EP0180892B1 - Appareil d'électropolissage de la surface intérieure de tubes - Google Patents

Appareil d'électropolissage de la surface intérieure de tubes Download PDF

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Publication number
EP0180892B1
EP0180892B1 EP85113706A EP85113706A EP0180892B1 EP 0180892 B1 EP0180892 B1 EP 0180892B1 EP 85113706 A EP85113706 A EP 85113706A EP 85113706 A EP85113706 A EP 85113706A EP 0180892 B1 EP0180892 B1 EP 0180892B1
Authority
EP
European Patent Office
Prior art keywords
tube
heat exchanger
electrode
electropolishing
supporting frame
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired
Application number
EP85113706A
Other languages
German (de)
English (en)
Other versions
EP0180892A1 (fr
Inventor
Ludwig Dipl.-Ing. Voggenthaler (Fh)
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Siemens AG
Original Assignee
Siemens AG
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Siemens AG filed Critical Siemens AG
Publication of EP0180892A1 publication Critical patent/EP0180892A1/fr
Application granted granted Critical
Publication of EP0180892B1 publication Critical patent/EP0180892B1/fr
Expired legal-status Critical Current

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Classifications

    • C—CHEMISTRY; METALLURGY
    • C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
    • C25F—PROCESSES FOR THE ELECTROLYTIC REMOVAL OF MATERIALS FROM OBJECTS; APPARATUS THEREFOR
    • C25F3/00—Electrolytic etching or polishing
    • C25F3/16—Polishing
    • C—CHEMISTRY; METALLURGY
    • C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
    • C25F—PROCESSES FOR THE ELECTROLYTIC REMOVAL OF MATERIALS FROM OBJECTS; APPARATUS THEREFOR
    • C25F7/00—Constructional parts, or assemblies thereof, of cells for electrolytic removal of material from objects; Servicing or operating
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F22—STEAM GENERATION
    • F22B—METHODS OF STEAM GENERATION; STEAM BOILERS
    • F22B37/00—Component parts or details of steam boilers
    • F22B37/002—Component parts or details of steam boilers specially adapted for nuclear steam generators, e.g. maintenance, repairing or inspecting equipment not otherwise provided for
    • F22B37/003—Maintenance, repairing or inspecting equipment positioned in or via the headers
    • G—PHYSICS
    • G21—NUCLEAR PHYSICS; NUCLEAR ENGINEERING
    • G21F—PROTECTION AGAINST X-RADIATION, GAMMA RADIATION, CORPUSCULAR RADIATION OR PARTICLE BOMBARDMENT; TREATING RADIOACTIVELY CONTAMINATED MATERIAL; DECONTAMINATION ARRANGEMENTS THEREFOR
    • G21F9/00—Treating radioactively contaminated material; Decontamination arrangements therefor
    • G21F9/001—Decontamination of contaminated objects, apparatus, clothes, food; Preventing contamination thereof
    • G21F9/002—Decontamination of the surface of objects with chemical or electrochemical processes
    • G21F9/004—Decontamination of the surface of objects with chemical or electrochemical processes of metallic surfaces

Definitions

  • the invention relates to a device for electropolishing the inner surface of pipes with an electrode connected to a DC voltage source, which can be inserted into and removed from the pipe to be electropolished, according to the preamble of claim 1.
  • the electrode comprises a tubular body which can be connected to an electrolyte supply pump and which is metallically conductive on its outer surface carries, is provided in the vicinity of the plug with at least one outflow opening and is guided axially displaceably on a support device.
  • a support device is also shown, which is attached to the outside of the housing of the heat exchanger. The upper ends of the heat exchanger tubes are inserted into an open collecting container for the electrolyte liquid, which is connected to a storage container which feeds the supply line for the electrolyte supply via a pump.
  • a device for electropolishing the inner surface of U-shaped heat exchanger tubes has also become known, in which an electrode connected to a DC voltage source is inserted into one end of a heat exchanger tube. Here, electrolyte liquid is supplied from the other end of the heat exchanger tube. The electrode is then pulled out of the heat exchanger tube at a constant speed with the DC voltage switched on.
  • this known device for electropolishing the inner surface of U-shaped heat exchanger tubes the entire inner surface of such heat exchanger tubes can be cleaned and also decontaminated. It is a peculiarity of such a device that it is attached to both ends of a heat exchanger tube, i.e. must be connected in both bottom caps of a heat exchanger at the same time.
  • relatively large amounts of electrolyte liquid are required simply because of the filling of the entire heat exchanger tube and the relatively long hose lines.
  • the invention is therefore based on the object of developing a device for electropolishing the inner surface of pipes, in particular the ends of heat exchanger pipes, the handling of which is as simple as possible and whose electrolyte consumption can also be limited to smaller amounts in accordance with the smaller surfaces to be electropolished.
  • the total amount of electrolyte required is greatly reduced by the inventive design.
  • the device need only be connected to a single end of a heat exchanger tube. This alone halves the preparation time or set-up time compared to the known device.
  • the axial displaceability of the electrode on a carrying device at the same time facilitates the setting of the electropolishing depth and also the assembly of the device at the place of use.
  • a drainage tube can be passed concentrically through the electrode and through the stopper in a particularly expedient development of the invention. This ensures that excess electrolyte liquid can leak out of the section of the heat exchanger tube located above the pipe plug and that at the same time the attention of the operating personnel is drawn in this way to the leakage of the sealing plug. It is advantageous for the tight fit of the stopper in the tube to be electropolished if the stopper carries a seal which is in contact with the tube to be electropolished.
  • the electrode When electropolishing heat exchanger tubes, the electrode is protected against tilting, since it is guided on a support device that can be anchored to the tube plate of the heat exchanger. This measure also creates a prerequisite for the operating personnel to be able to move away from the vicinity of the tube sheet during electropolishing.
  • the carrying device forms the prerequisite for being able to fasten a leakage collecting container under the tube to be electropolished in an advantageous further development of the invention. This prevents dripping electrolyte liquid from getting into the bottom cap of the heat exchanger.
  • the figure shows a section of the tube sheet of a heat exchanger with the heat exchanger tubes opening into the tube sheet and the device according to the invention, introduced in one of these heat exchanger tubes, for electropolishing the inner surface of this heat exchanger tube.
  • the figure shows a section of the tube sheet 1 of a heat exchanger 2, which is not shown in the rest, with the heat exchanger tubes 3, 4, 5, 6 inserted into the bores of the tube sheet 1 and welded there with their ends.
  • the weld seams 7, 8, 9, 10 are shown clearly exaggerated.
  • the device 11 according to the invention for electropolishing is fastened to the tube sheet (1) by means of three pneumatic clamping fingers 12 (only one shown), each of which is inserted and clamped in a heat exchanger tube 3.
  • These pneumatic clamping fingers 12 are attached to a common adapter plate 13.
  • This adapter plate has a central opening 14 into which a guide bush 15 is inserted.
  • An insulating flange 16 which surrounds the guide bush 15 and is made of an insulating material, is also fastened on the adapter plate 13.
  • a holding flange 17 for the electrode 18 is fastened to this insulating flange 16.
  • This holding flange 17 has a central bore (19) in which one end of the electrode 18 is guided.
  • This electrode 18 comprises a metallically conductive tube piece 20 which is inserted into the heat exchanger tube 5 to be electropolished as far as the latter is to be electropolished.
  • the tube piece 20 carries a stopper 21.
  • This stopper 21 consists of two approximately discus-shaped halves 22, 23 made of insulating material.
  • a seal 24, an O-ring in the exemplary embodiment, is clamped between them.
  • the 0-ring lies against the inside diameter of the heat exchanger tube 5 to be electropolished.
  • These two halves 22, 23 of the plug 21 are pierced.
  • a drainage pipe 25 is guided through it and carries a tension nut 26 at its end.
  • the tube piece has a plurality of small holes 27, 28, 29, 30 at the end facing the stopper 21.
  • annular cavity 31 Between the tube piece 20 and the inside diameter of the holding flange 17 there is an annular cavity 31.
  • a further auxiliary flange 33 is seated on the holding flange 17 and likewise has a central bore of smaller diameter, in which the drainage tube 25 passing through the electrode is guided.
  • an electrolyte inlet fitting 35 opens into the auxiliary flange.
  • a clamping sleeve 38 with clamping nut 39 is screwed onto the drain pipe. The latter is supported on the clamping plate 37 of the clamping flange 36.
  • a return sleeve 41 which can be brought into contact with an O-ring 40 on the tube sheet 1 on the circumference of the tube 5 to be electropolished, can be seen between the adapter plate 13 and the tube sheet.
  • This return sleeve is guided in the guide bushing 15 in a liquid-tight manner and is pressed against the tube sheet 1 by a compression spring 42 supported on the adapter plate 13 with its tube sheet mouthpiece 43 carrying the 0-ring (40). It consists of electrically non-conductive material. It surrounds the pipe section 20 of the electrode with a predetermined distance and opens into the holding flange 17.
  • the return sleeve 41 is surrounded by an electrolyte collecting chamber 44 which is concentrically surrounding it and is fastened to the adapter plate 13. This electrolyte collection chamber 44 is connected to an electrolyte drainage nozzle 45 attached to the adapter plate.
  • the electrolyte return pipe 32, the electrolyte drain pipe 45 and the drain pipe 25 are each connected to an electrolyte reservoir 49 via a hose 46, 47, 48.
  • a circulating pump 50 for the electrolyte liquid is connected to this electrolyte reservoir, which is connected to the electrolyte inlet connection 35 via a further hose 51.
  • the DC voltage source 52 is also shown schematically with its positive pole connected to the tube sheet 1 and the negative coil connected to the holding flange 17.
  • a heat exchanger pipe If a heat exchanger pipe has leaked due to corrosion at one point, it can be repaired, among other things, by inserting a smaller SLEEVE pipe that bridges the damaged section.
  • the two ends of the SLEEVE pipe must be connected liquid-tight to the inner wall of the heat exchanger pipe.
  • Another repair measure would be to cut off this heat exchanger tube at its damaged end, to detach it from the tube sheet by grinding the weld seam on the tube sheet, to pull it out of the tube sheet and by means of a correspondingly long piece of replacement tube which would have to be welded to both the cut end of the heat exchanger tube and to the tube sheet, to replace. In both cases, welding has to be carried out and consequently the area of the weld seam has to be cleaned.
  • the oxide layer on the inner surface of the heat exchanger tube has to be separated here and cut open.
  • the electropolishing of the inner surface of the heat exchanger tube is suitable for this. Even if the radiation exposure for performing other work in the vicinity of the tube sheet of a heat exchanger, for example in the subsequent primary chamber of the steam generator, is to be reduced, the electropolishing of the ends of one or more heat exchanger tubes in the area of the tube sheet is expedient.
  • the device 11 for electropolishing is fastened to the tube sheet 1 by inserting the clamping fingers 12 located on the adapter plate 13 into the adjacent heat exchanger tubes 3 and bracing them in these heat exchanger tubes.
  • the adapter plate is pressed immediately before the hydraulic or electromechanical expansion of the clamping fingers 12 so far against the tube sheet 1 that the tube sheet mouthpiece 43 of the return sleeve 41 rests resiliently on the tube sheet 1, namely centrally to the heat exchanger tube 5 to be electropolished.
  • the electrode 18 together with the insulating flange 16, holding flange 17, auxiliary flange 33 and clamping flange 36 can be inserted into the heat exchanger tube 5 to be electropolished and screwed onto the adapter plate 13.
  • the length of the electrode 18 has already been adapted to the length of the electropolishing tube section. Also, the clamping nuts 26, 39 have been preloaded so far that the drainage pipe 25 with its clamping nut 26 pulls the two halves 22, 23 of the sealing plug 21 against the intermediate seal 24 and the metallically conductive pipe section 20 of the electrode 18.
  • the electropolishing can be started by switching on the DC voltage source 52.
  • fresh electrolyte is conveyed from the electrolyte reservoir 49 via the electrolyte circulation pump, via the electrolyte inlet connection 35, the cavity 34 of the auxiliary flange 33 and from there between the drain pipe 25 and the pipe section 20 of the electrode 18 up to the stopper 21.
  • the fresh electrolyte liquid emerges through the holes 27 to 31 located directly in front of the plug 21 in the pipe section 20 and now flows back between the pipe section 20 and the wall of the heat exchanger pipe 5 to be electropolished.
  • the oxide layer on the inner wall of the heat exchanger tube 5 is removed and the removed particles, together with the downward flowing electrolyte liquid, reach the electrolyte return nozzle and from there the hose 46 into the electrolyte reservoir 49.
  • Electrolyte liquid emerging at the 0-ring (40) of the tube plate mouthpiece 43 also runs back into the electrolyte collecting chamber 44 and via the electrolyte drainage connection connected to the electrolyte collecting chamber back into the electrolyte collecting container 49. From there it can be pumped again into the electrolyte inlet connection by the circulation pump 50.
  • the electropolishing process i.e. After a period of time which is dependent on the layer thickness to be removed and the current intensity switched on, the DC voltage source 52 and the circulation pump 50 are switched off. As soon as the pneumatic clamping fingers 12 are relaxed, the entire electropolishing device 11 can be pulled out of the tube sheet 1 from below and, in the same way, brought back to another heat exchanger tube to be electropolished and locked there.

Claims (5)

1. Dispositif pour réaliser l'électropolissage de la surface intérieure de tubes, et comportant une électrode raccordée à une source de tension continue, pouvant être insérée dans le tube devant être soumis à l'électropolissage et pouvant en être à nouveau retirée, et dans lequel l'électrode (18) comporte un corps tubulaire (20), qui peut être raccordé à une pompe (50) d'alimentation de l'électrolyte, est métallique et conducteur au niveau de sa surface extérieure et porte, sur son extrémité avant dans la direction d'insertion, un bouchon (21) fermant d'une manière étanche aux liquides le tube (5) devant être soumis à l'électropolissage, comporte, à proximité du bouchon, au moins une ouverture de sortie (27 à 30) et est guidé avec possibilité de déplacement axial le long d'un dispositif de support (12 à 17), caractérisé par le fait que, pour réaliser l'électropolissage de tubes (3 à 6) d'un échangeur de chaleur, le dispositif de support (12 à 17) peut être accroché sur la plaque porte-tubes (1) de l'échangeur de chaleur (2) et qu'un manchon de reflux (41), qui entoure l'électrode (18) est guidé d'une manière étanche aux liquides sur une plaque d'adaptation (13) du dispositif de support et est repoussé, par une embouchure (43), contre la plaque porte-tubes (1), par l'intermédiaire d'un ressort (42) qui prend appui contre le dispositif de support (12 à 17).
2. Dispositif d'électropolissage suivant la revendication 1, caractérisé par le fait qu'un tube d'évacuation (25) traverse, dans une position concentrique, l'électrode (18) et le bouchon (21
3. Dispositif suivant la revendication 1, caractérisé par le fait qu'un récipient (44) de collecte des fuites peut être fixé en position centrée par rapport à l'électrode (18), sur le dispositif de support (12 à 17).
4. Dispositif suivant la revendication 1, caractérisé par le fait que le dispositif de support (12 à 17) peut être fixé sur la plaque porte-tubes (1) par l'intermédiaire de doigts de serrage (12) pouvant être bloqués par serrage dans les embouchures de tubes voisins (3 à 6) de l'échangeur de chaleur.
5. Dispositif suivant la revendication 1, caractérisé par le fait que, pour réduire la durée d'usinage, on enroule préalablement une bande isolante autour des parties du corps tubulaire conducteur métallique (20) de l'électrode (18), qui sont situées en vis-à-vis de parties de la paroi du tube (5) de l'échangeur de chaleur, qui n'ont pas besoin d'être soumises à l'électropolissage.
EP85113706A 1984-11-09 1985-10-28 Appareil d'électropolissage de la surface intérieure de tubes Expired EP0180892B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3440956 1984-11-09
DE3440956 1984-11-09

Publications (2)

Publication Number Publication Date
EP0180892A1 EP0180892A1 (fr) 1986-05-14
EP0180892B1 true EP0180892B1 (fr) 1988-08-31

Family

ID=6249891

Family Applications (1)

Application Number Title Priority Date Filing Date
EP85113706A Expired EP0180892B1 (fr) 1984-11-09 1985-10-28 Appareil d'électropolissage de la surface intérieure de tubes

Country Status (3)

Country Link
EP (1) EP0180892B1 (fr)
DE (1) DE3564708D1 (fr)
ES (1) ES8701243A1 (fr)

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB8719816D0 (en) * 1987-08-21 1987-09-30 Sb Plating Ltd Electro-plating techniques
FR2652191B1 (fr) * 1989-09-15 1991-12-13 Framatome Sa Dispositif de mise en contact d'un liquide de traitement avec une zone de la surface interieure d'un tube et procede de mise en place de ce dispositif dans le tube.
US5225645A (en) * 1990-07-02 1993-07-06 Combustion Engineering, Inc. Electron discharge machining tool
FR2705825B1 (fr) * 1993-05-28 1995-08-18 Framatome Sa Dispositif de décontamination de la surface interne d'un tronçon d'extrémité d'une canalisation.
JP2012040674A (ja) * 2010-08-23 2012-03-01 Mitsubishi Heavy Ind Ltd クランパ、水室内作業装置およびクランプ方法
CN107151816B (zh) * 2017-06-02 2019-07-02 无锡市鹏振智能科技有限公司 一种电解抛光方法

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2764540A (en) * 1952-09-10 1956-09-25 William G Farin Method and means for electropolishing inner surfaces
CH396561A (de) * 1960-10-06 1965-07-31 Nyby Bruk Ab Verfahren zum elektrolytischen Polieren von Oberflächen metallischer Gegenstände
US3202598A (en) * 1963-03-22 1965-08-24 Titanium Metals Corp Electrolytic polishing tool
DE1496757A1 (de) * 1965-06-04 1969-08-14 Contimet Gmbh Werkzeug zum elektrolytischen Glaetten der Innenflaeche von metallischen Rohren
CH567581A5 (fr) * 1971-09-18 1975-10-15 Siemens Ag
DE3136187C2 (de) * 1981-09-12 1988-08-18 Kernforschungszentrum Karlsruhe Gmbh, 7500 Karlsruhe Verfahren und Vorrichtung zur Reinigung der Innenwände von metallischen Leitungssystemen durch Elektropolieren mit Hilfe bewegter Elektroden
FR2544343A1 (fr) * 1983-04-18 1984-10-19 Sfermi Appareil pour decontaminer par electropolissage l'extremite d'un tube metallique creux

Also Published As

Publication number Publication date
EP0180892A1 (fr) 1986-05-14
ES548722A0 (es) 1986-11-16
DE3564708D1 (en) 1988-10-06
ES8701243A1 (es) 1986-11-16

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