CN112780877B - B-type sleeve for repairing girth weld defects between three-way branch pipe and butt-joint steel pipe and mounting method thereof - Google Patents
B-type sleeve for repairing girth weld defects between three-way branch pipe and butt-joint steel pipe and mounting method thereof Download PDFInfo
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- CN112780877B CN112780877B CN202110077662.9A CN202110077662A CN112780877B CN 112780877 B CN112780877 B CN 112780877B CN 202110077662 A CN202110077662 A CN 202110077662A CN 112780877 B CN112780877 B CN 112780877B
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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
- F16L55/00—Devices or appurtenances for use in, or in connection with, pipes or pipe systems
- F16L55/16—Devices for covering leaks in pipes or hoses, e.g. hose-menders
- F16L55/179—Devices for covering leaks in pipes or hoses, e.g. hose-menders specially adapted for bends, branch units, branching pipes or the like
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23P—METAL-WORKING NOT OTHERWISE PROVIDED FOR; COMBINED OPERATIONS; UNIVERSAL MACHINE TOOLS
- B23P15/00—Making specific metal objects by operations not covered by a single other subclass or a group in this subclass
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E30/00—Energy generation of nuclear origin
- Y02E30/30—Nuclear fission reactors
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- Butt Welding And Welding Of Specific Article (AREA)
Abstract
The invention discloses a B-type sleeve for repairing girth weld defects between a three-way branch pipe and a butt-joint steel pipe and an installation method thereof, wherein the sleeve is used for being sleeved outside a first girth weld and comprises a large-specification boss and an improved reducing pipe, so that the in-service repair and reinforcement of girth weld defects between the three-way branch pipe and the butt-joint steel pipe can be completed under the condition that oil and gas conveying media in the three-way pipeline are not stopped.
Description
[ field of technology ]
The invention belongs to the field of repairing oil and gas transmission pipelines, and particularly relates to a B-type sleeve for repairing girth weld defects between a three-way branch pipe and a butt joint steel pipe and an installation method thereof.
[ background Art ]
The B-type sleeve is a permanent repair mode of defects of main oil and gas transmission pipelines, which is acknowledged in the industry, wherein the B-type sleeve is widely applied in the oil and gas transmission pipeline repair reinforcement field with the characteristic of non-stop transmission repair in service. However, the existing B-type sleeve repairing main body mainly comprises a steel pipe with a simple geometric structure and a butt-joint girth weld, and has technical problems for in-service repairing and reinforcing research and application of pressure equipment with a complex geometric structure.
The hot extrusion tee joint is an indispensable medium separate transmission structural member in a long transmission pipeline, is very popular in the trunk line, a valve chamber and a station, but because the tee joint structure is complex, the length of a tee joint branch pipe is limited by various factors such as material molding deformation capacity, section structure stress control, production technology and the like, the effective length is short, the tee joint branch pipe has a certain diameter reduction, when a girth joint between the tee joint branch pipe and a connected steel pipe in an operation pipeline system is defective, on one hand, the tee joint branch pipe is limited by factors such as the tee joint structure stress control requirement, on the other hand, the geometry of the tee joint branch pipe section and the length and the like, and is not suitable for directly repairing the area through sleeve installation.
[ invention ]
The invention aims to overcome the defects of the prior art, and provides a B-type sleeve for repairing the girth weld defect between a three-way branch pipe and a butt joint steel pipe and an installation method thereof, so as to solve the problem that the reinforced girth weld is difficult to repair directly in service in the prior art.
In order to achieve the purpose, the invention is realized by adopting the following technical scheme:
the B-type sleeve for repairing the girth weld defect between the three-way branch pipe and the butt joint steel pipe comprises a main pipe and a branch pipe which are integrally connected, wherein the axis of the main pipe is perpendicular to the axis of the branch pipe; the branch pipe of the tee joint is connected with the branch pipe butt joint steel pipe through a first girth weld; the B-shaped sleeve is sleeved outside the first girth weld;
the B-shaped sleeve comprises a boss and a reducing pipe;
the lower end of the boss is connected with the main pipe through a first annular fillet weld;
the reducing pipe comprises a straight pipe section and a different pipe section which are integrally connected, the straight pipe section is arranged above the different pipe section, and the upper end of the straight pipe section is connected with the branch pipe through a second annular fillet weld;
the bottom end of the different pipe section is connected with the upper end of the boss through a circumferential butt weld.
The invention further improves that:
preferably, the cross-sectional area of the upper end is smaller than the cross-sectional area of the lower end.
Preferably, the upper end is circular, and the lower end is formed by connecting four arcs end to end.
Preferably, the boss is divided into two symmetrical parts, the two symmetrical parts are symmetrical relative to the second symmetrical plane, and the two symmetrical parts are welded and connected through a first longitudinal welding seam.
Preferably, the straight pipe section is in a circular pipe shape.
Preferably, the different pipe section is in a circular truncated cone shape, and the cross section area of the top end of the different pipe section is smaller than that of the bottom end.
Preferably, the different pipe section is divided into two symmetrical parts, the two symmetrical parts are symmetrical relative to a second symmetrical plane, and the two symmetrical parts are welded and connected through a second longitudinal welding seam.
The installation method of the B-type sleeve for repairing the girth weld defect between the three-way branch pipe and the butt joint steel pipe comprises the following steps of:
and 3, welding the top end of the reducing pipe and the outer wall of the branch pipe to form a second annular fillet weld.
Preferably, in the step, the boss is divided into two symmetrical parts, the two parts are sleeved on the tee pipe fitting from two sides of the tee pipe fitting, and then the two parts are welded to form a first longitudinal welding seam.
Preferably, in step 2, the different pipe section is divided into two symmetrical parts, the two symmetrical parts wrap the branch pipe from two sides of the branch pipe, and then the two parts are welded to form a second longitudinal weld.
Compared with the prior art, the invention has the following beneficial effects:
the invention discloses a B-type sleeve for repairing girth joint defects between a three-way branch pipe and a butt-joint steel pipe, which is used for being sleeved outside a first girth joint and comprises a large-specification boss and an improved reducing pipe, and can finish in-service repair and reinforcement of girth joint defects between the three-way branch pipe and the butt-joint steel pipe under the condition that oil and gas conveying media in the three-way pipeline are not stopped.
The invention also discloses a method for installing the B-type sleeve for repairing the girth weld defect between the three-way branch pipe and the butt-joint steel pipe, which is characterized in that the boss and the reducing pipe are arranged outside the girth weld, so that the whole installation process is easy to operate.
[ description of the drawings ]
FIG. 1 is a schematic diagram of a butt welding structure of a three-way pipe fitting and a connecting steel pipe;
FIG. 2 is a schematic diagram of welding reinforcement of the boss 4;
fig. 3 is a schematic diagram of welding of the reducer pipe 7.
Wherein: 1-a three-way pipe fitting; 2-butting steel pipes by branch pipes; 3-a first girth weld; 4-a boss 4; 5-a first longitudinal weld; 6-a first annular fillet weld; 7-reducing pipes; 8-a second longitudinal weld; 9-circumferential butt welds; 10-a second annular fillet weld; 11-branch pipes; 12-a main pipe; 13-shoulder; 14-upper end; 15-lower end; 16-a first arc; 17-a second arc; 18-straight pipe sections; 19-different pipe sections; 20-top; 21-bottom end.
[ detailed description ] of the invention
The invention is described in further detail below with reference to the attached drawing figures:
in the description of the present invention, it should be noted that, directions or positional relationships indicated by terms such as "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., are based on directions or positional relationships shown in the drawings, are merely for convenience of description and simplification of description, and do not indicate or imply that the apparatus or element to be referred to must have a specific direction, be constructed and operated in the specific direction, and thus should not be construed as limiting the present invention; the terms "first," "second," "third," and the like are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance; furthermore, unless explicitly specified and limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be either fixed or removable, for example; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present invention will be understood in specific cases by those of ordinary skill in the art.
Referring to fig. 1, the sleeve repair structure comprises a large boss 4 and a modified reducer pipe 7. The three-way pipe fitting 1 comprises a main pipe 12 and a branch pipe 11, the axes of the main pipe 12 and the branch pipe 11 are mutually perpendicular, the plane where the axes of the main pipe 12 and the branch pipe 11 are located is set to be a first symmetrical plane, and the plane perpendicular to the axis of the main pipe 12 and passing through the axis of the branch pipe 11 is set to be a second symmetrical plane.
The upper end 14 of the boss 4 is welded with the reducer pipe 7 through the circumferential butt weld 9, the boss 4 comprises an upper end 14 and a lower end 15, the cross section area of the upper end 14 is smaller than that of the lower end 15, the upper end 14 is in a circular ring shape, the lower end 15 is formed by connecting four arcs end to end, the two arcs comprise two first arcs 16 and two second arcs 17, the two first arcs 16 are symmetrical relative to a first symmetrical plane, and the two second arcs 17 are symmetrical relative to a second symmetrical plane. The first arc lines 16 and the second arc lines 17 are arranged in a staggered mode and are connected end to form the lower end 15, the first arc lines 16 and the second arc lines 17 are in contact with the outer wall of the main pipe 12, and the radius of the first arc lines 16 is larger than that of the second arc lines 17.
More preferably, in order to ensure that the boss 4 is easy to install, the boss 4 is divided into two symmetrical parts along the second symmetry plane, the middle of which is welded by the first longitudinal weld 5.
The reducing pipe 7 comprises a straight pipe section 18 and a different pipe section 19, wherein the straight pipe section 18 is arranged above the different pipe section 19; the straight pipe section 18 is in an annular circular pipe shape, and the inner diameter of the straight pipe section is the sum of the outer diameter of the branch pipe butt joint steel pipe 2 and the fit clearance (0-5 mm); the isopipe section 19 is an annular truncated cone having a top end 20 with a smaller cross-sectional area than a bottom end 21. The top end 20 and the lower end of the straight tube section 18 are identical in size and integrally connected, and the bottom end 21 and the upper end 14 of the boss 4 are identical in size and are welded and connected by the circumferential butt weld 9.
The upper part of the straight pipe section 18 and the branch pipe 11 are connected by a second circular fillet weld 10, and the lower end 15 of the boss 4 and the outer pipe wall of the main pipe 12 are welded by a first circular fillet weld 6.
Step one: and (5) processing and installing the reinforcing boss 4.
Processing a boss 4: the reinforcing boss 4 is processed according to the caliber of the branch pipe 11 and the bending curvature of the shoulder 13, as shown in fig. 2, the large end of the boss 4 can be clung to the three-way pipe body, the small end of the boss 4 is suitable for butt welding of the large end of the reducing pipe 7, welding grooves are processed along the position of the first longitudinal welding seam 5, and two bilaterally symmetrical boss 4 reinforcing components are manufactured.
Mounting of the boss 4: the boss 4 is installed according to a welding schematic diagram of the boss 4 shown in fig. 2, first, welding of a first longitudinal welding line 5 is carried out, a carbon steel backing plate with the thickness of 2.5mm (carbon content of the backing plate is less than or equal to 0.23%) is installed at the root part of the first longitudinal welding line 5 of the longitudinal welding line, and direct welding on a three-way pipe body is prevented; and then welding the first annular fillet weld 6, and finishing fillet weld lap welding of the boss 4 and the three-way pipe body, so as to realize the installation of the boss 4 and facilitate the reinforcement of the shoulder of the three-way pipe and the installation of the subsequent reducing pipe 7.
Step two: and (5) machining and installing the reducing pipe 7.
Machining of the reducing pipe 7: the outer diameter of the large end of the reducing pipe 7 corresponds to the small end of the boss 4, the inner diameter of the small end of the reducing pipe 7 corresponds to the outer diameter of the steel pipe connected with the circumferential weld of the branch pipe, the length of the reducing pipe 7 is greater than the length from the boss 4 to the end part of the branch pipe, and the length of the lengthened straight pipe section is greater than or equal to 50 mm. And processing welding grooves along the position of the second longitudinal welding seam 8 shown in fig. 3 to manufacture two bilateral symmetry reducing pipe 7 reinforcing components.
Mounting of the reducing pipe 7: according to the welding schematic diagram of the reducing pipe 7 shown in fig. 3, the reducing pipe 7 is installed, firstly, the second longitudinal welding seam 8 is welded, a carbon steel backing plate with the thickness of 2.5mm (carbon content of the backing plate is less than or equal to 0.23%) is installed at the root of the longitudinal welding seam of the second longitudinal welding seam 8, and the direct welding on a steel pipe body is prevented; then welding a circumferential butt welding seam 9, and installing a carbon steel backing plate (carbon content of the backing plate is less than or equal to 0.23%) with the thickness of 2.5mm at the root of the welding seam to finish butt welding of the reducing pipe 7 and the boss 4; and finally, welding a second annular fillet weld 10 to finish fillet weld lap welding of the reducing pipe 7 and the steel pipe, and realizing welding and sealing of the whole sleeve structural member.
Examples
The three-way valve is described by taking D1016X 508mm 28mm X80 hot drawing with the design pressure of 10MPa as an example. The branch pipe connection steel pipe of the tee joint is phi 508 multiplied by 18.4mm X60 steel pipe. The repair reinforcing sleeve is selected as the reducing pipe 7 with the thickness of 28mm and the strength level of X80 for repair reinforcing, and the minimum wall thickness requirement of the boss 4 and the reducing pipe 7 is 28mm; the inner wall of the small end of the reducing pipe 7 is tightly attached to the branch pipe to be connected with the steel pipe, and the inner diameter is controlled to be 508mm; the large end of the reducing pipe 7 is in butt welding with the small end of the boss 4, and the outer diameter is 610mm; the large end of the boss 4 can be clung to the three-way pipe body.
The installation welding sequence is shown in fig. 2 and 3, and the welding 10 of the 5-longitudinal welding seam, the first annular fillet welding seam 6, the second longitudinal welding seam 8, the annular butt welding seam 9 and the second annular fillet welding seam is sequentially completed, wherein the butt joint gap between the second longitudinal welding seam 8 and the annular butt welding seam 9 is controlled to be 2-6mm, a carbon steel backing plate (the carbon content of the backing plate is less than or equal to 0.23%) with the thickness of 2.5mm is installed at the welding root, and the annular fillet welding seam is the fillet welding seam lap joint welding of the sleeve and the pipe body, so that the heat input quantity is required to be controlled, and the in-service repair welding quality and the operation safety are ensured.
The foregoing description of the preferred embodiments of the invention is not intended to be limiting, but rather is intended to cover all modifications, equivalents, alternatives, and improvements that fall within the spirit and scope of the invention.
Claims (2)
1. A method for installing a B-shaped sleeve for repairing the girth weld defect between a three-way branch pipe and a butt joint steel pipe is characterized in that,
the three-way pipe fitting (1) comprises a main pipe (12) and a branch pipe (11) which are integrally connected, wherein the axis of the main pipe (12) and the axis of the branch pipe (11) are mutually perpendicular; the branch pipe (11) of the tee joint is connected with the branch pipe butt joint steel pipe (2) through a first girth weld (3); the B-shaped sleeve is sleeved outside the first girth weld (3);
the B-shaped sleeve comprises a boss (4) and a reducing pipe (7);
the lower end (15) of the boss (4) is connected with the main pipe (12) through a first annular fillet weld (6);
the reducing pipe (7) comprises a straight pipe section (18) and a different pipe section (19) which are integrally connected, the straight pipe section (18) is arranged above the different pipe section (19), and the upper end of the straight pipe section (18) is connected with the branch pipe (11) through a second annular fillet weld (10);
the different pipe section (19) is in a circular truncated cone shape, and the cross section area of the top end (20) of the different pipe section (19) is smaller than that of the bottom end (21); the wall thickness of the reducing pipe (7) and the boss (4) is 28mm;
the bottom end (21) of the different pipe section (19) is connected with the upper end (14) of the boss (4) through a circumferential butt weld (9);
the installation method comprises the following steps:
step 1, sleeving a boss (4) outside a three-way pipe fitting (1), and welding the lower end (15) of the boss (4) and a main pipe (12) to form a first annular fillet weld (6); the boss (4) is divided into two symmetrical parts, the two parts are sleeved on the three-way pipe fitting (1) from two sides of the three-way pipe fitting (1), and then the two parts are welded to form a first longitudinal welding seam (5); a carbon steel backing plate with the thickness of 2.5mm is arranged at the root part of a first longitudinal welding seam (5) of the longitudinal welding seam; then welding the first annular fillet weld (6), and finishing fillet weld lap welding of the boss (4) and the three-way pipe fitting (1);
step 2, sleeving the reducing pipe (7) outside the branch pipe (11), firstly welding a second longitudinal welding seam (8), and installing a carbon steel backing plate with the thickness of 2.5mm at the root of the second longitudinal welding seam (8); the upper end (14) of the welding boss (4) and the bottom end (21) of the reducing pipe (7) form a circumferential butt welding seam (9); a carbon steel backing plate with the thickness of 2.5mm is arranged at the root of the circumferential butt welding seam (9);
and 3, welding the top end (20) of the reducing pipe (7) and the outer wall of the branch pipe (11) to form a second annular fillet weld (10).
2. A B-type sleeve for repairing girth weld defects between a tee branch pipe and a butt steel pipe, obtained by the installation method of claim 1, characterized in that the tee pipe (1) comprises a main pipe (12) and a branch pipe (11) integrally connected, the axis of the main pipe (12) and the axis of the branch pipe (11) being mutually perpendicular; the branch pipe (11) of the tee joint is connected with the branch pipe butt joint steel pipe (2) through a first girth weld (3); the B-shaped sleeve is sleeved outside the first girth weld (3);
the B-shaped sleeve comprises a boss (4) and a reducing pipe (7);
the lower end (15) of the boss (4) is connected with the main pipe (12) through a first annular fillet weld (6);
the reducing pipe (7) comprises a straight pipe section (18) and a different pipe section (19) which are integrally connected, the straight pipe section (18) is arranged above the different pipe section (19), and the upper end of the straight pipe section (18) is connected with the branch pipe (11) through a second annular fillet weld (10);
the bottom end (21) of the different pipe section (19) is connected with the upper end (14) of the boss (4) through a circumferential butt weld (9);
the cross-sectional area of the upper end (14) is smaller than the cross-sectional area of the lower end (15);
the upper end (14) is in a circular ring shape, and the lower end (15) is formed by connecting four arcs end to end;
the boss (4) is divided into two symmetrical parts, the two symmetrical parts are symmetrical relative to a second symmetrical plane, and the two symmetrical parts are welded and connected through a first longitudinal welding seam (5);
the straight pipe section (18) is in a circular pipe shape;
the different pipe section (19) is in a circular truncated cone shape, and the cross section area of the top end (20) of the different pipe section (19) is smaller than that of the bottom end (21);
the different pipe section (19) is divided into two symmetrical parts, the two symmetrical parts are symmetrical relative to a second symmetrical plane, and the two symmetrical parts are welded and connected through a second longitudinal welding seam (8).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110077662.9A CN112780877B (en) | 2021-01-20 | 2021-01-20 | B-type sleeve for repairing girth weld defects between three-way branch pipe and butt-joint steel pipe and mounting method thereof |
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|---|---|---|---|
| CN202110077662.9A CN112780877B (en) | 2021-01-20 | 2021-01-20 | B-type sleeve for repairing girth weld defects between three-way branch pipe and butt-joint steel pipe and mounting method thereof |
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| CN113217738A (en) * | 2021-05-24 | 2021-08-06 | 中国能源建设集团山西省电力勘测设计院有限公司 | Reinforced three-way structure for directly-buried laying of thermal pipeline |
| CN114227153A (en) * | 2021-12-03 | 2022-03-25 | 江苏核电有限公司 | Device and method for maintaining fillet weld overlaying layer of nuclear power station |
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