High and low level discharge ports for refined oil storage tanks
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Commercial refined oil storage tanks typically have two discharge ports, one at the top and one at the bottom. Potential difference of 500 mm. One theory is that it is to prevent contamination of the discharged product by sediment at the bottom of the tank. Do anyone else have any other insights?
In refined oil products, the “lower discharge port” is usually used as a waste discharge outlet, while the “higher discharge port” is the actual oil outlet! ! ! Generally, only the \"discharge port\" is connected to the process pipelines; the others are equipped only with short pipes and valves (or blind plates, etc.)! ! ! ! :handshake :victory:
There may be oil residues or water in the refined oil storage tanks. Normally, the discharge outlet is at a certain distance from the bottom of the tank, while a sewage outlet is located at a lower position and is used for draining water or removing all the oil from the tank during cleaning.
The situation described by the original poster is very useful for manufacturing enterprises with smaller tank capacities that carry out frequent tank transfers. Due to insufficient settling time of the oil and incomplete dehydration, water often remains at the bottom of the tank. Therefore, we usually install an additional outlet about 800-1000 mm above the normal discharge port; this outlet is used during shipment to ensure that no water is present.
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The high discharge port is used under normal conditions, while the low discharge port is used when emptying the tank, in order to thoroughly remove debris and other substances from the bottom of the tank.
Thank you all for your answers. Personally, I think the answer for the fourth floor is the one that best matches reality. Because we have also designed a waste discharge port and a small extraction port for use in waste discharge and cleaning respectively.
We commonly refer to them as the high-level and low-level extraction ports. In daily use, the high-level extraction port is employed to prevent the removal of impurities and to avoid water contamination in the oil. The low-level extraction port is used in two situations: first, when emptying the tank to ensure that all oil at the bottom of the tank is removed; second, when the type of oil stored changes, for example, when 90# gasoline was stored before but now 93# gasoline is being stored； Another example: originally, diesel fuel was stored there, but now regular gasoline is stored there; it is generally necessary to use a low suction level, and try to drain out all the fuel that was previously stored there.
Personally, I think what was said on the fourth floor reflects the actual situation of the manufacturer