Attention is drawn to the minimum shell thickness requirements for these shells specified in 6.6.3.4.

6.6.4.4.4 For vacuum insulated tanks, the aggregate thickness of the jacket and the shell shall correspond to the minimum thickness prescribed in 6.6.4.4.2, the thickness of the shell itself being not less than the minimum thickness prescribed in 6.6.4.4.3.

Attention is drawn to the minimum shell thickness requirements for these tanks specified in 6.6.2.4.1 to 6.6.2.4.10.

6.6.2.2.11 Vacuum relief devices used on portable tanks intended for the transport of substances meeting the flash point criteria of Class 3, including elevated temperature substances transported at or above their flash point, shall prevent the immediate passage of flame into the shell, or the portable tank shall have a shell capable of withstanding, without leakage an internal explosion resulting from the passage of flame into the shell.

If the SADT of the organic peroxide in the portable tank is 55 C or less, or the portable tank is constructed of aluminium, the portable tank shall be completely insulated.

41.3.7 Alternate test severity validation method for portable tanks with frame length of 20 feet

4.2.1.13.5 Portable tanks shall be fitted with temperature sensing devices.

the partial pressure (in bar) of air or other gases in the ullage space being determined by the design reference temperature and the liquid phase expansion due to the increase of the mean bulk temperature of tr tf (tf filling temperature, usually 15 C, tr 50 C maximum mean bulk temperature).

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

The filling density is given in portable tank instruction T50 in 4.2.4.2.6.

(ii) the partial pressure (in bar) of air or other gases in the ullage space being determined by a maximum ullage temperature of 65 C and a liquid expansion due to an increase in mean bulk temperature of tr tf (tf filling temperature, usually 15 C tr 50 C, maximum mean bulk temperature).

(a) Portable tanks The tank shall be filled with water or any other non pressurized substance to approximately 97 of the tank volumetric capacity.

This value for each portable tank type is as follows

(ii) the partial pressure (in bar) of air or other gases in the ullage space being determined by a maximum ullage temperature of 65 C and a liquid expansion due to an increase in mean bulk temperature of tr tf (tf filling temperature usually 15 C tr 50 C maximum mean bulk temperature) and

(b) when leaking

When for reasons of portable tank arrangements the plate cannot be permanently attached to the shell, the shell shall be marked with at least the information required by the pressure vessel code.

When for reasons of portable tank arrangements, the plate cannot be permanently attached to the shell, the shell shall be marked with at least the information required by the pressure vessel code.

In the case of multi purpose tanks, the combined delivery capacity of the pressure relief devices shall be taken for the gas which requires the highest delivery capacity of the gases allowed to be transported in portable tanks.

(c) the minimum thickness specified in the applicable portable tank instruction in 4.2.4.2.6 or by a portable tank special provision indicated in Column 11 of the Dangerous Goods List.

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

4.2.1.9.1.1 Portable tanks shall not be filled above the extent provided in 4.2.1.9.2 to 4.2.1.9.6.

Portable Tanks

Fusible elements used on portable tanks intended for the transport of elevated temperature substances shall be designed to operate at a temperature higher than the maximum temperature that will be experienced during transport and shall be to the satisfaction of the competent authority or its authorized body.

4.2.1.13.2 The following requirements apply to portable tanks intended for the transport of organic peroxides (Type F) with a Self Accelerating Decomposition Temperature (SADT) of 55 oC or more.

F for insulated vessels

6.6.2.18 Design approval

6.6.3.14 Design approval

6.6.4.13 Design approval

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.

6.6.2.4 Minimum shell thickness

6.6.3.4 Minimum shell thickness

6.6.4.4 Minimum shell thickness

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.

6.6.3.7.4 In the case of multi purpose portable tanks, the pressure relief devices shall open at a pressure indicated in 6.6.3.7.1 for the gas having the highest maximum allowable pressure of the gases allowed to be transported in the portable tank.

4.2.1.9.5 The requirements 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 ºC during transport (e.g. by means of a heating device).

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.

Example 1 insulated tank

for insulated vessels. (2)

(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

6.6.2.4.7 When in the applicable portable tank instruction in 4.2.4.2.6, a minimum thickness of 8 mm, 10 mm or 12 mm is specified, it shall be noted that these thicknesses are based on the properties of the reference steel and a shell diameter of 1.80 m.

6.6.2.6.2 Bottom discharge outlets for portable tanks carrying certain solid, crystallizable or highly viscous substances shall be equipped with not less than two serially fitted and mutually independent shut off devices.

The portable tank includes a shell fitted with service equipment and structural equipment necessary for the transport of gases.

F 1 for non insulated vessels, or

GE.97 20484 page CHAPTER 4.2 USE OF PORTABLE TANKS