FIELD: mechanical engineering. SUBSTANCE: apparatus has a tank with a layer of petroleum, an intermediate layer and a water layer, inlet and outlet branch pipes. The apparatus also has an intermediate layer discharge device made in the form of a central hollow support of the tank with opposite nozzles. The hollow central support is tightly connected to a pump mounted outside the tank, and the nozzles are located in the zone the intermediate layer is positioned. EFFECT: improved structure. 2 dwg
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