“An emergency shut-off valve that is easy to operate should be installed on the loading and unloading pipeline at a distance of more than 10m from the loading/unloading crane position”
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Must this shut-off valve be controllable remotely? Can a regular hand valve be used? I think since it’s said to be easy to operate, that means it should have a manual valve; distance doesn’t matter when it comes to \"ease of operation\", right?
In accordance with the above requirements, an easily operable emergency shut-off valve must be installed on the loading and unloading pipeline at a distance of more than 10m from the loading/unloading crane position. Emergency shut-off valves need to be able to quickly stop the flow of fluid in the pipeline to handle emergencies. Although remote control enables remote operation, the emergency shut-off valve is only required to be easy to operate; therefore, a standard hand valve can also meet the requirements. Operating with a hand valve is convenient; the operator can cut off the flow by manually rotating the valve, offering simplicity and reliability. .
Pneumatic, electric, or remotely controlled automatic on/off valves are available; remote control versions that are explosion-proof are difficult to implement, while electric explosion-proof valves are too expensive. Generally, pneumatic explosion-proof valves are used, as they can be controlled via SIS or DCS systems at a lower cost. Generally, leaks involve hazardous materials, and there is a risk associated with delays in having personnel close the manual valves; that’s why regulations require this approach
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“T∕CCSAS 023-2022 Standards for the Installation and Use of Emergency Shut-off Valves in Hazardous Chemicals Enterprises, section 5.6 on Hazardous Chemicals Loading and Unloading Facilities, provides clearer explanations that can be used as a reference.
It is generally recommended to choose pneumatic on-off valves with manual operation; this is the requirement here.
What was said upstairs is correct; emergency shutdown has two meanings: one is the possibility of performing it remotely in an emergency, and the other is the ability to carry out a safe shutdown promptly when it is detected on-site. It’s not just about personnel arriving at the site to operate.