Oxygen pressure relief devices

A Pressure Relief Device (not shown) is required by NFPA 86 (sect. 4-4.3.12) whenever it is possible to have an event leading to an oxygen supply pressure that is greater than the MAWP (maximum allowable working pressure) of any of the components or piping within the oxygen pipeline. The pressure relief device must be sized properly per manufacturer and industry standards. The outlet of the pressure relief device must be piped to a safe location per NFPA 86 (sect. 4-4.3.7). 

At least one pressure relief device is required on any compressed gas cylinder or trailer tube offered for transport of oxygen. A pressure relief device must be selected in accordance with CGA S-1.1, Pressure Relief Device Standards—Part 1—Cylinders for Compressed Gases, [14]... 

Types of pressure relief devices used on oxygen cylinders include the CG-1 rupture disk, the CG-4 and CG-5 combination rupture disk/fusible plug devices, and the CG-7 pressure relief valve. [14] See CGA S-1.1, Pressure Relief Device Standards—Part 1— Cylinders for Compressed Gases, for further information and requirements. 

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