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Safety Devices Reliefs, Fuse Plugs, RFOs, Etc

All DOT compressed gas cylinders use safety relief devices except those containing class A poison gases. In this case, the risk of exposure to the gas fumes is considered more hazardous than the chance of a cylinder failure. Gases that do not have pressure relief devices are usually allowed less maximum cylinder contents or use higher safety factor cylinders. [Pg.487]

Cylinders may have pressure relief devices incorporated in the cylinder valve, or in plugs in the cylinder proper, or a combination of both. Certain types of gas service or certain long cylinders may require pressure relief devices at both ends of the cylinder. DOT-required pressure relief devices must be approved by the Bureau of Explosives. [Pg.488]

There are four basic types of safety pressure relief devices in use. [Pg.488]

The spring-loaded safety reUef valve is most commonly used on low pressure Uquefied gas cylinders. The spring-loaded seat on this device will open to vent excess pressure, then reseal when the pressure drops somewhere below its original opening setpoint. [Pg.488]

The frangible disk is used mostly on high-pressure cylinders. This disk will burst, releasing the entire contents of the cylinder, at a pressure above the service pressure and above the hydrostatic test pressure of the cylinder. [Pg.488]




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