DEVICE FOR CLEANING INNER SURFACE OF PIPES OF WORKING GAS MAIN Russian patent published in 1994 - IPC

FIELD: cleaning equipment. SUBSTANCE: device has a hollow container with flexible glands and a branch pipe which one end is passed through a hole in the back wall of the container. The other end of the branch pipe is located above the lower part of the inner surface of the cleaned pipe. Moreover, the front wall of the container has a lot of holes which total area exceed the branch pipe cross section by a factor of 10. EFFECT: improved structure. 2 cl, 3 dwg