WO2017012131A1 - Anticorrosive pipeline having inner epoxy and outer 3pe without inner anticorrosive layer repairing after welding and preparation process therefor - Google Patents

Anticorrosive pipeline having inner epoxy and outer 3pe without inner anticorrosive layer repairing after welding and preparation process therefor Download PDF

Info

Publication number
WO2017012131A1
WO2017012131A1 PCT/CN2015/085158 CN2015085158W WO2017012131A1 WO 2017012131 A1 WO2017012131 A1 WO 2017012131A1 CN 2015085158 W CN2015085158 W CN 2015085158W WO 2017012131 A1 WO2017012131 A1 WO 2017012131A1
Authority
WO
WIPO (PCT)
Prior art keywords
pipe
anticorrosive
epoxy
welding
weld
Prior art date
Application number
PCT/CN2015/085158
Other languages
French (fr)
Chinese (zh)
Inventor
桑洪涛
赵明印
丛悦增
邓建新
Original Assignee
潍坊亿斯特管业科技有限公司
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority to CN201510425177.0A priority Critical patent/CN105003751A/en
Priority to CN201510425177.0 priority
Application filed by 潍坊亿斯特管业科技有限公司 filed Critical 潍坊亿斯特管业科技有限公司
Publication of WO2017012131A1 publication Critical patent/WO2017012131A1/en

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
    • F16L13/00Non-disconnectible pipe-joints, e.g. soldered, adhesive or caulked joints
    • F16L13/02Welded joints

Abstract

Provided are an anticorrosive pipeline having an inner epoxy and an outer 3PE without inner anticorrosive layer repairing after welding and a preparation process therefor. A dual metal structure is compounded in advance at the inner wall of an end of a pipeline body (2), then an anticorrosive treatment is carried out, and an anticorrosive layer, the metal structure and the wall of the pipeline are closely combined to form a complete, continuous and property-consistent inner anticorrosive layer. After the completion of a welding procedure on the anticorrosive pipeline having an inner epoxy and an outer 3PE, the inner anticorrosive layer will not be affected, and no inner anticorrosive layer repairing operation is needed.

Description

焊接后内防腐层免修补的内环氧外 3PE 防腐管道及其制备工艺  Inner epoxy outer 3PE anticorrosive pipeline without internal repair of inner coating after welding and preparation process thereof 焊接后内防腐层免修补的内环氧外 3PE 防腐管道及其制备工艺  Inner epoxy outer 3PE anticorrosive pipeline without internal repair of inner coating after welding and preparation process thereof
技术领域 Technical field
本发明涉及一种防腐管道,适用于内环氧外 3PE 防腐管道,尤其适用于焊接后内防腐层免修补的内环氧外 3PE 防腐管道,具体地说,涉及一种焊接后内防腐层免修补的内环氧外 3PE 防腐管道及其制备工艺。 The invention relates to an anticorrosive pipeline, which is suitable for an inner epoxy 3PE anticorrosive pipeline, and is especially suitable for an inner epoxy outer 3PE which is not repaired after welding. The anticorrosive pipe, in particular, relates to an inner epoxy outer 3PE anticorrosive pipe which is not repaired after welding, and a preparation process thereof.
背景技术 Background technique
用于输送流体(饮用水、工业用水、海水及各类气体)的内环氧外 3PE 防腐管道管线施工采用焊接连接方式,管端在焊接时存在长度为 60 ~ 100mm 左右的热影响区,内防腐涂层需要在焊接完成后进行二次修补作业,二次修补区段涂层防腐性能无法达到管体同等性能,而且仅限于 DN800 以上管径,中小口径管线因人工无法进行二次修补作业,存在热影响区无内防腐层的问题。管线在焊接热影响区形成防腐缺陷,管线在该区段容易出现锈蚀穿孔、爆裂等事故隐患,内环氧外 3PE 防腐管道良好的防腐蚀性能受到瓶颈制约。 Internal epoxy 3PE for transporting fluids (drinking water, industrial water, sea water and various gases) The anti-corrosion pipeline pipeline construction adopts the welding connection method, and the pipe end has a length of 60 to 100 mm during welding. In the heat affected zone of the left and right, the inner anti-corrosion coating needs to be repaired after the welding is completed. The anti-corrosion performance of the secondary repair section cannot achieve the same performance of the pipe, and is limited to DN800. For the above pipe diameters, the medium and small diameter pipelines cannot be repaired by manual work, and there is no problem of the inner anti-corrosion layer in the heat-affected zone. The pipeline forms anti-corrosion defects in the heat affected zone of the welding, and the pipeline is prone to accidents such as rust, perforation and bursting in the section. The good corrosion resistance of 3PE anti-corrosion pipes is subject to bottlenecks.
发明内容 Summary of the invention
本发明所要解决的技术问题是针对以上不足,提供一种焊接后内防腐层免修补的内环氧外 3PE 防腐管道,解决了现有技术中 DN800 以上管径的防腐管道二次修补后热影响区内涂层防腐性能差及中小口径防腐管道热影响区内无防腐层的问题,采用本发明的防腐管道后,无需进行修补作业,防腐管道内壁具有完整连续、性能一致的内防腐层,热影响区防腐性能好,且使用寿命长,至少可达到 50 年以上。 The technical problem to be solved by the present invention is to provide an inner epoxy outer 3PE which is repair-free after the inner anti-corrosion layer is repaired. Anti-corrosion pipeline, solving the prior art DN800 After the secondary repair of the above-mentioned pipe diameter, the anti-corrosion performance of the coating in the heat-affected zone is poor and there is no anti-corrosion layer in the heat-affected zone of the small- and medium-diameter anti-corrosion pipe. After the anti-corrosion pipe of the invention is used, no repair work is required, and the inner wall of the anti-corrosion pipe is not required. It has a complete continuous and consistent internal anti-corrosion layer. The anti-corrosion performance of the heat-affected zone is good, and the service life is long, at least More than 50 years.
本发明还提供一种焊接后内防腐层免修补的内环氧外 3PE 防腐管道的制备工艺,适应性广,无论管径大小均可实现内防腐层的连贯性; The invention also provides an inner epoxy outer 3PE which is repair-free after the inner anti-corrosion layer is welded. The preparation process of the anti-corrosion pipeline has wide adaptability, and the consistency of the inner anti-corrosion layer can be achieved regardless of the diameter of the pipeline;
管道焊接后无需对热影响区进行内防腐层的修补作业,具有工艺简单、易操作、费用低廉、安全系数高的优点; After the pipeline is welded, it is not necessary to repair the inner anti-corrosion layer in the heat-affected zone, and has the advantages of simple process, easy operation, low cost and high safety factor;
采用本发明的制备工艺,防腐管道管线施工效率高且质量好。 With the preparation process of the invention, the anti-corrosion pipeline pipeline has high construction efficiency and good quality.
为解决上述技术问题,本发明的技术方案是:焊接后内防腐层免修补的内环氧外 3PE 防腐管道,包括管道本体,其特征在于:所述管道本体端部设有管端构件。 In order to solve the above technical problem, the technical solution of the present invention is: the inner epoxy outer layer 3PE which is not repaired after the inner anti-corrosion layer is welded. The anticorrosive pipe comprises a pipe body, wherein the pipe body end is provided with a pipe end member.
一种优化方案,所述管端构件贴合在管道本体的内壁形成环状。 In an optimized solution, the pipe end member is attached to the inner wall of the pipe body to form an annular shape.
另一种优化方案,所述管端构件的外侧超出管道本体端部 2 ~ 3mm 。 In another optimization, the outer side of the pipe end member is 2 to 3 mm beyond the end of the pipe body.
再一种优化方案,所述管端构件内外两侧及对接处封闭焊接。 In another optimization scheme, the inner and outer sides of the pipe end member and the butt joint are closed and welded.
进一步的优化方案,所述管端构件呈长条状。 In a further optimization, the tube end member is elongated.
再进一步的优化方案,所述管端构件为不锈钢板材。 In a further optimization, the tube end member is a stainless steel sheet.
本发明还提供一种焊接后内防腐层免修补的内环氧外 3PE 防腐管道的制备工艺,其特征在于:所述制备工艺包括组对装配步骤。 The invention also provides an inner epoxy outer 3PE which is repair-free after the inner anti-corrosion layer is welded. A process for preparing an anticorrosive pipe, characterized in that the preparation process comprises a pairwise assembly step.
一种优化方案,所述组对装配步骤包括:将管端构件安装在管道本体内部,其外侧超出管道本体端面 2 ~ 3mm ,并用膨胀工装将管端构件压接在管道本体内壁上。 An optimization solution, the group pair assembly step comprises: installing the pipe end member inside the pipe body, the outer side of which is beyond the end face of the pipe body 2 to 3 mm And crimping the pipe end member to the inner wall of the pipe body with an expansion tooling.
另一种优化方案,所述制备工艺还包括复合焊接步骤。 In another preferred embodiment, the preparation process further includes a composite welding step.
再一种优化方案,所述合焊接步骤包括:沿管端构件内外两侧及对接处进行封闭焊接,形成由外侧焊缝、内侧焊缝和对接处焊缝构成的连续焊缝,焊缝延伸至管道本体端面,管端构件与管道本体形成牢固、完整的复合体。 In another optimization scheme, the welding step includes: performing closed welding along the inner and outer sides of the pipe end member and the butting joint to form a continuous weld formed by the outer weld seam, the inner weld seam and the butt joint weld seam, and the weld seam is extended. To the end face of the pipe body, the pipe end member forms a firm and complete composite body with the pipe body.
本发明采用以上技术方案,与现有技术相比,具有以下优点:在管道本体端部内壁预先复合一个双金属结构,然后再进行防腐处理,防腐层、金属结构、管壁紧密结合,形成一个完整连续、性能一致的内防腐层,内环氧外 3PE 防腐管道在完成焊接施工后,不会对内防腐层造成影响,且不需要内防腐层修补作业。 The invention adopts the above technical solution, and has the following advantages compared with the prior art: a double metal structure is pre-composited on the inner wall of the end portion of the pipe body, and then the anti-corrosion treatment is performed, and the anti-corrosion layer, the metal structure and the pipe wall are tightly combined to form a Complete continuous, consistent performance inner coating, internal epoxy After the completion of the welding construction, the 3PE anti-corrosion pipeline will not affect the internal anti-corrosion layer and does not require the internal anti-corrosion layer repair operation.
本发明采用双金属预制与焊接相结合的方式,将耐腐蚀性的金属板材用环形可膨胀工装压接在管端内部,且板材外侧超出管端 2 ~ 3mm ,焊接完成后,在管道本体端部形成了具备防腐性能的复合体,可以适应现有各类钢塑复合管的生产工艺。 The invention adopts the combination of bimetal prefabrication and welding, and the corrosion resistant metal plate is crimped into the inside of the pipe end by the annular expandable tooling, and the outer side of the plate exceeds the pipe end by 2 to 3 mm. After the welding is completed, a composite body with anti-corrosion performance is formed at the end of the pipe body, which can adapt to the production process of the existing various steel-plastic composite pipes.
1 、双金属复合体具备良好的焊接性能,管线焊接施工时采用现有方式即可进行,焊接后内防腐层自然形成完整性、一致性,完全避免进行内防腐层二次修补以及无法修补带来的整体管线质量下降、寿命缩短问题,解决操作繁琐、费用昂贵、存在施工人员安全风险的修补难题; 1 The bimetal composite has good welding performance. The pipeline welding can be carried out by the existing method. After welding, the inner coating naturally forms integrity and consistency, completely avoiding the secondary repair of the inner coating and the inability to repair. The overall pipeline quality is degraded, the life is shortened, and the repairing problems of cumbersome operation, high cost, and safety risks of construction workers are solved;
2 、内防腐层一次成型,无需修补,端部采用的耐腐蚀性的金属板材焊接的模式,大大地提高了防腐管道的性能,延长使用寿命,至少达到 50 年以上。 2 The inner anti-corrosion layer is formed at one time without repairing, and the corrosion-resistant metal sheet welding mode adopted at the end greatly improves the performance of the anti-corrosion pipeline and prolongs the service life, at least 50 years.
下面结合附图和实施例对本发明进行详细说明。 The invention will now be described in detail in conjunction with the drawings and embodiments.
附图说明 DRAWINGS
附图 1 是本发明实施例中管端构件的结构示意图; 1 is a schematic structural view of a pipe end member in an embodiment of the present invention;
附图 2 是本发明实施例中防腐管道的制备状态结构示意图; 2 is a schematic structural view showing a state of preparation of an anticorrosive pipe in an embodiment of the present invention;
附图 3 是本发明实施例中防腐管道管端的结构示意图。 Figure 3 is a schematic view showing the structure of the pipe end of the anticorrosive pipe in the embodiment of the present invention.
图中, In the picture,
1- 管端构件, 2- 管道本体, 3- 膨胀工装, 4- 外侧焊缝, 5- 内侧焊缝, 6- 对接处焊缝。 1- Pipe end member, 2- Pipe body, 3- Expansion tooling, 4- Outside weld, 5- Inside weld, 6- Butt welds.
具体实施方式 detailed description
实施例 1 ,如图 1 、图 2 和图 3 所示,焊接后内防腐层免修补的内环氧外 3PE 防腐管道,包括管道本体 2 ,管道本体 2 为内环氧外 3PE 防腐钢管,管道本体 2 端部设有管端构件 1 ,管端构件 1 呈长条状,管端构件 1 采用不锈钢板材,管端构件 1 贴合在管道本体 2 的内壁形成环状,管端构件 1 与管道本体 2 焊接,管端构件 1 的外侧超出管道本体 2 端部 2 ~ 3mm 。 Example 1 , as shown in Fig. 1, Fig. 2 and Fig. 3, the inner epoxy layer 3PE without internal repair of the inner coating after welding Anti-corrosion pipe, including pipe body 2, pipe body 2 is an inner epoxy 3PE anti-corrosion steel pipe, pipe end member 2 is provided with pipe end member 1 , pipe end member 1 is elongated, pipe end member 1 The stainless steel sheet is used, and the pipe end member 1 is attached to the inner wall of the pipe body 2 to form an annular shape, and the pipe end member 1 is welded to the pipe body 2, and the outer side of the pipe end member 1 is beyond the end portion of the pipe body 2 2 3mm.
本实施例中的管端构件 1 还可采用具备耐腐蚀性能的其他金属板材。 The pipe end member 1 in this embodiment can also be made of other metal sheets having corrosion resistance.
实施例 2 ,焊接后内防腐层免修补的内环氧外 3PE 防腐管道的制备工艺,包括以下步骤: Example 2: The preparation process of the inner epoxy outer 3PE anticorrosive pipe without internal repair of the inner anticorrosion layer after welding, comprising the following steps:
1 )管道本体预制。 1) The pipe body is prefabricated.
采用各类成型方式制造的钢管均可作为原材料使用。 Steel pipes manufactured by various molding methods can be used as raw materials.
2 )管端构件预制。 2) The pipe end member is prefabricated.
具备耐腐蚀性能的金属板材,本实施例中采用不锈钢,经剪切制作成条形。 The metal plate having corrosion resistance is made of stainless steel in this embodiment and is formed into a strip shape by shearing.
3 )组对装配。 3) Group pair assembly.
将管端构件 1 安装在管道本体 2 内部,其外侧超出管道本体 2 端面 2 ~ 3mm ,并用膨胀工装 3 将管端构件 1 压接在管道本体 2 内壁上。 The pipe end member 1 is installed inside the pipe body 2, and the outer side thereof is beyond the end face of the pipe body 2 by 2 to 3 mm, and the expansion tool is used 3 The pipe end member 1 is crimped onto the inner wall of the pipe body 2.
4 )复合焊接。 4) Composite welding.
用电焊枪沿管端构件 1 内外两侧及对接处进行封闭焊接,形成由外侧焊缝 4 、内侧焊缝 5 和对接处焊缝 6 构成的连续焊缝,焊缝延伸至管道本体 2 端面,管端构件 1 与管道本体 2 形成牢固、完整的复合体。 The welding torch is welded along the inner and outer sides of the pipe end member 1 and the butt joint to form the weld seam from the outer weld 4, the inner weld 5 and the butt joint 6 The continuous weld is formed, and the weld extends to the end face of the pipe body 2, and the pipe end member 1 forms a firm and complete composite with the pipe body 2.
以上所述为本发明最佳实施方式的举例,其中未详细述及的部分均为本领域普通技术人员的公知常识。本发明的保护范围以权利要求的内容为准,任何基于本发明的技术启示而进行的等效变换,也在本发明的保护范围之内。 The above is an example of a preferred embodiment of the present invention, and parts that are not described in detail are common knowledge of those skilled in the art. The scope of the present invention is defined by the scope of the claims, and any equivalent transformation based on the teachings of the present invention is also within the scope of the present invention.

Claims (10)

1. 焊接后内防腐层免修补的内环氧外 3PE 防腐管道,包括管道本体( 2 ),其特征在于:所述管道本体( 2 )端部设有管端构件( 1 )。 1. The inner epoxy outer 3PE anticorrosive pipe without internal repair of the inner coating after welding, including the pipe body (2), characterized in that: the pipe body (2) The end is provided with a pipe end member (1).
2. 如权利要求 1 所述的焊接后内防腐层免修补的内环氧外 3PE 防腐管道,其特征在于:所述管端构件( 1 )贴合在管道本体( 2 )的内壁形成环状。2. The inner epoxy outer 3PE anticorrosive pipe of the post-weld inner anti-corrosion layer repaired according to claim 1, wherein the pipe end member (1) The inner wall of the pipe body (2) is formed into a ring shape.
3. 如权利要求 1 所述的焊接后内防腐层免修补的内环氧外 3PE 防腐管道,其特征在于:所述管端构件( 1 )的外侧超出管道本体( 2 )端部 2 ~ 3mm 。3. The inner epoxy outer 3PE anticorrosive pipe of the post-weld inner anti-corrosion layer repaired according to claim 1, wherein the pipe end member (1) The outer side of the pipe body (2) is 2 to 3 mm beyond the end of the pipe body.
4. 如权利要求 1 所述的焊接后内防腐层免修补的内环氧外 3PE 防腐管道,其特征在于:所述管端构件( 1 )内外两侧及对接处封闭焊接。4. The inner epoxy outer 3PE anticorrosive pipe of the post-weld inner anti-corrosion layer repaired according to claim 1, wherein the pipe end member (1) ) The inner and outer sides and the butt joint are closed for welding.
5. 如权利要求 1 所述的焊接后内防腐层免修补的内环氧外 3PE 防腐管道,其特征在于:所述管端构件( 1 )呈长条状。5. The inner epoxy outer 3PE anticorrosive pipe of the post-weld inner anti-corrosion layer repaired according to claim 1, wherein the pipe end member (1) ) is long strips.
6. 如权利要求 1 所述的焊接后内防腐层免修补的内环氧外 3PE 防腐管道,其特征在于:所述管端构件( 1 )为不锈钢板材。6. The inner epoxy outer 3PE anticorrosive pipe of the post-weld inner anti-corrosion layer repaired according to claim 1, wherein the pipe end member (1) ) is a stainless steel sheet.
7. 如权利要求 1-6 其中之一所述的防腐管道的制备工艺,其特征在于:所述制备工艺包括组对装配步骤。7. Claims 1-6 The preparation process of the anticorrosive pipe according to any one of the above, characterized in that the preparation process comprises a group pair assembly step.
8. 如权利要求 7 所述的制备工艺,其特征在于:所述组对装配步骤包括:将管端构件( 1 )安装在管道本体( 2 )内部,其外侧超出管道本体( 2 )端面 2 ~ 3mm ,并用膨胀工装( 3 )将管端构件( 1 )压接在管道本体( 2 )内壁上。8. The preparation process according to claim 7, wherein the assembly step comprises: installing the pipe end member (1) on the pipe body (2) Inside, the outer side of the pipe body (2) is 2 to 3 mm beyond the end face of the pipe body, and the pipe end member (1) is crimped to the pipe body by the expansion tooling (3) (2) ) on the inner wall.
9. 如权利要求 7 所述的制备工艺,其特征在于:所述制备工艺还包括复合焊接步骤。9. The preparation process according to claim 7, wherein the preparation process further comprises a composite welding step.
10. 如权利要求 9 所述的制备工艺,其特征在于:所述合焊接步骤包括:沿管端构件( 1 )内外两侧及对接处进行封闭焊接,形成由外侧焊缝( 4 )、内侧焊缝( 5 )和对接处焊缝( 6 )构成的连续焊缝,焊缝延伸至管道本体( 2 )端面,管端构件( 1 )与管道本体( 2 )形成牢固、完整的复合体。10. The preparation process according to claim 9, wherein the step of welding comprises: along the pipe end member (1) The inner and outer sides and the butt joint are closed welded to form a continuous weld consisting of the outer weld (4), the inner weld (5) and the butt weld (6), and the weld extends to the end of the pipe body (2) , pipe end member ( 1) Form a strong, complete composite with the pipe body ( 2 ).
PCT/CN2015/085158 2015-07-20 2015-07-27 Anticorrosive pipeline having inner epoxy and outer 3pe without inner anticorrosive layer repairing after welding and preparation process therefor WO2017012131A1 (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
CN201510425177.0A CN105003751A (en) 2015-07-20 2015-07-20 Inside-epoxy outside-3PE corrosion-preventing pipeline with inner corrosion-preventing layer free of repairing after welding and manufacturing process of inside-epoxy outside-3PE corrosion-preventing pipeline
CN201510425177.0 2015-07-20

Publications (1)

Publication Number Publication Date
WO2017012131A1 true WO2017012131A1 (en) 2017-01-26

Family

ID=54376537

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/CN2015/085158 WO2017012131A1 (en) 2015-07-20 2015-07-27 Anticorrosive pipeline having inner epoxy and outer 3pe without inner anticorrosive layer repairing after welding and preparation process therefor

Country Status (2)

Country Link
CN (1) CN105003751A (en)
WO (1) WO2017012131A1 (en)

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN201196298Y (en) * 2008-05-28 2009-02-18 大庆石油新科庆联防腐有限公司 Round die negative-phase shaping three-layer PE corrosion-proof pipe
CN202561297U (en) * 2012-02-20 2012-11-28 大连合生科技开发有限公司 Pipeline for transporting petroleum and natural gas
CN203131326U (en) * 2013-01-23 2013-08-14 山东华政塑胶科技发展有限公司 3PE anticorrosion steel tube for supplying water
CN204879085U (en) * 2015-07-20 2015-12-16 潍坊亿斯特管业科技有限公司 Outer 3PE anticorrosion pipeline of interior epoxy of benefit is excused from a college course to anticorrosive coating in welding back

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2564938B1 (en) * 1984-05-24 1986-11-28 Atochem NEW INTERIOR COATED TUBE CONNECTION AND MANUFACTURING METHOD THEREOF
RU2162188C1 (en) * 2000-04-25 2001-01-20 Общество с ограниченной ответственностью Научно-производственное предприятие "Антикормаш" Method of rust protection of welded butt joints of pipelines with internal coating
CN201436131U (en) * 2009-06-22 2010-04-07 宝山钢铁股份有限公司 Inner ring sleeve used for repairing steel coil
CN202017833U (en) * 2011-04-29 2011-10-26 潍坊金通管业有限公司 Bimetal connecting device for plastic-coated steel tube
CN203023743U (en) * 2013-01-30 2013-06-26 赵森龙 Composite pipe with corrosion-resistant alloy joint
CN103612020B (en) * 2013-12-10 2015-12-30 北京隆盛泰科石油管科技有限公司 Clad steel plate is adopted to be added the composite tube production method of built-up welding mode by electric resistance welding
CN103982748B (en) * 2014-06-10 2015-12-30 武汉中地管通非开挖科技有限公司 A kind of modified model pipeline stainless steel inner lining restorative procedure

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN201196298Y (en) * 2008-05-28 2009-02-18 大庆石油新科庆联防腐有限公司 Round die negative-phase shaping three-layer PE corrosion-proof pipe
CN202561297U (en) * 2012-02-20 2012-11-28 大连合生科技开发有限公司 Pipeline for transporting petroleum and natural gas
CN203131326U (en) * 2013-01-23 2013-08-14 山东华政塑胶科技发展有限公司 3PE anticorrosion steel tube for supplying water
CN204879085U (en) * 2015-07-20 2015-12-16 潍坊亿斯特管业科技有限公司 Outer 3PE anticorrosion pipeline of interior epoxy of benefit is excused from a college course to anticorrosive coating in welding back

Also Published As

Publication number Publication date
CN105003751A (en) 2015-10-28

Similar Documents

Publication Publication Date Title
KR100987355B1 (en) Pipe connecting device of non-welding
WO2013155703A1 (en) Articulated joint type middle-high pressure pipeline connecting piece
WO2017012131A1 (en) Anticorrosive pipeline having inner epoxy and outer 3pe without inner anticorrosive layer repairing after welding and preparation process therefor
CN104259645A (en) Welding process for titanium tube and tube plate
CN102848571B (en) A kind of plastic thin walled pipe cone hot-melting welding device and sweat soldering method
CN204403671U (en) A kind of repairing device of continuous in-service pipeline weld seam
WO2017070987A1 (en) Construction method for gas pipeline system
CN206347912U (en) A kind of heat exchanger tube sheet
CN204879085U (en) Outer 3PE anticorrosion pipeline of interior epoxy of benefit is excused from a college course to anticorrosive coating in welding back
WO2017219374A1 (en) Cladded structure based on tantalum plate and clad steel plate, and method for processing same
CN204159779U (en) A kind of Hydraulic expansion-jointing frock
CN204248325U (en) A kind of sheet-metal duct assembling tool
CN108443899A (en) A kind of soot blower structure
CN202561297U (en) Pipeline for transporting petroleum and natural gas
US1943035A (en) Method of producing tubing or pipe
KR101451504B1 (en) Method of fittings with overlay welding steel
CN209759492U (en) Flue connection structure
CN106181014A (en) A kind of metal tube pressure welding technique
CN201653242U (en) Fusion welding deformation-preventing header device
CN211667343U (en) Reducing joint convenient to install and used for air conditioner pipeline
WO2014132772A1 (en) Heat exchanger and method for manufacturing heat exchanger
CN211449959U (en) Flange structure for aluminum alloy vacuum system
SU884916A1 (en) Method of manufacturing welded shell-and-tube heat exchanger
CN210004027U (en) Stainless steel inner anti-corrosion heat distribution pipeline
US1826377A (en) Method of installing welded pipe systems and fittings therefor

Legal Events

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

Ref document number: 15898687

Country of ref document: EP

Kind code of ref document: A1

NENP Non-entry into the national phase in:

Ref country code: DE

122 Ep: pct application non-entry in european phase

Ref document number: 15898687

Country of ref document: EP

Kind code of ref document: A1