6.6.2.8.4 Every portable tank with a capacity less than 1,900 litres shall be fitted with a pressure relief device which may be a frangible disc when this disc complies with the requirements of 6.6.2.11.1.

T absolute temperature in Kelvin ( C 273) above the pressure relief devices in the accumulating condition

No stop valve shall be installed between the shell and the pressure relief devices except when duplicate devices are provided for maintenance or other reasons and the stop valves serving the devices actually in use are locked open or the stop valves are interlocked so that the requirements of 6.6.4.7 are always fulfilled.

4.2.1.13.6 Portable tanks shall be fitted with pressure relief devices and emergency relief devices.

No stop valve shall be installed between the shell and the pressure relief devices except where duplicate devices are provided for maintenance or other reasons and the stop valves serving the devices actually in use are locked open or the stop valves are interlocked so that at least one of the duplicate devices is always in use.

B. Backlog of work

6.6.2.8 Pressure relief devices

6.6.3.7 Pressure relief devices

6.6.4.6 Pressure relief devices

4.2.1.13.7 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 oC.

Clearance of the backlog inventory

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

6.6.4.5.9 When pressure building units are used, the liquid and vapour connections to that unit shall be provided with a valve as close to the jacket as reasonably practicable to prevent the loss of contents in case of damage to the pressure building unit.

The Court has distinguished between temporary backlogs and organizationally in built backlogs.

6.6.3.8.1 The combined delivery capacity of the relief devices shall be sufficient that, in the event of total fire engulfment, the pressure (including accumulation) inside the shell does not exceed 120 of the MAWP.

No stop valve shall be installed between the shell and the pressure relief devices except when duplicate devices are provided for maintenance or other reasons and the stop valves serving the devices actually in use are locked open or the stop valves are interlocked so that at least one of the duplicate devices is always operable and capable of meeting the requirements of 6.6.3.8.

(c) the actual filling pressure

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

pressure_bar kPa gauge and degree of filling_ in kg for each refrigerated liquefied gas permitted for transport.

1 See for example CGA Publications S 1.2 2003 Pressure Relief Device Standards Part 2 Cargo and Portable Tanks for Compressed Gases and S 1.1 2003 Pressure Relief Device Standards Part 1 Cylinders for Compressed Gases .

B. Backlog clearance budget

C. Backlog clearance budget

6.6.4.7.1 In the case of the loss of vacuum in a vacuum insulated tank or of loss of 20 of the insulation of a tank insulated with solid materials, the combined capacity of all pressure relief devices installed shall be sufficient so that the pressure (including accumulation) inside the shell does not exceed 120 of the MAWP.

Pressure receptacles may not be equipped with any pressure relief device.

6.6.2.7 Safety relief devices

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X. Clearance of the backlog inventory

6.6.2.12.1 The spring loaded pressure relief device required by 6.6.2.8.1 shall have a minimum cross sectional flow area equivalent to an orifice of 31.75 mm diameter.

Unless a portable tank in dedicated service is fitted with an approved relief device constructed of materials compatible with the load, such device shall comprise a frangible disc preceding a spring loaded device.

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6.6.2.9 Setting of pressure relief devices

6.6.2.12 Capacity of pressure relief devices

6.6.2.13 Marking of pressure relief devices

6.6.2.14 Connections to pressure relief devices

6.6.2.15 Siting of pressure relief devices

6.6.3.8 Capacity of relief devices

6.6.3.9 Marking of pressure relief devices

6.6.3.10 Connections to pressure relief devices

6.6.3.11 Siting of pressure relief devices

6.6.4.9 Connections to pressure relief devices

6.6.4.10 Siting of pressure relief devices

Original stuff.

The initial degree of filling of 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 .

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Unless a portable tank in dedicated service is fitted with an approved relief device constructed of materials compatible with the load, the relief device shall comprise a frangible disc preceding a spring loaded pressure relief device.