WO1998022769A1 - Heat exchanger tube and method of manufacturing same - Google Patents

Heat exchanger tube and method of manufacturing same Download PDF

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Publication number
WO1998022769A1
WO1998022769A1 PCT/NL1997/000640 NL9700640W WO9822769A1 WO 1998022769 A1 WO1998022769 A1 WO 1998022769A1 NL 9700640 W NL9700640 W NL 9700640W WO 9822769 A1 WO9822769 A1 WO 9822769A1
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WO
WIPO (PCT)
Prior art keywords
tube
profiles
heat exchanger
inner tube
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.)
Ceased
Application number
PCT/NL1997/000640
Other languages
French (fr)
Inventor
Franciscus Roffelsen
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.)
Spiro Research NV
Original Assignee
Spiro Research NV
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 Spiro Research NV filed Critical Spiro Research NV
Priority to AT97947987T priority Critical patent/ATE205590T1/en
Priority to DK97947987T priority patent/DK0941444T3/en
Priority to US09/308,481 priority patent/US6192583B1/en
Priority to DE69706702T priority patent/DE69706702T2/en
Priority to EP97947987A priority patent/EP0941444B1/en
Priority to JP52351298A priority patent/JP3314087B2/en
Priority to AU54148/98A priority patent/AU5414898A/en
Priority to CA002272421A priority patent/CA2272421C/en
Publication of WO1998022769A1 publication Critical patent/WO1998022769A1/en
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28D—HEAT-EXCHANGE APPARATUS, NOT PROVIDED FOR IN ANOTHER SUBCLASS, IN WHICH THE HEAT-EXCHANGE MEDIA DO NOT COME INTO DIRECT CONTACT
    • F28D7/00—Heat-exchange apparatus having stationary tubular conduit assemblies for both heat-exchange media, the media being in contact with different sides of a conduit wall
    • F28D7/10—Heat-exchange apparatus having stationary tubular conduit assemblies for both heat-exchange media, the media being in contact with different sides of a conduit wall the conduits being arranged one within the other, e.g. concentrically
    • F28D7/106—Heat-exchange apparatus having stationary tubular conduit assemblies for both heat-exchange media, the media being in contact with different sides of a conduit wall the conduits being arranged one within the other, e.g. concentrically consisting of two coaxial conduits or modules of two coaxial conduits
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
    • F28F1/00—Tubular elements; Assemblies of tubular elements
    • F28F1/003—Multiple wall conduits, e.g. for leak detection
    • 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
    • Y10T29/49361—Tube inside tube

Definitions

  • the invention relates to a heat exchanger tube for transferring heat from a flowing medium to another flowing medium, which tube is composed of a metal outer tube and a metal inner tube, whose facing surfaces are provided with substantially complementary profiles and rigidly abut against each other to form at least one longitudinal channel for leak detection extending between the outer tube and the inner tube.
  • the invention also relates to a method of manufacturing such heat exchanger tube .
  • Such heat exchanger tube is known from
  • GB-A-2 109 913 The outer and inner tubes which together form the double-walled heat exchanger tube are fed as smooth tubes to a deforming apparatus, which initially reduces the tubes in diameter, with fins being formed on the outer tube. At the end of the deforming process, the parts of the outer tube located between the fins, together with corresponding parts of the inner tube, are pressed inwards, so that a corrugated, double-walled tube is created, with a leak-detection channel remaining each time between two inwardly pressed corrugated parts of the double-walled tube.
  • this heat exchanger tube does not guarantee that in the case of substantial temperature differences and fluctuations between the media on either side of the double- walled heat exchanger tube or in one of the media, the facial contact between the inner and the outer tube, which is to provide the desired, proper heat transfer, is maintained in the manner required. Tests have shown that as a consequence of the expansion and/or shrinking movements of the inner and/or outer tube, a slowly progressing splitting occurs between the two tubes, which gradually reduces the heat transfer capacity to a minimum.
  • the object of the invention is to provide a heat exchanger tube of the type described in the opening paragraph, wherein the above problems no longer occur.
  • the heat exchanger tube according to the invention is characterized in that the profiles are in undercut engagement in such a manner that when the inner tube shrinks relative to the outer tube and/or the outer tube expands relative to the inner tube, the parts which are in undercut engagement are pulled against each other more firmly.
  • a heat exchanger tube is obtained which can be manufactured in a relatively simple and inexpensive manner and which, because of the facial contact which is yet intensified during temperature deformations, also remains functioning optimally during the occurrence of relatively substantial temperature fluctuations and alternations.
  • a longitudinal channel can be formed by providing grooves on or in the profiles.
  • longitudinal channels for leak detection can be provided in a particularly easy manner if at least the profile of the inner or outer tube has its free edge portion rounded or bevelled. In this manner, a number of circumferentially distributed longitudinal channels can be readily formed, which can be coupled in a known manner to leak detectors or sensors .
  • the profiles of the outer and inner tubes, in cross section have a continuously widening shape in the direction of the free end, the engaging surfaces of the outer and inner tubes can be brought into and held in a close and firm contact, which contact is additionally intensified during temperature fluctuations owing to wedge- like clamping action.
  • Such construction can be realized in a relatively simple manner when the profiles of the outer and/or inner tube in cross section have the shape of an isosceles trapezium, so that, during shrinking of the inner tube and/or expansion of the outer tube, the profiles are pulled into firmer contact on account of their interlocking dovetail forms, as a result of which an optimum abutment, and hence a proper heat transfer, is and remains guaranteed.
  • a preferred embodiment is obtained when the profiles of the outer and inner tubes are provided in the form of screw threads, the arrangement being such that the profiles of the inner and outer tubes can be brought into screw thread engagement with each other.
  • the profiles of the outer and inner tubes are designed as longitudinally extending ribs, the arrangement being such that the profiles of the inner and outer tubes can engage with each other as longitudinal teeth.
  • the invention also provides a method of manufacturing such heat exchanger tube, wherein the inner tube and the outer tube are provided with the desired profiles, the inner tube is inserted into the outer tube and the thus assembled tubes can undergo, in a drawing process through cold deformation, such a change in diameter that the profiled outer wall of the inner tube is omnilaterally and without play clamped against the profiled inner wall of the outer tube.
  • the manufacture of the inner and outer tubes can take place with relatively wide tolerances, so that the tubes are easy to assemble, while after deformation, the inner and outer tubes act as a single tube which is resistant to strong temperature fluctuations and alternations and which always guarantees an optimum heat transfer.
  • the inner diameter of the outer tube can be reduced and/or the outer diameter of the inner tube can be increased during the drawing process, to arrive at an assembly which functions as one whole.
  • the inner and outer tubes can be assembled in a particularly easy manner if those tubes are designed so that the inner tube can be inserted into the outer tube through screwing or sliding.
  • the invention will be specified on the basis of two exemplary embodiments of a heat exchanger tube according to the invention, with reference to the accompanying drawing. In this drawing:
  • Fig. 1 shows a first embodiment in longitudinal section; and Fig. 2 shows a second embodiment in cross section.
  • Fig. 1 shows, in longitudinal section, a heat exchanger 1, formed by a heat exchanger tube 4 consisting of two tubes 2, 3 and an element provided therearound, for instance a third tube 5.
  • the heat exchanger tube 4 keeps a space 6 for a first medium separated from a space 7 for a second medium.
  • the outer tube 2 and the inner tube 3 of the heat exchanger tube 4 have, on their facing surfaces, a screw thread-shaped profile 8 and 9 respectively, which profiles interlock.
  • the free edge portions of the screw thread-shaped profiles 8 and 9 are bevelled to provide four spiral-shaped channels 10, 11 and 12, 13 respectively, which extend in longitudinal direction of the heat exchanger tube 4 and can be used in a known manner for leak detection. However, it is also possible to bevel the edge portions of one profile 8 or 9 only, which results in two longitudinal channels 10, 11 or 12, 13.
  • Fig. 2 shows, in cross section, a heat exchanger tube 4' consisting of an outer tube 2' having an inner profile 8' and an inner tube 3' having an outer profile 9' .
  • the profiles 8 ' , 9 ' consist of longitudinally extending ribs which interlock as longitudinal teeth.
  • the free edges of the profiles 8' and 9' are bevelled and form, per inner or outer tooth, four channels 10', 11', 12', 13', extending linearly in longitudinal direction of the heat exchanger tube 4 ' .
  • the profile 8 ' of the outer tube 2' has a rectangular cross section, while the profile 9 ' of the inner tube 3 ' in cross section has the shape of an isosceles, inverted trapezium.
  • a heat exchanger tube according to Fig. 1 or 2 can be manufactured by first providing the profiles 8, 9 or 8 ' , 9' on the inner and outer tubes 2, 3 or 2', 3', followed by screwing or sliding the inner tube 3 or 3 ' into the outer tube 2 or 2' . After that, the assembled tubes are deformed in a drawing process through cold deformation so that the individual tube walls of the outer and inner tubes 2, 3 or 2 ' 3' are as it were compressed into one single tube wall. Because during the drawing process, the outer diameter of the outer tube 2 or 2 ' is reduced and/or the inner diameter of the inner tube 3 or 3 ' is increased, for instance by means of a drawing die, the assembly is deformed to become a heat exchanger tube reacting as a one-piece conduit.
  • the profiles may also have different shapes, such as for instance a longitudinally extending T-section.
  • grooves may be provided in the side portions of the profiles or in the facing surfaces of the inner and outer tubes, which grooves constitute the longitudinal channels for a leak detection.

Landscapes

  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Heat-Exchange Devices With Radiators And Conduit Assemblies (AREA)
  • Making Paper Articles (AREA)
  • Rigid Pipes And Flexible Pipes (AREA)

Abstract

Heat exchanger tube (4; 4') composed of a metal outer tube (2; 2') having inner profile (8; 8') and a metal inner tube (3; 3') having outer profile (9; 9'), wherein the profiles are in undercut engagement with each other so that the inner and outer tubes are in rigid abutment without play, and at least one longitudinal channel (10, 11; 10', 11') is provided for leak detection, formed between the outer tube and the inner tube. The heat exchanger tube can be manufactured by designing the profiles so that the inner and outer tubes can be screwed or slid one into the other, after which the tubes can be brought into a play-free, rigidly abutting configuration through deformation, for instance by means of a drawing die.

Description

Title: Heat exchanger tube and method of manufacturing' same
The invention relates to a heat exchanger tube for transferring heat from a flowing medium to another flowing medium, which tube is composed of a metal outer tube and a metal inner tube, whose facing surfaces are provided with substantially complementary profiles and rigidly abut against each other to form at least one longitudinal channel for leak detection extending between the outer tube and the inner tube. The invention also relates to a method of manufacturing such heat exchanger tube . Such heat exchanger tube is known from
GB-A-2 109 913. The outer and inner tubes which together form the double-walled heat exchanger tube are fed as smooth tubes to a deforming apparatus, which initially reduces the tubes in diameter, with fins being formed on the outer tube. At the end of the deforming process, the parts of the outer tube located between the fins, together with corresponding parts of the inner tube, are pressed inwards, so that a corrugated, double-walled tube is created, with a leak-detection channel remaining each time between two inwardly pressed corrugated parts of the double-walled tube.
However, this heat exchanger tube does not guarantee that in the case of substantial temperature differences and fluctuations between the media on either side of the double- walled heat exchanger tube or in one of the media, the facial contact between the inner and the outer tube, which is to provide the desired, proper heat transfer, is maintained in the manner required. Tests have shown that as a consequence of the expansion and/or shrinking movements of the inner and/or outer tube, a slowly progressing splitting occurs between the two tubes, which gradually reduces the heat transfer capacity to a minimum.
The object of the invention is to provide a heat exchanger tube of the type described in the opening paragraph, wherein the above problems no longer occur. To that end, the heat exchanger tube according to the invention is characterized in that the profiles are in undercut engagement in such a manner that when the inner tube shrinks relative to the outer tube and/or the outer tube expands relative to the inner tube, the parts which are in undercut engagement are pulled against each other more firmly.
By virtue of the features of the invention, a heat exchanger tube is obtained which can be manufactured in a relatively simple and inexpensive manner and which, because of the facial contact which is yet intensified during temperature deformations, also remains functioning optimally during the occurrence of relatively substantial temperature fluctuations and alternations. In this regard, a longitudinal channel can be formed by providing grooves on or in the profiles. According to a preferred embodiment of the invention, however, longitudinal channels for leak detection can be provided in a particularly easy manner if at least the profile of the inner or outer tube has its free edge portion rounded or bevelled. In this manner, a number of circumferentially distributed longitudinal channels can be readily formed, which can be coupled in a known manner to leak detectors or sensors . If, according to a further embodiment of the invention, the profiles of the outer and inner tubes, in cross section, have a continuously widening shape in the direction of the free end, the engaging surfaces of the outer and inner tubes can be brought into and held in a close and firm contact, which contact is additionally intensified during temperature fluctuations owing to wedge- like clamping action. Such construction can be realized in a relatively simple manner when the profiles of the outer and/or inner tube in cross section have the shape of an isosceles trapezium, so that, during shrinking of the inner tube and/or expansion of the outer tube, the profiles are pulled into firmer contact on account of their interlocking dovetail forms, as a result of which an optimum abutment, and hence a proper heat transfer, is and remains guaranteed.
A preferred embodiment is obtained when the profiles of the outer and inner tubes are provided in the form of screw threads, the arrangement being such that the profiles of the inner and outer tubes can be brought into screw thread engagement with each other. In another particularly advantageous embodiment, the profiles of the outer and inner tubes are designed as longitudinally extending ribs, the arrangement being such that the profiles of the inner and outer tubes can engage with each other as longitudinal teeth. The invention also provides a method of manufacturing such heat exchanger tube, wherein the inner tube and the outer tube are provided with the desired profiles, the inner tube is inserted into the outer tube and the thus assembled tubes can undergo, in a drawing process through cold deformation, such a change in diameter that the profiled outer wall of the inner tube is omnilaterally and without play clamped against the profiled inner wall of the outer tube. Owing to this method, the manufacture of the inner and outer tubes can take place with relatively wide tolerances, so that the tubes are easy to assemble, while after deformation, the inner and outer tubes act as a single tube which is resistant to strong temperature fluctuations and alternations and which always guarantees an optimum heat transfer. By means of for instance a drawing die, the inner diameter of the outer tube can be reduced and/or the outer diameter of the inner tube can be increased during the drawing process, to arrive at an assembly which functions as one whole.
In this regard, the inner and outer tubes can be assembled in a particularly easy manner if those tubes are designed so that the inner tube can be inserted into the outer tube through screwing or sliding. Hereinafter, the invention will be specified on the basis of two exemplary embodiments of a heat exchanger tube according to the invention, with reference to the accompanying drawing. In this drawing:
Fig. 1 shows a first embodiment in longitudinal section; and Fig. 2 shows a second embodiment in cross section.
Fig. 1 shows, in longitudinal section, a heat exchanger 1, formed by a heat exchanger tube 4 consisting of two tubes 2, 3 and an element provided therearound, for instance a third tube 5. The heat exchanger tube 4 keeps a space 6 for a first medium separated from a space 7 for a second medium. The outer tube 2 and the inner tube 3 of the heat exchanger tube 4 have, on their facing surfaces, a screw thread-shaped profile 8 and 9 respectively, which profiles interlock. In cross section, the screw thread-shaped profiles 8,
9 have the shape of an isosceles, inverted trapezium, which is preferred in particular if the temperature differences between one medium in the space 6 and the other medium in the space 7 or in a medium itself are substantial. The dovetail- shaped engagement of the screw thread-shaped profiles 8, 9 prevents the so-called "splitting apart" of the two tubes 2, 3 which constitute the heat exchanger tube 4, with expansion of the outer tube 2 and/or shrinkage of the inner tube 3 resulting in the flanks of the profiles 8 and 9 pressing against each other more firmly.
The free edge portions of the screw thread-shaped profiles 8 and 9 are bevelled to provide four spiral-shaped channels 10, 11 and 12, 13 respectively, which extend in longitudinal direction of the heat exchanger tube 4 and can be used in a known manner for leak detection. However, it is also possible to bevel the edge portions of one profile 8 or 9 only, which results in two longitudinal channels 10, 11 or 12, 13.
Fig. 2 shows, in cross section, a heat exchanger tube 4' consisting of an outer tube 2' having an inner profile 8' and an inner tube 3' having an outer profile 9' . The profiles 8 ' , 9 ' consist of longitudinally extending ribs which interlock as longitudinal teeth. In this exemplary embodiment, too, the free edges of the profiles 8' and 9' are bevelled and form, per inner or outer tooth, four channels 10', 11', 12', 13', extending linearly in longitudinal direction of the heat exchanger tube 4 ' . The profile 8 ' of the outer tube 2' has a rectangular cross section, while the profile 9 ' of the inner tube 3 ' in cross section has the shape of an isosceles, inverted trapezium. A heat exchanger tube according to Fig. 1 or 2 can be manufactured by first providing the profiles 8, 9 or 8 ' , 9' on the inner and outer tubes 2, 3 or 2', 3', followed by screwing or sliding the inner tube 3 or 3 ' into the outer tube 2 or 2' . After that, the assembled tubes are deformed in a drawing process through cold deformation so that the individual tube walls of the outer and inner tubes 2, 3 or 2 ' 3' are as it were compressed into one single tube wall. Because during the drawing process, the outer diameter of the outer tube 2 or 2 ' is reduced and/or the inner diameter of the inner tube 3 or 3 ' is increased, for instance by means of a drawing die, the assembly is deformed to become a heat exchanger tube reacting as a one-piece conduit.
It is readily understood that within the framework of the invention as laid down in the appended claims still many other modifications and variants are possible. For instance, the profiles may also have different shapes, such as for instance a longitudinally extending T-section. Also, grooves may be provided in the side portions of the profiles or in the facing surfaces of the inner and outer tubes, which grooves constitute the longitudinal channels for a leak detection.

Claims

Claims
1. A heat exchanger tube (4; 4') for transferring heat from a flowing medium to another flowing medium, said tube being composed of a metal outer tube (2; 2') and a metal inner tube (3; 3'), whose facing surfaces are provided with substantially complementary profiles (8, 9; 8', 9') and are in rigid abutment to form at least one longitudinal channel
(10, 11; 10', 11') for leak detection extending between the outer tube and the inner tube, characterized in that the profiles (8, 9; 8', 9') are in undercut engagement in such a manner that when the inner tube (3, 3') shrinks relative to the outer tube (2, 2') and/or the outer tube expands relative to the inner tube, the parts which are in undercut engagement are pulled together more firmly.
2. A heat exchanger tube according to claim 1, characterized in that the profiles (8, 9; 8', 9') of the outer or inner tube (2, 3; 2', 3') have their free edge portions rounded or bevelled.
3. A heat exchanger tube according to claim 1 or 2 , characterized in that in cross section, the profiles (8, 9; 9') of the outer and/or the inner tube (2, 3; 3') have a continuously widening shape in the direction of the free end.
4. A heat exchanger tube according to claim 3, characterized in that in cross section, the profiles (8, 9; 9') of the outer and/or inner tube (2, 3; 3') have the shape of an inverted isosceles trapezium.
5. A heat exchanger tube according to at least one of claims 1-4, characterized in that the profiles (8, 9) of the outer and inner tubes (2, 3) are provided so as to be screw thread-shaped, the arrangement being such that the profiles of the inner and outer tubes can engage with each other as screw thread.
6. A heat exchanger according to at least one of claims 1-4, characterized in that the profiles (81, 9') of the outer and inner tubes (2', 3') are designed as longitudinally extending ribs, the arrangement being such that the profiles of the inner and outer tubes can engage with each other as longitudinal teeth.
7. A method of manufacturing a heat exchanger tube according to at least one of claims 1-6, characterized in that the inner tube (3; 3') and the outer tube (2; 2') are provided with the desired profiles (8, 9; 8', 9'), the inner tube is inserted into the outer tube and the thus assembled tubes undergo, in a drawing process through cold deformation, such a change of diameter that the profiled outer wall of the inner tube is omnilaterally clamped without play against the profiled inner wall of the outer tube.
8. A method according to claim 7, characterized in that during the drawing process, the inner diameter of the outer tube (3; 3') is reduced and/or the outer diameter of the inner tube (2; 2') is increased.
9. A method according to claim 7 or 8 , characterized in that the inner tube (3) and the outer tube (2) are provided with corresponding screw thread-shaped profiles (8, 9) and are assembled by screwing one into the other.
10. A method according to claim 7 or 8 , characterized in that the inner tube (3') and the outer tube (2') are provided with corresponding, longitudinally extending profiles (8'; 9') and are assembled by sliding one into the other.
PCT/NL1997/000640 1996-11-22 1997-11-24 Heat exchanger tube and method of manufacturing same Ceased WO1998022769A1 (en)

Priority Applications (8)

Application Number Priority Date Filing Date Title
AT97947987T ATE205590T1 (en) 1996-11-22 1997-11-24 HEAT EXCHANGER TUBE AND PRODUCTION THEREOF
DK97947987T DK0941444T3 (en) 1996-11-22 1997-11-24 Heat exchanger tubes and method for making the same
US09/308,481 US6192583B1 (en) 1996-11-22 1997-11-24 Heat exchanger tube and method of manufacturing same
DE69706702T DE69706702T2 (en) 1996-11-22 1997-11-24 HEAT EXCHANGER PIPE AND THEIR PRODUCTION
EP97947987A EP0941444B1 (en) 1996-11-22 1997-11-24 Heat exchanger tube and method of manufacturing same
JP52351298A JP3314087B2 (en) 1996-11-22 1997-11-24 Heat exchanger tube and method of manufacturing the same
AU54148/98A AU5414898A (en) 1996-11-22 1997-11-24 Heat exchanger tube and method of manufacturing same
CA002272421A CA2272421C (en) 1996-11-22 1997-11-24 Heat exchanger tube and method of manufacturing same

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
NL1004592 1996-11-22
NL1004592A NL1004592C2 (en) 1996-11-22 1996-11-22 Heat exchanger tube and manufacturing method therefor.

Publications (1)

Publication Number Publication Date
WO1998022769A1 true WO1998022769A1 (en) 1998-05-28

Family

ID=19763921

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/NL1997/000640 Ceased WO1998022769A1 (en) 1996-11-22 1997-11-24 Heat exchanger tube and method of manufacturing same

Country Status (12)

Country Link
US (1) US6192583B1 (en)
EP (1) EP0941444B1 (en)
JP (1) JP3314087B2 (en)
AT (1) ATE205590T1 (en)
AU (1) AU5414898A (en)
CA (1) CA2272421C (en)
DE (1) DE69706702T2 (en)
DK (1) DK0941444T3 (en)
ES (1) ES2163200T3 (en)
NL (1) NL1004592C2 (en)
PT (1) PT941444E (en)
WO (1) WO1998022769A1 (en)

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WO2017102227A1 (en) * 2015-12-18 2017-06-22 Sandvik Materials Technology Deutschland Gmbh A method for manufacturing a tube of metal as well as a tube of metal
WO2018229262A1 (en) * 2017-06-16 2018-12-20 Sandvik Intellectual Property Ab A tube structure and a method for manufactoring a tube structure

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NL1012676C2 (en) * 1999-07-22 2001-01-23 Spiro Research Bv Method for manufacturing a double-walled heat exchanger tube with leak detection and such a heat exchanger tube.
JP4294255B2 (en) * 2002-03-28 2009-07-08 住友精密工業株式会社 Manufacturing method of open rack heat exchanger
US7063132B2 (en) * 2003-12-29 2006-06-20 Bradford White Corporation Multi-wall heat exchanger for a water heater
US9638770B2 (en) * 2004-05-21 2017-05-02 Devicor Medical Products, Inc. MRI biopsy apparatus incorporating an imageable penetrating portion
US7708751B2 (en) * 2004-05-21 2010-05-04 Ethicon Endo-Surgery, Inc. MRI biopsy device
US8932233B2 (en) 2004-05-21 2015-01-13 Devicor Medical Products, Inc. MRI biopsy device
US8333108B2 (en) * 2004-06-30 2012-12-18 Valeo, Inc. Detection system for localizing defective seals in heat exchangers
JP4862972B1 (en) * 2010-06-04 2012-01-25 住友金属工業株式会社 Crevice double pipe and its manufacturing method
JP5687182B2 (en) * 2011-12-16 2015-03-18 株式会社コベルコ マテリアル銅管 Heat transfer tube with leak detection function and outer tube used for it
CN106643272A (en) * 2016-11-15 2017-05-10 杭州创屹机电科技有限公司 Heat exchange pipe
US11369985B2 (en) * 2019-10-04 2022-06-28 Delavan Inc Fluid conduits with heat shielding

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WO2017102227A1 (en) * 2015-12-18 2017-06-22 Sandvik Materials Technology Deutschland Gmbh A method for manufacturing a tube of metal as well as a tube of metal
KR20180096690A (en) * 2015-12-18 2018-08-29 산드빅 마테리알스 테크놀로지 도이칠란트 게엠베하 METHOD FOR MANUFACTURING TUBES OF METALS AND METAL TUBES
CN108778547A (en) * 2015-12-18 2018-11-09 山特维克原料技术德国公开股份有限公司 Pipe made of the method for pipe and a kind of metal made of a kind of manufacture metal
US10724658B2 (en) 2015-12-18 2020-07-28 Sandvik Materials Technology Deutschland Gmbh Method for manufacturing a tube of metal as well as a tube of metal
KR102696524B1 (en) 2015-12-18 2024-08-19 산드빅 마테리알스 테크놀로지 도이칠란트 게엠베하 A method for manufacturing a tube of metal, a tube of metal and a system comprising a tube of metal
WO2018229262A1 (en) * 2017-06-16 2018-12-20 Sandvik Intellectual Property Ab A tube structure and a method for manufactoring a tube structure
CN110809498A (en) * 2017-06-16 2020-02-18 山特维克知识产权股份有限公司 Tube structure and method for manufacturing a tube structure
US11084077B2 (en) 2017-06-16 2021-08-10 Sandvik Intellectual Property Ab Tube structure and a method for manufacturing a tube structure

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Publication number Publication date
EP0941444B1 (en) 2001-09-12
ES2163200T3 (en) 2002-01-16
AU5414898A (en) 1998-06-10
NL1004592C2 (en) 1998-06-08
JP2000507694A (en) 2000-06-20
DK0941444T3 (en) 2002-01-28
DE69706702D1 (en) 2001-10-18
CA2272421A1 (en) 1998-05-28
EP0941444A1 (en) 1999-09-15
JP3314087B2 (en) 2002-08-12
US6192583B1 (en) 2001-02-27
PT941444E (en) 2002-02-28
CA2272421C (en) 2003-09-23
DE69706702T2 (en) 2002-07-11
ATE205590T1 (en) 2001-09-15

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