Regarding emergency shut-off devices for chemical storage tanks
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Document No. 3 (2014) 68 issued by the Chief Safety Officer stipulates that \"automatic interlock shutdown of material transfer in case of an abnormally low liquid level\" – what is the significance of this from a safety perspective?
The ultra-low liquid level interlock shuts off the valve and stops the pump to prevent dry running and cavitation
In that case, it’s sufficient to simply stop the pump, right? Is it not necessary to install a shut-off valve?
To prevent the tank from being emptied to a negative pressure, the flow rate of the breathing valve is not sufficient to match that of the pump.
This is to stop the pump and close the valves.
The main thing is to prevent the floating disc from sinking to the bottom and creating an explosive oil and gas space!
Yes, in many tank systems, the pumps are directly interlocked to stop when the liquid level drops
Prevent tank breathing valve failures from causing the tank to collapse, and prevent floating roofs on tanks from falling to the bottom, thereby avoiding the creation of explosive gas-oil mixtures；