Valve-related – is it stipulated that two safety valves must be installed?
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By analyzing the individual units, it was found that some of the vessels in certain devices are equipped with two safety valves, while others have just one. I couldn’t find an accurate answer by searching on my own. So, is there any relevant standard that specifies the required number of safety valves?
It is recommended to check the national standards regarding the general requirements for safety valves.
Are there any regulatory requirements? Currently, a single one is set up; I’d like to argue against that
The term \"two safety valves\" is itself ambiguous – are the two used as backups for each other, or are they used simultaneously?
Two safety valves are installed based on the emission levels and safety indices; these two valves have different setting pressures. In the event of overpressure, one valve opens first, and if the pressure does not drop, the second valve opens to continue releasing pressure. The specific standards for this are not clear, but those involved in the design of boilers and pressure vessels should be aware of the relevant guidelines.
Two are designed to ensure that one can still function in case the other fails; this is generally considered for devices that are relatively dangerous
TSG21-2016 Safety Technical Inspection Regulations for Fixed Pressure Vessels 9 Safety Accessories and Instruments
There is no regulation stating that two safety valves must be installed.
Take a look at the \"Regulations on the Installation of Safety Valves of Sinopec Group Corporation\".