CN106439357B - A kind of anti-buckling telescopic expansion loop of pretension and its application - Google Patents
A kind of anti-buckling telescopic expansion loop of pretension and its application Download PDFInfo
- Publication number
- CN106439357B CN106439357B CN201610817133.7A CN201610817133A CN106439357B CN 106439357 B CN106439357 B CN 106439357B CN 201610817133 A CN201610817133 A CN 201610817133A CN 106439357 B CN106439357 B CN 106439357B
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- Prior art keywords
- tube
- axial limiting
- axial
- pipeline
- outer tube
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
- F16L51/00—Expansion-compensation arrangements for pipe-lines
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- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Joints Allowing Movement (AREA)
- Surgical Instruments (AREA)
Abstract
The invention discloses a kind of anti-buckling telescopic expansion loop of pretension and its application, the present apparatus includes outer tube, overcoat pressure pipe, inner tube, hold-down bolt, rolling bearing and sealing rubber layer etc..The present apparatus sets axial limit structure in pipe, ensure that one-way movement of the inner tube with respect to outer tube, is compared with conventional bushing-type compensator, reduces pipeline and sealing material because temperature and pressure ringing produces the risk for moving back and forth and destroying；The pre-tensile stress that axial limit structure produces pipeline at the same time can offset the compression that part temperature and pressure synergy produces, so as to prevent pipeline from complete buckling occurs, reach the effect that tradition triggers pre-tensile stress to carry out flexing protection by embedding prebuckling pipeline, it is embedding difficult to solve the problems, such as that traditional pre-tensile stress applies the deep-sea faced, construction cost has been saved at the same time, ensures pipeline work safety.
Description
Technical field
The present invention relates to the anti-buckling method and apparatus field of submerged pipeline, the anti-buckling sleeve of especially a kind of pretension
Formula expansion loop and its application.
Background technology
21 century is the century of ocean.Currently, consumed with excessive growth, the aggravation of the energy of population so that marine oil
This emerging oil-gas mining source of gas resource, becomes the key technique that coastal various countries of the world competitively develop.In deep-sea oil
In gas engineering, submarine pipeline is indispensable key equipment.The naked horizontal direction complete buckling for putting submerged pipeline under high temperature and pressure
It is one of principal mode of pipeline failure, is the allowed important technical challenges that deep-sea oil gas exploitation faces.
For this problem, large quantities of scholars have carried out one of a series of correlative study of submarine pipeline flexing protection, method
It is that line construction is improved to realize pipe thermal compensation, it is main in engineer application at present to include mending using corrugated expansion joint
Repay, slip-type expansion joint compensation etc. a variety of thermal compensation modes.Although above compensation way is technically ripe, exist to a certain degree
Deficiency and shortcoming, such as corrugated compensator is difficult to install with hysteresis, and compensation rate is little, generally in 200-300mm or so；Set
The destruction of cartridge type compensator sealing material easily caused by reciprocating motion, causes to reveal.Another flexing means of defence is in pipe
After road is laid with, acted on by applying a degree of temperature and pressure to unburied pipeline, produce pipeline pre- in the wrong in elastic range
Song, then again by piping laying on position after flexing, so that triggered pre-tensile stress in pipeline, and after coming into operation, pipe
The compression part that line produces under temperature and pressure synergy is offset by pre-tensile stress, so as to reach pipeline protective action, this method
It is that submerged pipeline flexing protects one of most economical easy measure, its major defect is as oil development is to deep-sea development, to pre-
The embedding construction of flexing pipeline is extremely difficult.
The content of the invention
The present invention is based on pipeline complete buckling principle, proposes that one kind utilizes casing linkage section, inner tube is by radial direction position limiting structure
Guarantee is concentric with outer tube, while inner tube is acted on unidirectional movement vertically by axial limit structure, pipeline is produced elastic range
Interior pretension, when pipeline is worked by temperature and pressure synergy inside axial limit structure make pipeline produce pre-tensile stress offset
The compression that part temperature and pressure synergy produces, so as to prevent pipeline from the telescopic expansion loop of complete buckling occurs.The prestretching
Thermal compensation mode of the power slip-type expansion joint to pipeline realizes the combination of conventional subsea pipeline flexing means of defence.
The present invention is achieved by the following technical solutions：
A kind of anti-buckling telescopic expansion loop of pretension, including outer tube, overcoat pressure pipe, inner tube, hold-down bolt, rolling
Dynamic bearing and sealing rubber layer etc.；Outer tube is coaxially disposed with overcoat pressure pipe, the two connected by hold-down bolt to be formed it is telescopic
The left sleeve structure and right tube-in-tube structure at expansion loop both ends, are coaxially disposed interior between left sleeve structure and right tube-in-tube structure
Pipe, sealing rubber layer is set along outer sleeve inner wall, sets front roll bearing and rear rolling bearing at the both ends of sealing rubber layer, outside
Axial limiter is placed equidistant with vertically on casing pressure inside pipe wall, and edge in the region on the inside of overcoat pressure pipe is located on the outer wall of inner tube
Circumference is provided with axial limiting groove, and the both ends of inner tube are embedded in the front roll bearing of outer tube, sealing rubber layer and rear rolling
In bearing.
Moreover, the outer tube includes, side section, thick section, stage casing, thin segment and outer tube are raised, and side section is used to connect routine
Conveyance conduit, side section and thick section there is identical internal diameter, thick section, stage casing and thin segment have identical outside diameter, thick section tube wall
Thickness is more than the thickness of stage casing tube wall, and the thickness of stage casing tube wall is more than the thickness of thin segment tube wall, and outer tube protrusion is arranged at thin segment
End.
Moreover, the internal diameter of the inner tube is equal to the internal diameter of outer tube side section and thick section.
Moreover, being provided with overcoat pressure pipe protrusion on the outer wall of the overcoat pressure pipe, hold-down bolt is arranged at overcoat pressure pipe
Overcoat pressure pipe it is raised between the outer tube protrusion of outer tube.
Moreover, the sealing rubber layer is arranged on the thin segment inner wall of outer tube, sealing rubber layer is fitted closely in outer
Between internal surface of sleeve pipe and outer wall of inner tube, to ensure the leakproofness of outer tube and interior pipe connecting structure.
Moreover, the front roll bearing and rear rolling bearing matches with inner tube, i.e. front roll bearing and the rear axis of rolling
The internal diameter held is slightly larger than the outside diameter of inner tube, and steel ball, inner tube and the steel in bearing are provided with front roll bearing and rear rolling bearing
Pearl is in contact, and while inner and outer pipes and concentric rolling bearing three is ensured, makes the relative motion resistance between inner and outer pipes to roll
Frictional force.
Moreover, the axial limiter is by axial limiting pedestal, axial limiting handle, rotating bolt and torque spring group
Into axial limiting pedestal is welded on the inner wall of overcoat pressure pipe, totally 4-8 group, is axially equally spaced along pipeline, every group by 6-16
A axial limiting pedestal is formed, and is uniformly distributed with axial limiting pedestal is organized on the outer same circumference of casing pressure inside pipe wall；Axial limiting
Handle is arranged between axial limiting pedestal, with being provided with isometrical circular hole on axial limiting pedestal on axial limiting handle, rotates spiral shell
Bolt links together axial limiting handle and axial limiting pedestal through circular hole, and two groups of torsion bullets are provided with the outside of rotating bolt
Spring, the outboard end of two groups of torque springs are connected with axial limiting pedestal respectively, the medial extremitys of two groups of torque springs respectively with axial direction
Spacing handle connection.
Moreover, the axial limiting groove replaces connection with curved surface by straight plane and forms, under curved surface and axial limiting handle
The curvature of end curved surface is identical, i.e. axial limiting handle and the curved surface of axial limiting groove matches, to ensure that axial limiting handle can be with
It is stuck in axial limiting groove, the quantity of curved surface is 4-8, and identical with the axial setting quantity of axial limiter, two adjacent
The distance between curved surface it is equal with the distance between axially connected axial limiter.
Compared with prior art, the beneficial effects of the invention are as follows：
1. the present invention is applied by pipeline elongation and pre-tensile stress realizes thermal compensation, component realizes land installation, reduces heat
Compensator installation cost；
2. thermal compensation of the present invention is realized in outer casing section, the enough space to be preserved of outer segment ensure pipeline high temperature and pressure joint
Freely extending under effect；
3. the present invention sets axial limit structure in pipe, which ensure that one-way movement of the inner tube with respect to outer tube, with
Conventional bushing-type compensator is compared, and reduces pipeline and sealing material because temperature and pressure ringing produces the wind for moving back and forth and destroying
Danger；
4. axial limit structure of the present invention makes inner and outer pipes unidirectionally move vertically, because the pipeline section of high temperature and pressure effect elongation exists
No longer bounce back in temperature-fall period, pipeline is produced certain pre-tensile stress in temperature-fall period, in pipeline second and later institute
Have in working cycles, the pre-tensile stress that axial limit structure produces pipeline can offset the pressure that part temperature and pressure synergy produces should
Power, so as to prevent pipeline from complete buckling occurs, reaches tradition and triggers pre-tensile stress progress flexing to prevent by embedding prebuckling pipeline
The effect of shield, solves the problems, such as that traditional pre-tensile stress applies the embedding difficulty in the deep-sea faced, while has saved construction cost, protects
Demonstrate,prove pipeline work safety；
5. the torque spring of axial limiter of the present invention, ensure that axial limiting handle is by torsion bullet before inner tube insertion sleeve
Spring effect is radially directed, and ensure that spacing handle is contacted with the perfection of limiting groove in the work phase；
6. the present invention has the concentric motion that the rolling bearing device of radial direction limit function ensure that inner and outer pipes axial direction；
7. high-temperature resistant rubber sealant internal diameter of the present invention is slightly less than interior pipe outside diameter, sealant extruding inner tube, ensures good
Sealing effect.
Brief description of the drawings
Fig. 1-1 is a kind of new telescopic expansion loop longitudinal section sectional view of pretension.
Fig. 1-2 is the thin portion structure diagram of the one side (left sleeve structure) of Fig. 1-1.
Fig. 2-1 is a kind of cross section view of pipeline section residing for new telescopic expansion loop axial limiter of pretension.
Fig. 2-2 is the structure diagram of axial limiter in Fig. 2-1.
Fig. 3-1 is a kind of new telescopic expansion loop axial limit structure operating diagram (axial limiter of pretension
Under off working state).
Fig. 3-2 is the partial structurtes enlarged diagram of Fig. 3-1.
Fig. 3-3 is a kind of new telescopic expansion loop axial limit structure operating diagram (axial limiter of pretension
When contacting inner tube).
Fig. 3-4 is the partial structurtes enlarged diagram of Fig. 3-3.
Fig. 3-5 is a kind of new telescopic expansion loop axial limit structure operating diagram (axial limiter of pretension
Under working status).
Fig. 3-6 is the partial structurtes enlarged diagram of Fig. 3-5.
Wherein, 1 is outer tube, and 1-1 is side section, and 1-2 is thick section, and 1-3 is stage casing, and 1-4 is thin segment, and 1-5 is convex for outer tube
Rise, 2 be overcoat pressure pipe, and 2-1 is raised for overcoat pressure pipe, and 3 be inner tube, and 4-1 is front roll bearing, and 4-2 is rear rolling bearing, and 5 are
Sealing rubber layer, 6 be hold-down bolt, and 7 be axial limiter, and 8 be axial limiting groove, and 8-1 is straight plane, and 8-2 is curved surface, 9
It is torque spring for axial limiting handle, 10,11 be rotating bolt, and 12 be axial limiting pedestal, and 13 be left sleeve structure, and 14 be the right side
Tube-in-tube structure.
Embodiment
The present invention is described in further detail with specific embodiment below in conjunction with the accompanying drawings：
As it is shown in the figures, the overall structure of the present invention passes through pressure for outer tube 1 with the overcoat pressure pipe 2 with axial limiter
Tight bolt 6 connects and composes left sleeve structure 13 and right tube-in-tube structure 14, and the inner tube 3 of six sections of axial limiting grooves 8 is welded on outer wall
Inside insert between two sleeves, the side section 1-1 welding conventional pipelines of outer tube both sides, internal diameter and outer tube (the side section 1-1 of inner tube
With thick section 1-2) internal diameter size be equal to conventional pipeline size.Axial limiting groove, axial limiting groove are welded on outer wall of inner tube
Including straight plane 8-1 and curved surface 8-2, curved surface is identical with 9 curvature of curved surface of axial limiting handle.Inner tube is (axial by axial limit structure
Limiter 7 and axial limiting groove) act in outer tube and unidirectionally move；Rolling bearing (the preceding rolling being embedded in outer tube
Dynamic bearing 4-1 and rear rolling bearing 4-2) contacted with inner tube by steel ball rolling friction in bearing, in bearing outside diameter and outer tube
Footpath is equal, and bearing bore diameter is slightly larger than interior pipe outside diameter, ensure inner and outer pipes it is concentric while, make opposite between inner tube and outer tube
The resistance of motion is less than the conventional cannula rigidly to rub；Two roller bearing shops are the refractory seals rubber layer in outer tube wall
5, sealing rubber layer is fitted in outer tube wall, and inner tube is inserted in annular rubber layer, and rubber layer has certain elasticity, its internal diameter
It is slightly less than interior pipe outside diameter, rubber layer squeezed tight inner tube after installation, to seal pipeline.
Conventional pipeline radius described in the present embodiment is 0.16195m, wall thickness 0.0127m.Per the routine of 2000m spacing
Pipeline connects the compensator, and when conveying high-temperature high-pressure medium for the first time, pipeline produces compression under temperature and pressure synergy
And dilatancy trend, therefore with outer tube relative motion occurs for the inner tube of expansion loop, compression is by pipeline telescopic
Compensator section is axially elongated to be discharged, and realizes pipe thermal compensation, prevents pipeline from complete buckling occurs and destroys；During cooling, pipe
Caused deflection has the trend of reduction when line heats up, and the phase opposite with original direction of motion is produced between inner tube and outer tube
To movement tendency, but the axial limiting handle of overcoat pressure pipe inner wall will be stuck in the axial limiting groove for being welded on outer wall of inner tube at this time
(see Fig. 3-5 and Fig. 3-6), limits pipeline counter motion, and pipeline produces pre-tensile stress because that can not shrink, in second of pipeline and
In later all working circulation, the pre-tensile stress that axial limiting produces pipeline can offset the pressure that part temperature and pressure synergy produces
Stress, so as to prevent pipeline from complete buckling occurs.
Axial limit structure (axial limiter and axial limiting groove) by including axial limiting pedestal, axial limiting handle,
Rotating bolt, torque spring axial limiter and be welded on outer wall of inner tube axial limiting groove composition, its operation principle
As shown in Fig. 2-1 and Fig. 2-2.The arrangement number and density of axial limiter are connected the size and pipe of conventional pipeline by compensator
Road work temperature and pressure environment determines that the number of distance and axial limiting groove between axial limiting groove is with axial limiter phase one
Cause.The present embodiment is related to operating temperature for 93 DEG C, its axial limiter contains 6 groups altogether, and axial spacing is 0.05m, and every group by edge
12 limiters with sectional uniform distribution are formed.When inner tube is with outer tube relative motion, axial limiting handle is made in torque spring
The trend that oriented original position rotates always under, when close to limiting groove, axial limiting handle is caught in axial limiting groove, is reached
To axial limiting function.
The present invention is described in detail above, but the content is only presently preferred embodiments of the present invention, it is impossible to recognized
For the practical range for limiting the present invention.Any changes and modifications in accordance with the scope of the present application, should all still return
Belong within the patent covering scope of the present invention.
Claims (6)
- A kind of 1. anti-buckling telescopic expansion loop of pretension, it is characterised in that：Including outer tube, overcoat pressure pipe, inner tube, pressure Tight bolt, rolling bearing and sealing rubber layer；Outer tube is coaxially disposed with overcoat pressure pipe, the two connects to be formed by hold-down bolt The left sleeve structure and right tube-in-tube structure at telescopic expansion loop both ends, coaxially set between left sleeve structure and right tube-in-tube structure Put inner tube, outer tube includes that side section, thick section, stage casing, thin segment and outer tube are raised, and the internal diameter of inner tube is equal to outer tube side section and slightly Section internal diameter, along outer tube tubule inner wall set sealing rubber layer, sealing rubber layer both ends set front roll bearing and Rear rolling bearing, front roll bearing and rear rolling bearing match with inner tube, and axis is placed equidistant with vertically on overcoat pressure pipe inner wall To limiter, axial limiter is made of axial limiting pedestal, axial limiting handle, rotating bolt and torque spring, axial limiting Pedestal is welded on the inner wall of overcoat pressure pipe, is axially equally spaced along pipeline, with group axial limiting pedestal in outer casing pressure inside pipe wall Be uniformly distributed on same circumference, axial limiting handle is arranged between axial limiting pedestal, on axial limiting handle with axial limiting base Isometrical circular hole is provided with seat, rotating bolt links together axial limiting handle and axial limiting pedestal through circular hole, turns Two groups of torque springs are provided with the outside of dynamic bolt, the outboard end of two groups of torque springs is connected with axial limiting pedestal respectively, and two The medial extremity of group torque spring is connected with axial limiting handle respectively；On the outer wall of inner tube in the region on the inside of overcoat pressure pipe Axial limiting groove is circumferentially provided with, axial limiting groove replaces connection with curved surface by straight plane and forms, and curved surface is limited with axial The curvature of end curved surface is identical under the handle of position, and the both ends of inner tube are embedded in the front roll bearing of outer tube, sealing rubber layer and rear rolling In bearing.
- A kind of 2. anti-buckling telescopic expansion loop of pretension according to claim 1, it is characterised in that：Described is outer The side section of casing is used to connect conventional conveyance conduit, and side section and thick section have identical internal diameter, and thick section, stage casing and thin segment have Identical outside diameter, the thickness of thick section tube wall are more than the thickness of stage casing tube wall, and the thickness of stage casing tube wall is more than the thickness of thin segment tube wall, Outer tube protrusion is arranged at the end of thin segment.
- A kind of 3. anti-buckling telescopic expansion loop of pretension according to claim 1, it is characterised in that：Described is outer Cover and overcoat pressure pipe protrusion is provided with the outer wall of pressure pipe, hold-down bolt is arranged at the overcoat pressure pipe protrusion and outer tube of overcoat pressure pipe Outer tube protrusion between.
- A kind of 4. anti-buckling telescopic expansion loop of pretension according to claim 1, it is characterised in that：Before described The internal diameter of rolling bearing and rear rolling bearing is slightly larger than the outside diameter of inner tube, and steel is provided with front roll bearing and rear rolling bearing Pearl, inner tube are in contact with the steel ball in bearing, are ensureing inner and outer pipes and while concentric rolling bearing three, make between inner and outer pipes Relative motion resistance is force of rolling friction.
- A kind of 5. anti-buckling telescopic expansion loop of pretension according to claim 1, it is characterised in that：The axis It is totally 4-8 group to the quantity of spacing pedestal, every group is made of 6-16 axial limiting pedestals.
- A kind of 6. anti-buckling telescopic expansion loop of pretension according to claim 1, it is characterised in that：The axis Match to the curved surface of spacing handle and axial limiting groove, it is bent to ensure that axial limiting handle can be stuck in axial limiting groove The quantity in face is 4-8, and axial with axial limiter sets quantity identical, the distance between two adjacent curved surfaces and axial direction The distance between connected axial limiter is equal.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810045903.XA CN108386642B (en) | 2016-09-12 | 2016-09-12 | Application of the telescopic expansion loop in the anti-buckling field of submerged pipeline |
| CN201610817133.7A CN106439357B (en) | 2016-09-12 | 2016-09-12 | A kind of anti-buckling telescopic expansion loop of pretension and its application |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610817133.7A CN106439357B (en) | 2016-09-12 | 2016-09-12 | A kind of anti-buckling telescopic expansion loop of pretension and its application |
Related Child Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201810045903.XA Division CN108386642B (en) | 2016-09-12 | 2016-09-12 | Application of the telescopic expansion loop in the anti-buckling field of submerged pipeline |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN106439357A CN106439357A (en) | 2017-02-22 |
| CN106439357B true CN106439357B (en) | 2018-05-15 |
Family
ID=58167693
Family Applications (2)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201610817133.7A Expired - Fee Related CN106439357B (en) | 2016-09-12 | 2016-09-12 | A kind of anti-buckling telescopic expansion loop of pretension and its application |
| CN201810045903.XA Expired - Fee Related CN108386642B (en) | 2016-09-12 | 2016-09-12 | Application of the telescopic expansion loop in the anti-buckling field of submerged pipeline |
Family Applications After (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201810045903.XA Expired - Fee Related CN108386642B (en) | 2016-09-12 | 2016-09-12 | Application of the telescopic expansion loop in the anti-buckling field of submerged pipeline |
Country Status (1)
| Country | Link |
|---|---|
| CN (2) | CN106439357B (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108443121B (en) * | 2018-05-28 | 2024-06-04 | 中国有色(沈阳)泵业有限公司 | Diaphragm cavity structure |
| CN110822170A (en) * | 2019-11-21 | 2020-02-21 | 天津大学 | Water intaking end stable structure and contain sea water piping system of this structure |
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| CN2314214Y (en) * | 1997-12-30 | 1999-04-14 | 机械工业部沈阳仪器仪表工艺研究所 | Force balancing corrugated compensator |
| CN202065599U (en) * | 2011-04-21 | 2011-12-07 | 中国海洋石油总公司 | Expansion bend for adsorbing expansion deformation of submarine pipeline |
| CN103939702A (en) * | 2014-03-19 | 2014-07-23 | 江苏曙光压力容器有限公司 | External pressure type axial expansion joint |
| CN104712865A (en) * | 2015-03-30 | 2015-06-17 | 邝月好 | Expansion compensation connecting pipe fitting |
| EP2982888A1 (en) * | 2014-08-04 | 2016-02-10 | VAT Holding AG | Membrane bellows |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2152132Y (en) * | 1993-01-09 | 1994-01-05 | 陶柏林 | Balance corrugated pipe compensator |
| CN2165310Y (en) * | 1993-06-16 | 1994-05-18 | 韩彦民 | Unloading expansion compensation connector |
| KR100535707B1 (en) * | 2004-03-25 | 2005-12-09 | 고등기술연구원연구조합 | Double pipe for high pressure and temperature |
| CN2739461Y (en) * | 2004-10-20 | 2005-11-09 | 蒋新锋 | Complementary Pipeline Compensator |
| CN2767796Y (en) * | 2005-02-04 | 2006-03-29 | 刘运章 | Non-metal bellows expansion joint for airway |
| CN201688074U (en) * | 2010-03-17 | 2010-12-29 | 浙江方明塑胶管道有限公司 | Two-way retractable plastic pipeline union |
| CN203656451U (en) * | 2013-09-25 | 2014-06-18 | 青阳县三宝塑业有限责任公司 | Sleeve expansion joint structure provided with sensors |
-
2016
- 2016-09-12 CN CN201610817133.7A patent/CN106439357B/en not_active Expired - Fee Related
- 2016-09-12 CN CN201810045903.XA patent/CN108386642B/en not_active Expired - Fee Related
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2314214Y (en) * | 1997-12-30 | 1999-04-14 | 机械工业部沈阳仪器仪表工艺研究所 | Force balancing corrugated compensator |
| CN202065599U (en) * | 2011-04-21 | 2011-12-07 | 中国海洋石油总公司 | Expansion bend for adsorbing expansion deformation of submarine pipeline |
| CN103939702A (en) * | 2014-03-19 | 2014-07-23 | 江苏曙光压力容器有限公司 | External pressure type axial expansion joint |
| EP2982888A1 (en) * | 2014-08-04 | 2016-02-10 | VAT Holding AG | Membrane bellows |
| CN104712865A (en) * | 2015-03-30 | 2015-06-17 | 邝月好 | Expansion compensation connecting pipe fitting |
Also Published As
| Publication number | Publication date |
|---|---|
| CN108386642A (en) | 2018-08-10 |
| CN108386642B (en) | 2019-10-11 |
| CN106439357A (en) | 2017-02-22 |
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