EP1084005A1 - Procede permettant de cintrer un tuyau double et, notamment, un tuyau bimetallique - Google Patents

Procede permettant de cintrer un tuyau double et, notamment, un tuyau bimetallique

Info

Publication number
EP1084005A1
EP1084005A1 EP99924597A EP99924597A EP1084005A1 EP 1084005 A1 EP1084005 A1 EP 1084005A1 EP 99924597 A EP99924597 A EP 99924597A EP 99924597 A EP99924597 A EP 99924597A EP 1084005 A1 EP1084005 A1 EP 1084005A1
Authority
EP
European Patent Office
Prior art keywords
pipe
bending
double
inner pipe
bending tool
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
EP99924597A
Other languages
German (de)
English (en)
Inventor
Emiel Cherrette
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.)
Fabricom SA
Original Assignee
Fabricom 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 Fabricom SA filed Critical Fabricom SA
Publication of EP1084005A1 publication Critical patent/EP1084005A1/fr
Ceased legal-status Critical Current

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D9/00—Bending tubes using mandrels or the like
    • B21D9/16—Auxiliary equipment, e.g. machines for filling tubes with sand
    • B21D9/18—Auxiliary equipment, e.g. machines for filling tubes with sand for heating or cooling of bends
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D26/00—Shaping without cutting otherwise than using rigid devices or tools or yieldable or resilient pads, i.e. applying fluid pressure or magnetic forces
    • B21D26/02—Shaping without cutting otherwise than using rigid devices or tools or yieldable or resilient pads, i.e. applying fluid pressure or magnetic forces by applying fluid pressure
    • B21D26/033—Deforming tubular bodies
    • B21D26/051—Deforming double-walled bodies
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D9/00—Bending tubes using mandrels or the like
    • B21D9/15—Bending tubes using mandrels or the like using filling material of indefinite shape, e.g. sand, plastic material

Definitions

  • the present invention relates to a method for forming at least one bend in a double pipe comprising an inner pipe located within an outer pipe.
  • US 4,377,894 discloses a method wherein a double pipe is bent using a suitable bending tool.
  • the outer surface of the outer pipe is heated and/or the inner surface of the inner pipe is cooled.
  • an expanding force in particular a hydraulic pressure, is applied to the interior of the inner tube.
  • the temperature of the outer pipe is caused to be lower than that of the inner pipe, in order to produce a tight fit between the outer pipe and the inner pipe.
  • This technique is known as thermo- hydraulic technique.
  • a problem with this known technique is that it is relatively cumbersome and expensive to implement.
  • a further problem is that upon bending the double pipe, the inner pipe loses contact from the outer pipe at the outer side of the bend (extrados). In addition, buckling occurs in the inner pipe at the inner side of the bend (intrados).
  • Buckling occurs at the inner side of the curve due to the fact that the inner pipe has a limited thickness, typically about 3 mm.
  • the problem of loosening occurs due to the fact that the materials used for manufacturing the inner and outer pipes have a different coefficient of expansion.
  • the outer pipe is made of carbon-steel and the inner pipe of stainless-steel
  • the coefficient of expansion of stainless steel is larger than the coefficient of expansion of carbon-steel
  • the average coefficient of linear expansion for carbon steel is approximately 14 * 10 "6 /°C and for stainless steel approximately 18*10 "6 /°C
  • the stainless-steel inner pipe will therefore shrink more than the carbon-steel outer pipe As a result, the inner pipe is loosened from the outer pipe
  • An object of the present invention is to provide an alternative method for forming a bend in a double pipe achieving satisfactory results, which is less cumbersome and less expensive to implement, and wherein the buckling problem is reduced
  • a method for forming at least one bend in a double pipe comprising an inner pipe located within an outer pipe, wherein the inner pipe has a coefficient of expansion higher than the coefficient of expansion of the outer pipe
  • the method is applied on an outer pipe having a yield point higher than the yield point of the inner pipe
  • the method essentially comprises the following steps In a first step, the inner pipe is filled with a compressible material The compressible material is compressed in the inner pipe This first step allows to reduce buckling and loosening of the inner pipe upon bending In a second step, the double pipe is bent using a pipe bending tool Then, the filling material is removed from the inner pipe In a further step, an expanding force is applied to the inner pipe until the outer pipe has undergone a predetermined expansion
  • the compressible material is in particular a granular material, such as sand Use of sand for reducing buckling upon bending single pipes is known, as indicated for example in EP-A-0 099 714.
  • filling sand has only been applied for bending single pipes.
  • the invention is related to a method for bending double pipes. It has been discovered that the use of the compressible material, in particular sand, reduces buckling of the inner pipe at the inner side of the bend, but also reduces loosening of the inner pipe from the outer pipe at the outer side of the bend. Furthermore, the subsequent steps of applying a heat source to the outer pipe and/or a cooling source to the inner pipe is no longer required. It is sufficient to apply an expanding force for achieving satisfactory results. Consequently, the method according to the invention is less expensive to apply than the known thermo-hydraulic method.
  • Figure 1 is a section view of a portion of a double pipe before bending.
  • Figure 2 is a section view of a portion of the double pipe of Figure 1 after bending using conventional techniques without filling with a compressible material.
  • Figure 3 illustrates the double pipe of Figure 1 after bending using the method according to the invention, but before the step of applying an expanding force.
  • Figure 4 is a diagram illustrating the direction of movement and the speed of the bending tool and the double pipe in function of the time during the bending operation.
  • Figure 5 is a section view of the pipe of Figure 3 showing the extension piece wherein an opening is provided.
  • Figure 6 is a section view of the double pipe of Figure 1 after the expanding force has been applied.
  • the method for forming at least one bend according to the invention is applicable on double pipes or so called bimetallic pipes.
  • a corrosion resisting inner pipe 10 is telescopically aligned inside a carbon outer pipe 12 and expanded by an expansion and calibrating process known as such.
  • An example of such a pipe is manufactured by Butting under the trade name BUBI pipe.
  • the outer pipe is provided for ensuring strength, while the inner pipe is provided for ensuring protection against corrosion.
  • the inner pipe is made of stainless-steel and the outer pipe of carbon-steel.
  • the inner pipe 10 Before bending such a double pipe, the inner pipe 10 is filled with a compressible material 11 , which could for example be a granular material, in particular sand.
  • the compressible material should be a non metal and resisting to relatively high temperatures.
  • the compressible material is compressed in the inner tube using a technique known as such for single pipes.
  • the compressible material is removed.
  • the obtained pipe bend is shaped as illustrated in Figure 3.
  • an appropriate bending tool use is made of an appropriate bending tool.
  • a hot bending technique is applied using a heating mechanism, such as an inductor.
  • the temperature of the inner tube is essentially equal to the temperature of the outer pipe.
  • FIG. 4 is a diagram illustrating the direction of movement, the speed of the bending tool Vj and the speed of the double pipe v p in function of the time t upon bending the double pipe. The bending operation is performed from time span ti to t 6 .
  • a preheat phase (from ti to t 2 ), a start bending phase (from t 2 to t 3 ), a bending phase (from t 3 to t 4 ), an end bending phase (from t 4 to t 5 ) and a post heating phase (from t to t 6 ) are distinguished.
  • the inductor In the preheat phase, the inductor is moved in a first direction with a speed Vj, which is constant between time ti and t 2 . In the start bending phase, the inductor speed vi progressively decreases. Between time t 2 and t 3 , the double pipe is also moved in a second direction, opposite to the first direction, as illustrated in the lower part of Figure 4, with a progressively increasing speed v p .
  • the end phase comprising the end bending phase and the postheating phase
  • the inverse operation of the start phase is performed.
  • the double pipe speed v p is progressively decreasing between time t 4 and t 5
  • the inductor speed V ⁇ is progressively increasing.
  • the inductor is moved with a constant speed v* while the double pipe is not moved.
  • start and end phases allow to form a smooth transition between the straight part of the double pipe and the bend.
  • local buckling at these transitions is considerably reduced and the compression of the sand is improved, due to the effect of shrinking.
  • the relative speed between the inductor and the double pipe is kept essentially constant during the bending operation, as illustrated in Figure 4.
  • the sum of the speeds v ⁇ and v p is constant.
  • the duration of the initial phase, the intermediate phase and the end phase, as well as values for the speed will depend on a number of parameters, such as the material used for the inner and outer pipes, the diameter, the thickness.
  • the speed is approximately 50 mm/min, time span t 2 - ti approximately 30 seconds, time span t 3 - 1 2 approximately 45 seconds, time span t 4 - t 3 approximately 35 minutes, time span t 5 - t 4 approximately 45 seconds and time span t 6 - t 5 approximately 30 seconds.
  • the hydraulic pressure is in order of 47.5 MPa.
  • the expanding force is applied until the outer pipe has undergone a predetermined expansion.
  • the inner pipe will first be subjected to an elastic deformation and then a plastic deformation. After a determined degree of expansion, the inner pipe is in contact with the outer pipe. Keeping the expanding force will lead to a further plastic expansion of the inner pipe together with an elastic expansion and subsequently a plastic expansion of the outer pipe. Both pipes are thus plastically expanded.
  • This step of applying an expanding force is required, since a space is formed between the inner pipe and the outer pipe, as shown in Figures 3 and 5.
  • the space is present due to the heating applied upon bending the pipes and due to the different expansion coefficients of the inner and outer pipes. It should be noted that the space between the inner and outer pipes is considerably smaller than a corresponding space when applying the conventional techniques, wherein the bend is formed without using a compressible material.
  • An opening 15 is preferably provided for allowing air, present in the space, to escape when the expanding force is applied.
  • the opening is preferably provided in an extension part 16 of the double pipe, which extension part will be cut when the bending operation has been completed. The expanding force is released when a predetermined degree of expansion of one of the pipes, in particular the outer pipe, has been reached.
  • the expanding force has been released when the outer diameter of the outer pipe has expanded of 1 % of the outside diameter. If the yield point of the outer tube is larger than the yield point of the inner tube, the outer pipe will tend to shrink more than the inner pipe. This ensures a tight fitting between the inner and outer pipes.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Bending Of Plates, Rods, And Pipes (AREA)
  • Branch Pipes, Bends, And The Like (AREA)

Abstract

Cette invention concerne un procédé qui permet de former au moins une courbure dans un tuyau double, lequel tuyau comprend un tuyau interne disposé à l'intérieur d'un tuyau externe. Ce procédé comprend essentiellement les étapes suivantes. Au cours d'une première étape, le tuyau interne (10) est rempli d'un matériau compressible (11), et le matériau compressible (11) est comprimé à l'intérieur dudit tuyau interne. Au cours d'une deuxième étape, le tuyau double est cintré à l'aide d'un outil de cintrage de tuyau, et le matériau de remplissage (11) est retiré du tube interne. Au cours d'une autre étape encore, une force d'expansion est appliquée sur le tuyau interne (10) jusqu'à ce que le tuyau externe (12) ait atteint une expansion prédéterminée.
EP99924597A 1998-06-05 1999-06-04 Procede permettant de cintrer un tuyau double et, notamment, un tuyau bimetallique Ceased EP1084005A1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
BE9800434 1998-06-05
BE9800434A BE1012024A3 (fr) 1998-06-05 1998-06-05 Procede de cintrage par induction d'un double tube.
PCT/BE1999/000070 WO1999064180A1 (fr) 1998-06-05 1999-06-04 Procede permettant de cintrer un tuyau double et, notamment, un tuyau bimetallique

Publications (1)

Publication Number Publication Date
EP1084005A1 true EP1084005A1 (fr) 2001-03-21

Family

ID=3891289

Family Applications (1)

Application Number Title Priority Date Filing Date
EP99924597A Ceased EP1084005A1 (fr) 1998-06-05 1999-06-04 Procede permettant de cintrer un tuyau double et, notamment, un tuyau bimetallique

Country Status (4)

Country Link
EP (1) EP1084005A1 (fr)
AU (1) AU4124799A (fr)
BE (1) BE1012024A3 (fr)
WO (1) WO1999064180A1 (fr)

Families Citing this family (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2413976A (en) * 2004-05-14 2005-11-16 Fmc Technologies Manufacture of pipes
RS964U (sr) * 2007-12-04 2008-08-07 Uroš Turanjanin Mašina za savijanje aluminijumskih i pvc profila
EP2327486B1 (fr) 2009-11-26 2012-05-23 DALMINE S.p.A. Procédé de fabrication de coude de tuyau en ligne
GB2511773B (en) 2013-03-12 2015-09-09 Acergy France SAS Pipe bending for reel-lay operations
US9310023B2 (en) 2013-06-20 2016-04-12 The Boeing Company Methods and systems for distributing inert gas in an aircraft
GB2579417B (en) 2018-11-30 2021-06-02 Subsea 7 Do Brasil Servicos Ltda Pipe spooling for reel-lay operations
CN110181228B (zh) * 2019-05-17 2021-02-02 东莞材料基因高等理工研究院 一种双金属机械复合弯管的制造工艺
CN111633392B (zh) * 2020-07-17 2023-12-29 常州今创风挡***有限公司 一种连接框制作工艺

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2220910A1 (de) * 1972-04-28 1973-12-20 Babcock & Wilcox Ag Verfahren und vorrichtung zur herstellung von boegen aus rohren oder hohlkoerpern im warmbiegeverfahren
DE2329113A1 (de) * 1973-06-07 1975-01-02 Babcock & Wilcox Ag Vorrichtung zur herstellung von boegen aus rohren oder hohlkoerpern im warmbiegeverfahren
CA1139923A (fr) * 1979-02-28 1983-01-25 Toshio Yoshida Methode de production de canalisations composites multiparoi
JPS5645220A (en) * 1979-09-21 1981-04-24 Dai Ichi High Frequency Co Ltd Bending method for metallic pipe
US4377894A (en) * 1980-03-21 1983-03-29 Kawasaki Jukogyo Kabushiki Kaisha Method of lining inner wall surfaces of hollow articles
DE3366080D1 (en) * 1982-07-14 1986-10-16 British Petroleum Co Plc Method for bending pipes
JP2609205B2 (ja) * 1992-10-12 1997-05-14 本田技研工業株式会社 金属管の曲げ加工方法

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO9964180A1 *

Also Published As

Publication number Publication date
WO1999064180A1 (fr) 1999-12-16
BE1012024A3 (fr) 2000-04-04
AU4124799A (en) 1999-12-30

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