CN212616847U - Corrosion-resistant connecting joint for oil and gas conveying non-metallic pipeline - Google Patents
Corrosion-resistant connecting joint for oil and gas conveying non-metallic pipeline Download PDFInfo
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- CN212616847U CN212616847U CN202022203850.5U CN202022203850U CN212616847U CN 212616847 U CN212616847 U CN 212616847U CN 202022203850 U CN202022203850 U CN 202022203850U CN 212616847 U CN212616847 U CN 212616847U
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Abstract
The utility model relates to an oil gas transmission pipeline technical field provides an oil gas transmission is corrosion-resistant attach fitting and connection method for non-metallic pipeline, attach fitting is made by bimetal metallurgy composite pipe and forms, including CRA build-up welding, steel parent tube, CRA inner coating, draw-in groove, steel coupling, steel cutting ferrule. In practical application, the non-metal pipe is nested between the steel base pipe and the steel clamping sleeve, so that the non-metal pipe is firmly connected with the connecting joint; and the steel base pipe is connected with the steel coupling through threads, so that the two nonmetal pipelines are connected. The CRA inner coating of the joint inner wall and the CRA weld overlay at both ends significantly improve the corrosion resistance. The utility model discloses simple structure, easily equipment, convenient operation can effectively connect non-metallic pipeline, and effectively improves the corrosion resisting property who connects the internal surface, prolongs the life who connects greatly, reduces the manufacturing cost who connects by a wide margin.
Description
Technical Field
The utility model relates to an oil gas transmission pipeline technical field, in particular to non-metallic pipeline of oil gas transmission is with corrosion-resistant attach fitting.
Background
Steel pipelines are one of the main ways of oil and gas transportation. However, in recent years, as the development environment of oil and gas is more and more severe, the corrosion damage of oil and gas produced liquid to steel pipelines is more and more frequent, which not only causes the waste of oil and gas resources, but also causes the damage of ecological environment and threatens the public safety of society. Therefore, corrosion control of oil and gas transmission pipelines is a long-term challenge in the industry.
The non-metal pipeline has excellent corrosion resistance and is widely applied to the fields of oil gas gathering and transportation and sewage transportation. However, in view of strength issues, most non-metallic pipes still employ metal joint joints, making metal joint joints a high risk zone in the service of non-metallic pipes, and joint failure also becomes the primary form of non-metallic pipe failure. Particularly, in oil and gas transmission media with strong corrosiveness (such as high-sulfur hydrogen sulfide, carbon dioxide and the like), the probability of corrosion failure of the metal joint is high.
At present, the corrosion resistance of the metal joint mainly adopts two modes of an organic coating and a corrosion resistant alloy. However, from the view of the anticorrosion effect, the organic coating is easy to crack and fall off in the connection process, so that the anticorrosion effect is poor, the anticorrosion effect of the corrosion-resistant alloy is good, and the economic cost is greatly improved (the cost of the corrosion-resistant alloy joint is 5-10 times that of the steel joint).
SUMMERY OF THE UTILITY MODEL
The utility model aims at solving the not enough of prior art, provide a non-metallic pipeline of oil gas delivery is with corrosion-resistant attach fitting, can improve the corrosion resisting property that the steel connects, and can guarantee sufficient economic nature.
The utility model adopts the following technical scheme:
a Corrosion-resistant connecting joint for a non-metal oil and gas conveying pipeline comprises a CRA (Corrosion-resistant alloy) surfacing, a steel base pipe, a CRA inner coating layer, a connecting clamping groove and a steel coupling;
the CRA inner coating is arranged on the inner wall of the steel base pipe, the CRA surfacing is arranged at two ends of the steel base pipe, and the CRA surfacing is used for plugging the end faces of the steel base pipe and the CRA inner coating;
the inner surface of the steel coupling is provided with a first thread, and the outer side of one end of the steel base pipe is provided with a second thread corresponding to the first thread; the adjacent steel base pipes are connected through the steel coupling;
the connecting clamping groove is arranged on the outer side of the steel base pipe and used for connecting the non-metal pipeline and the connecting joint.
Furthermore, the CRA surfacing comprises a first surfacing arranged at one end of a second thread of the steel base pipe and a second surfacing arranged at the other end, a sealing groove is arranged on the first surfacing, and a sealing washer is arranged in the sealing groove; the adjacent steel base pipes are connected in a sealing mode through sealing gaskets.
Further, the connector still includes the steel cutting ferrule, the steel cutting ferrule with pass through between the steel parent tube connect the draw-in groove joint, nested non-metallic pipe between steel cutting ferrule and the steel parent tube realizes non-metallic pipe with the firm connection of steel parent tube.
Furthermore, the material of the CRA inner coating layer is stainless steel or nickel-based alloy.
Further, the stainless steel is 316L or 2205, and the nickel-based alloy is 625 or 825.
Furthermore, the outer diameter of the steel base pipe is 88.9-273 mm, and the thickness of the CRA inner coating layer is 0.5-3 mm.
Further, the longitudinal length of the first surfacing and the second surfacing is 5-10 mm.
A method of joining non-metallic oil and gas conveying pipes using the above-described joint, the method comprising:
s1, 2 connecting joints are connected: the connecting joints are installed at the ends of 2 to-be-connected nonmetal pipes, 1 steel coupling is shared by the 2 connecting joints, a sealing washer is placed in the sealing groove, the steel coupling is rotated, and the 2 connecting joints are hermetically connected under the matching action of the first threads and the second threads;
s2, connecting the connecting joint with the nonmetal pipeline: the steel cutting sleeve and the steel base pipe are clamped through a connecting clamping groove, and a non-metal pipeline is embedded between the steel cutting sleeve and the steel base pipe to realize firm connection between the non-metal pipe and the steel base pipe;
wherein, the steps S1 and S2 have no sequence.
The utility model has the advantages that:
the utility model discloses a coupling joint's cutting ferrule formula project organization makes to connect firmly continuous with non-metallic pipe, and a pair of joint passes through the screw thread and links to each other with the steel coupling for two sections non-metallic pipe are connected, and the seal ring in the middle of the butt joint can effectively improve the leakproofness that connects. In addition, the positions of the inner surface of the joint, which are contacted with the conveyed fluid, are all corrosion-resistant CRA inner coating layers, so that the joint is ensured to have excellent corrosion resistance.
The utility model discloses simple structure, easily equipment, convenient operation can effectively connect non-metallic pipeline, and effectively improves the corrosion resisting property who connects the internal surface, prolongs the life who connects greatly. In addition, compared with the joint processed by the corrosion-resistant alloy, the bimetal metallurgy composite pipe structure greatly reduces the manufacturing cost of the joint while ensuring the mechanical property and the corrosion resistance.
Drawings
Fig. 1 is the utility model discloses the embodiment of a corrosion-resistant attach fitting for non-metallic pipeline of oil gas transmission's structural schematic diagram.
Fig. 2 is a schematic view showing a connection relationship of the connection joint in the embodiment in actual use.
Wherein: 1-first surfacing; 2-a steel base pipe; 3-CRA inner coating layer; 4-second surfacing welding; 5-connecting the clamping groove; 6-second thread; 7-sealing groove; 8-steel coupling; 9-a sealing gasket; 10-steel cutting ferrule; 11-non-metallic pipe.
Detailed Description
Specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings. It should be noted that technical features or combinations of technical features described in the following embodiments should not be considered as being isolated, and they may be combined with each other to achieve better technical effects.
As shown in fig. 1, the corrosion-resistant connecting joint for the oil-gas conveying non-metal pipeline according to the embodiment of the invention comprises a CRA surfacing, a steel base pipe 2, a CRA inner coating 3, a connecting clamping groove 5 and a steel coupling 8; the CRA inner coating is arranged on the inner wall of the steel base pipe 2, and preferably the CRA inner coating and the steel base pipe are compounded together through hot rolling; the CRA surfacing welding is arranged at two ends of the steel base pipe 2 and used for plugging the end faces of the steel base pipe 2 and the CRA inner coating 3; a first thread (not shown) is arranged on the inner surface of the steel coupling 8, and a second thread 6 corresponding to the first thread is arranged on the outer side of one end of the steel base pipe 2; the adjacent steel base pipes 2 are connected through the steel coupling 8; the connecting clamping groove 5 is arranged on the outer side of the steel base pipe 2 and used for connecting the non-metal pipeline 11 with the connecting joint.
Preferably, the CRA overlay welding comprises a first overlay welding 1 arranged at one end of a second thread 6 of the steel base pipe 2 and a second overlay welding 4 arranged at the other end, a sealing groove 7 is arranged on the first overlay welding 1, and a sealing washer 9 is arranged in the sealing groove 7; the adjacent steel base tubes 2 are sealingly connected by means of a sealing gasket 9.
Further preferably, the bimetal metallurgy composite pipe is composed of a steel base pipe 2 and a CRA inner coating 3, the steel base pipe 2 and the CRA inner coating 3 are in a metallurgical bonding state, the steel base pipe 2 and the CRA inner coating 3 can be selected according to actual working conditions, the outer diameter of the steel base pipe 2 can be 88.9-273 mm, and the thickness of the CRA inner coating 3 can be 0.5-3 mm.
The CRA surfacing welding 1 and 4 are characterized in that CRA layers are welded at two ends of the bimetal metallurgy composite pipe through a welding process, the length of each CRA layer is about 5-10 mm along the longitudinal direction, and the CRA surfacing welding is used for plugging the end face of the bimetal metallurgy composite pipe and improving the corrosion resistance; the CRA may be stainless steel (e.g., 316L, 2205) or nickel-based alloy (e.g., 625, 825), and is selected according to the degree of corrosion under actual conditions.
The connecting clamping groove 5 is formed on the steel base pipe 2 in a processing mode, and aims to realize the connection of the connecting joint and the nonmetal pipeline 11.
The second thread 6 is formed by processing the first surfacing welding 1 and the steel base pipe 2 and is used for connecting with a connecting joint of another nonmetal pipeline.
The sealing groove 7 is formed on the first stack welding 1 in a machining mode, and is used for placing a sealing gasket to improve sealing performance when the sealing groove is connected with a connecting joint of another non-metal pipeline.
As shown in fig. 2, in practical application, the connection method of 2 non-metal pipes specifically includes:
s1, 2 connecting joints are connected: the connecting joints are installed at the ends of 2 to-be-connected nonmetal pipes, 1 steel coupling is shared by the 2 connecting joints, a sealing washer is placed in the sealing groove, the steel coupling is rotated, and the 2 connecting joints are hermetically connected under the matching action of the first threads and the second threads;
s2, connecting the connecting joint with the nonmetal pipeline: through the connecting clamping groove joint between steel cutting ferrule and the steel parent tube, nested non-metallic pipe between steel cutting ferrule and the steel parent tube realizes non-metallic pipe with firm connection between the steel parent tube.
The utility model has simple structure, easy assembly and convenient operation, can effectively connect the non-metal pipeline, effectively improves the corrosion resistance of the inner surface of the joint and greatly prolongs the service life of the joint; in addition, compared with the joint processed by the corrosion-resistant alloy, the bimetal metallurgy composite pipe structure greatly reduces the manufacturing cost of the joint while ensuring the mechanical property and the corrosion resistance.
While several embodiments of the present invention have been presented herein, it will be appreciated by those skilled in the art that changes can be made to the embodiments herein without departing from the spirit of the invention. The above-described embodiments are merely exemplary and should not be taken as limiting the scope of the invention.
Claims (8)
1. The corrosion-resistant connecting joint for the oil and gas conveying non-metal pipeline is characterized by comprising a CRA (crack-containing building welding), a steel base pipe, a CRA inner coating layer, a connecting clamping groove and a steel coupling;
the CRA inner coating is arranged on the inner wall of the steel base pipe, the CRA surfacing is arranged at two ends of the steel base pipe, and the CRA surfacing is used for plugging the end faces of the steel base pipe and the CRA inner coating;
the inner surface of the steel coupling is provided with a first thread, and the outer side of one end of the steel base pipe is provided with a second thread corresponding to the first thread; the adjacent steel base pipes are connected through the steel coupling;
the connecting clamping groove is arranged on the outer side of the steel base pipe and used for connecting the non-metal pipeline and the connecting joint.
2. The corrosion-resistant connecting joint for the non-metallic oil and gas conveying pipeline according to claim 1, wherein the CRA overlay welding comprises a first overlay welding arranged at one end of a second thread of the steel base pipe and a second overlay welding arranged at the other end of the second thread, a sealing groove is formed in the first overlay welding, and a sealing gasket is arranged in the sealing groove; the adjacent steel base pipes are connected in a sealing mode through sealing gaskets.
3. The corrosion-resistant joint connection for the non-metal oil and gas conveying pipeline of claim 2, wherein the joint connection further comprises a steel clamping sleeve, the steel clamping sleeve is clamped with the steel base pipe through the connecting clamping groove, and the non-metal pipeline is nested between the steel clamping sleeve and the steel base pipe so as to realize the firm connection between the non-metal pipe and the steel base pipe.
4. The corrosion resistant joint connection of any one of claims 1 to 3, wherein the CRA inner coating is made of stainless steel or nickel-based alloy.
5. The corrosion resistant joint connection for non-metallic oil and gas transmission pipelines of claim 4, wherein said stainless steel is 316L or 2205 and said nickel-based alloy is 625 or 825.
6. The corrosion-resistant connecting joint for the non-metal oil and gas conveying pipeline as claimed in claim 4, wherein the outer diameter of the steel base pipe is 88.9-273 mm, and the thickness of the CRA inner coating layer is 0.5-3 mm.
7. The corrosion-resistant connecting joint for the oil-gas conveying non-metal pipeline according to claim 2, wherein the longitudinal length of the first surfacing and the second surfacing is 5-10 mm.
8. A non-metallic conduit for oil and gas transportation, characterized in that the ends of the non-metallic conduit use a joint according to any of claims 1-7.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022203850.5U CN212616847U (en) | 2020-09-30 | 2020-09-30 | Corrosion-resistant connecting joint for oil and gas conveying non-metallic pipeline |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022203850.5U CN212616847U (en) | 2020-09-30 | 2020-09-30 | Corrosion-resistant connecting joint for oil and gas conveying non-metallic pipeline |
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| Publication Number | Publication Date |
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| CN212616847U true CN212616847U (en) | 2021-02-26 |
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| CN202022203850.5U Active CN212616847U (en) | 2020-09-30 | 2020-09-30 | Corrosion-resistant connecting joint for oil and gas conveying non-metallic pipeline |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112082014A (en) * | 2020-09-30 | 2020-12-15 | 西安德信成科技有限责任公司 | Corrosion-resistant connecting joint for oil-gas conveying non-metal pipeline and connecting method |
-
2020
- 2020-09-30 CN CN202022203850.5U patent/CN212616847U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112082014A (en) * | 2020-09-30 | 2020-12-15 | 西安德信成科技有限责任公司 | Corrosion-resistant connecting joint for oil-gas conveying non-metal pipeline and connecting method |
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Inventor after: Ma Xiaofeng Inventor before: Ma Xiaofeng Inventor before: Yuan Juntao |
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