Abstract: A method of inserting a sensor into a pipeline including the steps of securing a fitting onto the pipeline, tapping an opening in the pipeline through the fitting, installing a housing on the fitting, the housing having a nipple extending at an angle to the pipeline, attaching a sensor insertion assembly to the nipple, the insertion assembly having a launch tube movable axially between the insertion assembly and the pipeline, extending the launch tube from the insertion assembly and through the pipeline opening into the pipeline, the launch tube intersecting the pipeline at an acute angle and providing communication between the sensor insertion assembly and the interior of the pipeline, and passing a sensor from the insertion assembly and through the launch tube into the pipeline.

Abstract: A magnetic disc for a cleaning device which is passed through a pipeline having a cylindrical internal wall. The magnetic disc includes a flexible circular disc body perpendicular to the cylindrical wall, the disc body having a plurality of radially spaced openings therethrough. A magnet is installed in each opening in the disc body, each magnet having poles oriented axially with the cylindrical wall. A pair of opposed retainer plates for each magnet are fastened to the disc body to retain the magnet in the disc body and to extend the magnetic field of action.