The possibility of using hydrocyclone plants for cleaning used oils is considered. The dependence of the degree of purification of waste oil on insoluble impurities is determined theoretically, determined by the mass content of particles in the oil flow removed through the lower drainage hole, from the time of the particle in the hydrocyclone and the radius of the surface of zero axial velocity, which determines the separation of the oil flow and the entrainment of particles through the upper or lower discharge holes.
TO THE QUESTION OF CLEANING OF EXHAUST OIL FROM NON-SOLUBLE IMPURITIES IN A HYDROCYCLONE