Major hazard sources of level 3 and 4
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Is it necessary to install emergency shut-off valves on storage tanks designated as third- and fourth-level major hazard sources?
(1) Major hazard sources shall be equipped with continuous acquisition and monitoring systems for information such as temperature, pressure, liquid level, flow rate, and composition, as well as detection and alarm devices for leaks of flammable gases and toxic and harmful gases. These systems shall also have functions such as remote data transmission, continuous recording, accident early warning, and information storage； Primary or secondary major hazard sources are equipped with an emergency shutdown function. The electronic data recorded shall be retained for no less than 30 days ；
Generally, emergency shut-off valves are installed on storage tanks to prevent accidents; they allow for immediate shutdown when people cannot approach the tank.