CN110274120A - Oversleeve - Google Patents
Oversleeve Download PDFInfo
- Publication number
- CN110274120A CN110274120A CN201810219829.9A CN201810219829A CN110274120A CN 110274120 A CN110274120 A CN 110274120A CN 201810219829 A CN201810219829 A CN 201810219829A CN 110274120 A CN110274120 A CN 110274120A
- Authority
- CN
- China
- Prior art keywords
- plate body
- pipeline
- cracking
- transition
- oversleeve
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Classifications
-
- 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
- F16L55/168—Devices for covering leaks in pipes or hoses, e.g. hose-menders from outside the pipe
- F16L55/17—Devices for covering leaks in pipes or hoses, e.g. hose-menders from outside the pipe by means of rings, bands or sleeves pressed against the outside surface of the pipe or hose
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
- F16L58/00—Protection of pipes or pipe fittings against corrosion or incrustation
- F16L58/18—Protection of pipes or pipe fittings against corrosion or incrustation specially adapted for pipe fittings
Abstract
The invention discloses a kind of oversleeves, belong to pipe first-aid field.The oversleeve includes: two arc plate bodys.Two arc plate bodys are symmetrically fixed on the outer wall of pipeline, and for after docking at the cracking of sealing pipeline, and the middle part of arc plate body is transition plate body, and transition plate body is used to accommodate the polymorphic structure formed after pipeline cracking.Arc plate body includes: sequentially connected first plate body, transition plate body, the second plate body.First plate body and the second plate body are fixed on the outer wall of pipeline.The junction of transition plate body and the first plate body, the second plate body is smooth transition.Elliposoidal hollow structure is formed after two transition Plate butt connections.The curvature of elliposoidal hollow structure is greater than or equal to the curvature of the polymorphic structure.Oversleeve provided by the invention forms polymorphic structure, will not influence the docking of two arc plate bodys even if evagination occurs after cracking for pipeline.Also, the case where axle sleeve can not only be suitable for situation more gentle at pipeline cracking, also can be suitably used for evagination at pipeline cracking.
Description
Technical field
The present invention relates to pipe first-aid field, in particular to a kind of oversleeve.
Background technique
In oil field during production operation, the tube wall of oil-gas pipeline due to corrosive pipeline, mechanical damage etc. often
The phenomenon that cracking not only causes economic loss so as to cause oil and gas leakage, but also pollutes the environment.Therefore,
In order to avoid oil and gas leakage occurs for pipeline, providing a kind of can be very necessary by the oversleeve sealed at pipeline cracking.
The oversleeve that the relevant technologies provide includes: two arc panels that pipe structure can be formed after docking.It is needing to pipeline
Cracking at when being sealed, two arc panels are respectively fitted on the outer wall of pipeline, make two arc panels by the cracking of pipeline
Place is completely covered.At this point, two arc panels are docked, and the two is weldingly connected from the docking of two arc panels, meanwhile, it will
The end of two arc panels and the outer wall of pipeline are weldingly connected, and then the sealing at complete twin conduit cracking.
The inventor finds that the existing technology has at least the following problems:
The oversleeve that the prior art provides is only applicable to situation more gentle at pipeline cracking.And it is sent out after cracking once pipeline
Raw evagination, then needing the concave portion by oversleeve to pipeline during being sealed at cracking of the oversleeve to pipeline
Applying biggish power just can make two arc panels complete docking, and be easy to damage pipeline by pressure in this way, so that pipeline is cracked more serious.
Summary of the invention
The embodiment of the invention provides a kind of oversleeves, can solve above-mentioned technical problem.Specific technical solution is as follows:
The embodiment of the invention provides a kind of oversleeve, the oversleeve includes: two arc plate bodys, is symmetrically fixed on pipeline
On outer wall, at the cracking for sealing the pipeline after docking；
The middle part of the arc plate body is transition plate body, and the transition plate body, which is used to accommodate, to be formed after pipeline cracking
Polymorphic structure；
The arc plate body includes: sequentially connected first plate body, the transition plate body, the second plate body；
First plate body and second plate body are fixed on the outer wall of the pipeline；
The transition plate body is used to accommodate the polymorphic structure formed after the pipeline cracking, and, the transition plate body
Junction with first plate body, second plate body is smooth transition；
Elliposoidal hollow structure is formed after two transition Plate butt connections；
The curvature of the elliposoidal hollow structure is greater than or equal to the curvature of the polymorphic structure.
In a kind of possible design, the length of first plate body, the length of second plate body are all larger than or are equal to
The half of the transition plates body length.
In a kind of possible design, the both ends of the arc plate body are provided with crack arrest ring, the fixed suit of the crack arrest ring
On the outer wall of the pipeline.
In a kind of possible design, corrosion-inhibiting coating is provided on the inner and outer wall of the arc plate body.
In a kind of possible design, the corrosion-inhibiting coating in the arc panel body on wall is dual―layer fusion bonded epoxy painting
Layer, the corrosion-inhibiting coating on outer wall is viscoelastic body coating.
In a kind of possible design, the thickness of the dual―layer fusion bonded epoxy coating is greater than or equal to 500 μm；
The thickness of the viscoelastic body coating is greater than or equal to 1.8mm.
In a kind of possible design, it is radially provided with two respectively at the docking of two arc plate body two sides
A convex block；
Two convex blocks are used to seal after docking at the cracking of the pipeline.
In a kind of possible design, the thickness of the convex block is greater than or equal to 30mm.
Technical solution provided in an embodiment of the present invention has the benefit that
Oversleeve provided in an embodiment of the present invention by the way that two arc plate bodys are arranged, and fixes two arc plate bodys symmetrically
On the outer wall of pipeline, and after docking at the cracking of sealing pipeline, avoid due to the oil and gas leakage that tube wall cracks and generates
Problem.By the way that transition plate body will be set as in the middle part of arc plate body, and formed after being cracked using transition plate body receiving pipeline
Polymorphic structure forms polymorphic structure, will not influence the docking of two arc plate bodys even if evagination occurs after cracking for pipeline.
As it can be seen that oversleeve provided in an embodiment of the present invention can be applied not only to situation more gentle at pipeline cracking, can also be suitable for
At pipeline cracking the case where evagination.
Detailed description of the invention
To describe the technical solutions in the embodiments of the present invention more clearly, make required in being described below to embodiment
Attached drawing is briefly described, it should be apparent that, drawings in the following description are only some embodiments of the invention, for
For those of ordinary skill in the art, without creative efforts, it can also be obtained according to these attached drawings other
Attached drawing.
Fig. 1 is the main view of oversleeve provided in an embodiment of the present invention；
Fig. 2 is the top view of oversleeve provided in an embodiment of the present invention.
Appended drawing reference respectively indicates:
1 arc plate body,
101 first plate bodys,
102 transition plate bodys,
103 second plate bodys,
2 crack arrest rings,
3 convex blocks,
L1The length of first plate body (or second plate body),
L2The length of transition plate body,
L3The thickness of convex block,
C1The height of first polymorphic structure,
C2The height of second polymorphic structure,
C3The height of third polymorphic structure,
D1The minor axis radius of elliposoidal hollow structure.
Specific embodiment
To make the object, technical solutions and advantages of the present invention clearer, below in conjunction with attached drawing to embodiment party of the present invention
Formula is described in further detail.
The embodiment of the invention provides a kind of oversleeves, and as shown in Figure 1 and Figure 2, which includes: two arc plate bodys
1.Two arc plate bodys 1 are symmetrically fixed on the outer wall of pipeline, for after docking at the cracking of sealing pipeline, and arc plate body
1 middle part is transition plate body 102, which is used to accommodate the polymorphic structure formed after pipeline cracking.Arc plate body 1
It include: sequentially connected first plate body 101, transition plate body 102, the second plate body 103.First plate body 101 and the second plate body 103 are solid
It is scheduled on the outer wall of pipeline.The junction of transition plate body 102 and the first plate body 101, the second plate body 103 is smooth transition.Two
Transition plate body 102 forms elliposoidal hollow structure after docking.The curvature of elliposoidal hollow structure is greater than or equal to polymorphic structure
Curvature.Wherein, " polymorphic structure " refers to: the irregular deformation formed after pipeline cracking, i.e., outer male structure and concave inward structure are handed over
Mistake distribution is formed by structure.
When needing to be sealed at the cracking to pipeline, make the transition plate body 102 and pipeline at two arc plate bodys, 1 middle part
Cracking at it is opposite, and two arc plate bodys 1 are symmetrically fixed on the outer wall of pipeline, at this point, two arc plate bodys 1 are completed pair
It connects, realizes to the sealing at pipeline cracking.If pipeline forms polymorphic structure after cracking, by two arc plate bodys 1
The transition plate body 102 at middle part docks, and forms elliposoidal hollow structure, to accommodate the polymorphic structure formed after pipeline cracking, at this point,
First plate body 101 and the second plate body 103 are fixed on the outer wall of pipeline, can be completed to the sealing at pipeline cracking.
Oversleeve provided in an embodiment of the present invention by the way that two arc plate bodys 1 are arranged, and keeps two arc plate bodys 1 symmetrically solid
It is scheduled on the outer wall of pipeline, and after docking at the cracking of sealing pipeline, avoids since the oil gas that tube wall cracks and generates is let out
Leakage problem.By setting transition plate body 102 for the middle part of arc plate body 1, and pipeline is accommodated using the transition plate body 102 and is cracked
The polymorphic structure formed afterwards forms polymorphic structure even if evagination occurs after cracking for pipeline, will not influence two arc panels
The docking of body 1.As it can be seen that oversleeve provided in an embodiment of the present invention can be applied not only to situation more gentle at pipeline cracking,
The case where capable of being suitable for evagination at pipeline cracking.By the way that sequentially connected first plate body 101, transition plate body 102, second is arranged
Plate body 103, and it is fixed on the first plate body 101 and the second plate body 103 on the outer wall of pipeline, while holding using transition plate body 102
The polymorphic structure formed after pipeline of receiving cracking is capable of fixing while on pipeline in guarantee arc plate body 1, avoids two arcs
Shape plate body 1 can be expressed to the polymorphic structure formed after pipeline cracking in docking.By by transition plate body 102 and the first plate body
101, the junction of the second plate body 103 is set as seamlessly transitting, and avoids transition plate body 102 and the first plate body 101, the second plate body
There are larger crustal stress to concentrate for 103 junction, thus the oil-air pressure in unbearable pipeline.
Wherein, the first plate body 101 and the second plate body 103 are semi-circular shape plate body structure compatible with pipeline.
The curvature A of elliposoidal hollow structure1Calculation formula are as follows:
A1=(D1-R)/R；
Wherein, D1For the minor axis radius of elliposoidal hollow structure, R is the radius of pipeline；
The curvature A of polymorphic structure2Calculation formula are as follows:
Wherein, CiFor the height of polymorphic structure, i is the number of polymorphic structure；
A1≥A2。
Transition plate body 102 by making two arc plate bodys 1 forms elliposoidal hollow structure after docking, and makes the elliposoidal
The curvature A of hollow structure1The curvature A of >=polymorphic structure2, while reducing oversleeve volume, ensure that the polymorphic structure can begin
It is contained in the elliposoidal hollow structure eventually, prevents two arc plate bodys 1 from squeezing polymorphic structure during docking, cause pipe
Road damage, makes pipeline crack more serious.
In order to guarantee that two arc plate bodys 1 connect fastening with the outer wall of pipeline, while making two arc plate bodys 1 after docking
It can be realized to the sealing at pipeline cracking, it can be by the both ends fillet welding of arc plate body 1 on the outer wall of pipeline, and in two arcs
After shape plate body 1 completes docking, the two is connected in a welding manner.
In order to guarantee that oversleeve is able to bear the maximum operating pressure of pipeline, the thickness of arc plate body 1 is set greater than or
Equal to the thickness of pipeline.Wherein, the material of arc plate body 1 and the material of pipeline are identical.
It, can be by the first plate body 101, transition plate body 102, the second plate in order to guarantee that arc plate body 1 has enough intensity
Body 103 is sequentially connected in a welding manner；First plate body 101, transition plate body 102, the second plate body 103 can also be integrally machined
Molding, and then form arc plate body 1.
It, can be by the first plate body in order to reduce two the first plate bodys 101 after docking by the influence of internal pipe pressure
The gap of 2mm-5mm (such as 3mm, 3.5mm) is set between 101 and pipeline outer wall.
It, can be by the second plate body in order to reduce two the second plate bodys 103 after docking by the influence of internal pipe pressure
The gap of 2mm-5mm (such as 3mm, 3.5mm) is set between 103 and pipeline outer wall.
It is understood that in order to reduce the occupied space of oversleeve, while guaranteeing that it can will be complete at pipeline cracking
Sealing, keeps the long axis of elliposoidal hollow structure consistent with the axis direction of pipeline.
It, can be by the length of the first plate body 101, second in order to guarantee oversleeve uniform force during the production operation of oil field
The length of plate body 103 is disposed as the half more than or equal to 102 length of transition plate body.
Wherein, transition plate body 102 length it is to be understood that above-mentioned elliposoidal hollow structure long axis length.The length
More than or equal to 100mm, for example, the length can be 120mm, 125mm etc..
In embodiments of the present invention, as shown in Figure 1 and Figure 2, the both ends of arc plate body 1 are provided with crack arrest ring 2, should be only
Driffractive ring 2 is fixedly set on the outer wall of pipeline.
It by the way that crack arrest ring 2 is arranged at the both ends of arc plate body 1, and is fixed on it on outer wall of pipeline, is preventing pipeline
On crackle continue extension while, the intensity at oversleeve both ends can be improved.It is understood that when the fixed suit of crack arrest ring 2
When on the outer wall of pipeline, radially inward power is applied with to pipeline, meanwhile, which has certain thickness, can be effective
Prevent pipeline from continuing to crack.
Wherein, crack arrest ring 2 is semicircle ring structure compatible with pipeline.The outer diameter of crack arrest ring 2 is greater than the outer diameter of pipeline extremely
Few 30mm (such as 35mm, 40mm), it is long that the thickness of the crack arrest ring 2 is greater than or equal to 101 length of the first plate body, the second plate body 103
The 1/5 of degree, so that crack arrest ring 2 meets crack arrest requirement.
In order to improve tightness of the crack arrest ring 2 on pipeline outer wall, crack arrest ring 2 can be welded on the outer wall of pipeline.
In order to guarantee that oversleeve provided in an embodiment of the present invention has preferably corrosion resistance, while mitigating scene to oversleeve
Corrosion prevention operation can be respectively provided with corrosion-inhibiting coating on the inner and outer wall of arc plate body 1.
Further, the characteristic based on dual―layer fusion bonded epoxy and viscoelastic body strong corrosion resistant, in order to enhance the resistance to of oversleeve
Corrosivity can set dual―layer fusion bonded epoxy coating for the corrosion-inhibiting coating on 1 inner wall of arc plate body, and will be on outer wall
Corrosion-inhibiting coating is set as viscoelastic body coating.
Further, in order to guarantee that dual―layer fusion bonded epoxy coating and viscoelastic body coating have stronger corrosion resistance
While, can save the cost, the thickness of dual―layer fusion bonded epoxy coating can be set greater than or be equal to 500 μm (such as
600 μm, 700 μm etc.)；The thickness of viscoelastic body coating is set greater than or is equal to 1.8mm (such as 1.9mm, 2.1mm).
In order to avoid dual―layer fusion bonded epoxy coating or viscoelastic body can be destroyed when welding to two arc plate bodys 1
Coating, as shown in Fig. 2, radially setting can be distinguished at the docking of two 1 two sides of arc plate body, and there are two convex blocks
3, two convex blocks 3 are used for after docking at the cracking of sealing pipeline.
It is understood that by setting convex block 3, when needing to weld the two after two arc plate bodys 1 dock,
It only needs respectively to weld together two convex blocks 3 of two 1 two sides of arc plate body.
Wherein, the structure of convex block 3 can be a variety of, for example, its can be strip structure, cylindrical structure etc., only
Guarantee that two are capable of at the cracking of sealing pipeline after docking.It specifically, can be convex by two of arc plate body two sides
Block 3 connects in a welding manner after docking.
It should be noted that dual―layer fusion bonded epoxy coating gross area is sprayed on the inner wall of arc plate body 1, and viscoelastic body
Coating can reserve the welding surface of above-mentioned convex block 3 and crack arrest ring 2 in spraying.
Further, in order to avoid convex block 3 welding when be damaged, the thickness of convex block 3 can be set greater than or
Equal to 30mm (such as 35mm, 40mm).
It is below X60 with material, length 2.35m, outer diameter is 300mm (radius is 150mm), wall thickness 16mm, and
It is arranged for the axially disposed pipeline for having the crack 20cm on tube wall, oversleeve provided in an embodiment of the present invention is carried out furtherly
It is bright.
As shown in Fig. 1, there are multiple polymorphic structures, wherein the height of highest polymorphic structure is at the pipeline cracking
6mm (i.e. the height C1 of the first polymorphic structure, the height C2 of the second polymorphic structure, third polymorphic structure height C3In maximum
Value is 6mm), curvature
The material of the oversleeve is X60, comprising: the arc plate body 1 that two length are 66cm.The arc plate body 1 includes: sequentially
The first plate body 101, the transition plate body 102, the second plate body 103 of connection, the length L of first plate body 101 and the second plate body 1031
For 18cm, the length L of transition plate body 1022For 30cm.
Pipe structure, radius 152mm are formed after two the first plate body 101 (or two second plate bodys 103) docking.
The transition plate body 102 of two arc plate bodys 1 forms elliposoidal hollow structure after docking, the elliposoidal hollow structure
Minor axis radius D1For 160mm.
The curvature A of the elliposoidal hollow structure1=(D1- R)/R=(160-150)/150=0.067 >=A2, meet oversleeve
Use condition.
In addition, the dual―layer fusion bonded epoxy coating that the inner wall of the arc plate body 1 is provided with a thickness of 500 μm, outer wall
It is provided with the viscoelastic body coating with a thickness of 1.8mm.
Radially there are two convex block 3, the height of the convex block 3 for setting respectively at the docking of two 1 two sides of arc plate body
For 18mm, thickness L3For 30mm.
The both ends of arc plate body 1 are provided with crack arrest ring 2, and the radius of the crack arrest ring 2 is 330mm, with a thickness of 60mm.
When needing to be sealed at the cracking to pipeline, make two transition plate bodys 102 of arc plate body 1 and opening for pipeline
Split that place is opposite, to two arc plate bodys 1,1 both ends of arc plate body 2, two 1 docking of arc plate body of crack arrest ring at convex block 3 it is complete
After docking, above-mentioned arc plate body 1, crack arrest ring 2, convex block 3 are welded two-by-two at docking, and by two arc plate bodys 1
It is symmetrically welded on the outer wall of pipeline, and then is realized to the sealing at pipeline cracking with multiple convex blocks 3, avoid pipeline that oil gas occurs
Leakage.
To sum up, oversleeve provided in an embodiment of the present invention can be applied not only to situation more gentle at pipeline cracking, also can
The case where being enough suitable for evagination at pipeline cracking.
The foregoing is merely presently preferred embodiments of the present invention, the protection scope being not intended to limit the invention, all in this hair
Within bright spirit and principle, any modification, equivalent replacement, improvement and so on should be included in protection scope of the present invention
Within.
Claims (8)
1. a kind of oversleeve, which is characterized in that the oversleeve includes: two arc plate bodys (1), is symmetrically fixed on the outer wall of pipeline
On, at the cracking for sealing the pipeline after docking；
The middle part of the arc plate body (1) is transition plate body (102), and the transition plate body (102) is opened for accommodating the pipeline
The polymorphic structure formed after splitting；
The arc plate body (1) includes: sequentially connected first plate body (101), the transition plate body (102), the second plate body
(103)；
First plate body (101) and second plate body (103) are fixed on the outer wall of the pipeline；
The junction of the transition plate body (102) and first plate body (101), second plate body (103) is smooth transition；
Elliposoidal hollow structure is formed after two transition plate body (102) docking；
The curvature of the elliposoidal hollow structure is greater than or equal to the curvature of the polymorphic structure.
2. oversleeve according to claim 1, which is characterized in that the length of first plate body (101), second plate body
(103) length is all larger than or is equal to the half of transition plate body (102) length.
3. -2 described in any item oversleeves according to claim 1, which is characterized in that the both ends of the arc plate body (1) are provided with
Crack arrest ring (2), the crack arrest ring (2) are fixedly set on the outer wall of the pipeline.
4. oversleeve according to claim 1, which is characterized in that be respectively provided on the inner and outer wall of the arc plate body (1)
There is corrosion-inhibiting coating.
5. oversleeve according to claim 4, which is characterized in that the corrosion-inhibiting coating on arc plate body (1) inner wall is double
Layer External fusion bonded epoxy coating, the corrosion-inhibiting coating on outer wall are viscoelastic body coating.
6. oversleeve according to claim 5, which is characterized in that the thickness of the dual―layer fusion bonded epoxy coating be greater than or
Equal to 500 μm；
The thickness of the viscoelastic body coating is greater than or equal to 1.8mm.
7. oversleeve according to claim 5, which is characterized in that distinguish at the docking of two arc plate body (1) two sides
Radially there are two convex block (3) for setting；
Two convex blocks (3) are used to seal after docking at the cracking of the pipeline.
8. oversleeve according to claim 7, which is characterized in that the thickness of the convex block (3) is greater than or equal to 30mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810219829.9A CN110274120A (en) | 2018-03-16 | 2018-03-16 | Oversleeve |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810219829.9A CN110274120A (en) | 2018-03-16 | 2018-03-16 | Oversleeve |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN110274120A true CN110274120A (en) | 2019-09-24 |
Family
ID=67957873
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201810219829.9A Pending CN110274120A (en) | 2018-03-16 | 2018-03-16 | Oversleeve |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN110274120A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113199201A (en) * | 2021-04-25 | 2021-08-03 | 中国石油天然气集团有限公司 | Sleeve for repairing butt-joint girth weld defects of tee main pipe and machining and repairing method |
| CN113199202A (en) * | 2021-04-25 | 2021-08-03 | 中国石油天然气集团有限公司 | Sleeve for repairing weld defects of connecting ring of three-way branch pipe and machining and repairing method |
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| CN204942907U (en) * | 2015-08-10 | 2016-01-06 | 中国石油天然气集团公司 | A kind of coated oversleeve |
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| US20030197006A1 (en) * | 2002-04-18 | 2003-10-23 | Martinez Jeff D. | System and method for encapsulating a pipe |
| CN102602093A (en) * | 2012-02-21 | 2012-07-25 | 中国石油天然气集团公司 | Composite crack arresting ring structure for oil and gas transmission pipeline |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113199201A (en) * | 2021-04-25 | 2021-08-03 | 中国石油天然气集团有限公司 | Sleeve for repairing butt-joint girth weld defects of tee main pipe and machining and repairing method |
| CN113199202A (en) * | 2021-04-25 | 2021-08-03 | 中国石油天然气集团有限公司 | Sleeve for repairing weld defects of connecting ring of three-way branch pipe and machining and repairing method |
| CN113199202B (en) * | 2021-04-25 | 2023-02-21 | 中国石油天然气集团有限公司 | Sleeve for repairing weld defects of connecting ring of three-way branch pipe and machining and repairing method |
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Application publication date: 20190924 |