Please tell me, if there is oil in the tank and there is a pump outside to pump out the oil, what pressure and pipeline DN are needed to maintain the nitrogen pressure?
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I would like to ask, there is oil in the tank, and there is a pump outside to pump out the oil. The flow rate is 5000L/h. The upper part of the tank is connected to a nitrogen pipe. What diameter of the pipe is needed and what is the working pressure of the nitrogen so that the oil tank will not be flattened?
No, just maintain positive pressure
But why don't tanks do this instead of using a nitrogen sealing valve system?
Do you still need to check the pump when it is empty? If you don’t check it, it won’t be empty.
The tank is sealed. If the oil is pumped out, the remaining part will be a vacuum. The inside of the tank will become negative pressure and may be crushed. The customer wants to use a local method to directly connect the nitrogen tank to adjust the pressure in the tank and seal it with nitrogen. However, in the past, this was adjusted by the nitrogen sealing valve system.
If you can let air in and add a breathing valve, you'll be fine.
The nitrogen self-operated regulating valve can be installed on the top of the tank. Can maintain positive pressure in the tube
Maintaining a slightly positive pressure in the tank will prevent the tank from flattening. I have an example here. The nitrogen in the tank is pressurized and the oil is pushed out directly without the need for a pump.
Adding a self-operated regulating valve to control nitrogen is simple, convenient, safe and reliable.