CN214404970U - Pipe with unequal wall thickness having internal transition section - Google Patents
Pipe with unequal wall thickness having internal transition section Download PDFInfo
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- CN214404970U CN214404970U CN202120012099.2U CN202120012099U CN214404970U CN 214404970 U CN214404970 U CN 214404970U CN 202120012099 U CN202120012099 U CN 202120012099U CN 214404970 U CN214404970 U CN 214404970U
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- 230000007704 transition Effects 0.000 title claims abstract description 23
- 230000003247 decreasing effect Effects 0.000 claims description 2
- 238000003466 welding Methods 0.000 abstract description 44
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 26
- 239000003345 natural gas Substances 0.000 description 13
- 230000005540 biological transmission Effects 0.000 description 11
- 239000007789 gas Substances 0.000 description 4
- 239000003209 petroleum derivative Substances 0.000 description 3
- 239000003208 petroleum Substances 0.000 description 2
- 230000001737 promoting effect Effects 0.000 description 2
- 230000007423 decrease Effects 0.000 description 1
- 238000003754 machining Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
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Abstract
The utility model belongs to the technical field of oil gas pipeline, concretely relates to wall thickness pipeline that varies with interior changeover portion. The utility model discloses aim at solving the problem that the welding seam department axial stress of two pipelines that the external diameter equals and the internal diameter is unequal is big. The utility model discloses a pipeline with unequal wall thickness and an internal transition section, which comprises a first pipeline and a second pipeline, wherein the outer diameters of the first pipeline and the second pipeline are equal; the second pipeline includes first pipeline section and the second pipeline section that sets gradually along the direction of keeping away from first pipeline, and the internal diameter of first pipeline section equals the internal diameter of first pipeline, and the end that first pipeline section deviates from the second pipeline section welds with the end of first pipeline, and the internal diameter of second pipeline section is less than the internal diameter of first pipeline. The transition of the inner wall of the conveying pipeline at the welding seam is smooth, the thickness change position of the conveying pipeline is far away from the welding seam, the stress concentration at the welding seam is reduced, the fracture at the welding seam due to large stress concentration is avoided, and the safety of a pipeline transportation system is improved.
Description
Technical Field
The embodiment of the utility model provides a relate to oil gas pipeline technical field, especially relate to a wall thickness pipeline that varies with interior changeover portion.
Background
The petroleum and the natural gas are mainly conveyed through the pipeline, the pipeline conveying has the advantages of high conveying efficiency, large conveying capacity, sustainable conveying and the like, and plays an extremely important role in promoting the national economic development.
To meet the design requirements of strength and safety, the wall thickness of the conveying pipeline needs to be changed to adapt to the conditions of regional grade change, road grade change, ground transition, road intersection, road crossing, valve chamber crossing of a road or a gas transmission station and the like. At the position of the wall thickness change, the conveying pipeline comprises a first pipeline and a second pipeline, and the outer diameters of the first pipeline and the second pipeline are equal and the inner diameters of the first pipeline and the second pipeline are different; when connecting, the first pipe and the second pipe are welded, and then a welding seam is formed at the welding position to connect the first pipe and the second pipe.
However, in the related art, the thickness of the transmission pipeline at the welding seam changes, and when the transmission pipeline is stressed, a large axial stress concentration is generated at the welding seam, so that the welding seam is broken and fails, and the transmitted oil or natural gas leaks.
SUMMERY OF THE UTILITY MODEL
In view of this, the embodiment of the present invention provides a pipe with unequal wall thickness and an inner transition section to solve the technical problem of large axial stress at the weld joint of two pipes with equal outer diameters and unequal inner diameters.
The embodiment of the utility model provides a pipeline with unequal wall thickness and an internal transition section, which comprises a first pipeline and a second pipeline welded with the first pipeline, wherein the outer diameters of the first pipeline and the second pipeline are equal, and the central line of the first pipeline is collinear with the central line of the second pipeline; the second pipeline includes first pipeline section and the second pipeline section that sets gradually along the direction of keeping away from first pipeline, and the internal diameter of first pipeline section equals the internal diameter of first pipeline, and the end that first pipeline section deviates from the second pipeline section welds with the end of first pipeline, and the internal diameter of second pipeline section is less than the internal diameter of first pipeline.
In some embodiments, which may include the above embodiments, the second pipeline further includes a third pipe segment having a centerline collinear with the centerlines of the first and second pipe segments, the third pipe segment being disposed between the first and second pipe segments, an inner wall of the third pipe segment being disposed obliquely to the centerline of the third pipe segment, and an inner diameter of the third pipe segment gradually decreasing from the first pipe segment to the second pipe segment.
In some embodiments, which may include the above embodiments, the inner diameter of the third pipe section towards the end of the first pipe section is equal to the inner diameter of the first pipe section, and the inner diameter of the third pipe section away from the end of the first pipe section is equal to the inner diameter of the second pipe section.
In some embodiments, which may include the above embodiments, the inner wall of the third pipe segment is joined to the inner wall of the first pipe segment by a predetermined curved surface, and the inner wall of the third pipe segment is tangent to the predetermined curved surface.
In some embodiments, which may include the above embodiments, the inner wall of the first tube segment is tangent to the predetermined curved surface.
In some embodiments, which may include the above embodiments, the curved surface is a curved surface.
In some embodiments, which may include the foregoing embodiments, in a cross section where the center line of the second pipe is located, a central angle of the arc corresponding to the arc surface is a first angle, an included angle between the third pipe segment and the center line of the second pipe is a second angle, and the first angle and the second angle are equal.
In some embodiments, which may include the above embodiments, in a cross section where the centerline of the second pipeline is located, the length of the sidewall line corresponding to the inner wall of the third pipe segment is smaller than the radius of the arc corresponding to the arc surface.
In some embodiments, which may include the above embodiments, the length of the first tube segment is less than or equal to 100 mm.
In some embodiments, which may include the above embodiments, in a cross-section where the second pipeline center line is located, an included angle between a line of a corresponding side wall of the inner wall of the third pipe section and the second pipeline center line is 14 ° to 30 °.
The embodiment of the utility model provides a wall thickness pipeline that varies with interior changeover portion, first pipeline section deviate from the terminal of second pipeline section and the terminal welding of first pipeline, because the internal diameter of first pipeline section equals with the internal diameter of first pipeline to make the pipeline inner wall transition of welding seam department mild, reduced the stress concentration of welding seam department. The inner diameter of the second pipe section is smaller than that of the first pipe section, and the thickness change position of the conveying pipeline is located between the first pipe section and the second pipe section, so that the thickness change position of the conveying pipeline is far away from the welding line, the stress concentration at the welding line is further reduced, the conveying pipeline is prevented from being broken due to large stress concentration at the welding line, and the safety of an oil or natural gas conveying system is improved.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.
Fig. 1 is a first cross-sectional view of a pipe wall in a pipe with unequal wall thickness and an internal transition section according to an embodiment of the present invention;
fig. 2 is a second cross-sectional view of a pipe wall in a pipe with a different wall thickness and an internal transition section according to an embodiment of the present invention.
Description of reference numerals:
10. a first conduit;
20. a second conduit;
30. welding seams;
201. a first tube section;
202. a second tube section;
203. a third tube section;
204. and presetting a curved surface.
Detailed Description
First of all, it should be understood by those skilled in the art that these embodiments are only for explaining the technical principle of the present invention, and are not intended to limit the scope of the present invention. And can be adjusted as needed by those skilled in the art to suit particular applications.
Next, it should be noted that in the description of the embodiments of the present invention, the terms of direction or positional relationship indicated by the terms "inside", "outside", and the like are based on the directions or positional relationships shown in the drawings, which are merely for convenience of description, and do not indicate or imply that the device or member must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention.
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts belong to the protection scope of the present invention.
The petroleum and the natural gas are mainly conveyed through the pipeline, the pipeline conveying has the advantages of high conveying efficiency, large conveying capacity, sustainable conveying and the like, and plays an extremely important role in promoting the national economic development.
To meet the design requirements of strength and safety, the wall thickness of the conveying pipeline needs to be changed to adapt to the conditions of regional grade change, road grade change, ground transition, road intersection, road crossing, valve chamber crossing of a road or a gas transmission station and the like. At the position of the wall thickness change, the conveying pipeline comprises a first pipeline and a second pipeline, and the outer diameters of the first pipeline and the second pipeline are equal and the inner diameters of the first pipeline and the second pipeline are different; when connecting, the first pipe and the second pipe are welded, and then a welding seam is formed at the welding position to connect the first pipe and the second pipe.
However, in the related art, the thickness of the conveying pipeline at the welding seam changes, and the inner wall of the conveying pipeline at the welding seam presents an obvious non-smooth transition shape, so that when the conveying pipeline is stressed, a large axial stress concentration is generated at the welding seam, and further the welding seam is broken and fails, so that the conveyed oil or natural gas is leaked.
The embodiment provides a wall thickness pipeline that varies with interior changeover portion, keeps away from the welding seam through the thickness change position that makes pipeline, makes the pipeline inner wall transition of welding seam department mild, and then reduces the stress concentration of welding seam department, has avoided pipeline to be in the welding seam department because of great stress concentration breaking occur, has increased oil or natural gas transportation system's security.
As shown in fig. 1 and 2, the present embodiment provides a pipe with unequal wall thickness having an inner transition section, comprising a first pipe 10 and a second pipe 20 welded to the first pipe 10, the first pipe 10 and the second pipe 20 having equal outer diameters, and the centerline of the first pipe 10 and the centerline of the second pipe 20 being collinear.
The second pipeline 20 comprises a first pipe section 201 and a second pipe section 202 which are sequentially arranged along a direction far away from the first pipeline 10, the inner diameter of the first pipe section 201 is equal to that of the first pipeline 10, the end, away from the second pipe section 202, of the first pipe section 201 is welded with the end of the first pipeline 10, the inner diameter of the second pipe section 202 is smaller than that of the first pipeline 10, and the first pipe section 201 and the second pipe section 202 can be of an integral structure.
A first annular gap is formed between the extension surface of the inner wall of the second pipe section 202 and the inner wall of the first pipe section 201, and the first annular gap can be formed by groove machining.
In the pipe with the unequal wall thickness and the internal transition section in the embodiment, the end of the first pipe section 201 away from the second pipe section 202 is welded with the end of the first pipe 10, and the inner diameter of the first pipe section 201 is equal to that of the first pipe 10, so that the transition of the inner wall of the conveying pipe at the welding seam 30 is smooth, and the stress concentration at the welding seam 30 is reduced. The inner diameter of the second pipe section 202 is smaller than that of the first pipe 10, and the position of the pipe wall thickness change of the transmission pipeline is located between the first pipe section 201 and the second pipe section 202, so that the position of the thickness change of the transmission pipeline is far away from the welding seam 30, the stress concentration at the welding seam 30 is further reduced, the transmission pipeline is prevented from being broken at the welding seam 30 due to large stress concentration, and the safety of oil or natural gas transportation is improved.
In some embodiments, the second pipeline 20 further comprises a third pipe segment 203 having a centerline collinear with the centerlines of the first pipe segment 201 and the second pipe segment 202, the third pipe segment 203 is disposed between the first pipe segment 201 and the second pipe segment 202, an inner wall of the third pipe segment 203 is disposed obliquely with respect to the centerline of the third pipe segment 203, and an inner diameter of the third pipe segment 203 gradually decreases from the first pipe segment 201 to the second pipe segment 202.
The first pipe section 201, the second pipe section 202 and the third pipe section 203 can be of an integrated structure, the inner diameter of the third pipe section 203 is gradually reduced from the first pipe section 201 to the second pipe section 202, and the inner wall of the first pipe section 201 and the inner wall of the second pipe section 202 are transited through the inner wall of the third pipe section 203, so that the inner walls of the first pipe section 201 and the second pipe section 202 are transited smoothly, the axial stress concentration at the welding seam 30 is further reduced, the transmission pipeline is prevented from being broken at the welding seam 30 due to large stress concentration, and the safety of oil or natural gas transportation is improved.
In some embodiments, the inner diameter of the end of the third pipe section 203 facing the first pipe 10 is equal to the inner diameter of the first pipe section 201, and the inner diameter of the end of the third pipe section 203 facing away from the first pipe 10 is equal to the inner diameter of the second pipe section 202.
A second annular gap is provided between the extension of the inner wall of the second tube section 202 and the inner wall of the third tube section 203, which can also be machined by a bevelling machine.
In this embodiment, the third pipe segment 203 makes the transition between the inner walls of the first pipe segment 201 and the second pipe segment 202 more gradual, so as to further reduce the axial stress concentration at the weld 30, avoid the transmission pipeline from being broken at the weld 30 due to the larger stress concentration, and increase the safety of oil or gas transportation.
In some embodiments, the inner wall of the third pipe segment 203 is joined to the inner wall of the first pipe segment 201 by a predetermined curved surface 204, and the inner wall of the third pipe segment 203 is tangent to the predetermined curved surface 204.
The inner diameter of the end of the third pipe section 203 facing the first pipe 10 is smaller than the inner diameter of the first pipe section 201, and the inner diameter of the end of the third pipe section 203 facing away from the first pipe 10 is equal to the inner diameter of the second pipe section 202. The preset curved surface 204 may include a paraboloid or a cone, etc., and the preset curved surface 204 makes the transition between the inner walls of the first pipe section 201 and the third pipe section 203 more gradual, so as to further reduce the axial stress concentration at the weld 30; the inner wall of the third pipe section 203 is tangent to the preset curved surface 204, so that the preset curved surface 204 and the third pipe section 203 are in smooth transition, the axial stress concentration at the welding seam 30 is further reduced, the conveying pipeline is prevented from being broken at the welding seam 30 due to large stress concentration, and the safety of petroleum or natural gas transportation is improved.
In some embodiments, the inner wall of the first pipe segment 201 is tangent to the predetermined curved surface 204.
The inner wall of the first pipe section 201 is tangent to the preset curved surface 204, so that the preset curved surface 204 and the first pipe section 201 are in smooth transition, the axial stress concentration at the welding seam 30 is further reduced, the conveying pipeline is prevented from being broken at the welding seam 30 due to large stress concentration, and the safety of petroleum or natural gas transportation is improved.
In some embodiments, the curved surface is a curved surface.
The end of the arc surface close to the first pipe section 201 is tangent to the inner wall of the first pipe section 201, and the end of the arc surface close to the third pipe section 203 is tangent to the inner wall of the third pipe section 203.
In the cross section where the center line of the second pipeline 20 is located, the line corresponding to the arc surface is an arc, perpendicular lines passing through two ends of the arc are perpendicular lines of tangent lines at two ends, the intersection point of the two perpendicular lines is the center of the circle corresponding to the arc, the distances from the center of the circle to the two ends of the arc are equal, and the distance is the radius corresponding to the arc.
In this embodiment, the first pipe section 201 and the third pipe section 203 are transited through the arc surface, one end of the arc surface close to the first pipe section 201 is tangent to the inner wall of the first pipe section 201, one end of the arc surface close to the third pipe section 203 is tangent to the inner wall of the third pipe section 203, and the arc surface enables the transition between the first pipe section 201 and the third pipe section 203 to be smoother, so as to further reduce the axial stress concentration at the welding seam 30, avoid the transmission pipeline from being broken at the welding seam 30 due to the large stress concentration, and increase the safety of oil or natural gas transportation.
In some embodiments, in the cross section where the center line of the second pipeline 20 is located, the central angle of the arc corresponding to the arc surface is a first angle, the included angle between the third pipe segment 203 and the center line of the second pipeline 20 is a second angle, and the first angle and the second angle are equal.
When the first angle and the second angle are equal, the axial stress concentration at the welding seam 30 can be further reduced, the transmission pipeline is prevented from being broken at the welding seam 30 due to large stress concentration, and the safety of petroleum or natural gas transportation is improved.
In some embodiments, in a cross-section of the centerline of the second pipe 20, the length of the sidewall line corresponding to the inner wall of the third pipe segment 203 is smaller than the radius of the arc corresponding to the arc surface.
So set up, the cambered surface radius is greater than the length of the lateral wall lines that the inner wall of third pipeline section 203 corresponds, makes the transition between first pipeline section 201 and the third pipeline section 203 gentler to further reduce the axial stress concentration of welding seam 30 department, avoided pipeline to be in welding seam 30 department because of great stress concentration emergence fracture, increased the security of oil or natural gas transportation.
In some embodiments, the length of the first pipe segment 201 is less than or equal to 100mm, which enables the location of the thickness variation of the delivery conduit to be remote from the weld 30 and easy to machine.
In some embodiments, in the cross section where the center line of the second pipe 20 is located, the included angle between the corresponding side wall line of the inner wall of the third pipe section 203 and the center line of the second pipe 20 is 14 ° to 30 °, which facilitates the processing of the third pipe section 203 by the beveling machine.
Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; although the present invention has been described in detail with reference to the foregoing embodiments, it should be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; such modifications and substitutions do not depart from the spirit and scope of the present invention.
Claims (10)
1. A variable wall thickness pipe having an internal transition section, comprising a first pipe and a second pipe welded to the first pipe, the first pipe and the second pipe having equal outer diameters, the centerline of the first pipe and the centerline of the second pipe being collinear;
the second pipeline comprises a first pipe section and a second pipe section which are sequentially arranged along the direction far away from the first pipeline, the inner diameter of the first pipe section is equal to that of the first pipeline, the tail end of the first pipe section, which deviates from the second pipe section, is welded with the tail end of the first pipeline, and the inner diameter of the second pipe section is smaller than that of the first pipeline.
2. The unequal wall thickness pipeline according to claim 1, wherein the second pipeline further comprises a third pipeline segment having a centerline collinear with the centerlines of the first and second pipeline segments, the third pipeline segment being disposed between the first and second pipeline segments, an inner wall of the third pipeline segment being disposed obliquely relative to the centerline of the third pipeline segment, and an inner diameter of the third pipeline segment gradually decreasing from the first pipeline segment to the second pipeline segment.
3. A varying wall thickness pipeline according to claim 2, wherein the inner diameter of the third pipe section towards the end of the first pipeline is equal to the inner diameter of the first pipe section, and the inner diameter of the third pipe section away from the end of the first pipeline is equal to the inner diameter of the second pipe section.
4. The variable wall thickness pipeline according to claim 2, wherein the inner wall of the third pipeline section is joined to the inner wall of the first pipeline section by a predetermined curved surface, and the inner wall of the third pipeline section is tangent to the predetermined curved surface.
5. A pipe of unequal wall thickness according to claim 4, wherein the inner wall of the first pipe section is tangent to the predetermined curved surface.
6. A pipe of unequal wall thickness according to claim 4, wherein the curved surface is a cambered surface.
7. The pipe with unequal wall thickness according to claim 6, wherein in a cross section where the second pipe center line is located, a central angle of the arc corresponding to the arc surface is a first angle, an included angle between the third pipe section and the second pipe center line is a second angle, and the first angle and the second angle are equal.
8. The pipe with unequal wall thickness according to claim 6, wherein in a cross section where the second pipe center line is located, the length of the side wall line corresponding to the inner wall of the third pipe section is smaller than the radius of the arc corresponding to the cambered surface.
9. The unequal wall thickness pipeline according to claim 1, wherein the length of the first pipe segment is less than or equal to 100 mm.
10. The pipe with unequal wall thickness according to claim 3, wherein in a cross section where the second pipe center line is located, an included angle between a corresponding side wall line of the inner wall of the third pipe section and the second pipe center line is 14-30 °.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120012099.2U CN214404970U (en) | 2021-01-05 | 2021-01-05 | Pipe with unequal wall thickness having internal transition section |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120012099.2U CN214404970U (en) | 2021-01-05 | 2021-01-05 | Pipe with unequal wall thickness having internal transition section |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN214404970U true CN214404970U (en) | 2021-10-15 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202120012099.2U Expired - Fee Related CN214404970U (en) | 2021-01-05 | 2021-01-05 | Pipe with unequal wall thickness having internal transition section |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN214404970U (en) |
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2021
- 2021-01-05 CN CN202120012099.2U patent/CN214404970U/en not_active Expired - Fee Related
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| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20211015 |
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| CF01 | Termination of patent right due to non-payment of annual fee |