7.2.1. TP30 This substance shall be carried in insulated tanks. TP31 This substance may only be carried in tanks in the solid state. TP32 For UN Nos. 0331, 0332 and 3375, portable tanks may be used subject to the following conditions:

(a) To avoid unnecessary confinement, each portable tank constructed of metal or fibre-reinforced plastics shall be fitted with a pressure-relief device that may be of the reclosing spring-loaded type, a frangible disc or a fusible element. The set to discharge or burst pressure, as applicable, shall not be greater than 2.65 bar for portable tanks with minimum test pressures greater than 4 bar.

(b) For UN No. 3375 only, the suitability for carriage in tanks shall be demonstrated. One method to evaluate this suitability is test 8 (d) in test series 8 (see Manual of Tests and Criteria, Part 1, Sub-section 18.7).

(c) Substances shall not be allowed to remain in the portable tank for any period that could result in caking. Appropriate measures shall be taken to avoid accumulation and packing of substances in the tank (e.g. cleaning, etc). TP33 The portable tank instruction assigned for this substance applies to granular and powdered solids and to solids which are filled and discharged at temperatures above their melting point which are cooled and carried as a solid mass. For solids which are carried above their melting point, see 4.2.1.19.

TP34 Portable tanks need not be subjected to the impact test in 6.7.4.14.1 if the portable tank is marked "NOT FOR RAIL TRANSPORT" on the plate specified in 6.7.4.15.1 and also in letters of at least 10 cm high on both sides of the outer jacket. TP35 Deleted. TP36 Fusible elements in the vapour space may be used on portable tanks. TP37, TP38 and TP39 (Deleted) TP40 Portable tanks shall not be carried when connected with spray application equipment. TP41 With the agreement of the competent authority, the 2.5 year internal examination may be waived or substituted by other test methods or inspection procedures, provided that the portable tank is dedicated to the carriage of the organometallic substances to which this tank special provision is assigned. However this examination is required when the conditions of 6.7.2.19.7 are met. TP42 Portable tanks are not authorized for the carriage of caesium or rubidium dispersions.