Does the emergency shut-off valve for the loading pipeline in the tank farm require two-location interlock control?
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Dear experts: Is it necessary for the emergency shut-off valve of the loading pipeline in the tank farm to be controlled via two-location interlock? So both the emergency stop button and DCS manual control are needed? Which specification specifies it?
(1) Paragraph 5 of Article 6.4.2 of GB 50160-2008 (2018 edition): 5. When there are no buffer tanks in the station, an emergency shut-off valve that is easy to operate should be installed on the loading and unloading pipelines at a distance of more than 10 m from the loading and unloading cranes； (2) Article 11 of Document Lu An Ban Fa No. 26 from Shandong Province: Alarm information related to vehicles used for the loading and unloading of flammable liquids and liquefied hydrocarbons, such as static electricity grounding disconnection devices, overflow alarms, and detection alarms for flammable and toxic gases (including details like alarm time, location, and type), should be able to be integrated into process control systems or safety instrumented systems such as DCS, GDS, PLC, and SCADA. Similar provisions should be included in the **regulations and AQ-class standards regarding the safety management of chemical storage areas.
Local operation does not refer to controlling the solenoid valve, but rather the handwheel, used to manually close the valve