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.