CN203230975U - Pipeline connection device - Google Patents
Pipeline connection device Download PDFInfo
- Publication number
- CN203230975U CN203230975U CN 201320178799 CN201320178799U CN203230975U CN 203230975 U CN203230975 U CN 203230975U CN 201320178799 CN201320178799 CN 201320178799 CN 201320178799 U CN201320178799 U CN 201320178799U CN 203230975 U CN203230975 U CN 203230975U
- Authority
- CN
- China
- Prior art keywords
- pipeline
- tube head
- welding
- pipe
- stainless steel
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
Links
- 238000003466 welding Methods 0.000 claims abstract description 51
- 239000010935 stainless steel Substances 0.000 claims description 32
- 229910001220 stainless steel Inorganic materials 0.000 claims description 32
- 239000004033 plastic Substances 0.000 claims description 10
- 239000000463 material Substances 0.000 claims description 8
- 239000002131 composite material Substances 0.000 claims description 7
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 claims description 6
- 229910052786 argon Inorganic materials 0.000 claims description 3
- 230000008878 coupling Effects 0.000 claims description 3
- 238000010168 coupling process Methods 0.000 claims description 3
- 238000005859 coupling reaction Methods 0.000 claims description 3
- 238000005260 corrosion Methods 0.000 abstract description 21
- 230000007797 corrosion Effects 0.000 description 14
- 238000007789 sealing Methods 0.000 description 12
- 229910000831 Steel Inorganic materials 0.000 description 9
- 239000011324 bead Substances 0.000 description 9
- 239000010959 steel Substances 0.000 description 9
- 238000005516 engineering process Methods 0.000 description 7
- 239000011248 coating agent Substances 0.000 description 6
- 238000000576 coating method Methods 0.000 description 6
- 239000007789 gas Substances 0.000 description 6
- 229910000975 Carbon steel Inorganic materials 0.000 description 5
- 238000002679 ablation Methods 0.000 description 5
- 239000010962 carbon steel Substances 0.000 description 5
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 5
- 230000002421 anti-septic effect Effects 0.000 description 3
- 238000010276 construction Methods 0.000 description 3
- 230000006378 damage Effects 0.000 description 3
- 241000277275 Oncorhynchus mykiss Species 0.000 description 2
- 230000015556 catabolic process Effects 0.000 description 2
- 238000000354 decomposition reaction Methods 0.000 description 2
- 238000006731 degradation reaction Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 230000003628 erosive effect Effects 0.000 description 2
- 238000005530 etching Methods 0.000 description 2
- 230000002401 inhibitory effect Effects 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 239000003921 oil Substances 0.000 description 2
- 239000013535 sea water Substances 0.000 description 2
- 208000037656 Respiratory Sounds Diseases 0.000 description 1
- 239000002253 acid Substances 0.000 description 1
- 150000007513 acids Chemical class 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 230000008901 benefit Effects 0.000 description 1
- 239000003818 cinder Substances 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000009977 dual effect Effects 0.000 description 1
- 239000012467 final product Substances 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 239000011159 matrix material Substances 0.000 description 1
- 230000002503 metabolic effect Effects 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 244000005700 microbiome Species 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 238000000465 moulding Methods 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 239000006223 plastic coating Substances 0.000 description 1
- 238000009428 plumbing Methods 0.000 description 1
- 239000004800 polyvinyl chloride Substances 0.000 description 1
- 239000003755 preservative agent Substances 0.000 description 1
- 230000002335 preservative effect Effects 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 230000002787 reinforcement Effects 0.000 description 1
- 230000008439 repair process Effects 0.000 description 1
- 239000011435 rock Substances 0.000 description 1
- 239000002689 soil Substances 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
- 238000007751 thermal spraying Methods 0.000 description 1
Images
Landscapes
- Arc Welding In General (AREA)
- Butt Welding And Welding Of Specific Article (AREA)
Abstract
The utility model provides a pipeline connection device. The pipeline connection device comprises a first pipeline, a second pipeline, a first pipe head and a second pipe head, wherein the first pipe head is butted with the pipe ends of the first pipeline; the second pipe head is butted with the pipe ends of the second pipeline; the first pipe head and the second pipe head are butted in a matching manner; corresponding slopes are arranged at the joints of the first pipeline, the first pipe head, the second pipeline and the second pipe head respectively; anti-corrosion layers are formed on the inner and outer surfaces of both the first pipeline and the second pipeline, so that the pipeline connection device realizes easy welding operation of the butted openings, guarantees quality of the welding joint, ensures the completion of the anti-corrosion layers, improves service life of the anti-corrosion pipeline and increases work efficiency.
Description
Technical field
The utility model relates to anti-corrosion pipeline and connects technical field of sealing technology, particularly a kind of assembling pipe joint.
Background technique
Pipeline is the device for delivery of the fluid of gas, liquid or band solid particle that is connected into pipe, pipe coupling and valve etc.Because pipeline can suffer the corrosion of soil, air and fed sheet of a media (oil, rock gas etc.), so need carry out preservative treatment to pipeline.Avoiding causing the leakage of media such as oil, gas when the media such as transferring oil, gas, and cause transportation to be interrupted and befouling environment, even the harm such as fire that may cause.
Pipeline corrosion protection refers to the measure for slowing down or preventing pipeline under the chemistry of inside and outside medium, electrochemical action or be etched and gone bad by the metabolic activity of microorganism.
What existing pipeline adopted is composite metal plastic pipe, it is to be that the coated special plastic material thermal spraying of matrix, inwall once forms effective internal and external anti-corrosive coating by steel pipe, after curing and plasticizing, form even, fine and close, the smooth plastic coating of one deck at the metallic conduit inner and outer surface, become a kind of novel steel-plastic composite pipe.Present this aseptic technic is domestic state-of-the-art technology, it integrates the resistance to chemical corrosion of the superior mechanical property of steel and macromolecular material brilliance, greatly prolonged the working life of steel pipe, had unique resistance to acids and bases, resistance to wear, do not have fouling, help advantage such as lubricated, anti-negative pressure.Composite steel tube has superior corrosion resistance and smaller surface friction drag, is highly suitable for the conveying of media such as plumbing, seawater, warm water, oil, gas, and PVC (PVC) plastic-coated steel is applicable to the conveying of media such as draining, seawater, oil, gas.
But, the internal and external anti-corrosive steel-plastic composite pipe is the easiest in actual applications, and what go wrong is the interface position, and in small-bore (≤DN600) inside and outside plastic-coated steel is owing to be subjected to the pipe diameter size restrictions, manually can't enter the repaired mouth that pipe interior carries out connection part, therefore design and develop in the small-bore pipeline Placement that need not internal joint patch significant.Small-bore at present (≤DN600) Placement of plastic-coated steel mainly contains mode and double-sealing welding dual modes such as the welding of inner liner stainless steel head.
Please refer to shown in Figure 1ly, Fig. 1 is inner liner stainless steel welded structure schematic representation in the prior art.The welding of inner liner stainless steel head has very high antiseptic property, but found to exist problems in actual applications: the inwall stainless steel is very thin, and counterpart is very difficult, and is loaded down with trivial details not easy to operate, interior welding bead is stainless steel and outer welding bead is Ordinary Steel, forms very big internal stress; Because internal stress is bigger, interior stainless steel welding bead expansion ratio is bigger than carbon steel, so welding bead is very obvious to temperature variation, the welding bead outer wall often occurs and crackle occurs, needs repeatedly repair welding situation.Weld bond is withstand voltage can not to surpass 2.0MPa, and because inner liner stainless steel is thinner, pressure is excessive to cause stainless steel generation plasticity hole enlargement distortion, easily causes moulding pull-up and falls, even cause whole pipe to mould pull-up falling.This situation has had precedent.The local material capability of inner liner stainless steel welding bead changes, and causes corrosion resistance to reduce greatly, is difficult to satisfy requirement for anticorrosion, and the antiseptic property grade is general.The welding bead place is because easily going wrong, thus the general low pressure 2.0MPa of water delivery following about 15 years; High pressure is greater than the anticorrosion life-span of 2.0MPa shorter (aqueduct).Through market test, this kind Placement can't guarantee the Security of weld bond.
Please refer to shown in Figure 2ly, Fig. 2 is double-sealing welded structure schematic representation in the prior art.The double-sealing welding is played the effect of double-sealing with steel pipe 21 by using external welding and inside " O " type rubber seal 22, and insulated tank 23 does not have thermoinsulation material for air groove.This kind weld bond voltage withstand class height, antiseptic property is good, make things convenient for counterpart during welding, the common welding rod welding gets final product, when carrying out the welding of two flanges, " O " type rubber seal 22 that seals is ablated because of the heat conduction easily but in actual applications,, and then cause fed sheet of a media to infiltrate pipeline junction and cause corrosion, greatly reduce the working life of pipeline.
In summary, the double-sealing technology is when welding, producing a large amount of heat can be directly by insulated tank 23 through " O " type rubber seal 22, and then cause " ablation " of rubber seal 22, even the breakoff phenomenon that causes because of " ablation " also often takes place in undercoating 24, bring potential risk to pipe applications, directly influenced the working life of anti-corrosion pipeline.And the inner liner stainless steel Placement is loaded down with trivial details not easy to operate, and interior welding bead is stainless steel and outer welding bead is straight carbon steel, forms very big internal stress, and welding performance is poor; Inner liner stainless steel is very difficult because of the very thin counterpart of wall thickness, and the site operation welding efficiency is extremely low.
How a kind of assembling pipe joint is provided, and can overcome above-mentioned technical problem becomes the technical problem that needs to be resolved hurrily.
The model utility content
The technical problems to be solved in the utility model is how a kind of assembling pipe joint is provided, and can overcome pipeline counterpart difficulty, and the site operation welding efficiency is extremely low and because pipeline junction is corroded, and reduces the problems such as working life of pipeline.
For solving the problems of the technologies described above, the utility model provides a kind of assembling pipe joint, comprising: first pipeline, second pipeline, first tube head, second tube head; Wherein, described first tube head docks with the pipe end of described first pipeline; Described second tube head docks with the pipe end of described second pipeline, and described first tube head docks with described second tube head coupling, and is provided with corresponding groove in the joint of described first pipeline, first tube head, second pipeline, second tube head respectively; Described first pipeline and the second pipeline inner and outer surface have anticorrosive coat.
Preferably, described groove is between 20 to 30 degree.
Preferably, described first tube head and the second tube head material are stainless steel, and length is between between the 70mm to 150mm.
Preferably, described first pipeline and second pipeline are steel-plastic composite pipes.
Preferably, the caliber of described first pipeline and second pipeline is≤DN600.
Preferably, the inner and outer surface of described first tube head and second tube head has anticorrosive coat.
Preferably, connect by welding manner between described first pipeline, second pipeline, first tube head, second tube head.
Preferably, state the mode that welding manner is argon arc welding.
A kind of assembling pipe joint that the utility model provides, pipeline pipe end liner thin-wall stainless steel structure is become the welded stainless steel pipe header structure, counterpart was easy when on-the-spot pipeline connected, easier assurance weldquality, weld bond voltage withstand class height, and the heat of butt welding welding through the Stainless Steel Tube head length spend cross after, the conduction heat erosion undercoating of can not reburning, guaranteed internally coated complete, improved the working life of anti-corrosion pipeline, can be applicable to high pressure pipe line and connect, and guarantee pipeline and tube head joint root through welding by the cut that arranges, reinforcement is not too high, and obtains good appearance of weld and be convenient to scarfing cinder.
It is more reliable with respect to the inner liner stainless steel weld seam to adopt the stainless steel tube head to connect welding quality, and technology is simpler, and efficiency of construction is improved greatly.And the hidden danger of quality of ablation rubber seal when having welding with respect to existing double-sealing welding, adopt the stainless steel tube head to connect and to guarantee that coated inside can be because of welding heat ablative degradation coated inside, thereby guarantee the etching problem that carbon steel can not bring with direct contact of water in the pipe, this kind connection set does not have hidden danger of quality, joint is more safe and reliable, and the weld bond durability can reach more than 50 years in aqueduct is used.
Description of drawings
In order to be illustrated more clearly in the utility model embodiment and technological scheme of the prior art, to do to introduce simply to the accompanying drawing of required use in embodiment and the description of the Prior Art below, apparently, accompanying drawing in describing below only is embodiments more of the present utility model, for those of ordinary skills, under the prerequisite of not paying creative work, can also obtain other accompanying drawing according to these accompanying drawings.
Fig. 1 is inner liner stainless steel welded structure schematic representation in the prior art;
Fig. 2 is double-sealing welded structure schematic representation in the prior art;
Fig. 3 is a kind of assembling pipe joint STRUCTURE DECOMPOSITION figure that the utility model provides;
Fig. 4 is a kind of assembling pipe joint structural representation that the utility model provides.
Embodiment
To engage the accompanying drawing among the utility model embodiment below, the technological scheme among the utility model embodiment is clearly and completely described, obviously, described embodiment only is the utility model part embodiment, rather than whole embodiments.Based on the embodiment in the utility model, those of ordinary skills are not making the every other embodiment who obtains under the creative work prerequisite, all belong to the scope of the utility model protection.
Please refer to shown in Figure 3ly, Fig. 3 is a kind of assembling pipe joint STRUCTURE DECOMPOSITION figure that the utility model provides.
A kind of assembling pipe joint that the utility model provides comprises: first pipeline 1, second pipeline 2, first tube head 3, second tube head 4; Wherein, described first tube head 3 docks with the pipe end of described first pipeline 1; The pipe end of described relatively first pipeline 1 of described second tube head 4 docks with the pipe end of described second pipeline 2, described first tube head 3 docks with described second tube head 4, and is provided with corresponding in the joint of described first pipeline 1, first tube head 3, second pipeline 2, second tube head 4 respectively
Groove 5;Described first pipeline 1 and second pipeline, 2 inner and outer surface have anticorrosive coat 6.
Please in conjunction with Fig. 3, with reference to shown in Figure 4, Fig. 4 is a kind of assembling pipe joint structural representation that the utility model provides.
At the assembling pipe joint that adopts the utility model to provide, when connecting at the scene, first tube head 3 is connected the pipe end of first pipeline 1, second tube head 4 is connected the pipe end of described second pipeline 2, with first tube head 3 and 4 butt joints of second tube head, weld together with stainless steel electrode afterwards.Because the pipe end of first and second pipelines 2 has adopted first tube head 3 and second tube head 4 respectively, the length of described first tube head 3 and second tube head 4 is more than or equal to 70mm, therefore, the welding heat that produces in when welding corrosion-inhibiting coating on first pipeline 1 and second pipeline 2 of can not ablating again after by the heat conduction path (length) of first tube head 3 and second tube head 4, therefore, the Placement of using first tube head 3 and second tube head 4 can not damage the anticorrosive coat of first pipeline 1 and second pipeline, 2 inwalls, thereby guaranteed the integrity of first pipeline 1 and second pipeline, 2 inner wall anti-corrosive layers, the scene need not internal joint patch and has solved medium effectively to the Corrosion of Pipeline problem, has improved site operation efficient greatly; And first tube head 3 and second tube head 4 not only corrosion-resistant, and safety and sanitary have guaranteed that water quality reaches sanitary standard in the aqueduct.
For the ease of first pipeline 1 and first tube head 3, second pipeline 2 and second tube head 4, first tube head 3 is connected with second tube head 4, is provided with corresponding groove in the joint of described first pipeline, first tube head, second pipeline, second tube head respectively, in order to reach better welding effect.The angle of described groove 5 can be arranged between 20 to 30 degree, and it is more firm to make that pipeline connects.
The assembling pipe joint that the utility model provides, wherein, the caliber of described first pipeline 1 and second pipeline 2 is≤DN600.
First pipeline described in the utility model and second pipeline can be steel-plastic composite pipes.
The assembling pipe joint that provides, first tube head 3 and second tube head 4 can adopt stainless steel electrode to be welded on the two ends of first pipeline 1 and second pipeline 2 with the mode of argon arc welding respectively, and first pipeline 1 and second pipeline 2 are carried out the corrosion resistant coating construction of inner and outer surface by the corrosion protection technology of standard.
Certain above-mentioned Placement only is a kind ofly for example in fact to be not limited to above-mentionedly when implementing to connect, and any other can all belong to protection domain of the present utility model with first pipeline 1, first tube head 3, second pipeline 2, second tube head, 4 ways of connecting.
A kind of assembling pipe joint that the utility model provides, solve original inner liner stainless steel and connected the counterpart difficulty, and be difficult to guarantee the quality of weld bond, and double sealing structure is when welding, welding heat may cause the ablation of " O " type rubber ring, and the destruction sealing configuration is the hidden danger of quality continuation development of sealing place and then the corrosion that can cause the pipe end carbon steel material.
The utility model becomes the welded stainless steel pipe header structure with pipe end liner thin-wall stainless steel structure, counterpart was easy when on-the-spot pipeline connected, easier assurance weldquality, weld bond voltage withstand class height, and the heat of butt welding welding through the Stainless Steel Tube head length spend cross after, the conduction heat erosion undercoating of can not reburning has been guaranteed internally coated complete, improved the working life of anti-corrosion pipeline, can be applicable to high pressure pipe line and connect.And, because the pipeline pipe end has used the tube head of stainless steel, thus good corrosion resisting property had, so pipeline junction need not internal joint patch.
It is more reliable with respect to the inner liner stainless steel weld seam to adopt the stainless steel tube head to connect welding quality, and technology is simpler, and efficiency of construction is improved greatly.And the hidden danger of quality of ablation rubber seal when having welding with respect to existing double-sealing welding, adopt the stainless steel tube head to connect and to guarantee that coated inside can be because of welding heat ablative degradation coated inside, thereby guarantee the etching problem that carbon steel can not bring with direct contact of water in the pipe, this kind connection set does not have hidden danger of quality, joint is more safe and reliable, and the weld bond durability can reach more than 50 years in aqueduct is used.
The preferred implementation of a kind of assembling pipe joint that the above only provides for the utility model does not constitute the restriction to the utility model protection domain.The mode that number of components among this embodiment is not limited to adopt among the embodiment; any any modification of within spirit of the present utility model and principle, doing, be equal to and replace and improvement etc., all should be included within the claim protection domain of the present utility model.
Claims (8)
1. an assembling pipe joint is characterized in that, comprising: first pipeline, second pipeline, first tube head, second tube head; Wherein, described first tube head docks with the pipe end of described first pipeline; Described second tube head docks with the pipe end of described second pipeline, and described first tube head docks with described second tube head coupling, and is provided with corresponding groove in the joint of described first pipeline, first tube head, second pipeline, second tube head respectively; Described first pipeline and the second pipeline inner and outer surface have anticorrosive coat.
2. device according to claim 1 is characterized in that, described groove is between 20 to 30 degree.
3. device according to claim 1 is characterized in that, described first tube head and the second tube head material are stainless steel, and length is more than or equal to 70mm.
4. device according to claim 1 is characterized in that, described first pipeline and second pipeline are steel-plastic composite pipes.
5. device according to claim 1 is characterized in that, the caliber of described first pipeline and second pipeline is≤DN600.
6. device according to claim 1 is characterized in that, the inner and outer surface of described first tube head and second tube head has anticorrosive coat.
7. device according to claim 1 is characterized in that, connects by welding manner between described first pipeline, second pipeline, first tube head, second tube head.
8. device according to claim 6 is characterized in that, described welding manner is the mode of argon arc welding.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201320178799 CN203230975U (en) | 2013-04-10 | 2013-04-10 | Pipeline connection device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201320178799 CN203230975U (en) | 2013-04-10 | 2013-04-10 | Pipeline connection device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203230975U true CN203230975U (en) | 2013-10-09 |
Family
ID=49287102
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201320178799 Expired - Lifetime CN203230975U (en) | 2013-04-10 | 2013-04-10 | Pipeline connection device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN203230975U (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105626985A (en) * | 2015-05-03 | 2016-06-01 | 延安中海石油工程技术开发有限公司 | Stainless steel heat avoiding connector and method for connecting anti-corrosion steel pipes by using stainless steel heat avoiding connector |
| CN106090469A (en) * | 2016-06-17 | 2016-11-09 | 高彬 | Conduit coupling and include the pipe network of this conduit coupling, pipe connecting method |
| CN107191743A (en) * | 2017-07-18 | 2017-09-22 | 山东胜利长龙管道科技有限公司 | A kind of steel pipe two-part exempts from the dead mouth of interior corrosion-resistanting interpolating port and connects head method |
-
2013
- 2013-04-10 CN CN 201320178799 patent/CN203230975U/en not_active Expired - Lifetime
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105626985A (en) * | 2015-05-03 | 2016-06-01 | 延安中海石油工程技术开发有限公司 | Stainless steel heat avoiding connector and method for connecting anti-corrosion steel pipes by using stainless steel heat avoiding connector |
| CN106090469A (en) * | 2016-06-17 | 2016-11-09 | 高彬 | Conduit coupling and include the pipe network of this conduit coupling, pipe connecting method |
| CN107191743A (en) * | 2017-07-18 | 2017-09-22 | 山东胜利长龙管道科技有限公司 | A kind of steel pipe two-part exempts from the dead mouth of interior corrosion-resistanting interpolating port and connects head method |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN203230985U (en) | Pipeline sealing connection device | |
| CN103008988B (en) | The method of internal joint patch weldering exempted from by a kind of anticorrosive steel pipeline | |
| CN104405975A (en) | Steel pipe with bell and spigot joints | |
| CN203230975U (en) | Pipeline connection device | |
| CN104075047A (en) | Tungsten alloy plated pipeline welding port connecting method | |
| CN103912740B (en) | Nondestructive welding joint for long-distance pipeline steel pipe with inner coating | |
| CN209041794U (en) | Hermetically sealed heat-insulated welding pressure composite steel tube | |
| CN203230984U (en) | Flange type lining pipeline connecting device | |
| CN201289423Y (en) | Leak detection structure for composite board equipment | |
| CN202580486U (en) | Electric-welding connecting flare-type joint of small-bore plastic-coated steel pipe | |
| CN206054999U (en) | A kind of heavy caliber plastic-coated steel flexibility socket joint fast connector | |
| CN201836559U (en) | Thread seal joint for connecting bimetal tube with external diameter being not less than 30mm | |
| CN204493936U (en) | The joint connecting structure of anticorrosion composite pipe | |
| CN204805768U (en) | Anticorrosive sleeve pipeline of allumen connects | |
| CN106764110A (en) | A kind of inside and outside bilateral stainless steel corrosion-resistant water supply and sewerage pipeline and its manufacture method | |
| CN100554745C (en) | The annular sealing connection method of lining pipe | |
| CN204664650U (en) | For connecting the liner sliding sleeve of two straight tube ends | |
| CN203413252U (en) | Device for connecting inner and outer anticorrosive steel plastic composite pipes | |
| CN204554199U (en) | Socket joint jointing type elbow | |
| CN201615318U (en) | Metal anti-corrosion pipeline connector | |
| CN204647602U (en) | A kind of composite bimetal pipe pipe end linkage structure | |
| CN204300573U (en) | A kind of bimetallic composite reducing crossover sub | |
| CN201137793Y (en) | Steel pipe welding interface anti-corrosive protection joint | |
| CN203477637U (en) | Bimetal composite pipe | |
| CN102734574A (en) | Fitting assembly and safety lock line connection system including the assembly |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CX01 | Expiry of patent term | ||
| CX01 | Expiry of patent term |
Granted publication date: 20131009 |