ES2018280B3 - Procedimiento y dispositivo de encamisado de un tubo periferico de un generador de vapor. - Google Patents

Procedimiento y dispositivo de encamisado de un tubo periferico de un generador de vapor.

Info

Publication number
ES2018280B3
ES2018280B3 ES87400782T ES87400782T ES2018280B3 ES 2018280 B3 ES2018280 B3 ES 2018280B3 ES 87400782 T ES87400782 T ES 87400782T ES 87400782 T ES87400782 T ES 87400782T ES 2018280 B3 ES2018280 B3 ES 2018280B3
Authority
ES
Spain
Prior art keywords
procedure
coating
steam generator
peripheral pipe
peripheral
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
ES87400782T
Other languages
English (en)
Inventor
Jean-Pierre Cartry
Bruno Fraissenet
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 NP SAS
Original Assignee
Framatome 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
Application filed by Framatome SA filed Critical Framatome SA
Application granted granted Critical
Publication of ES2018280B3 publication Critical patent/ES2018280B3/es
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Classifications

    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28HEAT EXCHANGE IN GENERAL
    • F28FDETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
    • F28F11/00Arrangements for sealing leaky tubes and conduits
    • F28F11/02Arrangements for sealing leaky tubes and conduits using obturating elements, e.g. washers, inserted and operated independently of each other
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B21MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21DWORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D39/00Application of procedures in order to connect objects or parts, e.g. coating with sheet metal otherwise than by plating; Tube expanders
    • B21D39/06Application of procedures in order to connect objects or parts, e.g. coating with sheet metal otherwise than by plating; Tube expanders of tubes in openings, e.g. rolling-in
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B23MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23PMETAL-WORKING NOT OTHERWISE PROVIDED FOR; COMBINED OPERATIONS; UNIVERSAL MACHINE TOOLS
    • B23P19/00Machines for simply fitting together or separating metal parts or objects, or metal and non-metal parts, whether or not involving some deformation; Tools or devices therefor so far as not provided for in other classes
    • B23P19/02Machines for simply fitting together or separating metal parts or objects, or metal and non-metal parts, whether or not involving some deformation; Tools or devices therefor so far as not provided for in other classes for connecting objects by press fit or for detaching same
    • B23P19/022Extracting or inserting relatively long parts
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F22STEAM GENERATION
    • F22BMETHODS OF STEAM GENERATION; STEAM BOILERS
    • F22B37/00Component parts or details of steam boilers
    • F22B37/002Component parts or details of steam boilers specially adapted for nuclear steam generators, e.g. maintenance, repairing or inspecting equipment not otherwise provided for
    • F22B37/003Maintenance, repairing or inspecting equipment positioned in or via the headers
    • YGENERAL 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
    • Y10TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10TTECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T29/00Metal working
    • Y10T29/49Method of mechanical manufacture
    • Y10T29/4935Heat exchanger or boiler making
    • Y10T29/49352Repairing, converting, servicing or salvaging
    • YGENERAL 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
    • Y10TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10TTECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T29/00Metal working
    • Y10T29/49Method of mechanical manufacture
    • Y10T29/4935Heat exchanger or boiler making
    • Y10T29/49387Boiler making
    • YGENERAL 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
    • Y10TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10TTECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T29/00Metal working
    • Y10T29/49Method of mechanical manufacture
    • Y10T29/49718Repairing
    • Y10T29/49732Repairing by attaching repair preform, e.g., remaking, restoring, or patching
    • YGENERAL 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
    • Y10TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10TTECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T29/00Metal working
    • Y10T29/49Method of mechanical manufacture
    • Y10T29/49826Assembling or joining
    • Y10T29/49908Joining by deforming
    • Y10T29/49938Radially expanding part in cavity, aperture, or hollow body
    • Y10T29/4994Radially expanding internal tube
    • YGENERAL 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
    • Y10TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10TTECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T29/00Metal working
    • Y10T29/53Means to assemble or disassemble
    • Y10T29/531Nuclear device
    • YGENERAL 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
    • Y10TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10TTECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T29/00Metal working
    • Y10T29/53Means to assemble or disassemble
    • Y10T29/53113Heat exchanger
    • Y10T29/53122Heat exchanger including deforming means

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • General Engineering & Computer Science (AREA)
  • High Energy & Nuclear Physics (AREA)
  • Lining Or Joining Of Plastics Or The Like (AREA)
ES87400782T 1986-04-30 1987-04-07 Procedimiento y dispositivo de encamisado de un tubo periferico de un generador de vapor. Expired - Lifetime ES2018280B3 (es)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR8606344A FR2598202B1 (fr) 1986-04-30 1986-04-30 Procede de chemisage d'un tube peripherique d'un generateur de vapeur.

Publications (1)

Publication Number Publication Date
ES2018280B3 true ES2018280B3 (es) 1991-04-01

Family

ID=9334831

Family Applications (1)

Application Number Title Priority Date Filing Date
ES87400782T Expired - Lifetime ES2018280B3 (es) 1986-04-30 1987-04-07 Procedimiento y dispositivo de encamisado de un tubo periferico de un generador de vapor.

Country Status (8)

Country Link
US (3) US4827594A (es)
EP (1) EP0245134B1 (es)
JP (1) JPS62263833A (es)
CA (1) CA1287483C (es)
DE (1) DE3765455D1 (es)
ES (1) ES2018280B3 (es)
FR (1) FR2598202B1 (es)
ZA (1) ZA872789B (es)

Families Citing this family (66)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB8920382D0 (en) * 1989-09-08 1989-10-25 Nnc Ltd Heat exchangers
US5062199A (en) * 1990-01-11 1991-11-05 Haskel, Inc. Apparatus for radially expanding and anchoring sleeves within tubes
US5009002A (en) * 1990-01-11 1991-04-23 Haskel, Inc. Method for radially expanding and anchoring sleeves within tubes
US5201118A (en) * 1992-03-09 1993-04-13 Mcparland Kevin W Process for repairing heat-exchanger tubes
US5367768A (en) * 1992-12-17 1994-11-29 Mpr Associates, Inc. Methods of repairing inconel 600 nozzles of pressurized water reactor vessels
US5557840A (en) * 1995-02-13 1996-09-24 J. E. Miller Inc. Tube sheet locator and tube expander
US6823937B1 (en) 1998-12-07 2004-11-30 Shell Oil Company Wellhead
US7357188B1 (en) 1998-12-07 2008-04-15 Shell Oil Company Mono-diameter wellbore casing
US7603758B2 (en) 1998-12-07 2009-10-20 Shell Oil Company Method of coupling a tubular member
US7121352B2 (en) 1998-11-16 2006-10-17 Enventure Global Technology Isolation of subterranean zones
US6575240B1 (en) 1998-12-07 2003-06-10 Shell Oil Company System and method for driving pipe
US7231985B2 (en) 1998-11-16 2007-06-19 Shell Oil Company Radial expansion of tubular members
US6634431B2 (en) * 1998-11-16 2003-10-21 Robert Lance Cook Isolation of subterranean zones
US6557640B1 (en) 1998-12-07 2003-05-06 Shell Oil Company Lubrication and self-cleaning system for expansion mandrel
US6745845B2 (en) * 1998-11-16 2004-06-08 Shell Oil Company Isolation of subterranean zones
US6712154B2 (en) * 1998-11-16 2004-03-30 Enventure Global Technology Isolation of subterranean zones
GB2384502B (en) 1998-11-16 2004-10-13 Shell Oil Co Coupling an expandable tubular member to a preexisting structure
US7552776B2 (en) 1998-12-07 2009-06-30 Enventure Global Technology, Llc Anchor hangers
US7195064B2 (en) 1998-12-07 2007-03-27 Enventure Global Technology Mono-diameter wellbore casing
GB2344606B (en) 1998-12-07 2003-08-13 Shell Int Research Forming a wellbore casing by expansion of a tubular member
US7185710B2 (en) 1998-12-07 2007-03-06 Enventure Global Technology Mono-diameter wellbore casing
CA2310878A1 (en) 1998-12-07 2000-12-07 Shell Internationale Research Maatschappij B.V. Lubrication and self-cleaning system for expansion mandrel
US7363984B2 (en) 1998-12-07 2008-04-29 Enventure Global Technology, Llc System for radially expanding a tubular member
US6758278B2 (en) * 1998-12-07 2004-07-06 Shell Oil Company Forming a wellbore casing while simultaneously drilling a wellbore
AU770359B2 (en) 1999-02-26 2004-02-19 Shell Internationale Research Maatschappij B.V. Liner hanger
US7055608B2 (en) 1999-03-11 2006-06-06 Shell Oil Company Forming a wellbore casing while simultaneously drilling a wellbore
CA2306656C (en) 1999-04-26 2006-06-06 Shell Internationale Research Maatschappij B.V. Expandable connector for borehole tubes
US7350563B2 (en) 1999-07-09 2008-04-01 Enventure Global Technology, L.L.C. System for lining a wellbore casing
GB2374622B (en) 1999-11-01 2003-12-10 Shell Oil Co Wellbore casing repair
US7234531B2 (en) 1999-12-03 2007-06-26 Enventure Global Technology, Llc Mono-diameter wellbore casing
US7100684B2 (en) 2000-07-28 2006-09-05 Enventure Global Technology Liner hanger with standoffs
CA2416573A1 (en) 2000-09-18 2002-03-21 Shell Canada Ltd LOST COLUMN SUSPENSION INCLUDING A SLEEVE VALVE
US7100685B2 (en) 2000-10-02 2006-09-05 Enventure Global Technology Mono-diameter wellbore casing
AU2001294802B2 (en) 2000-10-02 2005-12-01 Shell Internationale Research Maatschappij B.V. Method and apparatus for casing expansion
GB2387405A (en) 2001-01-03 2003-10-15 Enventure Global Technology Mono-diameter wellbore casing
US7410000B2 (en) 2001-01-17 2008-08-12 Enventure Global Technology, Llc. Mono-diameter wellbore casing
GB2394979B (en) 2001-07-06 2005-11-02 Eventure Global Technology Liner hanger
US7290616B2 (en) 2001-07-06 2007-11-06 Enventure Global Technology, L.L.C. Liner hanger
US7258168B2 (en) 2001-07-27 2007-08-21 Enventure Global Technology L.L.C. Liner hanger with slip joint sealing members and method of use
US7513313B2 (en) 2002-09-20 2009-04-07 Enventure Global Technology, Llc Bottom plug for forming a mono diameter wellbore casing
WO2004094766A2 (en) 2003-04-17 2004-11-04 Enventure Global Technology Apparatus for radially expanding and plastically deforming a tubular member
GB2396646B (en) 2001-09-07 2006-03-01 Enventure Global Technology Adjustable expansion cone assembly
WO2004081346A2 (en) 2003-03-11 2004-09-23 Enventure Global Technology Apparatus for radially expanding and plastically deforming a tubular member
GB2421257B (en) 2001-11-12 2006-08-16 Enventure Global Technology Mono diameter wellbore casing
CA2471875A1 (en) 2001-12-27 2003-07-17 Enventure Global Technology Seal receptacle using expandable liner hanger
WO2004018824A2 (en) 2002-08-23 2004-03-04 Enventure Global Technology Magnetic impulse applied sleeve method of forming a wellbore casing
US7404444B2 (en) 2002-09-20 2008-07-29 Enventure Global Technology Protective sleeve for expandable tubulars
WO2004018823A2 (en) 2002-08-23 2004-03-04 Enventure Global Technology Interposed joint sealing layer method of forming a wellbore casing
EP1485567B1 (en) 2002-02-15 2008-12-17 Enventure Global Technology Mono-diameter wellbore casing
EP1501644B1 (en) 2002-04-12 2010-11-10 Enventure Global Technology Protective sleeve for threaded connections for expandable liner hanger
EP1501645A4 (en) 2002-04-15 2006-04-26 Enventure Global Technology PROTECTIVE SLEEVE FOR THE THREADED CONNECTIONS OF A EXPANSIBLE LOST EXPANSIBLE TUBING COLLAR SUSPENSION DEVICE
WO2003102365A1 (en) 2002-05-29 2003-12-11 Eventure Global Technology System for radially expanding a tubular member
GB2418943B (en) 2002-06-10 2006-09-06 Enventure Global Technology Mono Diameter Wellbore Casing
MXPA05003115A (es) 2002-09-20 2005-08-03 Eventure Global Technology Evaluacion de formabilidad de un tubo para miembros tubulares expandibles.
CA2499071C (en) 2002-09-20 2014-06-03 Enventure Global Technology Self-lubricating expansion mandrel for expandable tubular
US7886831B2 (en) 2003-01-22 2011-02-15 Enventure Global Technology, L.L.C. Apparatus for radially expanding and plastically deforming a tubular member
GB2433281B (en) 2003-01-27 2007-08-01 Enventure Global Technology Lubrication system for radially expanding tubular members
GB2415983B (en) 2003-02-26 2007-09-05 Enventure Global Technology Apparatus for radially expanding and plastically deforming a tubular member
US20050166387A1 (en) 2003-06-13 2005-08-04 Cook Robert L. Method and apparatus for forming a mono-diameter wellbore casing
US7712522B2 (en) 2003-09-05 2010-05-11 Enventure Global Technology, Llc Expansion cone and system
WO2006020960A2 (en) 2004-08-13 2006-02-23 Enventure Global Technology, Llc Expandable tubular
US8231804B2 (en) * 2008-12-10 2012-07-31 Syntroleum Corporation Even carbon number paraffin composition and method of manufacturing same
US9035115B2 (en) * 2011-12-09 2015-05-19 Chevron U.S.A. Inc. Hydroconversion of renewable feedstocks
JP2014042920A (ja) * 2012-08-24 2014-03-13 Mitsubishi Heavy Ind Ltd 拡管治具、伝熱管の拡管方法、補修方法及び閉塞方法
CN104117816A (zh) * 2013-04-28 2014-10-29 宝山钢铁股份有限公司 一种组合式的钻杆加工方法
CN114393386B (zh) * 2022-01-25 2022-08-05 山东欣盛信息科技有限公司 一种地热能发电机组的装配设备

Family Cites Families (23)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3962767A (en) * 1974-08-13 1976-06-15 Westinghouse Electric Corporation Method for repairing a heat exchanger tube
US4069573A (en) * 1976-03-26 1978-01-24 Combustion Engineering, Inc. Method of securing a sleeve within a tube
US4262402A (en) * 1978-10-18 1981-04-21 Westinghouse Electric Corp. Method for servicing a steam generator
US4329769A (en) * 1979-12-05 1982-05-18 Westinghouse Electric Corp. Apparatus for working on tubesheets
US4573248A (en) * 1981-06-04 1986-03-04 Hackett Steven B Method and means for in situ repair of heat exchanger tubes in nuclear installations or the like
DE3122660C2 (de) * 1981-06-06 1986-06-19 Brown Boveri Reaktor GmbH, 6800 Mannheim Einrichtung zur Inspektion und/oder zur Reparatur der Rohre eines Dampferzeugers einer Kernkraftanlage
US4641409A (en) * 1982-09-23 1987-02-10 Westinghouse Electric Corp. Reconstituting a nuclear reactor fuel assembly
US4485847A (en) * 1983-03-21 1984-12-04 Combustion Engineering, Inc. Compression sleeve tube repair
GB8317997D0 (en) * 1983-07-01 1983-08-03 Nat Nuclear Corp Ltd Heat exchange tube repairs
US4571821A (en) * 1983-08-26 1986-02-25 Westinghouse Electric Corp. Sleeve insertion
US4586250A (en) * 1983-10-03 1986-05-06 Westinghouse Electric Corp. Apparatus for sleeving tubes in hostile environments
US4639994A (en) * 1983-10-03 1987-02-03 Westinghouse Electric Corp. Suspension of tools for sleeving of tubes of steam generator
US4688327A (en) * 1983-10-03 1987-08-25 Westinghouse Electric Corp. Sleeving of tubes of steam generator
EP0137984A3 (en) * 1983-10-14 1986-02-05 Lummus Crest S.A.R.L. Tube repair insert for steam generator
US4653164A (en) * 1984-02-14 1987-03-31 Westinghouse Electric Corp. Sleeving of tubes of steam generator in hostile environment
US4580426A (en) * 1984-02-27 1986-04-08 Westinghouse Electric Corp. Hybrid expansion apparatus and process
US4547944A (en) * 1984-03-02 1985-10-22 National Nuclear Corporation Limited Tube-in-shell heat exchangers
BE899632A (nl) * 1984-05-11 1984-11-12 Ebes Ver Energie Schelde Werkwijze om pijpen van een stoomgenerator te herstellen.
US4713870A (en) * 1985-03-26 1987-12-22 Raychem Corporation Pipe repair sleeve apparatus and method of repairing a damaged pipe
FR2598209B1 (fr) * 1986-04-30 1988-08-12 Framatome Sa Procede et dispositif de chemisage a distance d'un tube de generateur de vapeur d'un reacteur nucleaire a eau sous pression.
FR2598211B1 (fr) * 1986-04-30 1988-08-12 Framatome Sa Dispositif d'alimentation a distance en pieces de forme cylindrique d'une machine automatique telle qu'une machine de bouchage de tubes d'un generateur de vapeur d'un reacteur nucleaire a eau sous pression
US4716753A (en) * 1986-07-10 1988-01-05 Dresser Industries, Inc. Flexible tube expander extension assembly
US4829648A (en) * 1987-01-27 1989-05-16 Westinghouse Electric Corp. Apparatus and method for simultaneously loading a reinforcing sleeve and mandrel into a tube

Also Published As

Publication number Publication date
FR2598202B1 (fr) 1990-02-09
CA1287483C (en) 1991-08-13
US4827594A (en) 1989-05-09
JPS62263833A (ja) 1987-11-16
DE3765455D1 (de) 1990-11-15
EP0245134B1 (fr) 1990-10-10
US4922605A (en) 1990-05-08
FR2598202A1 (fr) 1987-11-06
ZA872789B (en) 1988-03-30
EP0245134A1 (fr) 1987-11-11
US4976027A (en) 1990-12-11

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