How much pressure (absolute pressure) can be generated above the vent pipe of an oil-water separator, and how is it calculated?

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Let’s take a look at how much exhaust gas is produced at the water discharge point above the oil-water separation tank ? The image shows an oil-water separator: the upper phase is toluene, while the lower phase is water. The exhaust outlet at the top has a diameter of DN25. The temperature of the oil-water separator is 40 degrees Celsius, and the external atmospheric pressure is 1 atmosphere. The exhaust pipe is connected to the inlet of the fan; the fan has a volume flow rate of 1264 m3/h and a total pressure of 3597 Pa. At the fan’s inlet, there is a main exhaust pipe with a diameter of DN300, and the pressure loss across this pipe is around 2000 Pa. From there, another exhaust pipe leads to the oil-water separator, with a diameter of DN25. Questions: 1. What is the pressure (absolute pressure) that can be generated above the exhaust pipe of the oil-water separator? How can this be calculated?