CA2059622C - Pipe coupling - Google Patents
Pipe couplingInfo
- Publication number
- CA2059622C CA2059622C CA 2059622 CA2059622A CA2059622C CA 2059622 C CA2059622 C CA 2059622C CA 2059622 CA2059622 CA 2059622 CA 2059622 A CA2059622 A CA 2059622A CA 2059622 C CA2059622 C CA 2059622C
- Authority
- CA
- Canada
- Prior art keywords
- sealing
- frusto
- pipe connection
- conical
- load
- 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.)
- Expired - Lifetime
Links
Landscapes
- Non-Disconnectible Joints And Screw-Threaded Joints (AREA)
- Earth Drilling (AREA)
Abstract
A pipe coupling or connection comprises a female coupling component and a mating male coupling component. Each component is matingly threaded for coupling engagement, and each is provided with an adjacent frusto-conical sealing surface. The sealing surface is provided with a controlled surface roughness, viz. very shallow fine surface variations, preferably formed as microgrooves at a pitch small relative to the pitch of the threads. The slope of the frusto-conical surface of the sealing area of the male component is slightly mismatched with that of the sealing area of the female component to simulate the bearing force vs. axial distance characteristic of shrunk-fit circular cylindrical sealing surfaces. The slight mismatch enables the sealing pressure to be above a design minimum throughout the entire sealing area yet higher at each end of the sealing area.
As the coupling is assembled, thread interference in the vicinity of the sealing surface lags the occurrence of interference between the sealing surfaces. Load threads are provided with negatively inclined load flank faces.
As the coupling is assembled, thread interference in the vicinity of the sealing surface lags the occurrence of interference between the sealing surfaces. Load threads are provided with negatively inclined load flank faces.
Claims (37)
1. A pipe connection of the type having a female component and a mating male component, each matingly threaded for connection therebetween, and each provided with a sealing area adjacent the threaded area, the sealing area of the coupling components being formed as mating frusto-conical surfaces each having a preselected gauge point intermediate the axial ends of the sealing area, at least one of said frusto-conical surfaces having controlled surface roughness; the respective sealing areas of the components being in axially aligned sealing engagement when the pipe connection has been assembled; characterized in that:
(a) the slopes of the frusto-conical sealing surfaces are each relatively shallow;
(b) the slope of the frusto-conical sealing surface of the male component is slightly less than that of the frusto-conical sealing surface of the female component; and (c) the sealing bearing load relative to axial dis-tance of the contacting sealing surfaces of the assembled compo-nents being selected to lie above a preselected design minimum but below force levels at which galling occurs, said bearing load of the assembled components qualitatively simulating that of a pair of mating shrunk-fit circular cylindrical sealing surfaces.
(a) the slopes of the frusto-conical sealing surfaces are each relatively shallow;
(b) the slope of the frusto-conical sealing surface of the male component is slightly less than that of the frusto-conical sealing surface of the female component; and (c) the sealing bearing load relative to axial dis-tance of the contacting sealing surfaces of the assembled compo-nents being selected to lie above a preselected design minimum but below force levels at which galling occurs, said bearing load of the assembled components qualitatively simulating that of a pair of mating shrunk-fit circular cylindrical sealing surfaces.
2. A pipe connection as defined in claim 1, wherein the mismatch between the slopes of the frusto-conical sealing surfaces of the male and female components in inches per inch is less than the nominal interference in inches at the gauge points of the said sealing surfaces.
3. A pipe connection as defined in claim 1, wherein the load flank faces of the load threads of both the male and female components are negatively inclined to the radial.
., 44
., 44
4. A pipe connection as defined in claim 2, wherein the load flank faces of the load threads of both the male and female components are negatively inclined to the radial.
5. A pipe connection as defined in claim 3, wherein the angle of negative inclination of the load flank faces does not exceed about 10 degrees, and the sum of the load flank angle and stab flank angle of the threads to the radial is at least equal to about 15 degrees.
6. A pipe connection as defined in claim 4, wherein the angle of negative inclination of the load flank faces does not exceed about 10 degrees, and the sum of the load flank angle and stab flank angle of the threads to the radial is at least equal to about 15 degrees.
7. A pipe connection as defined in claim 2, wherein the female component is provided with an interior torque shoulder forming an annular seat engageable by and mating with the distal end of the male component.
8. A pipe connection as defined in claim 7, wherein the face of the annular seat is negatively inclined to the radial.
9. A pipe connection as defined in claim 2, wherein the slope of the frusto-conical sealing surface of the male component is substantially the same as the slope of the thread pitch line of the male component.
10. A pipe connection as defined in claim 2, wherein prior to assembly, to at least one of the sealing surfaces is applied a high-temperature high-solids sealing lubricant containing mashable solid particles.
11. A pipe connection of the type having a female component and a mating male component, each matingly threaded for connection therebetween, and each provided with a sealing area -djacent the threaded area, the sealing area of the coupling components being formed as mating frusto-conical surfaces each having a preselected gauge point intermediate the axial ends of the sealing area, at least one of said frusto-conical surfaces having controlled surface roughness; the respective sealing areas of the components being in axially aligned sealing engagement when the pipe connection has been assembled; characterized in that:
(a) the slopes of the frusto-conical sealing surfaces are each relatively shallow;
(b) when the connection is being assembled, interference between the sealing surfaces occurs before any occurrence of any radially-directed interference of the load threads of the male and female components in the vicinity of the sealing surfaces;
(c) upon complete assembly of the connection, any interference between the load threads is insufficient to tend to pry the sealing surfaces apart to an extent that would reduce the sealing bearing load below the minimum design value for the connection; and (d) the sealing bearing load relative to axial distance of the contacting sealing surfaces of the assembled components being selected to lie above a preselected design minimum but below force levels at which galling occurs, said bearing load of the assembled components qualitatively simulating that of a pair of mating shrunk-fit circular cylindrical sealing surfaces.
(a) the slopes of the frusto-conical sealing surfaces are each relatively shallow;
(b) when the connection is being assembled, interference between the sealing surfaces occurs before any occurrence of any radially-directed interference of the load threads of the male and female components in the vicinity of the sealing surfaces;
(c) upon complete assembly of the connection, any interference between the load threads is insufficient to tend to pry the sealing surfaces apart to an extent that would reduce the sealing bearing load below the minimum design value for the connection; and (d) the sealing bearing load relative to axial distance of the contacting sealing surfaces of the assembled components being selected to lie above a preselected design minimum but below force levels at which galling occurs, said bearing load of the assembled components qualitatively simulating that of a pair of mating shrunk-fit circular cylindrical sealing surfaces.
12. A pipe connection as defined in claim 11, wherein upon complete assembly of the connection, there is no thread interference creating a radial force between the said frusto-conical sealing surfaces.
13. A pipe connection of the type having a female component and a mating male component, each matingly threaded for connection therebetween, and each provided with a sealing area adjacent the threaded area, the sealing area of the coupling components being formed as mating frusto-conical surfaces each ?aving a preselected gauge point intermediate the axial ends of the sealing area, at least one of said frusto-conical surfaces having controlled surface roughness; the respective sealing areas of the components being in axially aligned sealing engagement when the pipe connection has been assembled; characterized in that :
(a) the slopes of the frusto-conical sealing surfaces are each relatively shallow;
(b) the slope of the frusto-conical sealing surface of the male component is slightly less than that of the frusto-conical sealing surface of the female component;
(c) the sealing bearing load relative to axial distance of the contacting sealing surfaces of the assembled component being selected to lie above a preselected design minimum but below force levels at which galling occurs, said bearing load qualitatively simulating that of a pair of mating shrunk-fit circular cylindrical sealing surfaces;
(d) when the connection is being assembled, interference between the sealing surfaces occurs before any occurrence of any radially-directed interference of the load threads of the male and female components in the vicinity of the sealing surfaces;
(e) upon complete assembly of the connection, any interference between the load threads is insufficient to tend to pry the sealing surfaces apart to an extent that would reduce the sealing bearing load below the minimum design value for the connection.
(a) the slopes of the frusto-conical sealing surfaces are each relatively shallow;
(b) the slope of the frusto-conical sealing surface of the male component is slightly less than that of the frusto-conical sealing surface of the female component;
(c) the sealing bearing load relative to axial distance of the contacting sealing surfaces of the assembled component being selected to lie above a preselected design minimum but below force levels at which galling occurs, said bearing load qualitatively simulating that of a pair of mating shrunk-fit circular cylindrical sealing surfaces;
(d) when the connection is being assembled, interference between the sealing surfaces occurs before any occurrence of any radially-directed interference of the load threads of the male and female components in the vicinity of the sealing surfaces;
(e) upon complete assembly of the connection, any interference between the load threads is insufficient to tend to pry the sealing surfaces apart to an extent that would reduce the sealing bearing load below the minimum design value for the connection.
14. A pipe connection as defined in claim 13, wherein upon complete assembly of the connection, there is no thread interference creating a radial force between the said frusto-conical sealing surfaces.
15. A pipe connection as defined in claim 13, wherein the mismatch in inches per inch between the slopes of the frusto-conical sealing surfaces of the male and female components is less than the nominal interference in inches at the gauge points of the said sealing surfaces.
16. A pipe connection as defined in claim 15, wherein the load flank faces of the load threads of both the male and female components are negatively inclined to the radial.
17. A pipe connection as defined in claim 16, wherein the angle of negative inclination of the load flank faces does not exceed about 10 degrees, and the sum of the load flank angle and stab flank angle of the threads to the radial is at least equal to about 15 degrees.
18. A pipe connection as defined in claim 17, wherein the female component is provided with an interior torque shoulder forming an annular seat engageable by and mating with the distal end of the male component.
19. A pipe connection as defined in claim 18, wherein the face of the annular seat is negatively inclined.
20. For use in a pipe connection of the type having a female component and a mating male component, each matingly threaded for connection therebetween, and each provided with a sealing area adjacent the threaded area, the sealing area of the coupling components being formed as mating frusto-conical surfaces, at least one of said frusto-conical surfaces having controlled surface roughness; the respective sealing areas of the components being in axially aligned sealing engagement when the pipe connection has been assembled; a female component of the foregoing type characterized in that:
(a) the slope of the frusto-conical sealing surface thereof is relatively shallow:
(b) the slope of the frusto-conical sealing surface thereof is slightly greater than that of the frusto-conical sealing surface of the mating male component; and (c) the slope of the load thread pitch line thereof relative to the axis thereof is slightly less steep than the load thread pitch line of the mating male component relative to the axis thereof.
(a) the slope of the frusto-conical sealing surface thereof is relatively shallow:
(b) the slope of the frusto-conical sealing surface thereof is slightly greater than that of the frusto-conical sealing surface of the mating male component; and (c) the slope of the load thread pitch line thereof relative to the axis thereof is slightly less steep than the load thread pitch line of the mating male component relative to the axis thereof.
21. For use in pipe connection of the type having a female component and a mating male component, each matingly threaded for connection therebetween, and each provided with a sealing area adjacent the threaded area, the sealing area of the coupling components being formed as mating frusto-conical surfaces, at least one of said frusto-conical surfaces having controlled surface roughness; the respective sealing areas of the components being in axially aligned sealing engagement when the pipe connection has been assembled; a female component of the foregoing type characterized in that:
(a) the slope of the frusto-conical sealing surface thereof is relatively shallow;
(b) when the connection is being assembled, interfere-nce between the sealing surfaces of the female component and the mating male component occurs before the occurrence of any radially-directed interference of the load threads of the male and female components in the vicinity of the sealing surfaces;
(c) upon complete assembly of the connection, any interference between the load threads of the female component and the mating male component is insufficient to tend to pry the sealing surfaces of the said female and male components apart to an extent that would reduce the sealing bearing load below the minimum design value for the connection; and (d) the slope of the load thread pitch line of the female component relative to the axis thereof is slightly less steep than the load thread pitch line of the mating male component relative to the axis thereof.
(a) the slope of the frusto-conical sealing surface thereof is relatively shallow;
(b) when the connection is being assembled, interfere-nce between the sealing surfaces of the female component and the mating male component occurs before the occurrence of any radially-directed interference of the load threads of the male and female components in the vicinity of the sealing surfaces;
(c) upon complete assembly of the connection, any interference between the load threads of the female component and the mating male component is insufficient to tend to pry the sealing surfaces of the said female and male components apart to an extent that would reduce the sealing bearing load below the minimum design value for the connection; and (d) the slope of the load thread pitch line of the female component relative to the axis thereof is slightly less steep than the load thread pitch line of the mating male component relative to the axis thereof.
22. For use in a pipe connection of the type having a female component and a mating male component, each matingly threaded for connection therebetween, and each provided with a sealing area adjacent the threaded area, the sealing area of the coupling components being formed as mating frusto-conical surfaces, at least one of said frusto-conical surfaces having controlled surface roughness; the respective sealing areas of the components being in axially aligned sealing engagement when the pipe connection has been assembled; a female component of the foregoing type characterized in that:
(a) the slopes of the frusto-conical sealing surface thereof is relatively shallow;
(b) the slope of the frusto-conical sealing surface thereof is slightly greater than that of the frusto-conical sealing surface of the mating male component;
(c) when the connection is being assembled, interfere-nce between the sealing surfaces of the female component and the mating male component occurs before the occurrence of any radially-directed interference of the load threads of the male and female components in the vicinity of the sealing surfaces;
(d) upon complete assembly of the connection, any interference between the load threads of the female component and the mating male component is insufficient to tend to pry the sealing surfaces of the said female and male components apart to an extent that would reduce the sealing bearing load below the minimum design value for the connection; and (e) the slope of the load thread pitch line thereof relative to the axis thereof is slightly less steep than the load thread pitch line of the mating male component relative to the axis thereof.
(a) the slopes of the frusto-conical sealing surface thereof is relatively shallow;
(b) the slope of the frusto-conical sealing surface thereof is slightly greater than that of the frusto-conical sealing surface of the mating male component;
(c) when the connection is being assembled, interfere-nce between the sealing surfaces of the female component and the mating male component occurs before the occurrence of any radially-directed interference of the load threads of the male and female components in the vicinity of the sealing surfaces;
(d) upon complete assembly of the connection, any interference between the load threads of the female component and the mating male component is insufficient to tend to pry the sealing surfaces of the said female and male components apart to an extent that would reduce the sealing bearing load below the minimum design value for the connection; and (e) the slope of the load thread pitch line thereof relative to the axis thereof is slightly less steep than the load thread pitch line of the mating male component relative to the axis thereof.
23. For use in a pipe connection of the type having a female component and a mating male component, each matingly threaded for connection therebetween, and each provided with a sealing area adjacent the threaded area, the sealing area of the coupling components being formed as mating frusto-conical surfaces each having a preselected gauge point intermediate the axial ends of the sealing area, at least one of said frusto-conical surfaces having controlled surface roughness; the respective sealing areas of the components being in axially aligned sealing engagement when the pipe connection has been assembled; a female component of the foregoing type characterized in that:
(a) the slopes of the frusto-conical sealing surface thereof is relatively shallow;
(b) the slope of the frusto-conical sealing surface thereof is slightly greater than that of the frusto-conical sealing surface of the mating male component; and (c) the sealing bearing load on the sealing surface thereof relative to axial distance of the contacting sealing surfaces of the assembled female and male components being selected to lie above a preselected design minimum but below force levels at which galling occurs, said bearing load when the pipe connection has been assembled qualitatively simulating that of a pair of mating shrunk-fit circular cylindrical sealing surfaces.
(a) the slopes of the frusto-conical sealing surface thereof is relatively shallow;
(b) the slope of the frusto-conical sealing surface thereof is slightly greater than that of the frusto-conical sealing surface of the mating male component; and (c) the sealing bearing load on the sealing surface thereof relative to axial distance of the contacting sealing surfaces of the assembled female and male components being selected to lie above a preselected design minimum but below force levels at which galling occurs, said bearing load when the pipe connection has been assembled qualitatively simulating that of a pair of mating shrunk-fit circular cylindrical sealing surfaces.
24. A female component for a pipe connection as defined in claim 23, wherein the mismatch between the slopes of the frusto-conical sealing surfaces of the male and female components is less than the nominal interference in inches at the gauge points of the said sealing surfaces when the connection has been assembled.
25. A female component for a pipe connection as defined in claim 23, wherein the load flank faces of the load threads of both the male and female components are negatively inclined to the radial.
26. A female component for a pipe connection as defined in claim 23, wherein the load flank faces of the load threads of both the male and female components are negatively inclined to the radial, the angle of negative inclination of the load flank faces not exceeding about 10 degrees.
27. A female component for a pipe connection as defined in claim 23, wherein the mismatch between the male and female thread pitch line angle is less than that which would afford 50% contact between the distal end of the male component and the mating threads of the female component.
28. For use in a pipe connection of the type having a female component and a mating male component, each matingly threaded for connection therebetween, and each provided with a sealing area adjacent the threaded area, the sealing area of the coupling components being formed as mating frusto-conical surfaces, at least one of said frusto-conical surfaces having controlled surface roughness; the respective sealing areas of the components being in axially aligned sealing engagement when the pipe connection has been assembled; a female component of the foregoing type characterized in that:
(a) the slopes of the frusto-conical sealing surface thereof is relatively shallow;
(b) when the connection is being assembled, interference between the sealing surfaces occurs before any occurrence of any radially-directed interference of the load threads of the male and female components in the vicinity of the sealing surfaces;
(c) upon complete assembly of the connection, any interference between the load threads is insufficient to tend to pry the sealing surfaces apart to an extent that would reduce the sealing bearing load below the minimum design value for the connection; and (d) the sealing bearing load relative to axial distance of the contacting sealing surfaces of the assembled components being selected to lie above a preselected design minimum but below force levels at which galling occurs, said bearing load of the assembled components qualitatively simulating that of a pair of mating shrunk-fit circular cylindrical sealing surfaces.
(a) the slopes of the frusto-conical sealing surface thereof is relatively shallow;
(b) when the connection is being assembled, interference between the sealing surfaces occurs before any occurrence of any radially-directed interference of the load threads of the male and female components in the vicinity of the sealing surfaces;
(c) upon complete assembly of the connection, any interference between the load threads is insufficient to tend to pry the sealing surfaces apart to an extent that would reduce the sealing bearing load below the minimum design value for the connection; and (d) the sealing bearing load relative to axial distance of the contacting sealing surfaces of the assembled components being selected to lie above a preselected design minimum but below force levels at which galling occurs, said bearing load of the assembled components qualitatively simulating that of a pair of mating shrunk-fit circular cylindrical sealing surfaces.
29. For use in a pipe connection of the type having a female component and a mating male component, each matingly threaded for connection therebetween, and each provided with a sealing area adjacent the threaded area, the sealing area of the coupling components being formed as mating frusto-conical surfaces, at least one of said frusto-conical surfaces having controlled surface roughness; the respective sealing areas of the components being in axially aligned sealing engagement when the pipe connection has been assembled; a female component of the foregoing type characterized in that:
(a) the slopes of the frusto-conical sealing surface thereof is relatively shallow;
(b) the slope of the frusto-conical sealing surface thereof is slightly greater than that of the frusto-conical sealing surface of the mating male component;
(c) when the connection is being assembled, interference between the sealing surfaces occurs before any occurrence of any radially-directed interference of the load threads of the male and female components in the vicinity of the sealing surfaces;
(d) upon complete assembly of the connection, any interference between the load threads of the female component and the mating male component is insufficient to tend to pry the sealing surfaces apart to an extent that would reduce the sealing bearing load below the minimum design value for the connection;
and (e) the sealing bearing load relative to axial distance of the contacting sealing surfaces of the assembled components being selected to lie above a preselected design minimum but below force levels at which galling occurs, said bearing load of the assembled components qualitatively simulating that of a pair of mating shrunk-fit circular cylindrical sealing surfaces.
(a) the slopes of the frusto-conical sealing surface thereof is relatively shallow;
(b) the slope of the frusto-conical sealing surface thereof is slightly greater than that of the frusto-conical sealing surface of the mating male component;
(c) when the connection is being assembled, interference between the sealing surfaces occurs before any occurrence of any radially-directed interference of the load threads of the male and female components in the vicinity of the sealing surfaces;
(d) upon complete assembly of the connection, any interference between the load threads of the female component and the mating male component is insufficient to tend to pry the sealing surfaces apart to an extent that would reduce the sealing bearing load below the minimum design value for the connection;
and (e) the sealing bearing load relative to axial distance of the contacting sealing surfaces of the assembled components being selected to lie above a preselected design minimum but below force levels at which galling occurs, said bearing load of the assembled components qualitatively simulating that of a pair of mating shrunk-fit circular cylindrical sealing surfaces.
30. A pipe connection as defined in claim 1, wherein the female component is provided with an interior torque shoulder forming an annular seat engageable by and mating with the distal end of the male component.
31. A pipe connection as defined in claim 30, wherein the face of the annular seat is negatively inclined to the radial.
32. A pipe connection as defined in claim 1, wherein the slope of the frusto-conical sealing surface of the male component is substantially the same as the slope of the thread pitch line of the male component.
33. A pipe connection as defined in claim 1, wherein prior to assembly, to at least one of the sealing surfaces is applied a high temperature high-solids sealing lubricant containing mashable solid particles.
34. A pipe connection as defined in claim 14, wherein the load flank faces of the load threads of both the male and female components are negatively inclined to the radial.
35. A pipe connection as defined in claim 34, wherein the angle of negative inclination of the load flank faces does not exceed about 10 degrees, and the sum of the load flank angle and stab flank angle of the threads to the radial is at least equal to about 15 degrees.
36. A pipe connection as defined in claim 35, wherein the female component is provided with an interior torque shoulder forming an annular seat engageable by and mating with the distal end of the male component.
37. A pipe connection as defined in claim 36, wherein the face of the annular seat is negatively inclined.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US07/770,567 | 1991-10-03 | ||
| US07/770,567 US5348350A (en) | 1980-01-19 | 1991-10-03 | Pipe coupling |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CA2059622A1 CA2059622A1 (en) | 1993-04-04 |
| CA2059622C true CA2059622C (en) | 1996-06-25 |
Family
ID=25089004
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA 2059622 Expired - Lifetime CA2059622C (en) | 1991-10-03 | 1992-01-17 | Pipe coupling |
Country Status (1)
| Country | Link |
|---|---|
| CA (1) | CA2059622C (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE4428871C2 (en) * | 1994-08-08 | 1996-10-02 | Mannesmann Ag | Pipe connector |
-
1992
- 1992-01-17 CA CA 2059622 patent/CA2059622C/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| CA2059622A1 (en) | 1993-04-04 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| EEER | Examination request | ||
| MKEX | Expiry |