CN119554492A - A lined non-metallic composite steel pipe joint device with double sealing structure - Google Patents
A lined non-metallic composite steel pipe joint device with double sealing structure Download PDFInfo
- Publication number
- CN119554492A CN119554492A CN202311133129.5A CN202311133129A CN119554492A CN 119554492 A CN119554492 A CN 119554492A CN 202311133129 A CN202311133129 A CN 202311133129A CN 119554492 A CN119554492 A CN 119554492A
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- Prior art keywords
- steel
- flanges
- pipe
- lining
- sealing
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
- F16L23/00—Flanged joints
- F16L23/02—Flanged joints the flanges being connected by members tensioned axially
- F16L23/032—Flanged joints the flanges being connected by members tensioned axially characterised by the shape or composition of the flanges
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
- F16L23/00—Flanged joints
- F16L23/16—Flanged joints characterised by the sealing means
- F16L23/18—Flanged joints characterised by the sealing means the sealing means being rings
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
- F16L58/00—Protection of pipes or pipe fittings against corrosion or incrustation
- F16L58/18—Protection of pipes or pipe fittings against corrosion or incrustation specially adapted for pipe fittings
- F16L58/187—Protection of pipes or pipe fittings against corrosion or incrustation specially adapted for pipe fittings for flanged joints
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- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Flanged Joints, Insulating Joints, And Other Joints (AREA)
Abstract
本发明公开了一种具有双重密封结构的内衬非金属复合钢管接头装置，所述接头装置包括：与两个内衬非金属复合钢管中钢质基管端部分别连接的两个钢制法兰、耐蚀合金压环、密封垫以及固定部件；两个所述钢制法兰相对设置，并分别在两个所述钢制法兰密封面的中部设置第一凹槽；所述固定部件通过钢制法兰外缘上的螺栓孔将两个钢制法兰固定；所述耐蚀合金压环设置于所述第一凹槽内；所述密封垫设置在两个钢制法兰之间并位于钢制法兰的内缘。采用本结构，实现了内衬非金属复合钢管接头的双重密封，减少了现场泄漏风险，具有操作简单、安装迅速的优点。
The present invention discloses a lined non-metallic composite steel pipe joint device with a double sealing structure, the joint device comprises: two steel flanges respectively connected to the ends of the steel base pipes in the two lined non-metallic composite steel pipes, a corrosion-resistant alloy pressure ring, a sealing gasket and a fixing component; the two steel flanges are arranged opposite to each other, and a first groove is respectively arranged in the middle of the sealing surface of the two steel flanges; the fixing component fixes the two steel flanges through the bolt holes on the outer edges of the steel flanges; the corrosion-resistant alloy pressure ring is arranged in the first groove; the sealing gasket is arranged between the two steel flanges and located at the inner edge of the steel flange. The adoption of this structure realizes the double sealing of the lined non-metallic composite steel pipe joint, reduces the risk of leakage on site, and has the advantages of simple operation and quick installation.
Description
Technical Field
The invention relates to the technical field of lining nonmetallic composite steel pipe joints, in particular to a lining nonmetallic composite steel pipe joint device with a double sealing structure and an installation method.
Background
Problems of corrosion, scaling, waxing and the like in gathering pipelines are an important problem faced in many oilfield productions, and in order to solve the problems, the use of a lining nonmetallic composite steel pipe as a surface pipeline is not a less preferred option. The steel base pipe provides strength support for the composite pipe, and the nonmetallic liner pipe improves the corrosion resistance, scale prevention, drag reduction and other performances of the steel pipe. The non-metal lining pipe materials commonly used at present mainly comprise plastic materials such as polyethylene, polypropylene and the like, wherein the high-density polyethylene and the ultra-high molecular weight polyethylene are widely used, and particularly the ultra-high molecular weight polyethylene lining pipe has the characteristics of good wear resistance, toughness, acid resistance, alkali resistance, various salt corrosion resistance and the like, and is increasingly widely applied to gathering pipelines.
For the lining nonmetallic composite steel pipe gathering pipeline, the connecting joint is a key part of pipeline inner transmission medium leakage and pipeline corrosion, the quality of the connecting joint and the sealing effect thereof are key factors influencing the service life of the pipeline, and the connecting mode of the lining nonmetallic composite steel pipe joint at present mainly comprises welding, clamp connection, flange connection and the like. However, the on-site welding joint can adopt an inner anti-corrosion joint coating or UB lining technology to carry out inner anti-corrosion on joint parts of the welded joint lining nonmetallic composite steel pipes, but because the common caliber of a gathering pipeline is smaller, the inner anti-corrosion joint coating technology is difficult to construct, high in cost and high in quality control difficulty, and because the UB lining and the lining are difficult to bond and quality check, and the UB lining has the risk of burning in the subsequent welding process, transmission mediums in the pipeline easily enter the interface of a base pipe and a liner pipe from a poor bonding part or a lining burning part, so that the base pipe is corroded. In addition, at present, the clamp and the flange connection are common connection methods for lining nonmetallic composite steel pipes, and the pipe end flange is tightly pressed on the lining flanging by fastening the clamp or the bolt, so that the flanging lining materials on two sides of the joint and the sealing ring are tightly attached to each other, and the sealing effect is achieved. However, in actual operation, due to the influence of factors such as mechanical assembly errors, irregular construction operations and the like, the fastening force of the clamp and the bolt is difficult to ensure, the sealing effect of the pipe end lining layer cannot be ensured, and when the surface of the flanging lining material is damaged, the damaged parts are very easy to be the channels for leakage of medium in the pipeline.
Therefore, development of a lining nonmetallic composite pipe joint sealing structure with good sealing effect, which can ensure that the medium in the pipeline is not leaked and is not contacted with the steel base pipe, ensure joint connection strength, facilitate field installation and simultaneously have lower overall cost so as to meet the field use requirement is needed.
Disclosure of Invention
The invention aims to provide the lining nonmetallic composite steel pipe joint device with the double sealing structure, which has good sealing effect, can ensure that the medium in the pipeline is not leaked and contacted with the steel base pipe, can ensure the joint connection strength, and is convenient for field installation.
In order to achieve the aim, the invention provides a lining nonmetallic composite steel pipe joint device with a double sealing structure, which comprises two steel flanges, a corrosion-resistant alloy compression ring, a sealing gasket and a fixing part, wherein the two steel flanges are respectively connected with the steel base pipe ends of two lining nonmetallic composite steel pipes;
The two steel flanges are oppositely arranged, first grooves are respectively formed in the middle parts of sealing surfaces of the two steel flanges, the two steel flanges are fixed by the fixing part through bolt holes on the outer edges of the two steel flanges, the corrosion-resistant alloy compression ring is arranged in the first grooves, and the sealing gasket is arranged between the two steel flanges and is positioned at the inner edges of the two steel flanges.
Optionally, the lining nonmetallic composite steel pipe further comprises a nonmetallic lining pipe inserted into the steel base pipe, wherein a nonmetallic lining pipe with a preset length is reserved at the pipe end of the lining nonmetallic composite steel pipe, and the nonmetallic lining pipe with the preset length is subjected to flanging treatment to form a nonmetallic covering layer covering the sealing surface of the corresponding steel flange.
Optionally, forming a second groove and a flanging step respectively by pressing nonmetallic covering layers on the sealing surfaces of the two steel flanges;
Correspondingly, the corrosion-resistant alloy compression ring is arranged in the second groove, and the sealing gasket is arranged at the step of the flanging step.
Optionally, the nonmetallic lining pipe is a nonmetallic pipe made of polyethylene or polypropylene.
Optionally, the joint device further comprises a weld for connecting the steel base pipe end and the steel flange.
Optionally, the steel flange is a neck butt welding flange.
Optionally, the fixing component comprises a component consisting of a bolt and a nut.
Optionally, the material of the corrosion-resistant alloy compression ring is determined according to the conveying medium of the lining nonmetallic composite steel pipe.
Optionally, the sealing gasket is made of polytetrafluoroethylene sealing gasket and fluororubber.
The invention also provides a method for installing the joint device, which comprises the following steps:
placing the corrosion-resistant alloy compression ring in the first groove, and arranging the sealing gasket between the two steel flanges and at the inner edge of the steel flanges;
Aligning two steel flanges respectively connected with the steel base pipe ends in the two lining nonmetallic composite steel pipes;
Fastening the two steel flanges by a fixing part;
the two steel flanges are arranged oppositely, first grooves are respectively formed in the middle parts of sealing surfaces of the two steel flanges, and the corrosion-resistant alloy compression ring is arranged in the first grooves.
The invention has the technical effects and advantages that:
1. The invention adopts the corrosion-resistant alloy compression ring and the sealing gasket for double sealing, thereby reducing the risk of joint leakage. 2. And an annular groove is processed on the sealing surface of the butt welding flange with the neck, so that the corrosion-resistant alloy compression ring is conveniently placed, and the flange of the lining layer on the end surface of the flange is tightly pressed. 3. And a step is formed on the nonmetallic covering layer of the flange sealing surface by pressing, so that the sealing ring is convenient to position. 4. By selecting sealing gaskets with different thicknesses and corrosion-resistant alloy compression rings and adjusting the gap between the two flanges, different compression ratios of the sealing gaskets and flanging materials can be realized so as to meet the requirements of on-site working conditions.
Additional features and advantages of the invention will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. The objectives and other advantages of the invention may be realized and attained by the structure particularly pointed out in the written description and drawings.
Drawings
FIG. 1 is a first block diagram of a lined non-metallic composite steel pipe joint device having a dual seal structure;
FIG. 2 is an enlarged view of a portion of the groove and flange step of the structure of FIG. 1;
FIG. 3 is a second block diagram of a lined non-metallic composite steel pipe joint apparatus;
FIG. 4 is a third block diagram of a lined non-metallic composite steel pipe joint apparatus;
the drawing shows that the steel base pipe is 1-steel, the nonmetallic lining pipe is 2-, the welding seam is 3-, the bolt is 4-, the steel flange is 5-, the corrosion-resistant alloy pressure ring is 6-, the sealing gasket is 7-, the nut is 8-, the groove is 9-, the flanging step is 10-and the clamp is 11-.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and fully with reference to the accompanying drawings, in which some, but not all embodiments of the invention are shown. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
It should be noted that, the structures, proportions, sizes and the like shown in the drawings attached to the present specification are used for understanding and reading only in conjunction with the disclosure of the present specification, and are not intended to limit the applicable limitations of the present invention, so that any modification of the structures, variation of proportions or adjustment of sizes of the structures, proportions and the like should not be construed as essential to the present invention, and should still fall within the scope of the disclosure of the present invention without affecting the efficacy and achievement of the present invention. Also, the terms such as "upper," "lower," "left," "right," "middle," and "a" and the like recited in the present specification are merely for descriptive purposes and are not intended to limit the scope of the invention, but are intended to provide relative positional changes or modifications without materially altering the technical context in which the invention may be practiced.
In order to solve the defects in the prior art, the invention discloses a lining nonmetallic composite steel pipe joint device with a double sealing structure, which comprises two steel flanges, corrosion-resistant alloy compression rings, sealing gaskets and fixing parts, wherein the two steel flanges are respectively connected with the steel base pipe ends of two lining nonmetallic composite steel pipes; the two steel flanges are oppositely arranged, first grooves are respectively formed in the middle parts of sealing surfaces of the two steel flanges, the two steel flanges are fixed by the fixing part through bolt holes on the outer edges of the two steel flanges, the corrosion-resistant alloy compression ring is arranged in the first grooves, and the sealing gasket is arranged between the two steel flanges and is positioned at the inner edges of the two steel flanges. The device can ensure that the medium in the pipeline is not leaked and contacted with the steel base pipe, can ensure the joint connection strength, is convenient for field installation, and has a low overall cost, so as to meet the field use requirement.
For a better understanding of the present solution, the following description will be given in detail with reference to fig. 1 for a liner nonmetallic composite steel pipe joint device with a dual sealing structure, which is specifically as follows:
The joint device comprises two steel flanges 5, a corrosion-resistant alloy compression ring 6, a sealing gasket 7 and a fixing part for fixing the two steel flanges, wherein the two steel flanges 5 are respectively connected with the end parts of the steel base pipes 1 in the two lining nonmetallic composite steel pipes.
Wherein, two steel flanges 5 are arranged oppositely, and a first groove 9 is respectively arranged on the sealing surfaces of the two steel flanges. The steel flange 5 is a neck butt welding flange (the size and the number and the specification of fastening studs can be referred to GB/T9124-2019 steel pipe flange), an annular first groove 9 is processed on the sealing surface of the steel flange 5, the steel flange 5 and the steel base pipe 1 are made of the same or similar materials, and the steel flange is welded at the end part of the steel base pipe 1 through a welding line 3.
The lining nonmetallic composite steel pipe comprises a steel base pipe 1 and a nonmetallic lining pipe 2. The nonmetallic lining pipe 2 is slightly larger than the inner diameter of the steel base pipe 1 in outer diameter, is inserted into the steel base pipe 1 welded with the steel flange 5, forms interference fit with the base pipe, and is reserved with a certain length of nonmetallic lining pipe 2 at the pipe end. The nonmetallic liner tube 2 is a nonmetallic tube made of polyethylene, polypropylene, or the like.
After the steel base pipe 1 and the nonmetallic lining pipe 2 are penetrated and compounded, the nonmetallic lining pipe 2 reserved at the pipe end is heated after stress release, and the nonmetallic lining pipe 2 is subjected to flanging treatment at the pipe end to form a nonmetallic covering layer covering the end face of the steel flange 5. During flanging, a special die is adopted, and a second groove and a flanging step 10 are formed on the nonmetallic covering layer on the end face of the steel flange 5 in a pressing mode, as shown in fig. 2.
Wherein, the corrosion resistant alloy clamping ring 6 is arranged in the second groove. Specifically, the corrosion-resistant alloy compression ring can be made of stainless steel, nickel-based alloy, copper alloy and other materials according to different internal transmission media, the sealing gasket 7 is arranged at the step of the flanging step, and the sealing gasket is made of polytetrafluoroethylene, fluororubber and the like.
Wherein, the fixed part sets up in the outer fringe of steel flange. In particular, the fixing parts are bolts 4 and nuts 8.
It should be noted that the non-metallic cover layer may also be machined to be planar, with the end face of the liner flange being the sealing face, i.e. in this alternative only a corrosion resistant alloy press ring is present, and the end face of the flange structure is also the sealing face, as shown in fig. 3. The concrete principle is that the end surfaces of the flanging structure are mutually pressed, the contact surface is used as a sealing surface, and the pressing ring presses the lining flanging to realize sealing.
It should be noted that the invention can also design two steel flanges to be conical, and the clamping hoop 11 is used for fastening the two flanges by fastening a clamping hoop bolt, as shown in fig. 4.
The invention discloses a lining nonmetallic composite steel pipe joint device with a double sealing structure, which comprises two steel flanges, corrosion-resistant alloy compression rings, sealing gaskets and fixing parts, wherein the two steel flanges are respectively connected with steel base pipe ends in two lining nonmetallic composite steel pipes, the two steel flanges are oppositely arranged, first grooves are respectively formed in the middle parts of sealing surfaces of the two steel flanges, the fixing parts fix the two steel flanges through bolt holes on the outer edges of the steel flanges, the corrosion-resistant alloy compression rings are arranged in the first grooves, and the sealing gaskets are arranged between the two steel flanges and are positioned at the inner edges of the steel flanges. By adopting the structure, double sealing of the lining nonmetallic composite steel pipe joint is realized, the on-site leakage risk is reduced, and the structure has the advantages of simplicity in operation and rapidness in installation.
The invention further provides an installation method of the joint device, which comprises the steps of placing a corrosion-resistant alloy compression ring in a first groove, arranging a sealing gasket between two steel flanges and at the inner edges of the steel flanges, aligning two steel flanges respectively connected with steel base pipe ends in two lining nonmetallic composite steel pipes, and fastening the two steel flanges through a fixing part, wherein the two steel flanges are oppositely arranged, the first grooves are respectively arranged in the middle parts of sealing surfaces of the two steel flanges, and the corrosion-resistant alloy compression ring is arranged in the first grooves.
Since the method is similar to the apparatus, the description will not be repeated, with specific reference to the apparatus.
It should be noted that the foregoing description is only a preferred embodiment of the present invention, and although the present invention has been described in detail with reference to the foregoing embodiments, it should be understood that modifications, equivalents, improvements and modifications to the technical solution described in the foregoing embodiments may occur to those skilled in the art, and all modifications, equivalents, and improvements are intended to be included within the spirit and principle of the present invention.
Claims (10)
1. The joint device of the lining nonmetallic composite steel pipe with the double sealing structure is characterized by comprising two steel flanges, a corrosion-resistant alloy compression ring, a sealing gasket and a fixing part, wherein the two steel flanges are respectively connected with the steel base pipe ends of the two lining nonmetallic composite steel pipes;
The two steel flanges are oppositely arranged, first grooves are respectively formed in the middle parts of sealing surfaces of the two steel flanges, the two steel flanges are fixed by the fixing part through bolt holes on the outer edges of the two steel flanges, the corrosion-resistant alloy compression ring is arranged in the first grooves, and the sealing gasket is arranged between the two steel flanges and is positioned at the inner edges of the two steel flanges.
2. The joint device of a composite steel pipe with a double-seal lining according to claim 1, wherein the composite steel pipe with a non-metal lining is further provided with a non-metal lining pipe inserted into the steel base pipe, a non-metal lining pipe with a preset length is reserved at the pipe end of the composite steel pipe with a non-metal lining, and the non-metal lining pipe with a preset length is turned to form a non-metal covering layer covering the sealing surface of the corresponding steel flange.
3. The liner non-metal composite steel pipe joint device with double sealing structure according to claim 2, wherein the second groove and the burring step are respectively formed by pressing the non-metal cover layers on the two steel flange sealing surfaces;
Correspondingly, the corrosion-resistant alloy compression ring is arranged in the second groove, and the sealing gasket is arranged at the step of the flanging step.
4. The liner non-metal composite steel pipe joint device with double sealing structure according to claim 2, wherein the non-metal liner pipe is a non-metal pipe made of polyethylene or polypropylene.
5. A lined non-metallic composite steel pipe joint assembly having a double seal structure according to claim 2, wherein said joint assembly further comprises a weld for joining a steel base pipe end and said steel flange.
6. The lined non-metallic composite steel pipe joint device with a double seal structure of claim 1, wherein the steel flange is a necked butt welding flange.
7. The lined non-metal composite steel pipe joint device with a double seal structure according to claim 2, wherein the fixing member comprises a member composed of a bolt and a nut.
8. The liner non-metal composite steel pipe joint device with the double sealing structure according to claim 1, wherein the material of the corrosion-resistant alloy compression ring is determined according to a conveying medium of the liner non-metal composite steel pipe.
9. The non-metal composite steel pipe joint device with double sealing structure lining as claimed in claim 1, wherein the sealing pad is made of polytetrafluoroethylene sealing pad and fluororubber.
10. A method of installing a connector device according to any one of claims 1 to 9, the method comprising:
placing the corrosion-resistant alloy compression ring in the first groove, and arranging the sealing gasket between the two steel flanges and at the inner edge of the steel flanges;
Aligning two steel flanges respectively connected with the steel base pipe ends in the two lining nonmetallic composite steel pipes;
Fastening the two steel flanges by a fixing part;
the two steel flanges are arranged oppositely, first grooves are respectively formed in the middle parts of sealing surfaces of the two steel flanges, and the corrosion-resistant alloy compression ring is arranged in the first grooves.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311133129.5A CN119554492A (en) | 2023-09-04 | 2023-09-04 | A lined non-metallic composite steel pipe joint device with double sealing structure |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311133129.5A CN119554492A (en) | 2023-09-04 | 2023-09-04 | A lined non-metallic composite steel pipe joint device with double sealing structure |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN119554492A true CN119554492A (en) | 2025-03-04 |
Family
ID=94765426
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202311133129.5A Pending CN119554492A (en) | 2023-09-04 | 2023-09-04 | A lined non-metallic composite steel pipe joint device with double sealing structure |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN119554492A (en) |
Citations (10)
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|---|---|---|---|---|
| CN2210994Y (en) * | 1994-11-24 | 1995-10-25 | 李星 | Jointing device for pipeline flange turned-out rim |
| JP3141837U (en) * | 2008-03-07 | 2008-05-22 | ノーラエンジニアリング株式会社 | Loose flange fitting |
| CN203115345U (en) * | 2013-01-21 | 2013-08-07 | 章明伟 | Connecting sealing device between steel-plastic composite steel tube with flange and flange pipe or flange pipe fitting |
| CN104791580A (en) * | 2015-05-07 | 2015-07-22 | 山东柯林瑞尔管道工程有限公司 | Pipeline lined with anti-corrosion plastic pipe |
| CN204785307U (en) * | 2015-05-07 | 2015-11-18 | 山东柯林瑞尔管道工程有限公司 | Anticorrosive plastic tubing pipeline of inside lining |
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| JP2016089970A (en) * | 2014-11-06 | 2016-05-23 | ノーラエンジニアリング株式会社 | Loose flange fitting |
| CN206708600U (en) * | 2017-03-07 | 2017-12-05 | 河南中拓石油工程技术股份有限公司 | A kind of outer fixed ring type HDPE Flange attachment means |
| CN213452170U (en) * | 2020-11-11 | 2021-06-15 | 成都中远管道有限公司 | Butt welding structure of composite steel pipe flange seal end face |
| CN216952102U (en) * | 2022-01-25 | 2022-07-12 | 临海伟星新型建材有限公司 | Double-sealing connection structure for lining pipe |
-
2023
- 2023-09-04 CN CN202311133129.5A patent/CN119554492A/en active Pending
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|---|---|---|---|---|
| CN2210994Y (en) * | 1994-11-24 | 1995-10-25 | 李星 | Jointing device for pipeline flange turned-out rim |
| JP3141837U (en) * | 2008-03-07 | 2008-05-22 | ノーラエンジニアリング株式会社 | Loose flange fitting |
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| JP2016089970A (en) * | 2014-11-06 | 2016-05-23 | ノーラエンジニアリング株式会社 | Loose flange fitting |
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| CN204785307U (en) * | 2015-05-07 | 2015-11-18 | 山东柯林瑞尔管道工程有限公司 | Anticorrosive plastic tubing pipeline of inside lining |
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| CN213452170U (en) * | 2020-11-11 | 2021-06-15 | 成都中远管道有限公司 | Butt welding structure of composite steel pipe flange seal end face |
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