Is the roofless tank under positive pressure or negative pressure, and why?
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The degassing tank is under positive pressure. Why is it under positive pressure? Degassing is carried out by using a steam vacuum pump to create a vacuum: handshake
It is negative pressure because it acts as a buffer behind the vacuum
A reduced-head dirty oil tank is a positive-pressure tank, also known as a water seal tank, which serves to create a water seal and prevent air from being drawn in
The negative pressure in the top-reduction system does not include a water seal tank; it refers to the section above the atmospheric leg, while the water seal tank is a tank at atmospheric pressure
That means your vacuum system doesn’t have sufficient capacity or there is a problem with it
When there is no water seal at the top of the vacuum distillation tower, a negative pressure exists; when the vacuum level in the tower is high and the temperature is high, large amounts of air are drawn in, which can lead to an internal explosion. Therefore, a water seal is installed. Positive pressure is achieved once the water seal is properly established.
Slight positive pressure: All negative pressure areas are located above the water column in the atmospheric leg and before the outlet of the mechanical vacuum pump