according to the drawing standard GB/T 51116-2111 for water supply and drainage, YC stands for oil removal tank, which is square with a partition in the middle, and that stands for oil separation tank.

oil separator explanation:

it is a treatment structure that uses the difference of specific gravity between oil and water to separate and remove suspended oil with large particles in sewage.

The petroleum industry and petrochemical industry discharge wastewater containing a large amount of oil products in the production process; The coking and gasification industries of coal discharge wastewater containing high concentration of tar; Wool spinning industry and meat industry discharge wastewater containing more oil.

If these oily wastewater is discharged into water, it will cause pollution, and irrigating farmland will block soil pores and be harmful to crop growth. If the oil in wastewater is recycled, it will not only avoid environmental pollution, but also obtain considerable economic benefits.