Abstract: Method for electropolishing the inner surface of an U-shaped heat exchanger tube with an electrode connected to a negative pole of a d-c voltage source, the electrode being slidable into the heat exchanger tube and withdrawable out of the tube by a pulling member, and with a pump connected to an electrolyte tank for feeding electrolyte into the heat exchanger tube, which comprises inserting into two chambers, respectively, formed in a bottom hemispherical shell of a heat exchanger, respective manipulators formed with jibs for positioning tube probes by remote control into end openings of U-shaped heat exchanger tubes disposed in the heat exchanger and opening into the chambers; pressing by the manipulators respective adapters, which are connected to hose connectors and are carried at respective free ends of the manipulator jibs, to the end openings of the heat exchanger tubes through the intermediary of respective seals so as to align in each of the chambers the end opening of one of the U-shaped heat exchang

Abstract: Tube lane manipulator for the high-pressure blowdown of heat exchangers having tubes being spaced apart by a given pitch forming tube lanes therebetween with tubes on opposite sides and having closeable servicing openings formed therein providing access to the tube lanes, including a car being insertible into the tube lanes through the servicing openings and being movable therein by remote control, a spraying head being supported on the car and having nozzles with orifices for spraying jets of blowdown water in a given direction into spaces between the tubes, suction lines having suction stubs for pumping off accumulated blowdown water, and extendible and retractible clamping feet disposed on the car for clamping the car to the tubes on at least one side of a tube lane along a clamping plane in conformity with the given tube pitch, the nozzles being positioned in spraying positions of a spraying position sequence by the clamping feet clamping the car, the given spraying direction from the orifices of the nozz

Abstract: A tube lane manipulator assembly for the high-pressure blowdown of heat exchangers of steam generators includes a manipulator, at least one vehicle disposed on the manipulator having a lower base body with a substantially rectangular cross section, a spraying head with nozzles on the vehicle, the vehicle being insertible into tube lanes of the tubes of the generator through service openings and being movable in the tube lanes by remote control, the spraying head being movable into position for spraying jets into interspaces between the tubes, at least two clamping legs disposed in tandem in the feed direction on a side of the vehicle for clamping the vehicle to the tubes in conformity with a tube pitch in a clamping plane on at least one side of the tube lane for positioning the nozzles in spraying positions, the spraying direction of the nozzles and the distance thereof from the clamping plane being matched to the tube pitch for directing the spray jets into the interspaces, and at least one L-shaped guide r

Abstract: Repair plug for sealing heat exchanger tubes, including a closure plug part being tightly connectable to a heat exchanger tube and having an end for insertion into the heat exchanger tube, and a polisher plug part disposed on the insertion end of the closure plug part axially in front of the insertion end in insertion direction thereof forming a single structural unit with the closure plug part, the polisher plug part remaining in the sealed heat exchanger tube after completing the tight connection.

Abstract: Inspection and testing device for the bottoms of reactor pressure vessels, including an insulation layer and a shielding layer enclosing the pressure vessel, a track fitted to the bottom of the pressure vessel having a first part fixed to the bottom of the pressure vessel and a second part detachable from the first part and passing through the insulation and shielding layers, the second part having a substantially horizontal end region disposed outside the shielding layer, and including a testing and inspection device connected to the track for inspecting and testing the bottom of the pressure vessel.

Abstract: Inspection device for testing vessels surrounded by a wall having an inner and an outer surface including a movable testing device and a track for guiding the testing device. The guiding track extending from a portion disposed in the vicinity of the vessel between the wall and the vessel, through a U-shaped portion over the wall and ending at a rest position for the testing device on the outer surface of the wall.