Is the decanting oil-water separation tank also vacuum?
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I have a gentle question: is the degassing and water separation tank also under vacuum? Is it still connected to the atmosphere? How are water and oil separated inside the tank? :L
You’ll understand if you look at a schematic diagram. A certain water level is maintained (through instruments or the inverted U-shaped tube of a rupture valve); the water surface is in contact with the atmosphere, thus maintaining atmospheric pressure. An air leg is inserted into the water to maintain a water seal. There is a partition nearby, and after oil and water settle and separate, the oil stays on top; any oil that exceeds the height of this partition flows into the fuel tank, where it is pumped out.
This post was last edited by lyhgchem on 2010-4-25 00:21. 1. In other words, the height of the water must absolutely not exceed the height of the partition. 2. So, how high should the height of the inverted U-tube be compared to that of the tank?
1. If the water level is higher than the partition, it overflows to the dirty oil side and is pumped out. 2. The height of the U-tube is slightly higher than that of the partition, ensuring the integrity of the water seal while preventing dirty oil from entering the drainage system.
This post was last edited by lyhgchem on 2010-4-25 09:15. 1. Where do the products from the roofless tank come from? 2. Is the highest point of the inverted U-tube (the middle part of the inverted U) slightly higher than the highest point of the oil separator plate, or slightly lower?
1# lyhgchem: Change the pressure-reducing water seal tank to atmospheric pressure! There is also a high-level vent on the water seal tank!
If it is to reduce the vacuum in the water seal tank, then what’s the need for a atmospheric leg?
On the 7th floor, it can also be a vacuum, but the negative pressure shouldn’t be too high.
It’s a slight positive pressure; otherwise, how can the exhaust gas from the top and bottom be expelled?
The tank is not likely to be in a vacuum; the oil at the top has to flow down through a 10-meter tall atmospheric column, which indicates that the pressure at the bottom is on the order of one atmosphere. The tank has partitions; oil is lighter than water, so when it fills up, it flows over the partitions into the adjacent area and is pumped out from below.
It should be a slight positive pressure. For the gas after pressure reduction, there is no separate transportation equipment whether it is sent to a flare or to a heater for combustion, and the pressure reduction tower operates on a continuous basis; only when an excess amount of oil and gas accumulates at the top of the tower does pressure build up enough to drive the flow to the subsequent stages.