EP0447391B2 - Element d'obturation pour tubes d'echange de chaleur defectueuse - Google Patents

Element d'obturation pour tubes d'echange de chaleur defectueuse Download PDF

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Publication number
EP0447391B2
EP0447391B2 EP88909985A EP88909985A EP0447391B2 EP 0447391 B2 EP0447391 B2 EP 0447391B2 EP 88909985 A EP88909985 A EP 88909985A EP 88909985 A EP88909985 A EP 88909985A EP 0447391 B2 EP0447391 B2 EP 0447391B2
Authority
EP
European Patent Office
Prior art keywords
pipe
pipe plug
cylindrical part
heat
conical part
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
EP88909985A
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German (de)
English (en)
Other versions
EP0447391B1 (fr
EP0447391A1 (fr
Inventor
Peter Krausser
Alexander HÜMMELER
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.)
Areva GmbH
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
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Application filed by Siemens AG filed Critical Siemens AG
Publication of EP0447391A1 publication Critical patent/EP0447391A1/fr
Application granted granted Critical
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Publication of EP0447391B2 publication Critical patent/EP0447391B2/fr
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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

Definitions

  • the invention relates to a pipe plug for closing a defective heat exchanger tube, in which a hollow cylindrical part merges into a hollow conical part closed at the free end and the cylindrical part has an outer diameter which is slightly smaller than the inner diameter of the heat exchanger pipe to be closed, and through Widening is brought into sealing contact with the inner surface of the heat exchanger tube, means for inserting and locking a drawing tool being fitted in the cylindrical part and / or in the conical part.
  • a pipe plug of the type mentioned is known for example from EP-A-0 137 984.
  • This pipe plug is provided with burrs on its outer circumference in the area to be expanded in order to achieve a good press fit and a good sealing effect.
  • a threaded hole is provided in the pipe plug, into which a threaded shaft can be screwed. Due to the ridges arranged on the outer circumference, however, high forces are required for pulling and the removal of the pipe plugs is difficult
  • US-A-4 513 786 discloses a pipe plug having a substantially constant outside diameter, with a portion of the plug near its open end having a slightly larger diameter so as to ensure an easy interference fit in the pipe.
  • a band of deformable material either gold, silver or pure iron, is applied to a portion of the outer surface of the plug.
  • the pipe plug is then inserted flush into the pipe end. It is then expanded by means of a rolling device in the section provided with the deformable material, so that a tight connection with the tube is produced.
  • This pipe plug is difficult to remove and can only be removed using special gripping tools.
  • corrosion-promoting deposits can collect in the unexpanded area between the pipe plug and the heat exchanger pipe. These lead to the destruction of the pipe plug or the pipe.
  • the present invention has for its object to provide a rolling plug of the type mentioned, which has greater holding forces compared to the known pipe plug with improved sealing effect and is still easy to pull, and in which the formation of high mechanical stresses and thus the development during rolling Risk of subsequent stress corrosion cracking is avoided.
  • the indentations are ring-shaped.
  • This design of the pipe plug enables the use of a simple drawing tool which is provided with expandable barbs. A simple, time-saving pulling of the pipe plug is possible, so that the dose load on the operating personnel can be kept very small.
  • a nickel material is preferably used as the deformable metal. This results in a particularly high corrosion resistance and good ductility of the pipe plug, which leads to a particularly tight connection in heat exchanger pipes, which mostly consist of Inconel.
  • the cylindrical part of the pipe plug with a flange at the end, which has at least one notch for engaging a tool. This ensures a secure connection between the rolling tool and the pipe plug in a simple manner.
  • the pipe plug is released particularly well if the web is meandering.
  • the pipe plug can then be removed from the heat exchanger pipe in a simple manner with the aid of a drawing tool.
  • the pipe plug 1 shows a pipe plug 1 which is inserted into a heat exchanger pipe 2.
  • the pipe plug 1 consists of a hollow cylindrical part 3, which flows smoothly inside and outside into a conical part 4 without a shoulder.
  • the pipe plug 1 has a slightly smaller outside diameter than the heat exchanger pipe 2 to be closed.
  • the length ratio between the cylindrical part 3 and the conical part 4 is about 1: 1.
  • the pipe plug 1 is brought into sealing contact with the inner surface of the heat exchanger tube 2 by widening or rolling a region 5 of the cylindrical part 3, thereby making it Heat exchanger tube 2 is firmly held.
  • the pipe plug 1 has a roughness depth of 0.05 to 0.2 mm in the area 5 to be expanded. This results in an increase in the holding forces.
  • means 6 for inserting and locking a tool are attached in the closed end of the conical part 4. These means 6 can alternatively be accommodated in the cylindrical part 3.
  • a drawing tool or a setting tool are provided as tools.
  • the cylindrical part 3 of the pipe plug 1 is provided with a flange 7, the flange 7 having at least one notch 8 for the torque-locking engagement of a tool.
  • the area 5 can also be provided with a layer 9 of deformable metal. This achieves a good sealing effect and also enables the pipe plug 1 to be pulled more easily.
  • a nickel material is used as the deformable metal. This makes one special high corrosion resistance and good ductility of this area 5 achieved. This leads to a particularly tight connection in the heat exchanger tube, which mostly consist of Inconel.
  • the pipe plug wall 11 in particular its widened area 5
  • a welding device 10 inserted into the inside of the pipe plug 1 melted.
  • This predetermined path 12a can be spiral, for example.
  • the cylindrical part 3 shrinks in the widened region 5, as a result of which the pipe plug 1 is no longer adhered to a pipe wall 12 and the pipe plug 1 can be removed without great pulling forces and without damaging the heat exchanger pipe 2
  • the conical part 4 is thicker in its wall thickness than the cylindrical part 3. The arrangement of the means 6 for pulling the pipe plug 1 in the conical part 4 therefore does not result in any deformation of the pipe plug 1 when pulling.
  • the shape of the pipe plug 1 ensures that the space between the heat exchanger pipe 2 and the conical part 4 of the pipe plug 1 is rinsed, thus preventing a concentration of corrosion products.
  • FIG 3 shows the cylindrical part 3 of a cut pipe plug 1, which has on its inside on the pipe plug wall 11 a web 12a, which is preferably meandering. By melting the pipe plug 1 on such a track 12a, the pipe plug 1 can be easily removed from the heat exchanger pipe 2.
  • FIG. 4 shows a section of the conical part 4 in cross section, which is provided with means 6 for inserting a drawing tool 15.
  • the means are designed as a recess 13. Extendable claws 14 of a drawing tool 15 can be hooked into the recesses 13.
  • the turns 13 are annular.
  • Such a drawing tool 15 is particularly quick and easy to use, as a result of which particularly short operating times are achieved. This also keeps the dose burden on the operating personnel very low.
  • the pipe plug 1 is then removed from the heat exchanger pipe 2 by means of the drawing tool 15.
  • FIG. 5 shows a further embodiment of the pipe plug 1, in which the means 6 are designed as threads 16.
  • the screw-shaped drawing tool 15a is locked in the pipe plug 1 by a rotary movement

Landscapes

  • 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)
  • Automatic Assembly (AREA)
  • Pipe Accessories (AREA)

Abstract

Pour fermer l'une des extrémités d'un tube d'échange de chaleur (2), on a prévu un élément d'obturation (1) qui consiste en une partie cylindrique creuse (3), prolongée sans interruption par une partie conique creuse (4) et dont le diamètre extérieur est légèrement inférieur à celui du tube d'échange de chaleur à obturer (2). On introduit l'élément d'obturation (1) dans le tube d'échange de chaleur (2) et on l'élargit ou on le mandrine pour le faire entrer en contact avec la surface interne du tube d'échange de chaleur (2), ainsi obturée. Des dispositifs (6) sont prévus dans la partie conique (4) pour poser un outil d'emboutissage (15). La partie cylindrique (3) est rugueuse dans la région qui s'élargit. Un procédé pour enlever l'élément d'obturation (1) consiste à tracer par soudure sur les parois de cet élément (1) une ligne prédéterminée (12a), qui en fondant le fera se rétracter et le libérera.

Claims (8)

  1. Obturateur (1) pour un tube, destiné à fermer un tube défectueux (2) d'un échangeur de chaleur, dans lequel une partie cylindrique (3) creuse se poursuit par une partie conique (4) creuse, fermée à l'extrémité libre et la partie cylindrique (3) a un diamètre extérieur légèrement plus petit que le diamètre intérieur du tube (2) de l'échangeur de chaleur à fermer, et est mise en contact étroit avec la face intérieure du tube (2) de l'échangeur de chaleur par élargissement, des moyens (6) de montage et de blocage d'un outil de traction (15) étant prévus dans la partie cylindrique (3) et/ou dans la partie conique (4),
       caractérisé en ce qu'une région (5) s'élargissant de la partie cylindrique (3) est rendue rugueuse jusqu'à une profondeur de rugosité de 0,05 à 0,2 mm, et en ce que la transition entre la partie cylindrique (3) et la partie conique (4) est continue et sans décrochement.
  2. Obturateur pour un tube suivant la revendication 1, caractérisé en ce que la région (5) rendue rugueuse est munie d'une couche (9) en métal ductile.
  3. Obturateur pour un tube suivant la revendication 1 ou 2, caractérisé en ce que la partie conique (4) a une paroi plus épaisse que la partie cylindrique (3), et en ce que les moyens (6) sont formés dans la partie conique (4) sous la forme d'une gorge (13).
  4. Obturateur pour un tube suivant la revendication 3, caractérisé en ce que la gorge (13) est de forme annulaire ou sous la forme d'un taraudage.
  5. Obturateur pour un tube suivant l'une des revendications 2 à 4, caractérisé en ce qu'il est prévu, comme matériau ductile, un matériau au nickel.
  6. Obturateur pour un tube suivant l'une des revendications 1 à 5, caractérisé en ce que la partie cylindrique ouverte (3) est munie, du côté de l'extrémité, d'une bride (7), et la bride (7) comporte au moins une encoche (8) pour l'attaque d'un outil.
  7. Obturateur pour un tube suivant l'une des revendications précédentes, caractérisé en ce que le rapport en longueur entre la partie cylindrique (3) et la partie conique (4) est égal à 1:1 environ,
  8. Utilisation d'un obturateur (1) de tube suivant l'une des revendications 1 à 7, pour fermer un tube (2) d'échangeur de chaleur défectueux.
EP88909985A 1988-11-29 1988-11-29 Element d'obturation pour tubes d'echange de chaleur defectueuse Expired - Lifetime EP0447391B2 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/DE1988/000738 WO1990006483A1 (fr) 1988-11-29 1988-11-29 Element d'obturation pour tube d'echange de chaleur presentant des fuites et procede pour enlever cet element d'obturation

Publications (3)

Publication Number Publication Date
EP0447391A1 EP0447391A1 (fr) 1991-09-25
EP0447391B1 EP0447391B1 (fr) 1992-08-26
EP0447391B2 true EP0447391B2 (fr) 1997-01-08

Family

ID=6819846

Family Applications (1)

Application Number Title Priority Date Filing Date
EP88909985A Expired - Lifetime EP0447391B2 (fr) 1988-11-29 1988-11-29 Element d'obturation pour tubes d'echange de chaleur defectueuse

Country Status (4)

Country Link
EP (1) EP0447391B2 (fr)
DE (1) DE3874152D1 (fr)
ES (1) ES2017441A6 (fr)
WO (1) WO1990006483A1 (fr)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19513460C1 (de) * 1995-04-08 1996-06-27 Bbc Reaktor Gmbh Einrichtung zur Inspektion und/oder Reparatur eines Wärmetauscherrohres
DE19811599C2 (de) * 1998-03-17 2002-01-10 Framatome Anp Gmbh Rohr mit einem Aufweitbereich

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4178966A (en) † 1978-02-13 1979-12-18 Combustion Engineering, Inc. Tube plug
US4502511A (en) † 1983-01-03 1985-03-05 Westinghouse Electric Corp. Tube plug
EP0137984A2 (fr) † 1983-10-14 1985-04-24 Lummus Crest S.A.R.L. Manchon de réparation pour tube de générateur de vapeur
US4513786A (en) † 1983-04-14 1985-04-30 Combustion Engineering, Inc. Mechanical tube plub

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CA1228003A (fr) * 1983-11-15 1987-10-13 Laszlo Szalvay Dispositif d'emmanchement d'une piece annulaire en metal a memoire
DE3716328C3 (de) * 1987-05-15 1994-07-28 Bbc Reaktor Gmbh Hohlstopfen zum Verschließen eines Wärmetauscherrohres

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4178966A (en) † 1978-02-13 1979-12-18 Combustion Engineering, Inc. Tube plug
US4502511A (en) † 1983-01-03 1985-03-05 Westinghouse Electric Corp. Tube plug
US4513786A (en) † 1983-04-14 1985-04-30 Combustion Engineering, Inc. Mechanical tube plub
EP0137984A2 (fr) † 1983-10-14 1985-04-24 Lummus Crest S.A.R.L. Manchon de réparation pour tube de générateur de vapeur

Also Published As

Publication number Publication date
ES2017441A6 (es) 1991-02-01
WO1990006483A1 (fr) 1990-06-14
EP0447391B1 (fr) 1992-08-26
EP0447391A1 (fr) 1991-09-25
DE3874152D1 (de) 1992-10-01

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