METHOD OF CLEANING INTERNAL SIDE OF PIPE Russian patent published in 1994 - IPC

FIELD: water supply. SUBSTANCE: pipe is filled with caustic fluid. Oscillations are excited within fluid from both ends of the pipe. One end of the pipe is coupled with an oscillation generator. Oscillations from the other end is excited alternately by coupling it with a cylinder filled with compressed air or by a deflector with density which is higher than fluid density. The deflector is positioned at fluid level. EFFECT: enhanced quality of cleaning. 1 dwg