CN114046393A - A device for sealing and strength protection of pipeline breaks in nuclear power plants - Google Patents
A device for sealing and strength protection of pipeline breaks in nuclear power plants Download PDFInfo
- Publication number
- CN114046393A CN114046393A CN202111292099.3A CN202111292099A CN114046393A CN 114046393 A CN114046393 A CN 114046393A CN 202111292099 A CN202111292099 A CN 202111292099A CN 114046393 A CN114046393 A CN 114046393A
- Authority
- CN
- China
- Prior art keywords
- sealing
- pipeline
- strength
- nuclear power
- connecting rod
- 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
Images
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
- F16L55/172—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 the ring, band or sleeve being tightened by a tangentially arranged threaded pin and a nut
-
- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09F—DISPLAYING; ADVERTISING; SIGNS; LABELS OR NAME-PLATES; SEALS
- G09F7/00—Signs, name or number plates, letters, numerals, or symbols; Panels or boards
Landscapes
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Theoretical Computer Science (AREA)
- Gasket Seals (AREA)
Abstract
The invention belongs to the technical field of nuclear power station pipeline maintenance, and particularly relates to a device for sealing a pipeline break and protecting strength of a nuclear power station; by changing the force application mode of the clamp, the plane structure of the sealing rubber strip and the form of the butt joint interface, the stress condition of the sealing rubber strip is improved, the weak sensitive area of the rubber strip is eliminated, the sealing structure is optimized, the sealing performance is enhanced, and the injection amount of pipeline media to the periphery is reduced when the clamp is installed. Through installation strength protection mechanism, reduce pipeline fracture risk.
Description
Technical Field
The application belongs to the technical field of nuclear power station pipeline maintenance, and particularly relates to a device for sealing a pipeline break and protecting strength of a nuclear power station.
Background
The pipelines of the nuclear power station are numerous, wherein most of the media are steam, acid-base liquid, seawater and the like, and are influenced by problems of fluid medium corrosion, vibration, scouring, temperature, pressure, pipeline materials, welding defects and the like, the pipelines face various breaking problems of pitting corrosion, weld joint cracking, cracks and the like, and the pipeline breaking treatment is an important component of nuclear power station maintenance activities.
At present, pipeline crevasse treatment is generally divided into welding treatment and temporary sealing treatment. The welding mode is divided into repair welding and cutting re-welding according to the condition of pipeline breakage, the sealing effect is visual and reliable, and the welding mode is favored by engineering technicians all the time. However, the welding technology has limitations, the water-containing welding of the pipeline cannot achieve an ideal effect, and the welding strength and the quality of a welding seam are poor; PT or RT verification of the welded seam after welding achieves the best effect under the condition of no medium operation. Therefore, when the welding mode is adopted for treatment, the system is required to be stopped, the residual water in the pipeline is discharged, the dry and clean environment in the pipeline is ensured, the operation is time-consuming and labor-consuming, and the chain reaction is also caused by the stopping of the system, so that the economic loss is brought.
The welding mode can not completely meet the actual requirement of the current maintenance activity due to the constraint of various external conditions, the pipeline temporary sealing technology is required to be provided to make up the defects on the one hand, a clamp is used for properly treating a pipeline crevasse when the welding operation is inconvenient to execute, and the welding treatment is executed again when the maintenance conditions are appropriate, so that the problem is thoroughly solved.
Disclosure of Invention
The utility model aims at providing a device that is used for nuclear power station pipeline breach to seal and intensity protection, when solving welding mode and can not accord with current maintenance activity actual demand totally, the problem of interim sealing treatment pipeline breach.
The technical scheme for realizing the purpose of the application is as follows:
the application provides a device that is used for nuclear power station pipeline breach to seal and intensity protection includes: a seal assembly and two strength protection assemblies;
the sealing assembly is fastened at a pipeline crevasse and used for sealing the crevasse;
the two strength protection assemblies are respectively fastened on the pipelines at two sides of the sealing assembly and are connected by a rigid connecting rod for preventing the pipelines from being broken;
the seal assembly, comprising: the sealing gasket and the two hoops can be tightly opened and closed;
the inner sides of the two hoops are of groove structures, the sealing gaskets are arranged in the grooves of the two hoops, and the radians of the groove structures are matched with the radians of the pipeline openings.
Alternatively to this, the first and second parts may,
and one ends of the two anchor ears are respectively welded at two ends of the hinge, and the other ends of the two anchor ears are tightly connected with the anchor ear nuts through anchor ear bolts.
Alternatively to this, the first and second parts may,
one side that sealed pad and pipeline contact is multichannel groove type structure, sealed pad kneck adopts sawtooth pattern cross design, groove type structure's width sealed width with match.
Alternatively to this, the first and second parts may,
the thickness of the sealing gasket is not less than 2 mm.
Alternatively to this, the first and second parts may,
the interface of the sealing gasket is far away from the crevasse.
Alternatively to this, the first and second parts may,
the strength protection assembly comprises two connecting rod bases; the two connecting rod bases are fixedly arranged on the outer wall of the pipeline through bolts;
the connecting rod base is provided with a through hole for penetrating through the hard connecting rod; the hard connecting rod is provided with threads and is fixed with the connecting rod base through a connecting rod nut.
Alternatively to this, the first and second parts may,
at least two rigid connecting rods are arranged.
Alternatively to this, the first and second parts may,
the outer surfaces of the sealing component and the two strength protection components are coated with black and yellow alternate warning colors.
The beneficial technical effect of this application lies in:
(1) the application provides an in being arranged in the device of nuclear power station pipeline breach sealing and intensity protection, sealed the pad and adopt groove structure and zigzag articulate, form multichannel sealing layer, prevent effectively that the medium from leaking outward.
(2) The application provides a device that is used for nuclear power station pipeline breach to seal and intensity protection, staple bolt one side adopt with hinge welding mode fixed, the mode of one side fastening has effectively reduced the inhomogeneous condition of sealed pad atress, eliminates the weak point, the sealed effect of reinforcing pad.
(3) The application provides a device for nuclear power station pipeline breach is sealed and intensity protection, and the prevention that can be fine is because breach department pipeline strength reduces, and the fracture takes place under pipeline vibration, medium erode and the action of gravity.
(4) The application provides a device for sealing a pipeline break and protecting strength of a nuclear power station, which can be repeatedly used in a mode of replacing an aging sealing gasket, and is energy-saving and environment-friendly.
(5) The application provides a device for sealing a pipe break and protecting strength of a nuclear power station, which is simple in structure, low in cost, easy to process, very convenient for on-site manufacture of a power station and capable of being quickly used for solving the problem of sealing the pipe break.
(6) The application provides a device that is used for nuclear power station pipeline breach to seal and intensity protection, and the black yellow looks warning colour of surface coating, the color is bright, plays good warning effect, can prevent that personnel are injured under the unexpected condition.
Drawings
Fig. 1 is a schematic structural diagram of an apparatus for sealing a pipe break and protecting strength of a nuclear power plant according to an embodiment of the present disclosure;
fig. 2 is a partial structural schematic view of a seal assembly in an apparatus for sealing a pipe break and protecting strength of a nuclear power plant according to an embodiment of the present disclosure;
fig. 3 is a schematic cross-sectional structural diagram of a sealing gasket in an apparatus for sealing a pipe break and protecting strength of a nuclear power plant according to an embodiment of the present disclosure;
fig. 4 is a schematic structural diagram of an interface of a sealing gasket in an apparatus for sealing a pipe break and protecting strength of a nuclear power plant according to an embodiment of the present application.
In the figure: 1-a sealing assembly; 11-sealing gasket, 12-hoop, 13-hinge, 14-hoop bolt and 15-hoop nut;
2-a strength protection component; 21-connecting rod base, 22-base bolt, 23-base nut;
3-a pipeline;
4-a rigid connecting rod; 41-connecting rod nut.
Detailed Description
In order to make the technical solutions in the embodiments of the present application more comprehensible to those skilled in the art, the following description will be made in detail and completely with reference to the accompanying drawings in the embodiments of the present application. It should be apparent that the embodiments described below are only some of the embodiments of the present application, and not all of them. All other embodiments that can be derived by a person skilled in the art from the embodiments described herein without inventive step are within the scope of the present application.
The inventor finds that the conventional temporary pipeline sealing clamp for the nuclear power station is generally formed by adding sealing rubber to two semicircular anchor ears, and the two clamps are connected through bolts at two sides to apply force to clamp sealing rubber strips by utilizing the contact crevasses of the sealing rubber. Because both sides all have the pulling force, the adhesive tape produces deformation under the effect of anchor clamps frictional force, causes the adhesive tape to pull the power little in bolt department, and the department that leaks receives the pulling force big, and the adhesive tape becomes weak sensitive at the department that leaks. Because the surface of the rubber strip is a smooth plane, huge extrusion force is formed at the contact broken part instantly, the pipeline medium is sprayed to the periphery, and because the rubber strip is a plane, the sealing structure is single, and the condition of untight sealing exists. In addition, the pipeline breach shows that the structural strength of the pipeline at the position is changed, the corrosion area of the inner wall of the pipeline is larger than that of the outer wall of the pipeline, and the observation shows that the current sealing technology only relates to breach treatment, and the potential consequences of pipeline bending and fracture caused by the strength change of the pipeline are not considered.
Therefore, according to the embodiment of the application, the force application mode of the clamp, the plane structure of the sealing rubber strip and the butt joint interface form are changed, the stress condition of the sealing rubber strip is improved, the weak sensitive area of the rubber strip is eliminated, the sealing structure is optimized, the sealing performance is enhanced, and the spraying amount of pipeline media to the periphery is reduced when the clamp is installed. Through installation strength protection mechanism, reduce pipeline fracture risk.
Based on the above, in order to clearly and specifically explain the above advantages of the present application, the following description of the embodiments of the present application will be made with reference to the accompanying drawings.
Referring to fig. 1, the drawing is a schematic structural diagram of an apparatus for sealing a pipe break and protecting strength of a nuclear power plant according to an embodiment of the present disclosure.
The device that is used for nuclear power station pipeline breach to seal and intensity protection that this application embodiment provided includes: a sealing component 1 and two strength protection components 2;
the sealing component 1 is fastened at a crevasse of the pipeline 3 and used for sealing the crevasse;
the two strength protection components 2 are respectively fastened on the pipelines at two sides of the sealing component 1, and the two strength protection components 2 are connected by a rigid connecting rod 4 and used for preventing the pipeline 3 from being broken;
the inner sides of the two hoops 12 are of groove-shaped structures, the sealing gaskets 11 are arranged in the grooves of the two hoops 12, and the radian of each groove-shaped structure is matched with that of a pipeline fracture.
The device for sealing the pipeline breach of the nuclear power station and protecting the strength of the pipeline breach of the nuclear power station realizes sealing of the pipeline breach, and can also prevent the pipeline from being broken under the actions of pipeline vibration, gravity and medium scouring due to strength reduction of the position of the breach.
In some possible implementations of the embodiment of the present application, as shown in fig. 1 and fig. 2, one end of each of the two anchor ears 12 is welded to the two ends of the hinge 13, and the other end of each of the two anchor ears 12 is fastened and connected to the anchor ear nut 15 through an anchor ear bolt 14.
Link together two staple bolts 12 through hinge 13, the opposite side of two staple bolts 12 passes through staple bolt 14, staple bolt nut 15 links together, makes seal assembly 1 possess the wide-angle function that opens and shuts, can install at the leakage pipeline after the welding is accomplished, has effectively reduced the sealed 11 uneven circumstances of atress that fills up, eliminates weak point, and the sealed effect of 11 that fills up of reinforcing is sealed.
In some possible implementations of the embodiment of the present application, as shown in fig. 3, the side of the sealing gasket 11 contacting the pipe 3 has a multi-channel groove structure; as shown in fig. 4, the interface of the sealing gasket 11 adopts a zigzag cross design, and the width of the sealing gasket in a groove-shaped structure is matched with the width of the sealing gasket.
It can be understood that the sealing gasket 11 is connected with the zigzag joints by adopting a groove structure to form a plurality of sealing layers, and the leakage of the medium in the pipeline can be effectively prevented.
In concrete application, sealed 11 can be for self-control long strip form, settle in staple bolt 12's inslot, through the sealed 11 axial degree of freedom of groove restriction of staple bolt 12, the breach is kept away from to the kneck of sealed 11, and the interface position is in 3 breaches of pipeline positions as far as possible and faces.
In a specific example, the thickness of the gasket 11 is not less than 2mm to ensure the sealing effect.
With continued reference to fig. 1, in some possible implementations of embodiments of the present application, the strength protection assembly 2 includes two link bases 21; the connecting rod bases 21 are provided with arc-shaped grooves, the arc-shaped grooves are matched with the shape of the pipeline 3, and the two connecting rod bases 21 are tightly fixed on the outer wall of the pipeline 3 through bolts (namely, base bolts 22 and base nuts 23 in the figure);
the connecting rod base 21 is provided with a through hole for penetrating the hard connecting rod 4; the rigid connecting rod 4 is provided with a thread and is fixed with the connecting rod base 21 through a connecting rod nut 41.
In one example, there are at least two stiff connecting rods 4 to ensure a uniform force application to the strength protection assembly 2.
In some possible implementation manners of the embodiment of the application, the outer surfaces of the sealing component 1 and the two strength protection components 2 are coated with black and yellow alternate warning colors, the color is bright, a good warning effect is achieved, and the injury of people under an unexpected condition can be prevented.
In a specific scenario, the device for sealing and protecting the pipe break of the nuclear power plant provided by the present application may be implemented as follows:
1. checking a drawing and confirming the specific size of the crevasse pipeline 3 on site;
2. manufacturing 4 connecting rod bases 21 according to the size of the crevasse pipeline 3;
3. manufacturing a rigid connecting rod 4 according to the on-site space condition, wherein the target is to avoid the barrier on the crevasse pipeline 3;
4. manufacturing 2 hoops 12 according to the size of the on-site crevasse pipeline 3;
5. manufacturing a hinge 13;
6. connecting the manufactured 2 hoops 12 with the hinge 13 together in a welding mode;
7. arranging the sealing gasket 11 in the groove of the manufactured hoop 12, wherein the interface position is opposite to the crevasse position of the crevasse pipeline 3 as much as possible;
8. polishing and cleaning the crevasse opening of the crevasse pipeline 3, removing rust particles and avoiding influencing the sealing effect of the sealing gasket 11;
9. installing 2 hoops 12 on the crevasse pipeline 3, and screwing hoop nuts 15 on hoop bolts 14 to realize sealing;
10. placing the 2-piece connecting rod base 21 on the crevasse pipeline 3, penetrating through the base bolt 22 and screwing the base nut 23;
11. one rigid connecting rod 4 penetrates through the connecting rod base 21, the effective thread length of the rigid connecting rod 4 is observed in the front and the back of the connecting rod base 4, and the other rigid connecting rod 4 is installed in the same way;
12. another 2 link bases 21 are respectively passed through 2 rigid connecting rods 4, and also the front and rear of the link bases 21 are secured with effective thread portions on the rigid connecting rods 4, base bolts 22 are installed, and base nuts 23 are tightened.
The device for sealing the pipeline break and protecting the strength of the nuclear power station pipeline provided after the installation is finished realizes the sealing of the pipeline break 3, and can also prevent the pipeline break from being broken under the vibration, gravity and medium scouring action of the pipeline 3 due to the reduction of the strength of the position of the break. Use this device simple manufacture, can play good effect to the urgent sealed of pipeline, on-the-spot maintenance personal can change partial design according to actual conditions, for example the size of seal assembly 1 and two intensity protection subassemblies 2 to the adaptation field demand.
The present application has been described in detail with reference to the drawings and examples, but the present application is not limited to the above examples, and various changes can be made within the knowledge of those skilled in the art without departing from the spirit of the present application. The prior art can be used for all the matters not described in detail in this application.
Claims (8)
1. The utility model provides a device that is used for nuclear power station pipeline breach to seal and intensity protection which characterized in that: the apparatus, comprising: a seal assembly and two strength protection assemblies;
the sealing assembly is fastened at a pipeline crevasse and used for sealing the crevasse;
the two strength protection assemblies are respectively fastened on the pipelines at two sides of the sealing assembly and are connected by a rigid connecting rod for preventing the pipelines from being broken;
the seal assembly, comprising: the sealing gasket and the two hoops can be tightly opened and closed;
the inner sides of the two hoops are of groove structures, the sealing gaskets are arranged in the grooves of the two hoops, and the radians of the groove structures are matched with the radians of the pipeline openings.
2. The apparatus for sealing and protecting the pipe break and the strength of a nuclear power plant according to claim 1, wherein:
and one ends of the two anchor ears are respectively welded at two ends of the hinge, and the other ends of the two anchor ears are tightly connected with the anchor ear nuts through anchor ear bolts.
3. The device for sealing and protecting the strength of the pipeline breach of the nuclear power plant according to claim 1, wherein:
one side that sealed pad and pipeline contact is multichannel groove type structure, sealed pad kneck adopts sawtooth pattern cross design, groove type structure's width sealed width with match.
4. The apparatus for sealing and protecting the pipe break and the strength of a nuclear power plant according to claim 3, wherein:
the thickness of the sealing gasket is not less than 2 mm.
5. The apparatus for sealing and protecting the pipe break and the strength of a nuclear power plant according to claim 3, wherein:
the interface of the sealing gasket is far away from the crevasse.
6. The apparatus for sealing and protecting the pipe break and the strength of a nuclear power plant according to claim 1, wherein:
the strength protection assembly comprises two connecting rod bases; the two connecting rod bases are fixedly arranged on the outer wall of the pipeline through bolts;
the connecting rod base is provided with a through hole for penetrating through the hard connecting rod; the hard connecting rod is provided with threads and is fixed with the connecting rod base through a connecting rod nut.
7. The apparatus for sealing and protecting the pipe break and the strength of a nuclear power plant according to claim 1, wherein: at least two rigid connecting rods are arranged.
8. The apparatus for sealing and protecting the pipe break and the strength of a nuclear power plant according to claim 1, wherein:
the outer surfaces of the sealing component and the two strength protection components are coated with black and yellow alternate warning colors.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111292099.3A CN114046393A (en) | 2021-11-03 | 2021-11-03 | A device for sealing and strength protection of pipeline breaks in nuclear power plants |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111292099.3A CN114046393A (en) | 2021-11-03 | 2021-11-03 | A device for sealing and strength protection of pipeline breaks in nuclear power plants |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN114046393A true CN114046393A (en) | 2022-02-15 |
Family
ID=80206955
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202111292099.3A Pending CN114046393A (en) | 2021-11-03 | 2021-11-03 | A device for sealing and strength protection of pipeline breaks in nuclear power plants |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN114046393A (en) |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| RU2292512C1 (en) * | 2004-07-07 | 2007-01-27 | Дочерняя Компания "Укртрансгаз" Национальной Акционерной Компании "Нефтегаз Украины" | Method of repairing rectilinear section of pipeline |
| KR20110100068A (en) * | 2010-03-03 | 2011-09-09 | (주) 영남메탈 | Pocket packing for repairing pipe holes |
| KR20160003795U (en) * | 2015-04-23 | 2016-11-02 | 김성욱 | Assembly of clamps for connecting pipes |
| CN206221894U (en) * | 2016-10-31 | 2017-06-06 | 西安石油大学 | A kind of hinge type antiskid sealing clamp |
| CN214093567U (en) * | 2020-11-16 | 2021-08-31 | 天津金优凯能源科技有限公司 | Gas leakage protection device |
| CN218208411U (en) * | 2021-11-03 | 2023-01-03 | 江苏核电有限公司 | Device for sealing pipeline break and protecting strength of nuclear power station |
-
2021
- 2021-11-03 CN CN202111292099.3A patent/CN114046393A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| RU2292512C1 (en) * | 2004-07-07 | 2007-01-27 | Дочерняя Компания "Укртрансгаз" Национальной Акционерной Компании "Нефтегаз Украины" | Method of repairing rectilinear section of pipeline |
| KR20110100068A (en) * | 2010-03-03 | 2011-09-09 | (주) 영남메탈 | Pocket packing for repairing pipe holes |
| KR20160003795U (en) * | 2015-04-23 | 2016-11-02 | 김성욱 | Assembly of clamps for connecting pipes |
| CN206221894U (en) * | 2016-10-31 | 2017-06-06 | 西安石油大学 | A kind of hinge type antiskid sealing clamp |
| CN214093567U (en) * | 2020-11-16 | 2021-08-31 | 天津金优凯能源科技有限公司 | Gas leakage protection device |
| CN218208411U (en) * | 2021-11-03 | 2023-01-03 | 江苏核电有限公司 | Device for sealing pipeline break and protecting strength of nuclear power station |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US3467141A (en) | Flange coupling repair ring | |
| US4133351A (en) | Method and apparatus for sealing a pipeline leak | |
| CN218208411U (en) | Device for sealing pipeline break and protecting strength of nuclear power station | |
| CN107830302B (en) | Sleeve for repairing bent pipe and method for repairing bent pipe | |
| CN210344705U (en) | Pressurized leakage blocking structure for gas pipeline | |
| CN114046393A (en) | A device for sealing and strength protection of pipeline breaks in nuclear power plants | |
| CN110748743A (en) | Oil leakage plugging tool for plate-type butterfly valve of power transformer | |
| CN101776191B (en) | Construction method of joint seal of flanges of large-sized gas pipeline of blast furnace | |
| US20110241342A1 (en) | Pipe Repair Clamp with Self Pressurizing Seal | |
| CN204829115U (en) | Lag bolt type grout clamp sealing device | |
| CN212203472U (en) | Emergency connector | |
| JP5075785B2 (en) | Method for improving sealing degree of compressed fluid sealing device, and compressed fluid sealing device | |
| CN110118259B (en) | Wedge block type radial sealing ring | |
| KR100980766B1 (en) | Structure and method for preventing leaking water on water pipe | |
| CN208535443U (en) | Flange device for plugging | |
| JPH10227380A (en) | Flanged pipe joint | |
| CN222392329U (en) | Emergency plugging device for flange | |
| JP5561712B2 (en) | Anticorrosion repair method | |
| CN215721675U (en) | Leakage stopping device | |
| KR100453450B1 (en) | Mechanical Clamping Device | |
| CN205978429U (en) | Shovel tight type flange anchor clamps | |
| CN221839130U (en) | Flange with sealing groove | |
| RU228263U1 (en) | PIPE REPAIR CLAMP | |
| CN208474773U (en) | Leakage repairing clamp for pipeline elbow | |
| CN219413850U (en) | Pipeline device with protective structure |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination |