WO2014169365A2 - Tuyau à couches multiples - Google Patents

Tuyau à couches multiples Download PDF

Info

Publication number
WO2014169365A2
WO2014169365A2 PCT/BR2014/000248 BR2014000248W WO2014169365A2 WO 2014169365 A2 WO2014169365 A2 WO 2014169365A2 BR 2014000248 W BR2014000248 W BR 2014000248W WO 2014169365 A2 WO2014169365 A2 WO 2014169365A2
Authority
WO
WIPO (PCT)
Prior art keywords
tube
base
multilayer pipe
inner coating
base tube
Prior art date
Application number
PCT/BR2014/000248
Other languages
English (en)
Other versions
WO2014169365A3 (fr
Inventor
Júlio Márcio SILVEIRA E SILVA
Timo EBELING
Hezick DA SILVA PERDIGÃO
Danielle GRANHA GIORGINI
Original Assignee
Vallourec Tubos Do Brasil S.A.
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 Vallourec Tubos Do Brasil S.A. filed Critical Vallourec Tubos Do Brasil S.A.
Publication of WO2014169365A2 publication Critical patent/WO2014169365A2/fr
Publication of WO2014169365A3 publication Critical patent/WO2014169365A3/fr

Links

Classifications

    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16LPIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
    • F16L9/00Rigid pipes
    • F16L9/02Rigid pipes of metal
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16LPIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
    • F16L58/00Protection of pipes or pipe fittings against corrosion or incrustation
    • F16L58/02Protection of pipes or pipe fittings against corrosion or incrustation by means of internal or external coatings
    • F16L58/04Coatings characterised by the materials used
    • F16L58/08Coatings characterised by the materials used by metal
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B21MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21CMANUFACTURE OF METAL SHEETS, WIRE, RODS, TUBES OR PROFILES, OTHERWISE THAN BY ROLLING; AUXILIARY OPERATIONS USED IN CONNECTION WITH METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL
    • B21C37/00Manufacture of metal sheets, bars, wire, tubes or like semi-manufactured products, not otherwise provided for; Manufacture of tubes of special shape
    • B21C37/06Manufacture of metal sheets, bars, wire, tubes or like semi-manufactured products, not otherwise provided for; Manufacture of tubes of special shape of tubes or metal hoses; Combined procedures for making tubes, e.g. for making multi-wall tubes
    • B21C37/15Making tubes of special shape; Making tube fittings
    • B21C37/154Making multi-wall tubes

Definitions

  • the present invention relates to a steel pipe with multiple layers, which are metallurgical ⁇ bonded to a base tube and/or an adjacent layer.
  • Multilayer pipes such as pipes having a metallurgical clad (also known as “clad pipes”) and pipes having a mechanical clad (also known as “lined pipes”) are widely used in the oil industry, in heat exchangers, reactors and sections of exhaust flue gas.
  • clad pipes metallurgical clad
  • lined pipes mechanical clad
  • coating means a lining material that will be clad through a hot forming process.
  • a clad pipe consists of a set of tubes bond together metallurgically, and may include materials such as C-steel, CRA (corrosion-resistant alloys), WRA (abrasion-resistant alloys), amongst others.
  • Document EP2275199A2 discloses a method of making a cylindrical clad tube from a first tube of corrosion-resistant alloy, comprising a zirconium alloy and a second tube with high mechanical strength comprising a titanium alloy.
  • This tube is used in equipment subject to corrosive environments, for exam- pie, equipment for the synthesis of ammonia.
  • the cylindrical clad tube of this process exhibits a metallurgical bond between its constituent tubes, this bond being obtained by hot co-extrusion, with the tubes being heated to a temperature between 550°C and 900°C.
  • Document US5620805A discloses a multilayer tube possessing material that is highly resistant to hot corrosion and hot erosion in its outer or inner layer.
  • the corrosion-resistant alloy contains the alloy elements silicon, manganese, chromium, nickel, molybdenum, niobium and aluminum. This tube is used in heaters where fuel is burned.
  • Document CN102039326A discloses a bimetallic pipe used in a recovery boiler for combustion of alkaline waste liquor.
  • the bimetallic tube is produced by an extrusion process and has a corrosion-resistant outer layer that comes into contact with the alkaline waste liquor while the inner layer provides mechanical strength to the high pressure of the boiler.
  • Document CN102506236A discloses a fatigue- and impact-resistant bimetal- lie tube produced from an outer tube of steel with high carbon content and an inner tube of steel with a low carbon content. The two tubes are welded or glued together and then subjected to a series of steps of mechanical forming, including hot co-drawing, cold co-drawing, rolling, rotating extrusion and drawing, among others, the mechanical forming processes followed by heat treatment.
  • a multilayer pipe comprising a base tube of metallic material and at least one outer coating tube of metallic material disposed coaxially and externally in relation to the base tube, wherein the base tube and the at least one coating tube are mechanically bonded together with an interference fit, and metallurgically bond- ed together in at least one portion of the length of the base tube and the outer coating tube.
  • the multilayer pipe may further comprise at least one inner coating tube co- axially disposed internally to the base tube, mechanically bonded with an in- terference fit, and metallurgically bonded to the base tube in at least one portion of the length of the base tube and the coating tube.
  • Mechanical bond with interference fit between the base tube and the at least one coating tube is preferably obtained from cold mechanical forming of the base tube together with the at least one outer and/or inner coating tube and the metallurgical bond between the base tube and the at least one outer and/or inner coating tube is preferably obtained by hot mechanical forming of the base tube together with the at least one outer and/or inner coating tube.
  • the metallurgical bond between the base tube and the at least one coating tube is preferably obtained after the mechanical bond between said tubes.
  • the base tube and at least one coating tube may be metallurgically bonded along the entire length of the tubes and they may be seamless tubes, and the multilayer pipe has a homogeneous distribution of material along its longitudinal length.
  • the multilayer pipe may comprise an intermediate layer of metallic material disposed between the base tube and at least one outer and/or inner coating tube.
  • the metallic material of the intermediate layer may have a melting point lower than the melting point of the base tube and of the coating tube(s).
  • the intermediate layer comprises nickel (Ni) or zirconium (Zn).
  • the base tube alternatively, has high mechanical strength and may be composed of a car- bon manganese steel alloy.
  • the at least one outer and/or inner coating tube may be made of a corrosion- resistant metal alloy, an abrasion-resistant metal alloy and/or a fatigue- resistant metal alloy. These coating tubes may be made of a material comprising at least one of carbon steel, low alloy steel, high alloy steel, stainless steel, Nickel base alloy, Titanium base alloy, Cobalt base alloy, Copper base alloy, Tin base alloy, Zirconium base alloy, and Chromium, Cobalt and Tungsten steel.
  • the multilayer pipe may comprise at least one additional coating tube coaxi- ally disposed relative to the base tube and to at least one coating tube, with a surface of the additional tube being mechanically bonded with an interference fit to the coating tube adjacent to said additional tube.
  • the additional coating tube may also be metallurgically bonded in at least one portion of its length to the surface of the coating tube adjacent to said additional tube.
  • the additional coating tube may be directly metallurgically bonded in at least one portion of its length to the surface of the coating tube adjacent to said additional tube.
  • Figure 1 - a schematic view of a first embodiment of the multilayer pipe of the invention with an outer coating layer.
  • Figure 2 - a schematic view of a second embodiment of the multilayer pipe of the invention with an outer coating layer and an inner coating layer.
  • the invention relates to a multilayer coated tube comprising a base tube 10 of metallic material, which is responsible for conferring mechan- ical strength to the multilayer pipe, and at least one outer coating tube 30 also of metallic material coaxially disposed externally in relation to the base tube, to coat the base tube 10.
  • the base tube 10 and the at least one outer coating tube 30 are mechanically bonded together with an interference fit, and metallurgically bonded, and this metallurgical bond between the tubes may be along the entire length thereof or only in certain portions of the Interface between them.
  • the multilayer pipe 1 may comprise more than one coating tube, wherein one outer coating tube 30 is disposed externally to the base tube 10 and another inner coating tube 20 being disposed internally to the base tube 10, both coating tubes 20, 30 being mechanically bonded to the base tube, with an interference fit, and metallurgically bonded along its entire length, or only part of it, so that the multilayered pipe 1 is provided with inner and outer coating.
  • the multilayer pipe 1 may have a plural- ity of outer and inner coating tubes coaxially disposed in relation to the base tube, each coating tube being mechanically bonded with an interference fit, and metallurgically bonded at least in parts of the interface, to the adjacent coating tube.
  • Figure 1 depicts a first embodiment of the multilayer pipe 1 of the present invention, comprising a base tube 10 and only one outer coating tube 30.
  • the coating tube 30 is disposed coaxially in relation to the base tube 10 so that the inner surface of the outer coating tube 30 is interfaced directly with the outer surface of the base tube 10.
  • the base tube 10 has a metallurgical bond with the tube 30 that meets the minimum requirements of norms ASTM A578 and API 5LD
  • the multilayer pipel is commonly termed clad pipe. That is, any non-clad area on the surface of the pipe may not exceed a diameter of 25mm inside a scanned area of a 225 by 225mm square centered on an indication of a discontinuity.
  • the pipe should not have any non-clad area within a distance of 100mm from the pipe ends.
  • the multilayer pipe may be manufactured with up to 100% cladding between the base tube 10 and the outer coating tube 30.
  • multilayer pipes in which there is metallurgical bond only in parts of the interface (cladding in parts) between the base tube 10 and the coating tube(s) 30.
  • the metallurgical bond between the tubes is given, for example, in helicoidal lines along the tubes, among others.
  • the multilayer pipe has a base tube 10, an outer coating tube 30 and an inner coating tube 20.
  • the metallurgical bond between the base tube 10 and the either outer 30 or inner 20 coating tube(s), is obtained after the mechanical bond between said tubes.
  • a good mechanical bond between the tubes 20, 10, 30 that constitute the multilayer pipe 1 contributes to improving the quality of the metallurgical bond between these tubes, since the mechanical bond ensures that there are no spaces between the tubes during cladding (formation of metallurgical bond).
  • the existence of a space between the pipes would result in a non- bonded section of the final multilayer pipe.
  • This interstice between the tubes typically contains atmospheric air, which causes oxidation of the constituent metals of the tube, weakening the multilayer pipe 1. This oxidation is exacerbated by the high temperature of the cladding process, usually above 900°C.
  • the mechanical bond with interference fit between the base tube 10 and the outer coating tube, and, if applicable, also the inner coating tube 20, is achieved through a mechanical cold- forming process of the base tube 10 together with the coating tube(s) 20, 30.
  • the base tube 10 and the coating tubes 20, 30 are arranged coaxially.
  • the base tube 10 is disposed within the outer coating tube 30 and, where appropriate, an inner coating tube 20 is disposed inside the base tube 10. Then, these tubes are simultaneously submitted to a forming process, such as expansion, drawing, among others.
  • this multilayer pipe 1 is commonly called lined pipe (or mechanically clad pipes).
  • the base tube 10 presses the outer coating tube 30 radially outward and vice versa, providing a contact force between the tubes and, consequently, a mechanical bond between them, forming a lined pipe.
  • the outer tube of the multilayer pipe (outer coating tube 30) has a greater elastic return than the elastic return of the pipe disposed inside it (the base tube 10) when both are deformed, and so forth.
  • the tubes must have a combination of mechanical properties suitable for the formation a mechanical bond between them. In the case of a mechanical bond obtained by expansion, for example, it is desired that the outer tube has a yield strength greater than the yield strength of the tube disposed inside it.
  • the metallurgical bond between the base tube 10 and the coating tube(s) 20, 30 is preferably achieved by hot mechanical forming of the base tube 10 together with the coating tube(s) 20, 30.
  • the lined pipe 1 is then subjected to a hot forming process, such as expansion, drawing, forging, among others.
  • a hot forming process such as expansion, drawing, forging, among others.
  • the cold forming and hot forming are performed sequentially on the same production line, and heating for hot forming is done by using electromagnetic induction, for example, with the aid of electromagnetic coils at the beginning of the hot forming step.
  • the coating tube(s) 20 and/or 30 and the base tube 10 are seamless tubes, which ensures a better uniformity of distribution of material along the entire length of the tube.
  • the base tube may be a seamless tube, and the tube may be a seam welded tube.
  • the multilayer pipe 1 provides a homogeneous distribution of material along its longitudinal length, which also ensures uniformity of the mechanical properties and of the material along its longitudinal length.
  • the weld fillets either longitudinal seams or beads deposited on the end of the tube to prevent the entry of air between its layers, generate discontinuity in the material of the tube, which causes stress concentrations that are harmful to the mechanical strength of the multilayer pipe.
  • the base tube 10 should have high mechanical strength, therefore, consisting of selected material to resist mechanical stresses to which the multilayer pipe is subjected.
  • the base tube 10 is preferably made of a carbon manganese steel alloy, but it is not restricted, however, to this material.
  • the coating tubes 20, 30 have the function of providing the multilayer pipe the desired function, for example, from among resistance to fatigue, abra- sion, erosion, and corrosive environments, among others.
  • the inner coating tube 20 should provide corrosion resistance to the multilayer pipe 1 in order to protect it from the fluid transported inside it, which tends to promote chemical attack to the pipe.
  • the outer coating tube 30 also provides corrosion protection.
  • the outer coating tube 30 and/or inner coating tube 20 are formed based on a corrosion-resistant metal alloy.
  • the primary function of the outer coating tube 30 is to provide high re- sistance to high mechanical stresses, in which case the coating tube will consist of fatigue-resistant and/or abrasion-resistant metal alloy.
  • the fatigue- resistant and/or abrasion-resistant metal alloy can also be used in the formation of the inner coating tube 20 depending on the need of applying the multilayer pipe 1 .
  • a multilayer pipe may comprise an outer coating tube 30 made of abrasion-resistant material, a base tube 10 made of carbon steel and an inner coating tube 20 made of corrosion-resistant alloy.
  • the coating tube(s) 20, 30 are preferably made of a material comprising at least one of carbon steel, low alloy steel, high alloy steel, stainless steel, Nickel base alloy, Titanium base alloy, Cobalt base alloy, Copper base alloy, Tin base alloy, Zirconium base alloy, and Chromium, Cobalt and Tungsten steel, Inconel® or any corrosion-, abrasion- and/or fatigue-resistant material.
  • an intermediate layer of metallic material is disposed between the base tube 10 and the inner coating tube 20 and/or outer coating tube 30.
  • the intermediate layer of metallic material may have a melting point lower than the melting points of the base tube 10 and coating tube(s) 30, 20; however, it is not a component necessary to ensure the metallurgical bond between the tubes.
  • the intermediate layer may consist of nickel (Ni), zirconium (Zn) or other metals or metal alloys. The application of the intermediate layer of material must be done before the mechanical bond and the metallurgical bond be- tween the tubes.
  • the intermediate layer of metallic material must also be formed of a material that has affinity with the metallic materials of the base tube 10 and coating tube 20, 30 in order to avoid the formation of deleterious phases that consequently may weaken the interface between materials.
  • the application of an intermediate layer of the material may be through painting, galvanizing, electroplating, not limited to these application forms.
  • the total deformation values of the final pipe when compared to the initially assembled tubes before the manufacturing process are the following:
  • the present invention provides a multilayer pipe clad that is externally cladded, if necessary, also internally cladded.
  • the multilayer pipe according to the invention also differs from the multilayer pipes belonging to the state of the art because it is obtained from a plurality of tubes mounted together, which have, prior to the metallurgical bond, only a mechanical bond between their constituent tubes, so as to ensure continuous and homogeneous properties throughout their longitudinal length. Furthermore, this advantage is obtained through the use of inputs simpler than those reported in the prior art, and the multilayer pipe is ob- tained from mechanically bonded pipes only by a residual mechanical stress, free of additional bonding elements such as adhesives and welds.
  • the coated multilayer pipe of the present invention is economically advantageous because it uses a combination of materials that enable the reduction of costs in relation to the tubes belonging to the prior art of similar dimen- sions and made of similar materials.
  • the costs of the multilayer tube of the present invention, comprising an abrasion-resistant layer, a core and a corrosion-resistant layer are also substantially lower than those of a pipe made of a material that has all these properties, which would be extremely complex and expensive.
  • the multilayer pipe because of its homogeneous distribution of material, prevents service stress concentration, increasing the useful life of the product.

Landscapes

  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Rigid Pipes And Flexible Pipes (AREA)
  • Pressure Welding/Diffusion-Bonding (AREA)
  • Laminated Bodies (AREA)

Abstract

La présente invention se rapporte à un tuyau (1) à couches multiples comprenant un tube de base (10) de matériau métallique et au moins un tube de revêtement extérieur (30) de matériau métallique disposé de manière coaxiale et extérieure par rapport au tube de base, et le tube de base (10) et le ou les tubes de revêtement extérieurs (30) sont mécaniquement liés ensemble par ajustement par serrage. Le tuyau à couches multiples est un tube qui présente une répartition homogène de matériau sur sa longueur longitudinale.
PCT/BR2014/000248 2013-08-23 2014-07-23 Tuyau à couches multiples WO2014169365A2 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
BR102013021662A BR102013021662A2 (pt) 2013-08-23 2013-08-23 Tubo multicamadas revestido
BRBR1020130216623 2013-08-23

Publications (2)

Publication Number Publication Date
WO2014169365A2 true WO2014169365A2 (fr) 2014-10-23
WO2014169365A3 WO2014169365A3 (fr) 2014-12-24

Family

ID=51292749

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/BR2014/000248 WO2014169365A2 (fr) 2013-08-23 2014-07-23 Tuyau à couches multiples

Country Status (3)

Country Link
AR (1) AR097428A1 (fr)
BR (1) BR102013021662A2 (fr)
WO (1) WO2014169365A2 (fr)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106545718A (zh) * 2017-01-22 2017-03-29 江苏顺通管业有限公司 一种高性能有缝三通
EP3181250A1 (fr) * 2015-12-15 2017-06-21 GFM - GmbH Procédé de fabrication de pièces métalliques creuses
WO2018009633A1 (fr) * 2016-07-07 2018-01-11 Bull Moose Tube Company Structures métalliques revêtues d'acier et leurs procédés de fabrication
WO2018196622A1 (fr) * 2017-04-28 2018-11-01 杰森能源技术有限公司 Tube spiralé en acier composite à haute performance, résistant à la corrosion et économique et son procédé de fabrication
CN113294597A (zh) * 2021-04-30 2021-08-24 上海奉贤钢管厂有限公司 液压管路用复合不锈钢管及其生产工艺

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3156042A (en) * 1962-04-10 1964-11-10 Smith Corp A O Method of making duplex wall tubing
US3397445A (en) * 1965-09-30 1968-08-20 Ulmer Method of making bimetal tubing
JPH0890258A (ja) * 1994-09-19 1996-04-09 Mitsubishi Materials Corp クラッドパイプの製造方法
WO2004103603A1 (fr) * 2003-05-20 2004-12-02 Cladtek International Pty Ltd Production de tuyaux gaines
US20110017807A1 (en) * 2009-07-23 2011-01-27 Chakravarti Management, Llc Method for rolled seamless clad pipes

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3156042A (en) * 1962-04-10 1964-11-10 Smith Corp A O Method of making duplex wall tubing
US3397445A (en) * 1965-09-30 1968-08-20 Ulmer Method of making bimetal tubing
JPH0890258A (ja) * 1994-09-19 1996-04-09 Mitsubishi Materials Corp クラッドパイプの製造方法
WO2004103603A1 (fr) * 2003-05-20 2004-12-02 Cladtek International Pty Ltd Production de tuyaux gaines
US20110017807A1 (en) * 2009-07-23 2011-01-27 Chakravarti Management, Llc Method for rolled seamless clad pipes

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP3181250A1 (fr) * 2015-12-15 2017-06-21 GFM - GmbH Procédé de fabrication de pièces métalliques creuses
WO2018009633A1 (fr) * 2016-07-07 2018-01-11 Bull Moose Tube Company Structures métalliques revêtues d'acier et leurs procédés de fabrication
US10765898B2 (en) 2016-07-07 2020-09-08 Bull Moose Tube Company Steel coated metal structures and methods of fabricating the same
CN106545718A (zh) * 2017-01-22 2017-03-29 江苏顺通管业有限公司 一种高性能有缝三通
WO2018196622A1 (fr) * 2017-04-28 2018-11-01 杰森能源技术有限公司 Tube spiralé en acier composite à haute performance, résistant à la corrosion et économique et son procédé de fabrication
CN113294597A (zh) * 2021-04-30 2021-08-24 上海奉贤钢管厂有限公司 液压管路用复合不锈钢管及其生产工艺

Also Published As

Publication number Publication date
AR097428A1 (es) 2016-03-16
WO2014169365A3 (fr) 2014-12-24
BR102013021662A2 (pt) 2014-09-02

Similar Documents

Publication Publication Date Title
AU2020203991B2 (en) Process for producing a multilayer pipe by expansion and multilayer pipe produced by said process
AU2020220106B2 (en) Process for producing a multilayer pipe having a metallurgical bond by drawing, and multilayer pipe produced by this process
WO2014169365A2 (fr) Tuyau à couches multiples
CN101905375A (zh) 薄壁金属管路磁脉冲连接方法与接头结构
CN110293149B (zh) 一种双金属复合毛管的制作装置及制作方法
US20040060608A1 (en) Flexible fluid line connector assembly with brazed end fittings
JP4411114B2 (ja) 合金被覆ボイラ部品、及び自溶合金被覆ボイラ部品の溶接施工方法
US6329079B1 (en) Lined alloy tubing and process for manufacturing the same
US8281976B2 (en) Method of making multi-component composite metallic tube
US8672621B2 (en) Welded structural flats on cases to eliminate nozzles
US20190022801A1 (en) Method of making a corrosion resistant tube
EA017045B1 (ru) Двухслойная металлическая труба и способ изготовления двухслойной металлической трубы
JP2015529563A (ja) 抵抗シーム溶接を用いるクラッド材の製造のためのシステム
Collie et al. State-of-the-art production processes for convoluted, corrosion-resistant, high-pressure oilfield pipework
CN116833607A (zh) 一种复合双金属管焊接方法和复合双金属管体
EP3797239A1 (fr) Élément tubulaire et ensembles associés
JPH081339A (ja) 9クロム1モリブデン鋼管の多層盛溶接部構造
JPH0450129B2 (fr)
JPH0381069A (ja) 耐食二重管の管端シール溶接方法

Legal Events

Date Code Title Description
NENP Non-entry into the national phase in:

Ref country code: DE

121 Ep: the epo has been informed by wipo that ep was designated in this application

Ref document number: 14747801

Country of ref document: EP

Kind code of ref document: A2

122 Ep: pct application non-entry in european phase

Ref document number: 14747801

Country of ref document: EP

Kind code of ref document: A2