CN112555530A - High-pressure-resistant polyamide pipeline for gas - Google Patents
High-pressure-resistant polyamide pipeline for gas Download PDFInfo
- Publication number
- CN112555530A CN112555530A CN202011576072.2A CN202011576072A CN112555530A CN 112555530 A CN112555530 A CN 112555530A CN 202011576072 A CN202011576072 A CN 202011576072A CN 112555530 A CN112555530 A CN 112555530A
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- China
- Prior art keywords
- pipeline
- connecting piece
- resistant polyamide
- high pressure
- pressure resistant
- 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.)
- Pending
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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
- F16L23/024—Flanged joints the flanges being connected by members tensioned axially characterised by how the flanges are joined to, or form an extension of, the pipes
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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
- F16L21/00—Joints with sleeve or socket
- F16L21/06—Joints with sleeve or socket with a divided sleeve or ring clamping around the pipe-ends
- F16L21/065—Joints with sleeve or socket with a divided sleeve or ring clamping around the pipe-ends tightened by tangentially-arranged threaded pins
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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
- F16L57/00—Protection of pipes or objects of similar shape against external or internal damage or wear
- F16L57/02—Protection of pipes or objects of similar shape against external or internal damage or wear against cracking or buckling
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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
- F16L58/02—Protection of pipes or pipe fittings against corrosion or incrustation by means of internal or external coatings
- F16L58/04—Coatings characterised by the materials used
- F16L58/10—Coatings characterised by the materials used by rubber or plastics
- F16L58/1054—Coatings characterised by the materials used by rubber or plastics the coating being placed outside the pipe
Landscapes
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Rigid Pipes And Flexible Pipes (AREA)
Abstract
A high-pressure-resistant polyamide pipeline for fuel gas comprises a first pipeline, wherein a second pipeline is arranged on one side of the first pipeline, limit blocks are arranged on the first pipeline and the second pipeline respectively, fixing seats are arranged on the first pipeline and the second pipeline respectively and correspond to the two fixing seats, mounting holes are formed in two sides of each fixing seat, a first bolt is arranged in each mounting hole and penetrates through each mounting hole, a nut matched with the first bolt is mounted at the tail end of each first bolt, a mounting groove is formed in the joint of the first pipeline, a clamping ring is arranged at the joint of the second pipeline and is mounted in each mounting groove, the two fixing seats are sleeved on the first pipeline and the second pipeline respectively through a through hole, so that the limit blocks on the slide way can avoid sliding off the fixing seats, one sides of the two fixing seats are in contact with each other and penetrate through the mounting holes through the first bolts, and then the first pipeline and the second pipeline are connected and fixed by nuts, so that the connection between the first pipeline and the second pipeline is firmer.
Description
Technical Field
The invention relates to the technical field of gas pipelines, in particular to a high-pressure-resistant polyamide PA12 pipeline for gas.
Background
The gas pipe is a special pipeline for conveying combustible gas, the gas pipe needs to have the characteristics of convenience in installation, reliability in connection, corrosion resistance, no gas blockage, long service life, no gas blockage and the like, in the process of constantly speeding up the urbanization process, the construction of basic engineering plays a vital role, the laying and installation of the pipeline are particularly prominent, the laying of the pipeline is usually in a direct-buried mode at present, and the gas pipeline is formed by splicing a plurality of pipelines.
For example, the publication number "cn201920433094. x" patent name: "a anticorrosive gas pipeline of high weatherability" patent discloses "including first gas pipeline and second gas pipeline, its characterized in that: fixed screw has been seted up to pipe connection mouth department on the first gas pipeline, and fixed screw passes through fixing bolt and makes first gas pipeline and second gas pipeline fixed connection, install fixing device on the first gas pipeline, the welding of mouth of pipe department of second gas pipeline has one section to connect the stand pipe, connect the seamless cooperation of mouth of pipe on stand pipe and the first gas pipeline, fixing device includes locating piece, lifting screw, mount, rubber pad, and fixing device's the outside is the metal ring form, the locating piece welding is at fixing device's top, the screw hole position of seting up on locating piece and the fixing device is the same, and the spiro union has lifting screw in the screw hole, the mount is installed to lifting screw's one end, the inboard fixed mounting in fixing device's bottom has the rubber pad ".
However, when the conventional high-pressure-resistant polyamide PA12 pipeline for gas is used, particularly at the connecting part between the pipeline and the pipeline, the phenomenon of loose connection is easy to occur, so that the service life of the gas pipeline is influenced, and the practicability is not sufficient.
Disclosure of Invention
Aiming at the defects of the prior art, the invention provides the high-pressure-resistant polyamide PA12 pipeline for the fuel gas, which has strong practicability and good connection performance.
In order to achieve the purpose, the invention provides the following technical scheme:
the high-pressure-resistant polyamide PA12 pipeline for the gas comprises a first pipeline, wherein a second pipeline is arranged on one side of the first pipeline, limit blocks are arranged on the first pipeline and the second pipeline respectively, fixing seats are arranged on the first pipeline and the second pipeline respectively and correspond to each other, mounting holes are formed in two sides of each fixing seat, a first bolt is arranged in each mounting hole and penetrates through each mounting hole, a matched nut is mounted at the tail end of each first bolt, a mounting groove is formed in the joint of the first pipeline, a clamping ring is arranged at the joint of the second pipeline and is mounted inside each mounting groove, a first connecting piece and a second connecting piece are arranged at the joint of the first pipeline and the second pipeline, a sealing ring is arranged in each first connecting piece, through holes are formed in two sides of each first connecting piece, and a second bolt is arranged in each through hole, be provided with the draw-in groove on the first connecting piece, second connecting piece both ends are provided with the screw hole, be provided with the fixture block on the second connecting piece, first pipeline has set gradually the sun-proof layer by outer to interior, be provided with the anticorrosive coating in the sun-proof layer, be provided with the enhancement layer in the anticorrosive coating, the inside inner tube that is provided with of enhancement layer.
In order to improve the firmness between the pipelines, the invention improves that the fixed seat is provided with a through hole, the size of the through hole is the same as that of the first pipeline and the second pipeline, and the fixed seat is movably connected with the first pipeline and the second pipeline.
In order to realize better connection, the invention improves that the limiting blocks arranged on the first pipeline and the second pipeline are integrally arranged with the first pipeline and the second pipeline.
In order to enable the connection between the pipelines to be more stable, the invention improves that two sides of one end of the first pipeline are provided with guide blocks, grooves are arranged inside two sides of one end of the second pipeline, the guide blocks are matched with the grooves, and the guide blocks are arranged inside the grooves.
In order to realize the convenience of the connecting piece, the invention improves the structure that the clamping block is T-shaped and is matched with the clamping groove.
In order to improve the protection effect of the pipeline, the invention improves that the surfaces of the first pipeline and the second pipeline are both provided with a sun-proof layer, and the sun-proof layers are sun-proof paints.
In order to realize the anti-corrosion effect of the pipeline, the invention has the improvement that the anti-corrosion layer is made of epoxy resin.
In order to improve the toughness of the pipeline, the invention improves that a plurality of thin steel wires are arranged in the reinforcing layer and are staggered to form a net structure.
Compared with the prior art, the invention provides the high-pressure-resistant polyamide PA12 pipeline for fuel gas, which has the following beneficial effects:
this high pressure resistant polyamide PA12 pipeline for gas, when using, with two fixing bases respectively through the perforation cover on first pipeline and second pipeline, make fixing base slide stopper department, the fixing base landing can be avoided to the stopper, one side of two fixing bases contacts to pass the mounting hole through first bolt, the reuse nut is connected fixedly, makes the connection between first pipeline and the second pipeline more firm.
Drawings
FIG. 1 is a schematic structural view of the present invention;
FIG. 2 is an enlarged view of the internal connection of FIG. 1 according to the present invention;
FIG. 3 is an enlarged side view at 8 of FIG. 1;
FIG. 4 is a schematic side view of FIG. 1 at 3 according to the present invention;
FIG. 5 is a schematic view of the internal structure of FIG. 1 according to the present invention;
FIG. 6 is an enlarged view at 22 of FIG. 5 in accordance with the present invention;
in the figure: 1. a first conduit; 2. a second conduit; 3. a fixed seat; 4. mounting holes; 5. a first bolt; 6. a nut; 7. a first connecting member; 8. a limiting block; 9. a snap ring; 10. a groove; 11. mounting grooves; 12. a guide block; 13. a second connecting member; 14. a through hole; 15. a card slot; 16. a second bolt; 17. A clamping block; 18. a threaded hole; 19. a seal ring; 20. a sunscreen layer; 21. an anticorrosive layer; 22. a reinforcing layer; 23. an inner tube; 24. perforating; 25. thin steel wires.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Referring to fig. 1-6, the high pressure resistant polyamide PA12 pipeline for fuel gas comprises a first pipeline 1, a second pipeline 2 is arranged on one side of the first pipeline 1, a limiting block 8 is arranged on each of the first pipeline 1 and the second pipeline 2, a fixing seat 3 is arranged on each of the first pipeline 1 and the second pipeline 2, the two fixing seats 3 correspond to each other, mounting holes 4 are arranged on two sides of each fixing seat 3, a first bolt 5 is arranged in each mounting hole 4, the first bolt 5 penetrates through each mounting hole 4, a nut 6 matched with the first bolt 5 is arranged at the tail end of each first bolt 5, a mounting groove 11 is arranged at the joint of the first pipeline 1, a clamping ring 9 is arranged at the joint of the second pipeline 2, the clamping ring 9 is arranged in each mounting groove 11, a first connecting piece 7 and a second connecting piece 13 are arranged at the joint of the first pipeline 1 and the second pipeline 2, a sealing ring 19 is arranged in each first connecting piece, through holes 14 are formed in two sides of the first connecting piece 7, second bolts 16 are arranged in the through holes 14, a clamping groove 15 is formed in the first connecting piece 7, threaded holes 18 are formed in two ends of the second connecting piece 13, clamping blocks 17 are arranged on the second connecting piece 13, a sun-proof layer 20 is sequentially arranged from outside to inside of the first pipeline 1, an anti-corrosion layer 21 is arranged in the sun-proof layer 20, a reinforcing layer 22 is arranged in the anti-corrosion layer 21, and an inner pipe 23 is arranged inside the reinforcing layer 22.
In order to improve the firmness between the pipelines, the invention improves that the fixed seat 3 is provided with a through hole 24, the size of the through hole 24 is the same as that of the first pipeline 1 and the second pipeline 2, and the fixed seat 3 is movably connected with the first pipeline 1 and the second pipeline 2.
In order to realize better connection, the invention improves that the limiting blocks 8 arranged on the first pipeline 1 and the second pipeline 2 are integrated with the first pipeline and the second pipeline.
In order to make the connection between the pipelines more stable, the invention improves that two sides of one end of the first pipeline 1 are provided with guide blocks 12, two sides of one end of the second pipeline 2 are internally provided with grooves 10, the guide blocks 12 are matched with the grooves 10, and the guide blocks 12 are arranged inside the grooves 10.
In order to realize the convenience of the connecting piece, the invention improves that the fixture block 17 is in a T shape, and the fixture block 17 is matched with the clamping groove 15.
In order to improve the protection effect of the pipeline, the invention improves that the surfaces of the first pipeline 1 and the second pipeline 2 are both provided with a sun protection layer 20, and the sun protection layer 20 is a sun protection paint.
In order to realize the anti-corrosion effect of the pipeline, the invention has the improvement that the anti-corrosion layer 21 is made of epoxy resin.
In order to improve the toughness of the pipeline, the invention improves that a plurality of thin steel wires 25 are arranged in the reinforcing layer 22, and the thin steel wires 25 are staggered to form a net structure.
In summary, the working principle and working process of the high pressure resistant polyamide PA12 pipeline for fuel gas are that, when in use, two fixing bases 3 are respectively sleeved on a first pipeline 1 and a second pipeline 2 through a through hole 24, so that the fixing bases 3 slide on a limiting block 8, the limiting block 8 can prevent the fixing bases 3 from sliding off, one sides of the two fixing bases 3 are contacted, pass through a mounting hole 4 through a first bolt 5, and are connected and fixed through a nut 6, so that the connection between the first pipeline 1 and the second pipeline 2 is firmer, when in connection, a snap ring 9 on one side of the second pipeline 2 is clamped into a mounting groove 11 in the second pipeline 2, and guide blocks 12 on two sides of the first pipeline 1 are inserted into a groove 10, so that the connection between the first pipeline 1 and the second pipeline 2 is tighter, a first connecting piece 7 and a second connecting piece 13 are arranged at the connection, and the second connecting piece 13 slides into a clamping groove 15 of the first connecting piece 7 through a T-shaped clamping block 17, the first connecting piece 7 and the second connecting piece 13 are sleeved at the joint of the second pipeline 2 and the second pipeline 2, the second bolt 16 penetrates through the through hole 14 of the first connecting piece 7 and is screwed into the threaded hole 18 of the second connecting piece 13, the first connecting piece 7 and the second connecting piece 13 are connected and fixed, the sealing ring 19 arranged on the inner wall of the first connecting piece 7 can improve the sealing effect of the joint and prevent gas from leaking, the structures inside the first pipeline 1 and the second pipeline 2 are the same, the sun-proof layer 20 arranged on the surface of the first pipeline 1 is a sun-proof coating agent and is uniformly coated on the pipe wall, the sun-proof layer 20 can prevent the pipe wall from being exposed to sunlight to crack, the anti-corrosion layer 21 is made of epoxy resin, the first pipeline 1 can be effectively prevented from being corroded, the service life of the reinforcing layer 22 is prevented from being influenced by a plurality of thin steel wires 25, the crisscross network structure that is of fine steel mesh has improved the toughness of high pressure resistant polyamide PA12 pipeline for the gas, avoids the pipeline to appear buckling or fracture, improves practicality and installation nature.
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (8)
1. A high pressure resistant polyamide pipeline for fuel gas is characterized in that: comprises a first pipeline (1), a second pipeline (2) is arranged on one side of the first pipeline (1), limit blocks (8) are arranged on the first pipeline (1) and the second pipeline (2), fixing seats (3) are arranged on the first pipeline (1) and the second pipeline (2), the two fixing seats (3) correspond to each other, mounting holes (4) are arranged on two sides of each fixing seat (3), first bolts (5) are arranged in the mounting holes (4), the first bolts (5) penetrate through the mounting holes (4), nuts (6) which are matched with each other are arranged at the tail ends of the first bolts (5), a mounting groove (11) is arranged at the joint of the first pipeline (1), a clamping ring (9) is arranged at the joint of the second pipeline (2), the clamping ring (9) is arranged in the mounting groove (11), a first connecting piece (7) and a second connecting piece (13) are arranged at the joint of the first pipeline (1) and the second pipeline (2), be provided with sealing washer (19) in first connecting piece (7), first connecting piece (7) both sides are provided with through-hole (14), be provided with second bolt (16) in through-hole (14), be provided with draw-in groove (15) on first connecting piece (7), second connecting piece (13) both ends are provided with screw hole (18), be provided with fixture block (17) on second connecting piece (13), first pipeline (1) has set gradually sun-proof layer (20) by outer to interior, be provided with anticorrosive coating (21) in sun-proof layer (20), be provided with enhancement layer (22) in anticorrosive coating (21), inside inner tube (23) that is provided with of enhancement layer (22).
2. The high pressure resistant polyamide pipe for gas use according to claim 1, characterized in that: be provided with on fixing base (3) perforation (24), perforation (24) are the same with first pipeline (1) and second pipeline (2) size, fixing base (3) and first pipeline (1) and second pipeline (2) swing joint.
3. The high pressure resistant polyamide pipe for gas use according to claim 1, characterized in that: the limiting blocks (8) arranged on the first pipeline (1) and the second pipeline (2) are integrally arranged with the first pipeline and the second pipeline.
4. The high pressure resistant polyamide pipe for gas use according to claim 1, characterized in that: the pipeline structure is characterized in that guide blocks (12) are arranged on two sides of one end of the first pipeline (1), grooves (10) are formed in two sides of one end of the second pipeline (2), the guide blocks (12) are matched with the grooves (10), and the guide blocks (12) are arranged in the grooves (10).
5. The high pressure resistant polyamide pipe for gas use according to claim 1, characterized in that: the improved structure of the invention is characterized in that the clamping block (17) is T-shaped, and the clamping block (17) is matched with the clamping groove (15).
6. The high pressure resistant polyamide pipe for gas use according to claim 1, characterized in that: the surfaces of the first pipeline (1) and the second pipeline (2) are both provided with a sun-screening layer (20), and the sun-screening layer (20) is a sun-screening paint.
7. The high pressure resistant polyamide pipe for gas use according to claim 1, characterized in that: the anticorrosive layer (21) is made of epoxy resin.
8. The high pressure resistant polyamide pipe for gas use according to claim 1, characterized in that: thin steel wires (25) are arranged in the reinforcing layer (22), and the thin steel wires (25) are a plurality and are staggered to form a net structure.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011576072.2A CN112555530A (en) | 2020-12-28 | 2020-12-28 | High-pressure-resistant polyamide pipeline for gas |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011576072.2A CN112555530A (en) | 2020-12-28 | 2020-12-28 | High-pressure-resistant polyamide pipeline for gas |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN112555530A true CN112555530A (en) | 2021-03-26 |
Family
ID=75033608
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202011576072.2A Pending CN112555530A (en) | 2020-12-28 | 2020-12-28 | High-pressure-resistant polyamide pipeline for gas |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN112555530A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114654815A (en) * | 2022-03-11 | 2022-06-24 | 延安守山机械制造有限公司 | Corrosion-resistant oil casing pipe and preparation method thereof |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH08210570A (en) * | 1995-01-31 | 1996-08-20 | Nippon Kokan Pipe Fittings Mfg Co Ltd | Pipe joint |
| DE202007003109U1 (en) * | 2007-03-02 | 2008-07-10 | Reinert-Ritz Gmbh | flange |
| CN202327425U (en) * | 2011-11-12 | 2012-07-11 | 福建恒杰塑业新材料有限公司 | Connector device for pipeline connection |
| CN206918444U (en) * | 2017-05-10 | 2018-01-23 | 江西省得一康管业有限公司 | A kind of PVC composite plastic pipes |
| CN208750195U (en) * | 2018-07-16 | 2019-04-16 | 四川中航超高分子量管业有限公司 | A kind of ultra high molecular polyethylene steel skeleton composite |
| CN209705486U (en) * | 2019-04-02 | 2019-11-29 | 陈恒 | A kind of anti-corrosion gas pipeline of high-weatherability |
| CN210687427U (en) * | 2019-10-28 | 2020-06-05 | 安吉金朋管业有限公司 | HDPE reinforcing pipe for sewage discharge |
-
2020
- 2020-12-28 CN CN202011576072.2A patent/CN112555530A/en active Pending
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH08210570A (en) * | 1995-01-31 | 1996-08-20 | Nippon Kokan Pipe Fittings Mfg Co Ltd | Pipe joint |
| DE202007003109U1 (en) * | 2007-03-02 | 2008-07-10 | Reinert-Ritz Gmbh | flange |
| CN202327425U (en) * | 2011-11-12 | 2012-07-11 | 福建恒杰塑业新材料有限公司 | Connector device for pipeline connection |
| CN206918444U (en) * | 2017-05-10 | 2018-01-23 | 江西省得一康管业有限公司 | A kind of PVC composite plastic pipes |
| CN208750195U (en) * | 2018-07-16 | 2019-04-16 | 四川中航超高分子量管业有限公司 | A kind of ultra high molecular polyethylene steel skeleton composite |
| CN209705486U (en) * | 2019-04-02 | 2019-11-29 | 陈恒 | A kind of anti-corrosion gas pipeline of high-weatherability |
| CN210687427U (en) * | 2019-10-28 | 2020-06-05 | 安吉金朋管业有限公司 | HDPE reinforcing pipe for sewage discharge |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114654815A (en) * | 2022-03-11 | 2022-06-24 | 延安守山机械制造有限公司 | Corrosion-resistant oil casing pipe and preparation method thereof |
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Application publication date: 20210326 |
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