EP1559983A1 - Verfahren zum Verschweissen von Rohren mit einem Rohrboden und eine durch ein solches Verfahren hergestellte Vorrichtung - Google Patents

Verfahren zum Verschweissen von Rohren mit einem Rohrboden und eine durch ein solches Verfahren hergestellte Vorrichtung Download PDF

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Publication number
EP1559983A1
EP1559983A1 EP04075261A EP04075261A EP1559983A1 EP 1559983 A1 EP1559983 A1 EP 1559983A1 EP 04075261 A EP04075261 A EP 04075261A EP 04075261 A EP04075261 A EP 04075261A EP 1559983 A1 EP1559983 A1 EP 1559983A1
Authority
EP
European Patent Office
Prior art keywords
bore
tube
tubesheet
flares
tubes
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.)
Granted
Application number
EP04075261A
Other languages
English (en)
French (fr)
Other versions
EP1559983B1 (de
Inventor
Jacobus Elfridus Ir. Van Den Boom
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.)
MADIOEN HOLDING B.V.
Original Assignee
Oostendorp Apparatenbouw BV
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
Priority to DE602004008410T priority Critical patent/DE602004008410T2/de
Application filed by Oostendorp Apparatenbouw BV filed Critical Oostendorp Apparatenbouw BV
Priority to AT04075261T priority patent/ATE371157T1/de
Priority to EP04075261A priority patent/EP1559983B1/de
Priority to PCT/EP2005/000953 priority patent/WO2005075924A1/en
Priority to EP05701286A priority patent/EP1709383B1/de
Priority to PCT/EP2005/000952 priority patent/WO2005075923A1/en
Priority to DE602005000933T priority patent/DE602005000933T2/de
Publication of EP1559983A1 publication Critical patent/EP1559983A1/de
Application granted granted Critical
Publication of EP1559983B1 publication Critical patent/EP1559983B1/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
    • F28F9/00—Casings; Header boxes; Auxiliary supports for elements; Auxiliary members within casings
    • F28F9/02—Header boxes; End plates
    • F28F9/04—Arrangements for sealing elements into header boxes or end plates
    • F28F9/16—Arrangements for sealing elements into header boxes or end plates by permanent joints, e.g. by rolling
    • F28F9/18—Arrangements for sealing elements into header boxes or end plates by permanent joints, e.g. by rolling by welding
    • F28F9/182—Arrangements for sealing elements into header boxes or end plates by permanent joints, e.g. by rolling by welding the heat-exchange conduits having ends with a particular shape, e.g. deformed; the heat-exchange conduits or end plates having supplementary joining means, e.g. abutments

Definitions

  • the present invention according to a first aspect relates to a method for performing a welded connection between a tubesheet and a number of tubes.
  • the present invention relates to a device produced by the method according to the invention.
  • a device finds application in e.g. heat exchangers.
  • a useful application in other technical fields is not excluded.
  • tubes are welded to the tubesheet, whereby before or after the welding also expanding of the tubes may be executed.
  • leak path is the shortest way of the end of the crevice between tube and bore to the medium inside the tube seen through the weld.
  • the weld-connections provided by the prior art methods are characterised by the fact that the weld-connection is made by melting the edge of the tubesheet-borezone together with the relatively thin tube-ends, which operation is very critical in terms of amongst others a) fulfilment of specified minimal leak path at all weldpositions, b) avoiding damage or penetration of the tube end by the welding-arc, c) avoiding the blocking of a centering-device, used for automated welding, at removal due to a narrowing of the tube diameter caused by the weld.
  • the invention is aimed at providing a method for forming a connection between a tubesheet and a tube, wherein the welding operation is far less critical. This object is reached by the method according to the invention which comprises:
  • the weld arc is aimed on the circumference of the flare and tubesheet itself, several millimeters away from the edge of the tubesheet-bore zone. This makes the welding operation far less critical.
  • the leak path is freely and better controllable opposed to the traditional welding details. This because the size of the welded connection is freely controllable as the weld arc is aimed at the circumference of the flare and the tubesheet itself.
  • the new method according to the invention provides benefits for execution of re-tubing.
  • Re-tubing is some times executed to replace leaking tubes of a heat exchanger. Such leakage may occur after prolonged operation of the heat exchanger. Especially when operated under harsh conditions (e.g. very corrosive media).
  • retubing of a heat exchanger does not require cleaning of the bores in order to remove contaminations. It is sufficient to grind the surface of the tubesheet to remove any contamination which might be present.
  • a tubesheet with a first surface and a second surface is provided.
  • the tubesheet can be formed by any material which can be subjected to a welding operation and which has suitable properties for the intended use.
  • a selection of a suitable material is within the knowledge of the skilled person.
  • suitable materials can be selected from metals and metal alloys, such as (stainless) steel, nickel (alloys), copper (alloys), titanium (alloys), zirconium.
  • the material of the tubesheet may be cladded with a material which is more corrosion resistant then the base material. Suitable cladding materials may me selected from the group consisting of stainless steel, nickel (alloys), copper (alloys), titanium (alloys).
  • the tubesheet is provided with a number of circular bores extending from the first surface to the second surface.
  • a number of refers to at least one, viz. one or more, in all instances that it is used.
  • the bores can be provided by any suitable technique known to the skilled person such as drilling.
  • the bore has a diameter which enables standard tubing to be placed in the bore.
  • suitable diameters of the bore in connection with the tubing used is within the knowledge of the skilled person. Suitable guides are given in tables RCB-7.41 and RCB-7.41 M of the eight edition of the standards of the Tubular Exchanger Manufacturers Association.
  • the number of tubes provided in the method according to the invention have an exterior diameter, which enables the tube to be placed in a bore. This can be either with a tight fit, a loose fit, or a temperature dependent fit. A temperature dependant fit can be reached by cooling the pipe prior to fitting it into the bore, or heating the tubesheet prior to fitting the tube into the bore.
  • the tube is of a type which is commercially readily available. It is to be understood that the invention is not limited to the use of a specific type of tube.
  • the provided tubes are made from a pliable material, which enables them to be flared at their ends. Any pliable material can be used, as long as it can be subjected to a welding operation.
  • suitable materials can be selected from the group comprising metals, metal alloys, such as (stainless) steel, nickel (alloys), copper (alloys), titanium (alloys), zirconium.
  • Flaring of the end of the protruded portion of the tube can be done by any suitable methods known to the skilled person, e.g. by using a flaring tool.
  • the flares are made by hydrolic pressing or forming.
  • flaring can be done before a tube is placed in the bore. If the other end of a tube does not permit passage through the bore, flaring will be done after the tube is placed in a bore.
  • the welded connection between the tubesheet and each tube is made at the circumference of each flare.
  • the welded connection can be made by using known welding techniques and equipment. It is possible to make the welded connection in a single passage of the weld arc around the circumference of the flare. During such a single welding passage the material of the tube and the tubesheet is melted together. During such a single welding passage preferably welding material is deposited to strengthen the welded connection. In addition to this in the method according to the present invention deposition of weld material will increase the leak path. However, such deposition of weld material is not strictly obligatory since for some applications the melting operation will provide a welded connection with sufficient strength and leak path.
  • welding passages such as two or three or more welding passages.
  • additional welding passages can be used to further strengthen the welded connection.
  • all welding passages can be similar or different welding modes can be used. For instance, when two welding passages are used, the first welding passage can be used to prepare the path for the second welding passage by e.g. evening it. In such a case the first welding passage only melts the material of the tubesheet and the tube together, and none or little filler material is deposited. During the second subsequent welding passage, welding material is deposited.
  • a third welding passage in order to melt the deposited welding material in order to improve the weld shape.
  • the use of such a third weld passage may provide a welded connection with a flattened surface. If electric welding is used preferably the third welding passage is then performed with a higher voltage than the previous welding passages.
  • the flares are provided with a trumpet shape or a cone shape.
  • the form of the flare is a combination of a cone shape and a trumpet shape. In such a case the trumpet shape is located closer to the circumference of the flare, then the cone shape.
  • the trumpet shape or cone shape or the combined trumpet-cone shape of the flare provides a smooth flow of a fluid medium when accessing or leaving the pipe.
  • the end of the bore at the first surface is rounded and/or has the shape of a cone.
  • Such a shape of the bore end facilitated flaring the tube in a trumpet shape, a cone shape or a combined trumpet-cone shape.
  • the provided tube has a loose fit in the bore
  • the expanded tight fit of the tube in at least a part of the bore fixates the tube in the bore which is beneficial for the flaring operation.
  • a groove is located in the surface of a bore, which groove extends from the first surface in the axial direction of the bore for at least a portion of the axial length of the bore.
  • the tube has a tight fit in the bore, in the part where the groove is located, over a distance shorter then the axial length of the groove.
  • the groove can be made in any form.
  • a suitable form for making the groove is by making a screw thread. This because making a screw thread is a technique which is well known and for which many suitable devices are available.
  • the function of the groove is to provide an open channel for a fluid between the second surface and the first surface despite the tight fit of the pipe in at least a part of the bore over a distance shorter then the axial length of the groove.
  • NDT Non-Destructive Testing
  • a suitable NDT method is the soap test in which a light air-over pressure is made around the tubes on the side of the second surface.
  • the welds are than provided with a soap solution. On leaking, soap bubbles will develop which show the leak position.
  • NDT is the He-leak test.
  • a light over-pressure of Helium gas is applied around the tubes on the side of the second surface.
  • the welded connections are sniffed with special equipment, which is able to detect break trough of the very penetrable helium.
  • a third suitable NDT is the pressure test. With this test water pressure is applied around the tubes on the side of the second surface. The level of the water pressure is related to the design pressure of the tube-tubesheet assembly. During the test the pressure is monitored and leakage is detected by any observed pressure drop event or any visual leakage.
  • the remaining part of the tube not having a tight fit in the bore may be fitted tightly in the bore. This can be done by e.g. expanding the part of the tube not having a tight fit to fit tightly in the bore. During the expanding operation care is taken to avoid expanding of any part of the tube located outside the bore. In practice this can be achieved by not expanding the remaining 2-7 mm e.g. 5 mm of the tube located in the bore near the second surface. Hereby the channel formed by the groove is closed off. This provides additional sealing of the tube to tubesheet connection.
  • the bores are provided at such a distance of each other, that when the ends of the pipes are flared, the circumferences of the flares come in such proximity of each other that the welded connection at adjacent flares overlap.
  • a continuous surface is formed by the flares and the welded connections.
  • Such a continuous surface forms a coverage over the tubesheet and can have the function of a cladding layer.
  • the cladding layer may be formed by the continuous surface formed by the flares of the tubes and the welded connections. Any part of the tubesheet not covered by the continuous surface may be cladded in the usual way, or otherwise covered with a protective layer.
  • the continuous surface formed by the flares and the welded connections is ground to a smooth surface and preferably subsequently polished.
  • the presence of such a smooth continuous surface is beneficial in special applications wherein it is undesired if surface imperfections e.g. crevices etc. are present on the surface of the tubesheet. This e.g. provides a better septic quality of the tubesheet and in particular the tubesheet-bore-zone.
  • the present invention relates to a device comprising:
  • the device according to the invention finds application in heat exchangers, although application in other technical fields is not excluded.
  • the flares are provided with a trumpet shape or a cone shape.
  • the form of the flare is a combination of a cone shape and a trumpet shape.
  • the trumpet shape is located closer to the circumference of the flare, than the cone shape.
  • the trumpet shape or cone shape or the combined trumpet-cone shape of the flare provides a smooth flow of a fluid medium when accessing or leaving the tube.
  • the end of the bore at the first surface is rounded and/or has the shape of a cone.
  • Such a shape of the bore end facilitates flaring the tube in a trumpet shape, a cone shape or a combined trumpet-cone shape.
  • the tube has a tight fit in at least a part of the bore.
  • the tight fit of the tube in at least a part of the bore fixates the tube in the bore which is beneficial for the flaring operation. Furthermore, the tight fit provides additional sealing of the tube to tubesheet connection.
  • a groove is located in the surface of the bore, which groove extends from the first surface in the axial direction of the bore for at least a portion of the axial length of the bore.
  • the tube can have a tight fit in the bore, in the part where the groove is located, over a distance shorter then the axial length of the groove.
  • the function of the groove is to provide an open channel for a fluid between the second surface and the first surface despite the tight fit of the pipe in at least a part of the bore over a distance shorter then the axial length of the groove.
  • NDT Non-Destructive Testing
  • the embodiment of the device according to the invention wherein there remains an open channel between the first surface and the second surface is not (optimally) suited for use in a heat exchanger.
  • this embodiment is an important intermediate state in the production of a heat exchanger on which pressure using NDT methods can be performed.
  • the groove can have any form.
  • a suitable form of the groove is a screw thread. This because making a screw thread is a technique which is well known and for which many suitable devices are available.
  • this embodiment of the device according to the invention comprises a continuous surface formed by the flares and the welded connections.
  • a continuous surface forms a coverage over the tubesheet and can have the function of a cladding layer.
  • the cladding layer may be formed by the continuous surface formed by the flares of the tubes and the welded connections. Any part of the tubesheet not covered by the continuous surface may be cladded in the usual way, or otherwise covered with a protective layer.
  • the continuous surface is an even and smooth surface.
  • Such an even and smooth surface is beneficial in special applications wherein it is undesired if surface imperfections such as crevices etc. are present on the surface of the tubesheet. This e.g. provides a better septic quality of the tubesheet, in particular the tubesheet-bore-zone.
  • FIG. 1A shows a cross sectional overview of a so called "seal weld” known from the art.
  • This figure shows a tube 1 located in a bore of a tubesheet 2.
  • the end 3 of the tube 1 is melted together with the tubesheet 2 by the weld arc 4.
  • the weld 5 is formed by a single passage of the weld arc, whereby mostly just a little amount of weld-filler material is added or none at all.
  • this weld detail is popular because of the relatively low costs for machining, it has the disadvantage that the weld penetration is relatively small, which makes that the leak path is in principle also relatively small.
  • Figure 1B shows an alternative "seal weld".
  • the tubesheet 2 is provided with a circular incision 6 around the bore.
  • the incision 6 ensures a larger weld penetration.
  • the tubesheet gets less change on distortion by weld-shrinkage-forces, due to the fact that these forces more easily can be reduced by relaxation.
  • the appliance of a stringent set of weld parameters such as velocity, current, voltage stays very important to ensure that a sufficient leak path is obtained.
  • Figure 1C shows a so called "strength weld".
  • the tube 1 is located in the bore of a tubesheet 2.
  • the end of the bore is enlarged relative to the rest of the bore.
  • the tube 1 is fitted into the bore up to the enlarged section of the bore.
  • the tube end 3 is melted together with the tubesheet by the weld arc 4 under suppliance of weld-filler-material by supply means 7.
  • the welding is performed by two weld passages, of which formation of the root layer 8 is the most critical part of the welding process.
  • the benefit of this weld detail opposed to those shown in figures 1A and 1B, is that the leak path can be better controlled.
  • Figure 1D shows a so called “fillet weld” which is only applicable for relatively thick tubes, to avoid that the weld arc punctures the wall of the tube.
  • the tube 1 is located in the bore of the tubesheet 2, such that it protrudes with its end 3 above the second surface 11 of the tubesheet 2. Again the end of the bore of the tubesheet 2 is enlarged and the weld connections 8,9 are made in two welding passages in the enlarged part of the bore.
  • formation of the root layer 8 is the most critical part of the welding process.
  • figure 2A shows a tubesheet 2 with a first surface 10 and a second surface 11.
  • the tubesheet 2 is provided with a bore 12, in which a screw thread 13, serving as a groove, is formed.
  • the screw thread 13 starts from the first surface 10 and extends in the axial direction of the bore 12 towards the second surface 11.
  • the axial length of the screw thread is shorter than the axial length of the bore.
  • a tube 1 with an external diameter, that enables it to be placed in the bore 12 with a loose fit, is provided and placed in the bore by moving it in the direction of the arrow.
  • Figure 2B shows the position of the tube 1 in the bore 12 of the tubesheet 2, after it has been expanded to fit tightly in a portion of the bore, which portion is shorter then the axial length of the groove 13.
  • the end 3 of the tube 1 protrudes above the first surface 10 of the tubesheet 2.
  • the end of the bore in this situation is relatively unworked. However, it may be rounded of or have a trumpet, cone or a combined trumpet-cone shape.
  • the tube 1 remains to have a loose fitting in the bore on the side nearer to the second surface 11, there remains a connection 14 with the groove 13.
  • Figure 2C shows the next step in the method according to the invention.
  • the protruding end 3 of the tube 1 is flared, whereby a flare 20 is formed.
  • the welded connection is made with the weld arc 4 under suppliance of filler material by supply means 7.
  • Figure 3 shows a cross sectional overview along the lines III-III as shown in figure 4 of a preferred embodiment of the device according to the invention.
  • the remaining unexpanded part of the tube is expanded to provide a tight fit of the tube 1 in the bore 12.
  • the connection 14 is closed off.
  • the bores 12 in the tubesheet 2 are provided at a distance such that the flares 20 come in such proximity of each other that adjacent welds 22 overlap.
  • a continuous surface is formed by the flares 20 and the overlapping welds 22. This surface may be ground to an even surface and further polished to a smooth surface (not shown in figure 3) .
  • Figure 4 shows a plan overview of a preferred embodiment of the device according to the invention.
  • the device contains multiple tubes 1 connected to a tubesheet 2.
  • a continuous surface 25 which is slightly elevated, is formed by the flares and the welded connections.
  • the continuous surface 25 is ground and polished to an even and smooth surface.
  • the continuous surface 25 may serve as a cladding layer, as it fully covers the first surface 10 of the tube plate 2 located directly underneath it. The remaining uncovered part of the first surface may be covered by a different material to protect it from corrosion.
  • the device shown in figure 4 maybe applied in a heat exchanger.

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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)
  • Lining Or Joining Of Plastics Or The Like (AREA)
EP04075261A 2004-01-28 2004-01-28 Verfahren zum Verschweissen von Rohren mit einem Rohrboden und eine durch ein solches Verfahren hergestellte Vorrichtung Expired - Lifetime EP1559983B1 (de)

Priority Applications (7)

Application Number Priority Date Filing Date Title
AT04075261T ATE371157T1 (de) 2004-01-28 2004-01-28 Verfahren zum verschweissen von rohren mit einem rohrboden und eine durch ein solches verfahren hergestellte vorrichtung
EP04075261A EP1559983B1 (de) 2004-01-28 2004-01-28 Verfahren zum Verschweissen von Rohren mit einem Rohrboden und eine durch ein solches Verfahren hergestellte Vorrichtung
DE602004008410T DE602004008410T2 (de) 2004-01-28 2004-01-28 Verfahren zum Verschweissen von Rohren mit einem Rohrboden und eine durch ein solches Verfahren hergestellte Vorrichtung
EP05701286A EP1709383B1 (de) 2004-01-28 2005-01-28 Verfahren zur herstellung einer geschweissten verbindung zwischen einem rohrboden und mehreren rohren sowie durch solch ein verfahren hergestellte vorrichtung
PCT/EP2005/000953 WO2005075924A1 (en) 2004-01-28 2005-01-28 Method for forming a welded connection between a tubesheet and a number of tubes and a device produced by such method
PCT/EP2005/000952 WO2005075923A1 (en) 2004-01-28 2005-01-28 Method for forming a welded connection between a tubesheet and a number of tubes and a device produced by such method
DE602005000933T DE602005000933T2 (de) 2004-01-28 2005-01-28 Verfahren zur herstellung einer geschweissten verbindung zwischen einem rohrboden und mehreren rohren sowie durch solch ein verfahren hergestellte vorrichtung

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP04075261A EP1559983B1 (de) 2004-01-28 2004-01-28 Verfahren zum Verschweissen von Rohren mit einem Rohrboden und eine durch ein solches Verfahren hergestellte Vorrichtung

Publications (2)

Publication Number Publication Date
EP1559983A1 true EP1559983A1 (de) 2005-08-03
EP1559983B1 EP1559983B1 (de) 2007-08-22

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ID=34639449

Family Applications (2)

Application Number Title Priority Date Filing Date
EP04075261A Expired - Lifetime EP1559983B1 (de) 2004-01-28 2004-01-28 Verfahren zum Verschweissen von Rohren mit einem Rohrboden und eine durch ein solches Verfahren hergestellte Vorrichtung
EP05701286A Expired - Lifetime EP1709383B1 (de) 2004-01-28 2005-01-28 Verfahren zur herstellung einer geschweissten verbindung zwischen einem rohrboden und mehreren rohren sowie durch solch ein verfahren hergestellte vorrichtung

Family Applications After (1)

Application Number Title Priority Date Filing Date
EP05701286A Expired - Lifetime EP1709383B1 (de) 2004-01-28 2005-01-28 Verfahren zur herstellung einer geschweissten verbindung zwischen einem rohrboden und mehreren rohren sowie durch solch ein verfahren hergestellte vorrichtung

Country Status (4)

Country Link
EP (2) EP1559983B1 (de)
AT (1) ATE371157T1 (de)
DE (2) DE602004008410T2 (de)
WO (2) WO2005075924A1 (de)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR100869896B1 (ko) 2007-07-05 2008-11-24 한국가스공사 가스히터 튜브번들 건전성 검사방법
EP3742099A1 (de) * 2019-05-23 2020-11-25 Valeo Termico S.A. Wärmetauscher
CN113996964A (zh) * 2021-12-30 2022-02-01 常州新海飞金属制品有限公司 一种管板焊接方法、管体与管板连接方法及换热器

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US9039814B2 (en) * 2013-04-18 2015-05-26 Saes Pure Gas, Inc. System and method for welding a plurality of small diameter palladium alloy tubes to a common base plate in a space efficient manner
US10782500B1 (en) 2019-10-25 2020-09-22 Afl Telecommunications Llc Fiber optic furcation units, kits, and methods

Citations (5)

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Publication number Priority date Publication date Assignee Title
US1583758A (en) * 1923-04-09 1926-05-04 Winslown Safety Highpressure B Method of constructing boilers
US2451786A (en) * 1945-01-30 1948-10-19 Tech Studien Ag Multitubular heat exchanger
US3207215A (en) * 1961-06-02 1965-09-21 Raypak Inc Heat exchanger
US3628923A (en) * 1968-10-24 1971-12-21 Texas Instruments Inc Method of making header joint for a clad tubulation
US3979810A (en) * 1974-11-30 1976-09-14 Balcke-Durr Aktiengesellschaft Method of hermetically swaging tubes into tube plates

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Publication number Priority date Publication date Assignee Title
US2405399A (en) * 1943-09-22 1946-08-06 Bugg Tube beading and expanding tool and method
US3258067A (en) * 1964-06-01 1966-06-28 Fleur Corp Heat exchanger
DE2204167A1 (de) * 1972-01-29 1973-08-09 Krupp Gmbh Waermetauscher und verfahren zu seiner herstellung
JPS61216821A (ja) * 1985-03-20 1986-09-26 Hitachi Ltd 薄板と管状部材との固着方法

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1583758A (en) * 1923-04-09 1926-05-04 Winslown Safety Highpressure B Method of constructing boilers
US2451786A (en) * 1945-01-30 1948-10-19 Tech Studien Ag Multitubular heat exchanger
US3207215A (en) * 1961-06-02 1965-09-21 Raypak Inc Heat exchanger
US3628923A (en) * 1968-10-24 1971-12-21 Texas Instruments Inc Method of making header joint for a clad tubulation
US3979810A (en) * 1974-11-30 1976-09-14 Balcke-Durr Aktiengesellschaft Method of hermetically swaging tubes into tube plates

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR100869896B1 (ko) 2007-07-05 2008-11-24 한국가스공사 가스히터 튜브번들 건전성 검사방법
EP3742099A1 (de) * 2019-05-23 2020-11-25 Valeo Termico S.A. Wärmetauscher
CN113996964A (zh) * 2021-12-30 2022-02-01 常州新海飞金属制品有限公司 一种管板焊接方法、管体与管板连接方法及换热器
CN113996964B (zh) * 2021-12-30 2022-03-18 常州新海飞金属制品有限公司 一种管板焊接方法、管体与管板连接方法及换热器

Also Published As

Publication number Publication date
EP1709383B1 (de) 2007-04-18
DE602004008410D1 (de) 2007-10-04
ATE371157T1 (de) 2007-09-15
WO2005075923A1 (en) 2005-08-18
EP1559983B1 (de) 2007-08-22
WO2005075924A1 (en) 2005-08-18
DE602004008410T2 (de) 2008-05-15
DE602005000933T2 (de) 2009-10-08
DE602005000933D1 (de) 2007-05-31
EP1709383A1 (de) 2006-10-11

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