EP0271739B1 - Verfahren zum Reparieren und Schützen eines Endes eines metallischen Wärmeaustauschrohres und Buchse zur Durchführung - Google Patents

Verfahren zum Reparieren und Schützen eines Endes eines metallischen Wärmeaustauschrohres und Buchse zur Durchführung Download PDF

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Publication number
EP0271739B1
EP0271739B1 EP87117143A EP87117143A EP0271739B1 EP 0271739 B1 EP0271739 B1 EP 0271739B1 EP 87117143 A EP87117143 A EP 87117143A EP 87117143 A EP87117143 A EP 87117143A EP 0271739 B1 EP0271739 B1 EP 0271739B1
Authority
EP
European Patent Office
Prior art keywords
tube
sleeve
area
corrosion
submitted
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 - Lifetime
Application number
EP87117143A
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English (en)
French (fr)
Other versions
EP0271739A1 (de
Inventor
Gilbert Vigneron
Jean Bezier
Thong Nguyen Thanh
Pierre Vidal
Guy Zacharie
Lucien Guillemin
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.)
Stein Industrie SA
Electricite de France SA
Original Assignee
Stein Industrie SA
Electricite de France SA
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
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Application filed by Stein Industrie SA, Electricite de France SA filed Critical Stein Industrie SA
Publication of EP0271739A1 publication Critical patent/EP0271739A1/de
Application granted granted Critical
Publication of EP0271739B1 publication Critical patent/EP0271739B1/de
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
    • F28F11/00—Arrangements for sealing leaky tubes and conduits
    • F28F11/02—Arrangements for sealing leaky tubes and conduits using obturating elements, e.g. washers, inserted and operated independently of each other
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T29/00—Metal working
    • Y10T29/49—Method of mechanical manufacture
    • Y10T29/4935—Heat exchanger or boiler making
    • Y10T29/49352—Repairing, converting, servicing or salvaging
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T29/00—Metal working
    • Y10T29/49—Method of mechanical manufacture
    • Y10T29/49718—Repairing
    • Y10T29/49732—Repairing by attaching repair preform, e.g., remaking, restoring, or patching
    • Y10T29/49742—Metallurgically attaching preform
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T29/00—Metal working
    • Y10T29/49—Method of mechanical manufacture
    • Y10T29/49718—Repairing
    • Y10T29/49748—Repairing by shaping, e.g., bending, extruding, turning, etc.
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T29/00—Metal working
    • Y10T29/49—Method of mechanical manufacture
    • Y10T29/49826—Assembling or joining
    • Y10T29/49908—Joining by deforming
    • Y10T29/49909—Securing cup or tube between axially extending concentric annuli
    • Y10T29/49911—Securing cup or tube between axially extending concentric annuli by expanding inner annulus
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T29/00—Metal working
    • Y10T29/49—Method of mechanical manufacture
    • Y10T29/49826—Assembling or joining
    • Y10T29/49908—Joining by deforming
    • Y10T29/49938—Radially expanding part in cavity, aperture, or hollow body
    • Y10T29/4994—Radially expanding internal tube
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T428/00—Stock material or miscellaneous articles
    • Y10T428/12—All metal or with adjacent metals
    • Y10T428/12347—Plural layers discontinuously bonded [e.g., spot-weld, mechanical fastener, etc.]

Definitions

  • the present invention relates to a method for repairing or protecting a damaged or corrosion-prone area of an end of a metal exchanger tube in the vicinity of the internal face of its tube plate, in which the inside is inserted tube a metal sleeve with an external diameter less than the internal diameter of the tube, over a sufficient length from the external face of the tube plate to penetrate the tube beyond the damaged or prone to corrosion area, localized expansion is carried out from the end of the sleeve located on the side of the external face of the tube plate on the tube, this end of the sleeve is locally welded to the corresponding end of the tube, the end of the sleeve is docked in the tube beyond the damaged or corrosion-prone area and locally welds this end of the sleeve to the inside of the tube with partial penetration into it. It also extends to a mason usable in this process.
  • one of the fluids for example the heating fluid
  • circulates inside the tubes and the other, for example the heated fluid, to the outside of the tubes.
  • Document EP A 0 181 250 describes a method for repairing a damaged or corrosion-prone area at the end of a metal tube of a steam generator in the vicinity of the internal face of its tube plate, in which the inside the tube a metal jacket with an external diameter slightly smaller than the internal diameter of the tube over a length sufficient to penetrate the tube beyond the damaged area.
  • An expansion of the part of the liner close to the external face of the tube plate is carried out in the tube, then the corresponding edges of the sleeve and of the tube are welded together.
  • the end of the sleeve is expanded diametrically beyond the area damaged by swelling and the expanded part of the sleeve is brazed with the tube.
  • Document EP-A 0 121 137 has proposed a similar method, in which, after having accosted the sleeve against the tube beyond the damaged zone of the tube, the sleeve was subjected to an upward or downward translation to ensure better contact between them, then performed a weld in the expanded area between the sleeve and the tube.
  • This process had the same defect as the previous one with regard to the appearance of thermal stresses between tube and sleeve at the weld between their edges and did not make it possible to precisely determine the translation of the sleeve necessary to obtain a good seal of the area of the expanded sleeve beyond the damaged area of the tube.
  • the object of the present invention is to provide a method of repairing or protecting a damaged or subject to corrosion area of a tube end, which avoids any danger of subsequent corrosion of the tube, in particular by creating excessive residual stresses in that -this, while constituting a mechanically robust protection and an absolute seal.
  • the method according to the invention is characterized in that the localized welding is carried out inside the expanded zone set back from the edge of the sleeve, with partial penetration of the weld into the tube, and in that then performs an expansion of the end region of the sleeve against the tube in an area located inside the tube plate above the localized weld.
  • the invention further extends to a sleeve for carrying out the method of the invention, with an external diameter slightly less than the internal diameter of the tube, and with a length greater than that of the damaged area or subject to corrosion, characterized in that it comprises either in the vicinity of one of its ends an external metallic coating of small thickness which is a good conductor of heat and which is not very oxidizable, or, at least at one of its ends, an area provided with fines longitudinal external grooves, or both.
  • the tube 1 is fixed to the tubular plate 2, in the usual way, by swaging, and its lower end is welded to the external face of this plate, as represented by the weld bead 3.
  • the repair is carried out using an internal sleeve 5, with an external diameter slightly smaller than the internal diameter of the tube, which covers the partially corroded zone of the tube.
  • This sleeve 5 is tightly connected to the tube in the two zones 6, inside the tube plate, and 7, beyond the latter and the corroded zone.
  • the sleeve is first expanded in the tube in a localized manner in this zone. This expansion can take place under inert gas or with inert gas blowing.
  • the welding is carried out back from the edge of the sleeve by the automatic arc arc process using an inert gas using a device for internal welding of tubes (this position allowing greater flexibility in the adjustment in altitude welding torch).
  • the preliminary expansion allows the heat to be concentrated in the area to be welded, which facilitates the penetration of the weld, the removal of the metal after welding and the evacuation of the gas trapped between the tube and the sleeve.
  • the weld bead must have good penetration into the thickness of the tube (from 20% to 75% thereof), but without crossing it.
  • the sleeve can be provided in the region provided for the weld bead and on either side of it with a thin deposit of a metal which is not very oxidizable and which is a good conductor of heat. , such as le.chrome, obtained for example by metallization (deposit 14 in fig. 3). It is also possible, in order to further facilitate the evacuation of the air retained in the gap between the tube and the sleeve, to provide the lower end of the sleeve up to the level of the weld bead with fine longitudinal grooves. , for example four grooves at 90 ° (grooves 15 and fig. 4). The air can be evacuated either by blowing inert gas, or by vacuum, if the assembly allows.
  • the upper weld is then produced after the sleeve has come into contact with the tube by controlled deformation of the diameter, by controlling the expansion of the sleeve by the number of spindle turns of a dudgeon.
  • This ensures good repeatability of obtaining good contact between the tube and the sleeve, a necessary condition for ensuring good bond welding by limiting the stresses induced in the tube.
  • This upper welding can also be carried out behind the edge of the sleeve, for example at 20 or 30 mm from this edge (weld bead 9 in FIG. 1). It is also possible to ensure complete fusion welding of the edge of the sleeve (weld bead 9A in FIG. 2).
  • the shape of this connection allows the control of the zone 13 thermally affected by the welding and located above the welding.
  • This type of weld bead is obtained by adjusting the position and the inclination of the welding electrode, that is to say by appropriate preparation of the end of the sleeve by machining.
  • the welding operations by the arc process under inert gas with tungsten electrode can optionally be substituted for laser beam or electron beam welds.
  • the quality of the welds can be controlled by non-destructive means such as endoscopic examination, penetrant testing, eddy currents and ultrasound.

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Butt Welding And Welding Of Specific Article (AREA)
  • Arc Welding In General (AREA)

Claims (14)

1. Verfahren zum Reparieren oder Schützen eines beschädigten oder der Korrosion unterliegenden Bereichs (4) eines Endes eines Metallrohrs (1) eines Wärmetauschers in der Nähe der Innenseite seiner Rohrplatte (2), bei dem man ins Innere des Rohrs eine Metallmuffe (5), deren Außendurchmesser geringfügig kleiner als der Innendurchmesser des Rohrs ist, über eine ausreichende Länge ausgehend von der Außenseite der Rohrplatte her einführt, die in das Rohr bis über den beschädigten oder der Korrosion unterliegenden Bereich hinaus eindringt, dann ein örtlich begrenztes Walzen (6) des Endes der Muffe auf der Seite der Außenseite der Rohrplatte auf dem Rohr durchführt, dann lokal (8) dieses Ende der Muffe auf das entsprechende Ende des Rohrs aufschweißt, dann das Ende der Muffe (7) in dem Rohr jenseits des beschädigten oder der Korrosion unterliegenden Bereichs ankoppelt und lokal (9) dieses Ende der Muffe auf das Innere des Rohrs mit teilweisem Eindringen in dieses Rohr aufschweißt, dadurch gekennzeichnet, daß man das lokale Schweißen (8) innerhalb des gewalzten Bereichs (6) vom Rand der Muffe entfernt mit teilweisem Eindringen der Schweißnaht in das Rohr durchführt und daß man dann ein Walzen des Endbereichs der Muffe gegen das Rohr in einem Bereich durchführt, der sich im Inneren der Rohrplatte oberhalb der lokalen Schweißnaht (8) befindet.
2. Verfahren nach Anspruch 1, dadurch gekennzeichnet, daß man vor dem Einführen der Muffe in das Rohr knapp oberhalb der Innenseite der Rohrplatte ein Loch oder mehrere Löcher (12) geringen Durchmessers in das Rohr bohrt, die seine Wand ganz oder teilweise durchdringen.
3. Verfahren nach Anspruch 1 oder 2, dadurch gekennzeichnet, daß man ein örtlich begrenztes Walzen des Endes der Muffe auf der Außenseite der Rohrplatte unter Inertgas oder mit Einblasen von Inertgas durchführt.
4. Verfahren nach einem der Ansprüche 1 bis 3, dadurch gekennzeichnet, daß man vor dem Einführen der Muffe in das Rohr das Ende der Muffe, das in dem Rohr auf der Außenseite der Rohrplatte gewalzt werden soll, mit einer dünnen, gut wärmeleitenden und wenig oxidierenden Metallschicht (14, Figur 3) versieht.
5. Verfahren nach einem der Ansprüche 1 bis 3, dadurch gekennzeichnet, daß man vor dem Einführen der Muffe in das Rohr das Ende der Muffe, das im Rohr auf der Außenseits der Rohrplatte gewalzt werden soll, mit einer Reihe von Längsnuten (15, Figur 4) versieht und daß man vor der Durchführung der Schweißung die im Zwischenraum zwischen dem Rohr und der Muffe vorhandene Luft durch Einblasen von Inertgas in diese Nuten oder durch Unter-Vakuumsetzen dieser Nuten entfernt.
6. Verfahren nach Anspruch 5, dadurch gekennzeichnet, daß man auch das andere Ende der Muffe mit einer Reihe von Längsnuten versieht und daß man vor dem Schweißen nahe diesem anderen Ende die in dem Zwischenraum zwischen dem Rohr und der Muffe vorhandene Luft durch Einblasen von Inertgas in die Nuten oder durch Unter-VakuumSetzen entfernt.
7. Verfahren nach einem der Ansprüche 1 bis 6, dadurch gekennzeichnet, daß man nach dem Schweißen der Muffe auf dem Endbereich des Rohrs an der Außenseite der Rohrplatte die Muffe im Rohr jenseits dieser Schweißnaht mehrmals walzt.
8. Verfahren nach einem der Ansprüche 1 bis 7, dadurch gekennzeichnet, daß man die Muffe auf das Rohr jenseits des beschädigten oder der Korrosion unterliegenden Bereichs in einem Abstand vom Ende der Muffe aufschweißt.
9. Verfahren nach einem der Ansprüche 1 bis 8, dadurch gekennzeichnet, daß das Ankoppeln des Endes der Muffe im Rohr jenseits des beschädigten oder der Korrosion unterliegenden Bereichs durch kontrollierte Verformung des Durchmessers durchgeführt wird.
10. Verfahren nach einem der Ansprüche 1 bis 9, dadurch gekennzeichnet, daß das Anschweißen der Muffe an das Rohr jenseits des beschädigten oder der Korrosion unterliegenden Bereichs auf dem Rand der Muffe selbst (9A, Figur 2) durchgeführt wird.
11. Verfahren nach einem der Ansprüche 1 bis 10, dadurch gekennzeichnet, daß man die Schweißnaht des gewalzten Endes der Muffe und des Inneren des Rohrs jenseits des beschädigten oder der Korrosion unterliegenden Bereichs mit Hilfe eines inneren Induktors einer Spannungsabbau-Behandlung unterzieht.
12. Verfahren nach einem der Ansprüche 1 bis 11, dadurch gekennzeichnet, daß man den Bereich (10) der Muffe jenseits des gewalzten Bereichs im Rohr im Inneren der Rohrplatte einer Spannungsabbau-Behandlung durch leichtes Walzen unterzieht.
13. Muffe zum Reparieren oder Schützen eines beschädigten oder der Korrosion unterliegenden Bereichs eines Endes eines metallischen Wärmetauscherrohrs gemäß dem Verfahren nach Anspruch 1, deren Außendurchmesser geringfügig kleiner als der Innendurchmesser des Rohrs und deren Länge größer als die des beschädigten oder der Korrosion unterliegenden Bereichs ist, dadurch gekennzeichnet, daß sie in der Nähe eines ihrer Enden eine dünne, äußere, gut wärmeleitende und wenig oxidierende Metallschicht aufweist (14, Figur 3).
14. Muffe zum Reparieren oder Schützen eines beschädigten oder der Korrosion unterliegenden Bereichs eines Endes eines metallischen Wärmetauscherrohrs gemäß dem Verfahren nach Anspruch 1, deren Außendurchmesser geringfügig kleiner als der Innendurchmesser des Rohrs und deren Länge größer als die des beschädigten oder der Korrosion unterliegenden Bereichs ist, dadurch gekennzeichnet, daß sie ausgehend von mindestens einem ihrer Enden einen Bereich mit feinen äußeren Längsnuten (15, Figur 4) aufweist.
EP87117143A 1986-11-21 1987-11-20 Verfahren zum Reparieren und Schützen eines Endes eines metallischen Wärmeaustauschrohres und Buchse zur Durchführung Expired - Lifetime EP0271739B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR8616231 1986-11-21
FR8616231A FR2607235B1 (fr) 1986-11-21 1986-11-21 Procede de reparation ou de protection d'une extremite de tube metallique d'echangeur de chaleur, et manchon pour sa mise en oeuvre

Publications (2)

Publication Number Publication Date
EP0271739A1 EP0271739A1 (de) 1988-06-22
EP0271739B1 true EP0271739B1 (de) 1990-10-03

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EP87117143A Expired - Lifetime EP0271739B1 (de) 1986-11-21 1987-11-20 Verfahren zum Reparieren und Schützen eines Endes eines metallischen Wärmeaustauschrohres und Buchse zur Durchführung

Country Status (9)

Country Link
US (1) US4960650A (de)
EP (1) EP0271739B1 (de)
JP (1) JPS63153398A (de)
KR (1) KR880006523A (de)
DE (1) DE3765402D1 (de)
ES (1) ES2017991B3 (de)
FR (1) FR2607235B1 (de)
IN (1) IN172043B (de)
ZA (1) ZA878663B (de)

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EP1722917A1 (de) * 2004-03-09 2006-11-22 Bründermann, Georg Verfahren zur herstellung einer wärmetauscher-trennwand mit einer aufpanzerung und wärmetauscher-trennwand
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RU2675952C2 (ru) * 2014-01-10 2018-12-25 Эуротекника Меламине, Люксембург, Цвайгнидерлассунг ин Иттиген Трубчатый теплообменник и установка, в частности реактор для производства меламина, содержащая такой теплообменник
CN114182088B (zh) * 2021-12-08 2023-10-13 中国石油大学(华东) 降低管壳式换热器换热管与管板焊接接头应力腐蚀开裂风险的局部热处理方法

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Also Published As

Publication number Publication date
IN172043B (de) 1993-03-20
DE3765402D1 (de) 1990-11-08
FR2607235B1 (fr) 1990-02-16
US4960650A (en) 1990-10-02
EP0271739A1 (de) 1988-06-22
ES2017991B3 (es) 1991-03-16
ZA878663B (en) 1988-05-18
FR2607235A1 (fr) 1988-05-27
JPS63153398A (ja) 1988-06-25
KR880006523A (ko) 1988-07-23

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