Relief valves are an important safety feature in industrial ammonia refrigeration systems. They protect the system from over pressurization and possible explosion. The discharge piping is an important part of the relief valve system, which must be sized properly so the relief valve capacity is not affected, and it must route the ammonia to a safe discharge location.


EPA defines the relief system as including, but are not limited to, relief valves, relief headers, relief drums, and rupture disks. Design basis means documenting how the loads and sizes of the relief system, as well as inlet and outlet sizes, were determined. This includes a description of overpressure scenarios considered, the scenario that creates the largest load to be relieved, the assumptions used, and if the device meets a certain code.


When our engineers come onsite, they will gather the information to assist them in creating a schematic of the RV system. The calculations will show if the piping branch and/or headers are properly sized for the relief valves in the system. The Relief valves will also be documented to indicate if they are properly sized for the vessel or piping. The finished report will include the schematic along with the results of the calculations of your relief system.

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