Should there be one or two safety valves?
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Can a safety valve be installed on a pressure vessel containing hazardous materials? Where is the regulatory basis?
Standards GB150-2011, HG/T20570
It mainly depends on the calculation of the discharge volume; generally, one container is sufficient, but for spherical tanks two containers are required, or as per other specified requirements
Design one for shutdown once a year; otherwise, design a backup safety valve.
One can be set up, or two can be used, or it can be used in combination with an explosion-proof film.
The design of safety valves, as well as the number of such valves to be installed, depends on the capacity of the system to be protected. According to design specifications, some equipment may require just one safety valve, while others may need two； When the system capacity of the equipment is large, some systems are equipped with 3 to 4 safety valves.
According to the Hazop risk analysis, whether 1 is sufficient to reduce risks also depends on the properties of your materials.
The refining industry typically installs dual safety valves, while chemical plants usually have only one. It still needs to be designed in accordance with the relevant specifications.
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