CN108543778A - A kind of pipe flushing method and tool - Google Patents
A kind of pipe flushing method and tool Download PDFInfo
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- CN108543778A CN108543778A CN201810737511.XA CN201810737511A CN108543778A CN 108543778 A CN108543778 A CN 108543778A CN 201810737511 A CN201810737511 A CN 201810737511A CN 108543778 A CN108543778 A CN 108543778A
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- bolt
- fork bolt
- fork
- flange
- flower basket
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B08—CLEANING
- B08B—CLEANING IN GENERAL; PREVENTION OF FOULING IN GENERAL
- B08B9/00—Cleaning hollow articles by methods or apparatus specially adapted thereto
- B08B9/02—Cleaning pipes or tubes or systems of pipes or tubes
- B08B9/027—Cleaning the internal surfaces; Removal of blockages
- B08B9/032—Cleaning the internal surfaces; Removal of blockages by the mechanical action of a moving fluid, e.g. by flushing
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Details Of Valves (AREA)
- Cleaning In General (AREA)
Abstract
A kind of pipe flushing method and tool belong to the technical field of power plant system flushing.Purging method includes：Step S01, removes check-valves valve deck, and installation stays on the support component between valve body and spool；Step S02 installs anti-flange in valve body on flange, pass through the anti-flanged joint temporary pipeline；Step S03, flushing pipe；Step S04 removes anti-flange, support component, restores valve deck installation.Inventive article is used for above-mentioned purging method, including the first fork bolt, the second fork bolt, flower basket bolt, locking nut, anti-flange.The present invention cleverly solves the problems, such as that the formal pipeline of system is connect with temporary pipeline by the access for changing check-valves, reduce the work such as cutting, polishing, welding and non-destructive testings of the formal a large amount of repeatability of pipeline before and after the water pressure test and system flush, accelerates system flush progress.
Description
Technical field
The technical field rinsed the present invention relates to power plant system more particularly to a kind of pipe flushing method and tool.
Background technology
It during domestic new nuclear power factory or thermal power plant's debugging start, is both needed to be rinsed system pipeline, removes installation rank
Section remains in the foreign matters such as impurity, iron filings, floating rust inside system pipeline.Conventional traditional method mostly uses temporary pipeline structure system
It unites flush loop, temporary pipeline is connected with permanent pipeline during Pipe installing, whole to carry out the water pressure test, and system turnover is debugged
After carry out system flush, temporary pipeline is removed after flushing again, restores the connection of formal pipeline.
By taking pump discharge pipe flushing as an example, it is generally the case that pump discharge is typically provided with check-valves, and foreign matter is avoided for protection pump
Damage, when system flush need to connect temporary pipeline will pump bypass, check-valves wouldn't install, temporary pipeline substitute check-valves with just
Formula pipeline connects, and is installed to recovery from temporary pipeline and shares nine processes, as shown in Figure 1.Process includes successively：
L processes 1：Pipeline centering；
L processes 2：Blind plate is installed, as next step hydraulic test of pipeline boundary；
L processes 3：The water pressure test is carried out, checks pipeline-weld quality；
L processes 4：Remove blind plate；
L processes 5：Temporary pipeline is installed；
L processes 6：It is rinsed；
L processes 7：Temporary pipeline restores；
L processes 8：Check-valves is installed；
L processes 9：Radiological survey X is carried out to newly generated weld seam（RT）.
The work such as more cutting, polishing, welding and radiological survey X involved in above-mentioned operation need to consume a large amount of people
Power, material resources, quantities is big and takes longer；If pipe diameter is larger, it is also necessary to larger installation space.
It is restricted by above-mentioned technique, the system flush range of each power plant is affected, and adds as pipe diameter is larger
Hot device extraction line can not be rinsed；In the case that system flush temporary pipeline is more, investment cost is more, it is whole debug into
Degree is also relatively slow.
In view of the actual state of system flush, the specific purpose tool that suitable temporary pipeline is connected with permanent pipeline is designed,
Under the premise of ensuring equipment safety, realizes drop expense, subtracts consumption, synergy, it is most important to accelerate debugging progress.
Invention content
The present invention is in view of the problems of the existing technology, it is proposed that it is a kind of can reduce formal pipeline connect with temporary pipeline and
The amount of resuming work provides more possible pipe flushing method, tools for pipe flushing scheme.
The technical scheme is that：
A kind of pipe flushing method of the present invention, including：
Step S01, removes check-valves valve deck, and installation stays on the support component between valve body and spool；
Step S02 installs anti-flange in valve body on flange, pass through the anti-flanged joint temporary pipeline；
Step S03, flushing pipe；
Step S04 removes anti-flange, support component, restores valve deck installation.
It being installed with for recovery process compared to traditional temporary pipeline, the present invention changes the runner and flow direction of check-valves,
Reduce the workload that formal pipeline connect and restores with temporary pipeline, such as reduces excessive cutting, polishing, welding and lossless
Detection etc. work, reduce manpower, financial resources input and shorten flushing construction period.
Preferably, the support component includes the first fork bolt, the second fork bolt, flower basket bolt, locking nut；
The step of support component installation, includes in the step S01：
Step S11, the first fork bolt of installation is on the cantilever of spool, and the second fork bolt of installation is on valve body；
Step S12 connects flower basket bolt between the first fork bolt and the second fork bolt, and adjusts flower basket bolt and make
One fork bolt, the second fork bolt are held out against between valve body and spool cantilever；
Step S13, locking nut of the installation for locking flower basket bolt on the first fork bolt or the second fork bolt；
Wherein, the first fork bolt, the second fork bolt, three axis axle center of the flower basket bolt are consistent.
Preferably, the step of support component is removed in the step S04 includes：
Step S41, come loose locking nut；
Step S42, adjustment flower basket bolt shortens the first fork bolt, the second fork bolt is held out against between valve body and spool cantilever
Distance；
Step S43 takes out flower basket bolt, locking nut, the first fork bolt, the second fork bolt.
A kind of tool for above-mentioned pipe flushing method, including the first fork bolt, the second fork bolt, gaily decorated basket spiral shell
Bolt, locking nut, anti-flange.
Preferably, the first fork bolt includes the first screw rod for being connect with flower basket bolt, to withstand on spool outstanding
First on arm shores component；Described first, which shores component, has the inclined end face contacted with spool cantilever surfaces forming face.
Preferably, the first of the first fork bolt shores component equipped with groove, for coordinating spool cantilever surfaces
The reinforcing rib of protrusion.
Preferably, the second fork bolt includes the second screw rod for being connect with flower basket bolt, to be sleeved on valve body convex
Play position second shores component.
Preferably, second screw rod and the described second angle for shoring between component are determined according to valve body structure.
Preferably, the screw thread of the internal thread of the flower basket bolt and the first fork bolt, the cooperation of the second fork bolt revolves
To opposite.
Preferably, the anti-flange includes and the anti-flange body of the middle flanged joint on valve body and is connected to described anti-
Short tube in flange body, the short tube is for connecting temporary pipeline.
The invention has the advantages that：
A kind of pipe flushing tool construction of the present invention is simple, convenient reliable, and the purging method realized using the tool can be promoted
To equipment such as other type valves or strainers.The present invention cleverly solves the formal pipeline of system by the access for changing check-valves
The problem of being connect with temporary pipeline reduces the cutting of the formal a large amount of repeatability of pipeline before and after the water pressure test and system flush, beats
The work such as mill, welding and non-destructive testing so that the range of the water pressure test and system flush increases, process is reduced, the duration is reduced.It is real
It tramples and shows through being resumed work using after above-mentioned specific purpose tool, needing to expend a large amount of manpowers, tool and the pipeline of duration originally, only
2 workers are needed work to can be completed in 1 day, hence it is evident that reduce workload and duration；Vapour is mounted on by using specific purpose tool of the present invention
In turbine extraction check valve, the flushing to high plus extraction line and drain water piping is realized, this is also tasting for the first time for nuclear power generating sets
Examination, expands the flushing range of secondary coolant circuit system, is that the water quality survey of follow-up unit starting reduces the time, and then shortens unit
Launching process.
Description of the drawings
Fig. 1 is traditional schematic diagram temporary pipeline installation and restore process；
Fig. 2 is the schematic diagram using the temporary pipeline installation and recovery process of inventive pipeline purging method, tool；
Fig. 3 is a kind of overall block flow diagram of pipe flushing method of the present invention；
Fig. 4 is the sub-process block diagram that support component is installed in Fig. 3；
Fig. 5 is the sub-process block diagram that support component is removed in Fig. 3；
Fig. 6 is that inventive article is installed on the cross-sectional view in an exemplary check-valves；
Fig. 7 is the structural schematic diagram of the first fork bolt in Fig. 6；
Fig. 8 is the structural schematic diagram of the second fork bolt in Fig. 6；
Fig. 9 is the structural schematic diagram of flower basket bolt in Fig. 6；
Figure 10 is the structural schematic diagram of locking nut in Fig. 6；
Figure 11 is the structural schematic diagram of anti-flange in Fig. 6.
Specific implementation mode
Following is a specific embodiment of the present invention in conjunction with the accompanying drawings, technical scheme of the present invention will be further described,
However, the present invention is not limited to these examples.
Fig. 1 shows traditional schematic diagram temporary pipeline installation and restore process.Check-valves wouldn't be installed when pipe flushing,
Temporary pipeline substitutes check-valves and is connect with formal pipeline, and being installed to recovery from temporary pipeline shares nine processes, in this process device
It is big and time-consuming and laborious that part needs to carry out work, the quantities such as repeatedly cutting, polishing, welding and radiological survey X.
The present invention proposes a kind of to reduce formal pipeline and connect with temporary pipeline and the pipe flushing side for the amount of resuming work thus
Method.
Before being rinsed, normal pipeline installation procedure is first carried out, includes pipeline centering successively；It welds and stops at pump discharge
Return valve；The water pressure test is carried out, checks pipeline-weld quality.
After completing normal pipeline installation procedure, it is rinsed.Such as Fig. 3, inventive pipeline purging method includes：
Step S01, removes check-valves valve deck, and installation stays on the support component between valve body and spool；
Step S02 installs anti-flange in valve body on flange, pass through the anti-flanged joint temporary pipeline；
Step S03, flushing pipe；
Step S04 removes anti-flange, support component, restores valve deck installation.
The support component includes the first fork bolt 1, the second fork bolt 2, flower basket bolt 3, locking nut 4.
Fig. 4 shows the installation procedure of support component in step S01, support component installation steps packet in the step S01
It includes：
Step S11, the first fork bolt 1 of installation is on the cantilever 61 of spool 6, and the second fork bolt 2 of installation is on valve body 5.
Step S12 connects flower basket bolt 3 between the first fork bolt 1 and the second fork bolt 2, and adjusts gaily decorated basket spiral shell
Bolt 3 is so that the first fork bolt 1, the second fork bolt 2 hold out against the length between valve body 5 and the cantilever 61 of spool 6.
Step S13, locking screw of the installation for locking flower basket bolt 3 on the first fork bolt 1 or the second fork bolt 2
Mother 4.
Such as Fig. 6, the present invention is the assembling structure for exemplifying support component and anti-flange with swing check valve.First,
Come loose check-valves valve deck bolt, removes valve deck；Then, according to connection type shown in Fig. 6 that support component and anti-flanged joint is good；
Secondly, the length of the shortening support component of blue bolt 3 is spent in adjustment so that the first fork bolt 1 is contacted with cantilever 61, the second fork spiral shell
Bolt 2 and the protrusion 51 of valve body 5 coordinate.And ensure the first fork bolt 1, the second fork bolt 2, the flower basket bolt
3 three axis axle center are consistent, i.e. three axis shaft cores are on the same line.Then, flower basket bolt 3 is adjusted with suitable spanner, makes support
Component is stretched to both sides, i.e., holds out against the first fork bolt 1, the second fork bolt 2 between valve body 5 and the cantilever 61 of spool 6,
Can not exert oneself excessive damage spool.After holding out against, locking nut 4 is screwed.Finally, gasket and the anti-flange with short tube are installed, pressed
It is required that torque fastening, then connect temporary pipeline.
Above-mentioned support component and anti-flange are being installed after valve body, is being rinsed.Flushing finishes, by support component and instead
Flange is removed from valve body.Fig. 5 shows the dismounting flow of support component in step S04, and support component is torn open in the step S04
Except the step of include：
S41, come loose locking nut 4；
S42, adjustment flower basket bolt 3 shortens the first fork bolt 1, the second fork bolt 2 is held out against in valve body 51 and 6 cantilever 61 of spool
The distance between；
S43 takes out flower basket bolt 3, locking nut 4, the first fork bolt 1, the second fork bolt 2.
When being removed, anti-flange and support component are removed successively.Specifically, first, come loose valve body bolt, removes band
The anti-flange of short tube 72；Secondly, it is come loose locking nut 4 using suitable spanner；Then, gaily decorated basket spiral shell is adjusted using suitable spanner
Bolt 3 shortens the length of support component；Later, support component is taken out.After removing flange and support component, it is also necessary to check valve
Internal and sealing surface is intact, clears up foreign matter.Then, gasket and valve deck are installed, torque fastening as required.
Support component, anti-flange used in above-mentioned flushing flow are the tool of pipe flushing special designs.Specifically, scheme
7-11 sequentially show the first fork bolt 1, the second fork bolt 2, flower basket bolt 3, locking nut 4, anti-flange structure show
It is intended to.
Such as Fig. 7, the first fork bolt 1 is process using stainless steel material.The first fork bolt 1 includes the
One screw rod 11 and first shores component 12.First screw rod 11 has external screw thread, for being threadedly coupled with flower basket bolt 3.The
The length of one screw rod 11 need to suitably be selected according to valve specification, long to influence the installation of pipe flushing tool, too short meeting shadow
Ring the adjustable range of flower basket bolt.Described first shores component for block parts, has the screw thread being connect with the first screw rod 11
Also there is the inclined end face contacted with the 61 surface forming face of cantilever of spool 6, the inclined end face can shore component convenient for first in hole
The cantilever 61 in spool 6 can more effectively be held out against.In addition, described first shores component and is provided with one along cantilevered orientation in its end face center
The groove 13 for determining depth and width is avoided interfering with the reinforcing rib of cantilever surfaces protrusion, should be designed according to specific valve mechanism
The angle of inclination of inclined end face and the groove of suitable dimension.
Such as Fig. 8, the second fork bolt 2 is process using stainless steel material.The second fork bolt 2 includes the
Two screw rods 21 and second shore component 22.Second screw rod 21 has external screw thread, for being threadedly coupled with flower basket bolt 3.The
The length of two screw rods need to suitably be selected according to valve specification, and the long pipe flushing tool that can influence is installed, too short to influence
The adjustable range of flower basket bolt.Described second shores component 22 for rectangular stainless steel plate, and intermediate trepanning is sleeved on valve body 5
Raised 51 positions, plate thickness 10mm or so, pore size and shape are matched with valve body protrusion, no required precision.Described second
Component to be shored with the second screw rod 21 to weld together, the angle between screw axis and stainless steel plate is determined according to valve body structure,
Ensure the first fork bolt 1 and the second fork bolt 2 respectively at the cantilever 61 of valve body 5 and spool 6 be adjacent to jail and screw rod with
3 shaft core of flower basket bolt is consistent.
Such as Fig. 9, the flower basket bolt 3 is process using stainless steel material, is connect for regular hexahedron or cylinder strap wrenches
Mouthful, inside center runs through, tapping thread and the first fork bolt 1,2 screw-thread fit of the second fork bolt.Wherein, flower basket bolt 3
It is opposite with the thread rotary orientation that the first fork bolt 1, the second fork bolt 2 coordinate, that is to say, that when flower basket bolt 3 rotates, two
Fork bolt should move in opposite directions or on the contrary.
Such as Figure 10, the locking nut 4 is process using stainless steel material, standard component can also be used, it is ensured that with first
Fork bolt 1 or the second correctly cooperation of fork bolt 2.The locking nut 4 is sheathed on the first fork bolt 1 or institute
It states on the second fork bolt 2, locks flower basket bolt 3.
Such as Figure 11, the anti-flange includes the anti-flange body 71 being set on valve body 5 and is connected to the anti-flange body
Short tube 72 on 71.The anti-flange body 71 is simple steel flange, is welded with short tube 72.The flange body 71 of anti-flange
It is matchedly connected by bolt and flange in valve body, centre installs gasket seal additional, and short tube 72 is for connecting temporary pipeline.
Specific purpose tool connection as shown in Figure 2 is carried out according to above-mentioned pipe flushing method and tool and restores temporary pipeline work
Sequence.Compared to process shown in Fig. 1, the process completed using the present invention is only 6, specially：
Process 1：Pipeline centering；
Process 2：Welded check valve；
Process 3：The water pressure test is carried out, checks pipeline-weld quality；
Process 4：Remove check-valves valve deck, installation special tool；
Process 5：It is rinsed；
Process 6：Specific purpose tool is removed, valve deck installation is restored.
Wherein process 1-3 is normal pipeline installation procedure, and only 3 procedures are the installation and recovery for temporary pipeline.
The present invention using design specific purpose tool, i.e., anti-flange, locking nut 4, flower basket bolt 3, the first fork bolt 1,
Second fork bolt 2, and accordingly use step, cleverly by change check-valves access solve the formal pipeline of system with
The problem of temporary pipeline connects, reduce the cutting, polishing of the formal a large amount of repeatability of pipeline before and after the water pressure test and system flush,
The work such as welding and non-destructive testing so that the range of the water pressure test and system flush increases, process is reduced, the duration is reduced.Practice
Show through being resumed work using after above-mentioned specific purpose tool, needing to expend a large amount of manpowers, tool and the pipeline of duration originally, it is only necessary to 2
Work can be completed in 1 day in a worker, hence it is evident that reduces workload and duration；Also height plus extraction line and drain water piping are rushed
It washes, this is also the trial for the first time of nuclear power generating sets, expands the flushing range of secondary coolant circuit system, is the water quality tune of follow-up unit starting
The whole reduction time, and then shorten the launching process of unit.
Designed specific purpose tool is simple in structure, convenient reliable in the present invention, and the tool and its principle can extend to it
The equipment such as its type valve or strainer.Particular technique effect is as follows：
1) all component materials of the specific purpose tool are common, make simply, the assembly and fixed form with valve are firm, not will produce
Loose releasing part enters system.It can ensure that check valve spool is not damaged with sealing surface of seat, certain pretightning force the case where
Ensure No leakage.
2) but the present invention is not limited to above-described embodiments, and such as various sizes of valve, the size of specific purpose tool can
Appropriate adjustment；If the runner of change strainer is thought, only with flanged (FLGD) short tube.
It should be understood by those skilled in the art that the embodiment of the present invention shown in foregoing description and attached drawing is only used as illustrating
And it is not intended to limit the present invention.The purpose of the present invention completely effectively realizes.The function and structural principle of the present invention is in reality
It applies and shows and illustrate in example, under without departing from the principle, embodiments of the present invention can have any deformation or modification.
Claims (10)
1. a kind of pipe flushing method, which is characterized in that including：
Step S01, removes check-valves valve deck, and installation stays on the support component between valve body and spool；
Step S02 installs anti-flange in valve body on flange, pass through the anti-flanged joint temporary pipeline；
Step S03, flushing pipe；
Step S04 removes anti-flange, support component, restores valve deck installation.
2. a kind of pipe flushing method according to claim 1, which is characterized in that the support component includes the first fork
Bolt, the second fork bolt, flower basket bolt, locking nut；The step of support component installation, includes in the step S01：
Step S11, the first fork bolt of installation is on the cantilever of spool, and the second fork bolt of installation is on valve body；
Step S12 connects flower basket bolt between the first fork bolt and the second fork bolt, and adjusts flower basket bolt and make
One fork bolt, the second fork bolt are held out against between valve body and spool cantilever；
Step S13, locking nut of the installation for locking flower basket bolt on the first fork bolt or the second fork bolt；
Wherein, the first fork bolt, the second fork bolt, three axis axle center of the flower basket bolt are consistent.
3. a kind of pipe flushing method according to claim 2, which is characterized in that support component is torn open in the step S04
Except the step of include：
Step S41, come loose locking nut；
Step S42, adjustment flower basket bolt shortens the first fork bolt, the second fork bolt is held out against in step valve body and spool cantilever
The distance between；
Step S43 takes out flower basket bolt, locking nut, the first fork bolt, the second fork bolt.
4. a kind of tool for pipe flushing method one of described in the claims 1-3, which is characterized in that including the first fork
Terminal bolt, the second fork bolt, flower basket bolt, locking nut, anti-flange.
5. tool according to claim 4, which is characterized in that the first fork bolt includes for connecting with flower basket bolt
The first screw rod for connecing, first withstood on spool cantilever shore component；Described first, which shores component, has and spool cantilever surfaces
The inclined end face of forming face contact.
6. tool according to claim 5, which is characterized in that the first of the first fork bolt shores component equipped with recessed
Slot, for coordinating the reinforcing rib of spool cantilever surfaces protrusion.
7. tool according to claim 4, which is characterized in that the second fork bolt includes for connecting with flower basket bolt
The second screw rod for connecing is sleeved on the second of valve body raised position and shores component.
8. tool according to claim 7, which is characterized in that second screw rod and described second is shored between component
Angle is determined according to valve body structure.
9. tool according to claim 4, which is characterized in that the internal thread of the flower basket bolt and the first fork bolt,
The thread rotary orientation of second fork bolt cooperation is opposite.
10. tool according to claim 4, which is characterized in that the anti-flange includes and the middle flanged joint on valve body
Anti- flange body and the short tube that is connected in the anti-flange body, the short tube is for connecting temporary pipeline.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810737511.XA CN108543778B (en) | 2018-07-06 | 2018-07-06 | Pipeline flushing method and tool |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810737511.XA CN108543778B (en) | 2018-07-06 | 2018-07-06 | Pipeline flushing method and tool |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN108543778A true CN108543778A (en) | 2018-09-18 |
| CN108543778B CN108543778B (en) | 2020-06-26 |
Family
ID=63493471
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201810737511.XA Active CN108543778B (en) | 2018-07-06 | 2018-07-06 | Pipeline flushing method and tool |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN108543778B (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113546928A (en) * | 2021-07-15 | 2021-10-26 | 中国核电工程有限公司 | Temporary washing tool, mounting tool and method and cleaning method of pipeline structure |
| US20220212237A1 (en) * | 2021-01-04 | 2022-07-07 | Saudi Arabian Oil Company | Simultaneously unblocking multiple valve fittings |
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| CN101637768A (en) * | 2009-08-26 | 2010-02-03 | 中冶集团华冶资源开发有限责任公司 | Pipeline cleaning method |
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| WO2017135843A3 (en) * | 2016-02-04 | 2017-10-05 | Игорь Васильевич БОЕВ | Pipeline connection assembly |
| CN206555626U (en) * | 2017-02-22 | 2017-10-13 | 广东核电合营有限公司 | Isolate the device of intervention in a kind of Chemical cleaning valve |
| CN207500556U (en) * | 2017-11-30 | 2018-06-15 | 大连埃斯流体技术有限公司 | A kind of check-valves |
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- 2018-07-06 CN CN201810737511.XA patent/CN108543778B/en active Active
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN101637768A (en) * | 2009-08-26 | 2010-02-03 | 中冶集团华冶资源开发有限责任公司 | Pipeline cleaning method |
| CN104415951A (en) * | 2013-08-21 | 2015-03-18 | 中国广核集团有限公司 | Method for washing oil adjusting system of steam turbine at nuclear power station |
| WO2017135843A3 (en) * | 2016-02-04 | 2017-10-05 | Игорь Васильевич БОЕВ | Pipeline connection assembly |
| CN205777607U (en) * | 2016-05-26 | 2016-12-07 | 福建省第五建筑工程公司 | Tool bracing frame in a kind of equipment box |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20220212237A1 (en) * | 2021-01-04 | 2022-07-07 | Saudi Arabian Oil Company | Simultaneously unblocking multiple valve fittings |
| US11839908B2 (en) * | 2021-01-04 | 2023-12-12 | Saudi Arabian Oil Company | Simultaneously unblocking multiple valve fittings |
| CN113546928A (en) * | 2021-07-15 | 2021-10-26 | 中国核电工程有限公司 | Temporary washing tool, mounting tool and method and cleaning method of pipeline structure |
Also Published As
| Publication number | Publication date |
|---|---|
| CN108543778B (en) | 2020-06-26 |
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