For refrigerated liquefied gases, the escaping vapour shall be directed away from the tank and in such a manner that it cannot impinge upon the tank.

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.

4.2.4.2.4 Refrigerated liquefied gases are assigned to portable tank instruction T75.

and degree of filling requirements for non refrigerated liquefied gases permitted for transport in portable tanks.

Furthermore, the shell shall not be liquid full at 60 C.

(a) in an ullage condition liable to produce an unacceptable hydraulic force due to surge within the portable tank

This portable tank instruction applies to non refrigerated liquefied gases.

4.2.3 General requirements for the use of portable tanks for the transport of refrigerated liquefied gases

Portable tank means a multimodal tank having a capacity of more than 450 litres used for the transport of non refrigerated liquefied gases of Class 2.

4.2.2 General requirements for the use of portable tanks for the transport of non refrigerated liquefied gases

Non refrigerated liquefied gases shall be transported in portable tanks conforming to portable tank instruction T50 as described in 4.2.4.2.6 and any portable tank special provisions assigned to specific refrigerated liquefied gases in Column 11 of the Dangerous Goods List and described in 4.2.4.3.

4.2.1.10.1 All portable tanks intended for the transport of flammable liquids shall be closed and be fitted with relief devices in accordance with 6.6.2.8 to 6.6.2.15.

Tanks shall be hydraulically tested and internally inspected at intervals not exceeding 2.5 years.

For flammable non refrigerated liquefied gases, the escaping vapour shall be directed away from the shell in such a manner that it cannot impinge upon the shell.

(i) for a non refrigerated liquefied gas listed in the portable tank instruction T50 in 4.2.4.2.6, the MAWP (in bar) given in T50 portable tank instruction for that gas

Shell means the part of the portable tank which retains the non refrigerated liquefied gas intended for transport (tank proper), including openings and their closures, but does not include service equipment or structural equipment

Portable tank means a thermally insulated multimodal tank having a capacity of more than 450 litres fitted with service equipment and structural equipment necessary for the transport of refrigerated liquefied gases.

4.2.3.1 This section provides general requirements applicable to the use of portable tanks for the transport of refrigerated liquefied gases.

6.6.4 Requirements for the design, construction, inspection and testing of portable tanks intended for the transport of refrigerated liquefied gases

6.6.3.7.3 Portable tanks intended for the transport of certain non refrigerated liquefied gases identified in portable tank instruction T50 in 4.2.4.2.6 shall have a pressure relief device approved by the competent authority.

6.6.4.2.15 Portable tanks intended for the transport of flammable refrigerated liquefied gases shall be capable of being electrically earthed.

6.6.4.2.2 Any part of a portable tank, including fittings, gaskets and pipe work, which can be expected normally to come into contact with the refrigerated liquefied gas transported shall be compatible with that refrigerated liquefied gas.

These portable tank instructions apply to liquid and solid substances of Classes 3 to 9.

The shell design shall take into account the minimum MAWP values provided in portable tank instruction T50 in 4.2.4.2.6 for each non refrigerated liquefied gas intended for transport.

4.2.2.1 This section provides general requirements applicable to the use of portable tanks for the transport of non refrigerated liquefied gases.

6.6.3 Requirements for the design, construction, inspection and testing of portable tanks intended for the transport of non refrigerated liquefied gases

6.6.4.2.8 A reference holding time shall be determined for each refrigerated liquefied gas intended for transport in a portable tank.

Refrigerated liquefied gases shall be transported in portable tanks conforming to portable tank instruction T75 as described in 4.2.4.2.6 and the portable tank special provisions assigned to each substance in the Dangerous Goods List and described in 4.2.4.3.

4.2.2.7.2 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.

4.2.3.6.1 Prior to filling the shipper shall ensure that the portable tank is approved for the refrigerated liquefied gas to be transported and that the portable tank is not loaded with refrigerated liquefied gases which in contact with the materials of the shell, gaskets and service equipment, are likely to react dangerously with them to form dangerous products or appreciably weaken the material.

Filling density means the average mass of non refrigerated liquefied gas per litre of shell capacity (kg l).

Examples of test vessels are illustrated in Figure A5.1. Additional information may be obtained if the tank is mounted in a tray designed to collect any solids or liquids ejected.

6.6.3.2.5 The materials of the portable tank, including any devices, gaskets, and accessories, shall not adversely affect the non refrigerated liquefied gases intended for transport in the portable tank.

Shell means the part of the portable tank which retains the refrigerated liquefied gas intended for transport, including openings and their closures, but does not include service equipment or external structural equipment

This device should also prevent an unacceptable amount of leakage of liquid in the case of overturning or entry of foreign matter into the tank.

6.6.3.2.13 Portable tanks intended for the transport of flammable non refrigerated liquefied gases shall be capable of being electrically earthed.

6.6.3.6.1 Certain non refrigerated liquefied gases shall not be transported in portable tanks with bottom openings when portable tank instruction T50 in 4.2.4.2.6 indicates that bottom openings are not allowed.

4.2.2.7.1 Prior to filling the shipper shall ensure that the portable tank is approved for the non refrigerated liquefied gas to be transported and that the portable tank is not loaded with non refrigerated liquefied gases which in contact with the materials of the shell, gaskets and service equipment, are likely to react dangerously with them to form dangerous products or appreciably weaken the material.

(e) unless the actual holding time for the refrigerated liquefied gas being transported has been determined in accordance with 4.2.3.7 and the portable tank is marked in accordance with 6.6.4.15.2 and

This portable tank instruction applies to refrigerated liquefied gases. The general requirements of Section 4.2.3 and the requirements of Section 6.6.4 shall be met. 4.2.4.3 Portable tank special provisions

For tanks

Road tank vehicles, rail tank wagons, non metallic tanks and intermediate bulk containers (IBCs) are not considered to fall within the definition for portable tanks

(a) with a degree of filling, for liquids having a viscosity less than 2,680 mm2 s at 20 oC, 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

Design temperature range for the shell shall be 40 C to 50 C for non refrigerated liquefied gases transported under ambient conditions.

6.6.3.2.12 When the shells intended for the transport of non refrigerated liquefied gases are equipped with thermal insulation, the thermal insulation systems shall satisfy the following requirements