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Oil outlet function module of oil tank inlet and outlet dynamic safety management system
2021-10-09
The dynamic safety management function module of oil tank in the Mobile Big Data Management System for Oil Storage and Transportation developed by Shanghai Qingye Energy Co., Ltd. is a new functional module of oil tank dynamic safety management system in accordance with the regulatory documents and guidance on oil storage and transportation safety management issued by multiple national departments. The system function module is widely used in oil storage and transportation safety management systems such as oil crude oil storage and transportation, light oil storage and transportation, natural gas storage and transportation, oil storage and transportation of various refineries, etc.

Outlet function module:

When the oil outlet pump runs, the oil inlet pump stops, the oil outlet shut-off valve opens and the oil inlet shut-off valve closes.

The green oil is output outward through the oil outlet pump, and the liquid level of the oil tank decreases slowly. Due to the decrease of the liquid level, the pressure in the oil tank is low. At this time, nitrogen automatically enters the oil tank through the nitrogen sealing valve, so as to maintain the set positive pressure on the tank top At this time, the single call valve and safety relief valve on the tank top are closed. 

The pressure transmitter on the top of the oil tank is working and outputs the pressure signal.  If the tank top pressure is lower than the lower limit, the computer will give an alarm. If it is lower than the safety interlock value, it will immediately enter the safety interlock state and open the tank top safety relief valve.  The oil and gas connected with the tank top pipeline enters the tank to maintain the set positive pressure in the tank. At this time, if the tank top pressure still drops and reaches the set lower and lower limits, the air outside the tank enters the tank through the negative pressure breathing valve to make the pressure in the tank reach the set safety value and achieve the purpose of protecting the tank.

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