EP0074463B1 - Method and apparatus for cleaning the inner walls of metallic tubular systems by electropolishing by means of moving electrodes - Google Patents

Method and apparatus for cleaning the inner walls of metallic tubular systems by electropolishing by means of moving electrodes Download PDF

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Publication number
EP0074463B1
EP0074463B1 EP82104945A EP82104945A EP0074463B1 EP 0074463 B1 EP0074463 B1 EP 0074463B1 EP 82104945 A EP82104945 A EP 82104945A EP 82104945 A EP82104945 A EP 82104945A EP 0074463 B1 EP0074463 B1 EP 0074463B1
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EP
European Patent Office
Prior art keywords
high pressure
electrode
pipework
metallic
nozzle
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
EP82104945A
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German (de)
French (fr)
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EP0074463A1 (en
Inventor
Manfred Kienhöfer
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Forschungszentrum Karlsruhe GmbH
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Kernforschungszentrum Karlsruhe GmbH
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Publication of EP0074463A1 publication Critical patent/EP0074463A1/en
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    • 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
    • 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
    • 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
    • G21F9/005—Decontamination of the surface of objects by ablation

Definitions

  • the invention relates to a method for cleaning the inner walls of metallic line systems by electropolishing with the aid of moving electrodes, in which the electrolyte is filled into the line system, and a device for carrying out the method.
  • the invention has for its object to provide a method and an apparatus with which (which) a metallic pipe system can be cleaned without having to disassemble it.
  • Under piping system should be understood here: a system of straight and curved pipes, including the associated shut-off devices, such as. B. ball valves, slide or the like.
  • the process should also be able to successfully clean rising and falling pipes immediately.
  • the method and the device should be usable in particular for the decontamination of radioactive contaminated line systems.
  • the object is achieved in that the electrolyte is applied by means of high pressure of approximately 5 MPa or more to a section of the wall of the line system, and that the cathode is moved in the line system with the aid of the high pressure jet.
  • the device according to the invention for carrying out the method is characterized by an elastic high-pressure hose with a metallic stabilizing element serving as a current conductor or with a metallic strand serving as a current conductor, which is provided at its end with a high-pressure nozzle with a plurality of openings arranged radially and at an angle to the inner wall of the line system and by an elastic, metallic electrode which is arranged around the end piece of the high-pressure hose and connected to the current conductor, and by several insulating spacers which are arranged on the high-pressure hose in a fixed or displaceable manner, at least in the electrode area.
  • the electrode of the device according to the invention can be designed as a spiral cathode or as a coiled strip.
  • the electrolyte to be used is thrown through the high-pressure jet nozzle at a pressure from approx. 5 MPa to approx. 60 MPa onto the inner wall of the tube.
  • the independent forward movement of the electrode inside the tube is achieved by the electrolyte jets directed obliquely against the tube wall.
  • the electrolyte rays allow the current to pass through. A current between 300 and 400 amperes is sufficient in most cases.
  • a decontamination factor of 300 was achieved, which could be increased by a factor of 10 after the inner wall 2 of the pipe had been sprayed again with warm water and high pressure, so that a total decontamination factor of 3,000 was achieved.

Description

Die Erfindung betrifft ein Verfahren zur Reinigung der Innenwände von metallischen Leitungssystemen durch Elektropolieren mit Hilfe bewegter Elektroden, bei weichem der Elektrolyt in das Leitungssystem eingefüllt wird, und eine Vorrichtung zur Durchführung des Verfahrens.The invention relates to a method for cleaning the inner walls of metallic line systems by electropolishing with the aid of moving electrodes, in which the electrolyte is filled into the line system, and a device for carrying out the method.

Das Entfernen von Verunreinigungen von metallischen Oberflächen, die schwer zugänglich bzw. erreichbar sind, wie z. B. die Innenwände von Rohren bzw. anderen Elementen von metallischen Leitungssystemen, insbesondere die Dekontamination von radioaktiven Verunreinigungen in solchen Systemen, war bisher nicht in jedem Falle mit gutem Erfolg bzw. zufriedenstellend auszuführen. Eines der gebräuchlichsten Verfahren hierfür ist das Elektropclieren. Jedoch konnten bisher nur wenige Meter lange demontierte Rohre mit beweglichen Elektroden innenseitig behandelt werden. Dazu wurden sowbhl das gesamte Eintauchen des Rohres in den Elektrolyten als auch das Füllen von zuvor abgedichteten Kammern im Rohr (Rohrstücken) angewendet (R.P. Allen und H.W. Arrowsmith, Materials Performance, Vol. 18, No. 11, Seiten 21 bis 26 (1979)). Aus der DE-B-24 35 277 ist ferner eine Anode für die galvanische Behandlung eines Hohlprofils bekannt, die aus einem leitenden Anodenkörper und daran befestigten Abstandshaltern aus nicht leitendem Werkstoff besteht.The removal of contaminants from metallic surfaces that are difficult to access, such as. B. the inner walls of pipes or other elements of metallic piping systems, especially the decontamination of radioactive contaminants in such systems, has so far not always been successful or satisfactory. One of the most common methods of doing this is electroplicing. However, previously dismantled pipes with movable electrodes could only be treated on the inside. For this purpose, both the entire immersion of the tube in the electrolyte and the filling of previously sealed chambers in the tube (tube pieces) were used (RP Allen and HW Arrowsmith, Materials Performance, Vol. 18, No. 11, pages 21 to 26 (1979) ). From DE-B-24 35 277 an anode for the galvanic treatment of a hollow profile is also known, which consists of a conductive anode body and spacers attached to it made of non-conductive material.

Einer der gravierenden Nachteile dieses Verfahrens bestand in der Notwendigkeit, die zu reinigenden Rohre vor dem Elektropolieren ausbauen zu müssen. Außerdem war es nicht möglich, über mehrere Krümmer hinweg oder gar durch Absperrschieber bzw. Hähne hindurchzufahren.One of the serious disadvantages of this process was the need to remove the pipes to be cleaned before electropolishing. In addition, it was not possible to drive through several bends or through gate valves or taps.

Der Erfindung liegt die Aufgabe zugrunde, ein Verfahren und eine Vorrichtung zu schaffen, mit welchem (welcher) ein metallisches Leitungssystem gereinigt werden kann, ohne es demontieren zu müssen. Unter Leitungssystem soll hier verstanden werden : Ein System von geraden und gekrümmten Rohren, einschließlich der zugehörigen Absperrorgane, wie z. B. Kugelhähne, Schieber oder ähnliches. Mit dem Verfahren sollen auch steigende bzw. fallende Leitungen gleich erfolgreich gereinigt werden können. Das Verfahren und die Vorrichtung sollen insbesondere für die Dekontamination von radioaktiv verunreinigter Leitungssysteme verwendbar sein.The invention has for its object to provide a method and an apparatus with which (which) a metallic pipe system can be cleaned without having to disassemble it. Under piping system should be understood here: a system of straight and curved pipes, including the associated shut-off devices, such as. B. ball valves, slide or the like. The process should also be able to successfully clean rising and falling pipes immediately. The method and the device should be usable in particular for the decontamination of radioactive contaminated line systems.

Die Aufgabe wird erfindungsgemäß dadurch gelöst, daß man den Elektrolyten mittels Hochdruck von ca. 5 MPa oder mehr auf ein Teilstück der Wandung des Leitungssystemes aufbringt, und daß man die Kathode mit Hilfe des Hochdruckstrahis im Leitungssystem bewegt.The object is achieved in that the electrolyte is applied by means of high pressure of approximately 5 MPa or more to a section of the wall of the line system, and that the cathode is moved in the line system with the aid of the high pressure jet.

Die erfindungsgemäße Vorrichtung zur Durchführung des Verfahrens ist gekennzeichnet durch einen elastischen Hochdruckschlauch mit einem metallischen, als Stromleiter dienenden Stabilisierungselement oder mit einer metallischen, als Stromleiter dienenden Litze, der an seinem Ende mit einer Hochdruckdüse mit mehreren radial und winkelig zur Innenwand des Leitungssystems angeordneten Öffnungen versehen ist, und durch eine elastische, metallische, um das Endstück des Hochdruckschlauches angeordnete und mit dem Stromleiter verbundene Elektrode, sowie durch mehrere, zumindest im Elektrodenbereich fest oder verschiebbar auf dem Hochdruckschlauch angeordnete, isolierende Abstandshalter.The device according to the invention for carrying out the method is characterized by an elastic high-pressure hose with a metallic stabilizing element serving as a current conductor or with a metallic strand serving as a current conductor, which is provided at its end with a high-pressure nozzle with a plurality of openings arranged radially and at an angle to the inner wall of the line system and by an elastic, metallic electrode which is arranged around the end piece of the high-pressure hose and connected to the current conductor, and by several insulating spacers which are arranged on the high-pressure hose in a fixed or displaceable manner, at least in the electrode area.

Die Elektrode der erfindungsgemäßen Vorrichtung kann als spiralförmige Kathode oder als gewendeltes Band ausgebildet sein. In einer vorteilhaften Ausbildung der erfindungsgemäßen Vorrichtung ist am Kopf der Hochdruckdüse eine elastische Kappe und an dem der Düse abgewandten Ende der Elektrode ein Abstandshalter mit einer um den Faktor > 1 größeren Fläche als jeweils derjenigen der (des) Abstandshalter(s) innerhalb des Elektrodenbereiches, jedoch kleineren Fläche, als dem kleinsten zu durchfahrenden Querschnitt des Leitungssystems entspricht, vorgesehen.The electrode of the device according to the invention can be designed as a spiral cathode or as a coiled strip. In an advantageous embodiment of the device according to the invention, there is an elastic cap at the head of the high-pressure nozzle and a spacer at the end of the electrode facing away from the nozzle with an area which is> 1 times larger than that of the spacer (s) within the electrode area, however, a smaller area than the smallest cross-section of the pipe system to be traversed is provided.

Durch die Elastizität der Elektroden ist eine Anpassung an gekrümmte Flächen möglich. Durch das selbständige Fördern mittels Hochdruckstrahl-Rückstoß ist eine Demontage der zu polierenden Rohre nicht mehr nötig und es kann sowohl durch Krümmer und Schieber als auch in geneigten Leitungen gearbeitet werden. Durch den gleichzeitigen Einsatz von Hochdruckstrahlen ist eine wesentlich bessere Reinigung der Rohre erzielbar. Durch die selbständige Förderung ist es möglich, Rohre fernbedient zu elektropolieren, wodurch die Strahlenbelastung des Personals wesentlich verringert werden kann. Der zu verwendende Elektrolyt wird durch die Hochdruckstrahldüse mit einem Druck ab ca. 5 MPa bis ca. 60 MPa auf die Innenwand des Rohres geschleudert. Durch die schräg gegen die Rohrwand gerichteten Elektrolytstrahlen wird die selbständige Vorwärtsbewegung der Elektrode im Inneren des Rohres erreicht. Die Elektrolytstrahlen ermöglichen den Stromdurchgang. Eine Stromstärke zwischen 300 und 400 Ampere reicht in den meisten Fällen aus.Due to the elasticity of the electrodes, an adaptation to curved surfaces is possible. Due to the independent conveying by means of high-pressure jet recoil, dismantling of the pipes to be polished is no longer necessary and work can be carried out using elbows and slides as well as in inclined lines. By using high pressure jets at the same time, the pipes can be cleaned much better. The independent funding makes it possible to electropolish pipes remotely, which can significantly reduce the radiation exposure of the personnel. The electrolyte to be used is thrown through the high-pressure jet nozzle at a pressure from approx. 5 MPa to approx. 60 MPa onto the inner wall of the tube. The independent forward movement of the electrode inside the tube is achieved by the electrolyte jets directed obliquely against the tube wall. The electrolyte rays allow the current to pass through. A current between 300 and 400 amperes is sufficient in most cases.

Im folgenden wird die Erfindung anhand eines Durchführungsbeispieles und anhand der Zeichnung erläutert :

  • Zur Dekontamination der mit radioaktiven Verunreinigungen kontaminierten Innenwand 2 eines Leitungssystems 1 wurde in dieses ein elastischer Hochdruckschlauch 5, der an seinem Ende 7 mit einer Edelstahlhochdruckstrahldüse 9 versehen war und um welchen eine Elektrode 4 aus einem 3 mm starken VA-Draht, ca. 30 mm lang gewickelt war und der zwei Abstandshalter 11 und 12 aus Kunststoff aufwies, eingeführt. Mit einer Hochdruckstrahlpumpe (in der Zeichnung nicht dargestellt) mit einer Leistung von 5 MPa wurde der Elektrolyt mit einer Geschwindigkeit von 1 200 I/Stunde durch den Hochdruckschlauch 5 und die Strahldüse 9 in das Rohrsystem, dessen Nennweite 150 mm betrug, bzw. auf dessen Innenwand 2 geschleudert. Das Rohrsystem bestand in diesem Falle aus einem 5 m langen Rohr mit einem Bogen von 90° in der Mitte. Die Hochdruckdüse 9 wies eine Reihe von Öffnungen 10 auf, die so angeordnet waren, daß der Elektrolyt winkelig zur Innenwand 2 des Rohres 1 auf die Wand auftraf. Die Geschwindigkeit der Vorwärtsbewegung der Vorrichtung innerhalb des Rohres betrug 5 cm/Minute. Der Strom floß von der nichtdargestellten Stromquelle durch den Stromleiter 6, durch die mit diesem verbundene, um das Endstück 8 des Hochdruckschlauches 5 angeordnete Elektrode 4 und wurde durch den Elektrolyten 3 und die metallische Innenwand 2 der Rohres 1 zurückgeleitet. Die Stromstärke lag bei ca. 300 Ampere. Die Hochdruckdüse 9 besaß an ihrem Kopf eine elastische Kappe 13, die gemeinsam mit dem an dem der Düse abgewandten Ende der Elektrode angeordneten Abstandshalter 12 bewirkte, daß der durch die Hochdruckdüse 9 geschleuderte Elektrolyt 3 nicht zu rasch wieder abfloß. Die isolierenden Abstandshalter 11 und 12 waren in - diesem Falle dreiarmige Sterne, die eine zentrale Öffnung aufwiesen, so daß sie auf den Hochdruckschlauch 5 aufgeschoben werden konnten. Der Abstandshalter 12 wies dabei eine doppelt so große Querschnittsfläche wie der Abstandshalter 11 auf.
The invention is explained below using an exemplary embodiment and the drawing:
  • In order to decontaminate the inner wall 2 of a line system 1 contaminated with radioactive contaminants, an elastic high-pressure hose 5, which was provided at its end 7 with a stainless steel high-pressure jet nozzle 9 and around which an electrode 4 made of a 3 mm thick VA wire, approx. 30 mm, was placed was wrapped long and the two spacers 11 and 12 made of plastic, introduced. With a high-pressure jet pump (not shown in the drawing) with an output of 5 MPa, the electrolyte was passed through the high pressure at a speed of 1200 I / hour hose 5 and the jet nozzle 9 in the pipe system, the nominal width was 150 mm, or thrown onto the inner wall 2. In this case the pipe system consisted of a 5 m long pipe with an elbow of 90 ° in the middle. The high pressure nozzle 9 had a series of openings 10 which were arranged such that the electrolyte struck the wall at an angle to the inner wall 2 of the tube 1. The speed of advancing the device within the tube was 5 cm / minute. The current flowed from the current source, not shown, through the current conductor 6, through the electrode 4 connected to it, around the end piece 8 of the high-pressure hose 5, and was conducted back through the electrolyte 3 and the metallic inner wall 2 of the tube 1. The current was about 300 amps. The high-pressure nozzle 9 had an elastic cap 13 on its head which, together with the spacer 12 arranged on the end of the electrode facing away from the nozzle, caused the electrolyte 3 thrown by the high-pressure nozzle 9 not to drain off too quickly. The insulating spacers 11 and 12 were - in this case, three-armed stars, which had a central opening, so that they could be pushed onto the high-pressure hose 5. The spacer 12 had a cross-sectional area twice as large as that of the spacer 11.

Es wurde ein Dekontaminationsfaktor von 300 erreicht, der nachdem die Rohrinnenwand 2 noch einmal mit warmem Wasser und Hochdruck abgespritzt (gespült) wurde, um den Faktor 10 erhöht werden konnte, so daß insgesamt ein Dekontaminationsfaktor von 3 000 erreicht wurde.A decontamination factor of 300 was achieved, which could be increased by a factor of 10 after the inner wall 2 of the pipe had been sprayed again with warm water and high pressure, so that a total decontamination factor of 3,000 was achieved.

Claims (5)

1. Method for cleaning the inner walls of metallic pipework systems by electropolishing using mobile electrodes, wherein the electrolyte is filled into the pipework system, with the electrode applied to a sector of the pipework wall by means . of about 5 MPa high pressure, and the cathode moved in the pipework system by means of the high pressure jet.
2. Device for application of the method as defined in Claim 1 including an elastic high pressure hose (5), a metallic element of stabilization serving as a current conductor (6) or a stranded wire serving as a current conductor (6) provided at its end (7) with a high pressure nozzle (9) with several holes (10) placed radially and at angles with respect to the inner wall (2) of the pipework system (1) and with an elastic, metallic electrode (4) surrounding the end piece (8) of the high pressure hose (5) and connected with the current conductor (6), and several insulating spacers (11, 12) which, at least in the electrode zone, are firmly attached or movable on the high pressure hose (5).
3. Device as defined in Claim 2, wherein the electrode is made as a spiral cathode (4).
4. Device as defined in Claim 2, wherein the electrode (4) is made as helical band.
5. Device as defined in Claim 2, wherein at the head of the high pressure nozzle (9) an elastic cap (13) is provided and at the end of the electrode opposing the nozzle a spacer (12) with surfaces greater by the factor 1 each than that of the spacer(s) (11) within the electrode zone, although smaller than corresponding to the smallest cross section to be passed of the pipework system (1).
EP82104945A 1981-09-12 1982-06-05 Method and apparatus for cleaning the inner walls of metallic tubular systems by electropolishing by means of moving electrodes Expired EP0074463B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3136187A DE3136187C2 (en) 1981-09-12 1981-09-12 Method and device for cleaning the inner walls of metallic pipe systems by electropolishing with the aid of moving electrodes
DE3136187 1981-09-12

Publications (2)

Publication Number Publication Date
EP0074463A1 EP0074463A1 (en) 1983-03-23
EP0074463B1 true EP0074463B1 (en) 1985-08-07

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EP82104945A Expired EP0074463B1 (en) 1981-09-12 1982-06-05 Method and apparatus for cleaning the inner walls of metallic tubular systems by electropolishing by means of moving electrodes

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JP (1) JPS5855600A (en)
DE (1) DE3136187C2 (en)

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DE3343396A1 (en) * 1983-11-30 1985-06-05 Kraftwerk Union AG, 4330 Mülheim METHOD FOR DECONTAMINATING METALLIC COMPONENTS OF A NUCLEAR TECHNICAL PLANT
DE3345278A1 (en) * 1983-12-14 1985-06-27 Kraftwerk Union AG, 4330 Mülheim DEVICE FOR ELECTROPOLISHING THE INTERNAL SURFACE OF HOLLOW CYLINDRICAL BODIES
DE3430384A1 (en) * 1984-08-17 1986-02-20 Kraftwerk Union AG, 4330 Mülheim METHOD AND DEVICE FOR ELECTROPOLISHING THE INTERIOR SURFACE OF U-SHAPED HEAT EXCHANGER TUBES
DE3564708D1 (en) * 1984-11-09 1988-10-06 Siemens Ag Apparatus for electropolishing the inner surfaces of tubes
DE3614046A1 (en) * 1985-05-09 1986-11-20 EAB Electronic-Apparate-Bau GmbH, 8984 Riezlern Device for cleaning laid pipes
US4690737A (en) * 1986-06-10 1987-09-01 Cation Corporation Electrochemical rifling of gun barrels
JP2678754B2 (en) * 1987-06-09 1997-11-17 日本酸素株式会社 Manufacturing method of stainless steel manifold for supplying high purity gas
GB2319259A (en) * 1996-11-15 1998-05-20 Babcock Rosyth Defence Limited reducing radionucleide contamination of a metallic component
FR2886560B1 (en) * 2005-06-03 2007-08-17 Commissariat Energie Atomique DEVICE FOR UNPLUGGING A PIPE
CN103305898A (en) * 2012-03-08 2013-09-18 鸿富锦精密工业（深圳）有限公司 Deburring method and deburring system using same
US20190177872A1 (en) * 2016-06-21 2019-06-13 Extrude Hone Gmbh Electrolytic polishing method and device and method for producing a cathode
JP7149083B2 (en) * 2018-03-09 2022-10-06 日立造船株式会社 Electrolytic machining instrument and electrolytic machining method

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US2764540A (en) * 1952-09-10 1956-09-25 William G Farin Method and means for electropolishing inner surfaces
DE1212369B (en) * 1954-04-23 1966-03-10 Alberto Reinhart Dipl Ing Device and method for cleaning pipelines used to convey liquids or gases
FR1209242A (en) * 1958-07-09 1960-02-29 Jacquet Hispano Suiza Improvements to processes and apparatus for electrolytic treatment of tubes, more specifically for polishing
DE1222330B (en) * 1960-08-08 1966-08-04 Combinatie Voor Landverbeterin Method for cleaning pipelines, in particular underground sewer pipes, by means of a jet head
DE1931174B2 (en) * 1969-06-19 1975-09-04 Siemens Ag, 1000 Berlin Und 8000 Muenchen Device for electrolytic continuous polishing of rod-shaped workpieces made of zircon alloys
DE1954704A1 (en) * 1969-10-30 1971-05-06 Jakob Thaler Charger for cable drums
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JP2738622B2 (en) * 1992-05-21 1998-04-08 京セラ株式会社 Package for storing semiconductor elements

Also Published As

Publication number Publication date
DE3136187A1 (en) 1983-04-28
EP0074463A1 (en) 1983-03-23
JPS5855600A (en) 1983-04-01
DE3136187C2 (en) 1988-08-18
JPS6157920B2 (en) 1986-12-09

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