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.

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

6.6.2.7.1 All portable tanks shall be fitted with at least one pressure relief device.

6.6.2.13.1 Every pressure relief device shall be plainly and permanently marked with the following

6.6.3.9.1 Every pressure relief device shall be plainly and permanently marked with the following

6.6.4.8.1 Every pressure relief device shall be plainly and permanently marked with the following

The device shall remain closed at all lower pressures. This requirement does not prevent the use of vacuum relief or combination pressure relief and vacuum relief devices.

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 .

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.

Frangible discs not in series with a spring loaded pressure relief device are not permitted.

There shall be no obstruction in an opening leading to a vent or pressure relief device which might restrict or cut off the flow from the shell to that device.

Protective devices which deflect the flow of vapour are permissible provided the required relief device capacity is not reduced.

When a frangible disc is inserted in series with the required pressure relief device, the space between the frangible disc and the pressure relief device shall be provided with a pressure gauge or suitable tell tale indicator for the detection of disc rupture, pin holing, or leakage which could cause a malfunction of the pressure relief system.

Replace CGA S 1.1 1994 with CGA S 1.1 2003 Pressure Relief Device Standards, Part 1, Cylinders for Compressed Gases .

The frangible disc shall rupture at a nominal pressure 10 above the start to discharge pressure of the relief device.

The frangible discs shall rupture at a nominal pressure 10 above the start to discharge pressure of the relief device.

The vacuum relief device shall be set to relieve at a vacuum setting not greater than minus ( ) 0.21 bar unless the shell is designed for a higher external over pressure, in which case the vacuum relief pressure of the device to be fitted shall be not greater than the tank design vacuum pressure.

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

6.6.2.14.1 Connections to pressure relief devices shall be of sufficient size to enable the required discharge to pass unrestricted to the safety device.

6.6.3.10.1 Connections to pressure relief devices shall be of sufficient size to enable the required discharge to pass unrestricted to the safety device.

6.6.4.9.1 Connections to pressure relief devices shall be of sufficient size to enable the required discharge to pass unrestricted to the safety device.

6.7.5.5.2 Replace CGA S 1.2 1995 with CGA S 1.2 2003 Pressure Relief Device Standards, Part 2, Cargo and Portable Tanks for Compressed Gases .

4.1.3.6.4 Unless otherwise indicated, pressure receptacles may be provided with an emergency pressure relief device designed to avoid bursting in case of overfill or fire accidents.

(d) when subjected to fire, is protected from rupture by means of a fire degradable seal or a pressure relief device to relieve internal pressure and

When no spring loaded pressure relief device is used, the frangible disc shall be set to rupture at a nominal pressure equal to the test pressure.

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.

The space between the frangible disc and the device shall be provided with a pressure gauge or a suitable tell tale indicator. This arrangement permits the detection of disc rupture, pinholing or leakage which could cause a malfunction of the pressure relief device.

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4.2.1.13.9 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.

Vents from the pressure relief devices, when used, shall deliver the relieved vapour or liquid to the atmosphere in conditions of minimum back pressure on the relieving device.

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