Abstract: A self propelled tube bundle extractor includes a mainframe which has four hydraulically actuated wheel assemblies for propulsion and steering. An extraction frame is mounted on the main frame and is operable to translate in three directions, up and down, forward and backward, and side to side, independent of the movement of the main frame. The vertical movement of the extraction frame is established by at least two telescoping lifting columns.

Abstract: A positive displacement device utilizing at least two rotors which roll sealingly on one another at a common pitch surface speed. Outwardly extending lobes on one rotor sealing engage the cylindrical bore of the housing of the device, fluid traversing the device circumferentially in the annulus between such bore and the pitch surface of the rotor. Speed of rotation of the two rotors is controlled by a timing chain running between sprockets mounted on the rotor shafts.When the lobe passes the line of sealing contact, a cavity is provided in the meshing rotor, and the lobe makes sealing contact with the wall of this cavity during at least that interval when there is no sealing contact between the pitch surfaces, i.e., the interval when the mouth of the cavity is passing through dead center.

Abstract: The invention operates on a bundle of cooling tubes which in use are disposed within a heat exchanger shell which is typically a longitudinally elongated cylinder disposed with its long axis horizontal and supported well above a floor, on a steel framework. The array of tubes become corroded and clogged after a period of use, either internally, externally, or both, and must be pulled linearly out of the shell for replacement. Typically the initial pulling is a difficult job because the tubes have become tightly corroded to the shell.Herein is disclosed an improvement to the type of tube bundle extractor in which the operative unit is a car movable along a pair of rails supported in alignment with the heat exchanger, the rails being supported on a framework which is usually suspended from a crane hook, the framework being secured to one end of the heat exchanger during a bundle pulling or bundle inserting step.