Abstract: The present invention is directed to a sandwich design crushing/shredding machine. The machine comprises a stationary grid and a rotatable set of blades on a shaft. The stationary grid is adapted for connection into a flow line, has a first flange and a second flange, and an attachment means attaching the first flange to the second flange in face-to-face relationship. The first flange has an open inner portion. The second flange has a grid inner portion of the same general shape as the open inner portion of the first flange, and a number of parallel grid openings. The attached first and second flanges have a bore extending diametrically through the flanges. A rotatable set of blades on a shaft extends axially through the bore, and is adapted for rotation by an exterior power source. Each blade corresponds to a grid opening and is positioned along the shaft within its grid opening.

Abstract: A crushing machine for insertion into a pipeline comprising a generally "T" pipe section containing a crushing cartridge - a plurality of crushing blades rotating within openings of a stationary bar/grid placed perpendicular to the flow in the pipeline. The crushing cartridge is completely removable as an single integral unit for quick and easy repair and reinstallation. A spare cartridge, fully adjusted and ready to use, may be installed while the removed cartridge is being serviced. The "T" pipe section may also be capped when the crushing mechanism is removed so that the pipeline flow may continue.