CN105333243A - High pressure pipeline (functional combination through winding SUS304L pipes around GRP pipes) - Google Patents
High pressure pipeline (functional combination through winding SUS304L pipes around GRP pipes) Download PDFInfo
- Publication number
- CN105333243A CN105333243A CN201510814935.8A CN201510814935A CN105333243A CN 105333243 A CN105333243 A CN 105333243A CN 201510814935 A CN201510814935 A CN 201510814935A CN 105333243 A CN105333243 A CN 105333243A
- Authority
- CN
- China
- Prior art keywords
- grp
- sus304l
- pipe
- pipeline
- wound around
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
- F16L9/00—Rigid pipes
- F16L9/18—Double-walled pipes; Multi-channel pipes or pipe assemblies
- F16L9/19—Multi-channel pipes or pipe assemblies
Abstract
The invention provides a high pressure pipeline (functional combination through winding SUS304L pipes around GRP pipes). In a functional combination pipeline device for remotely delivering high-temperature and high-pressure liquid (gas), two SUS304L bushing rings are flatly welded on SUS304L pipe flange inner cavities with neck raised faces, at the two ends of the pipeline, seven GRP pipelines wound by SUS304L pipes are respectively inserted and assembled in a wound GRP large pipeline in series, the two SUS304L bushing rings welded on the pipe flange inner cavities with the neck raised faces are respectively flatly welded firmly with the end exposed parts of the seven GRP pipelines wound by the SUS304L pipes, a GRP seal structure layer is formed at notch end parts between pipe flanges with the neck raised faces and the wound GRP large pipeline by adopting relevant glass fibers and GRP bonding adhesive, which are used for winding, through molding and firm bonding, and functional combination suite products are manufactured in an integrated manner.
Description
Art
The invention relates to a kind of high-pressure pipe (SUS304L pipe is wound around GRP tube function and service).One is applicable in pipeline (SUS304L pipe the is wound around GRP tube function and service) device of long-range conveying High Temperature High Pressure power liquid (gas) body, pipeline drift diameter scope exists: DN15mm ~ 600mm, medium temperature in pipe :-80 DEG C ~ 555 DEG C, allow to be suitable for pressure and be: PN2.0MPa, PN5.0MPa, PN11.0MPa, PN15.0MPa; The usual design length of pipeline is: 2M, 3M, 5M, 6M, 8M, 10M, 12M.
SUS304L---the Japanese stainless steel standard trade mark (JIS), the Chinese stainless steel standard trade mark (GB1220) corresponded is: 00Cr19Ni10; SUS304L (00Cr19Ni10) belongs to Austenitic heat resistant type high-alloy stainless steel material; Use the most extensive as stainless refractory steel, the corrosion resistance that resistance to high temperature spy is good, excellent, anti-aging and have no side effect, resistance to intergranular corrosion is superior, oxidative stability medium is preeminent, for food equipment, long-range conveying drinking water source safety reliability is strong, for vague generalization construction equipment, atomic energy industry equipment, the inflammable and explosive liquid of long-range conveying (gas) body safety reliability is high.
GRP---GlassfiberReinforcedPlastic (glass fiber reinforced plastic), we are domestic is commonly called as: glass fibre reinforced plastics; The material that GRP is made up of glass fibre (reinforcing phase) and synthetic resin (matrix phase) exactly.
Be wound around the raw material that GRP is used, mainly continuous glass fibre and the large class of binder two; The quality of material property quality and technology capability, directly will affect the quality of goods; Therefore according to the usage requirement of goods, corresponding raw material must be selected; Be wound around the glass fibre that GRP applies, concrete form has: roving, has twist yarn, without latitude band and glass cloth tape etc., wherein especially uses the widest with roving; And the kind of glass fibre has: there is alkali fiber, without alkali fiber and high-intensity fiber; For the requirement being wound around GRP goods that meets the demands, selection principle for example: the goods high to mechanical property requirements, should high-intensity fiber be selected; To chemoresistant product, alkali fiber should be selected; The goods high to requirement on electric performance, then can select alkali-free fiber; The binder of Filament-wound Machine, extensively adopts epoxy resin; This is mainly because epoxy resin has excellent mechanical property, fatigue behaviour, resistance to heat and bonding property; In addition because epoxy resin cure shrinks little; Alkyd resin, organic siliconresin and phenolic resin are only confined to special purposes: polyester is commonly used in winding radome, and phenolic aldehyde and organosilicon are in high temperature resistant winding product; In actual winding, the most frequently used epoxy resin is epoxychloropropane-bisphenol A-type; Conventional auxiliary material: curing agent acid anhydrides, amine and polymeric consolidator etc.
Be wound around GRP have that specific strength is high, corrosion-resistant, cost is low, quality is good and be easy to realize the advantages such as automatic and mechanical; As the products such as basin, pipeline, pressurized container, radome are just being widely applied to the every field of producing with engineering.
GRP winding product, in forming process, for making goods obtain certain shape and physical dimension and meet forming requirements, must adopt one with the core of goods cavity shape consistent size; After urethane cure, it can be taken off and don't damage or destroy the goods wound.
GRP, as structural material, has obvious advantage compared with usual metallic material, also has obvious shortcoming; The specific strength of GRP is higher, and it is higher than common iron a lot; Therefore, GRP has: high-strength light, corrosion-resistant, anti-conductivity are good, heat-insulating property and instantaneous resistance to high temperature good, and convenient formation is flexible etc., makes the application of GRP very wide; But the Young's modulus of GRP is lower; Only about 1/4 of common iron.If structure by stiffness reliability, then must adopt corresponding measure to improve the rigidity of GRP structure; For example ribbing or employing sandwich structure etc.
In view of SUS304L and GRP structural material respectively has obvious merits and demerits respectively, the principle of " keeping away it by its length short " just must be followed when carrying out this high-pressure pipe (SUS304L pipe is wound around GRP tube function and service) structural design; In order to improve oeverall quality and the technical performance of this piping articles, be applied in each engineering field can project of vital and lasting importance, function and service stuctures and properties after this high-pressure pipe (SUS304L pipe is wound around GRP tube function and service) is wound around, combine SUS304L and GRP structural material and respectively have obvious advantage, in an embodiment, they mainly have: high pressure resistant resistance to high temperature spy is good, chemical resistance dielectric corrosion performance is excellent, anti-aging and have no side effect; Resistance to intergranular corrosion is superior, and oxidative stability medium spy is good; Fluid resistance little, long-range conveying drinking water source safety reliability is strong; High, the long-range conveying of explosion proof ratings inflammable and explosive liquid (gas) body safety reliability is high; Appearance is wound around that corrosion-resistant, the anti-conductivity of GRP tube is good, heat-insulating property and instantaneous resistance to high temperature good, and convenient formation is flexible etc.The stiffness grade of the function pipeline composite structure after winding is high especially, pipeline anti-in pressure and critical external compressive resistance mechanical mechanics property and fatigue behaviour preeminent, the advantages such as bending resistance is outstanding, and long service life, designability are strong, installation is convenient; The latus rectum scope of pipeline when DN15mm ~ 600mm, media operation temperature-80 DEG C ~ 555 DEG C time, pipe in authorized pressure (MPa) can be: PN2.0, PN5.0, PN11.0, PN15.0; The fast gross investment of engineering construction economizes, project of vital and lasting importance, and operation maintenance management is convenient, and long-range conveying environment-protecting clean, speed are fast, and Long-Time Service is not easily damaged, and maintenance expense is few; Secondly, when seven SUS304L pipes of middle compound are wound around GRP respectively, do not need liner core, overall manufacture cost is the feature such as low also.
Background technique
Glass fiber winding GRP tube road in current use, be base material by synthetic resin, glass fibre is reinforcing material, adopts specific core to make liner and makes through Mechanical entanglement processes solidifying; The advantages such as this pipeline has corrosion resistance and good, good insulation preformance, heat-shielding performance is good, high-strength light, long service life, designability are strong, easy for installation.The deficiency that their exist is: in an embodiment, pipeline stiffness rank difference, bending resistance are poor, proof to external pressure and internal pressure strength all poor (authorized pressure≤4.0MPa), temperature tolerance general (permission serviceability temperature≤100 DEG C), Mechanical entanglement time goods inner chambers must specification needed for liner core, add the investment cost etc. of all size core series simultaneously.
PVC/GRP multiple tube in current use makes liner by Polyvinylchloride (PVC) pipe, is wound around GRP and makes outer enhancement layer, makes through specific mechanical winding process solidification compound molding; This pipeline has corrosion resistance and good, proof to external pressure intensity is high, shock resistance good, fluid resistance is little, without electrochemical corrosion, less investment, the advantage such as easy for installation; The deficiency that their exist is: in an embodiment, the Polyvinylchloride pipe after Long-Time Service aging fast, burst strength is poor, pipeline stiffness rank difference (authorized pressure≤4.0MPa), heat resistance difference (allowing serviceability temperature-15 DEG C ~ 80 DEG C), working life is less than 10 years etc.
Summary of the invention
The invention solves the technological scheme that its technical problem adopts: in a kind of pipeline (SUS304L pipe is wound around GRP tube function and service) device of long-range conveying High Temperature High Pressure power liquid (gas) body, comprise and having: to be dashed forward face SUS304L pipe flange by band neck respectively in the two ends of high-pressure pipe (SUS304L pipe be wound around GRP tube function and service), wherein the band neck of every one end is dashed forward pipe flange inner chamber, downhand welding has the SUS304L grommet of two plum blossom shapes respectively, moreover the SUS304L pipeline winding GRP tube road string insert group forming plum blossom shape by seven is respectively loaded in winding GRP large pipeline, to dash forward with neck the SUS304L grommet of two plum blossom shapes that the downhand welding of pipe flange inner chamber has, the extending part, termination in GRP tube road is wound around respectively by after downhand welding firmly with seven SUS304L pipelines, correct the welding deformation of all components, after removing the jagged welding slag greasy dirt of institute, to dash forward pipe flange and the breach end that is wound around between GRP large pipeline with neck, the glass fibre and the bonding sizing material of GRP that are wound around with being associated respectively, and firmly form GRP sealing configuration layer by shaping splicing, and the comprehensive function and service suite product manufactured.
Accompanying drawing explanation
Below in conjunction with drawings and Examples, the invention is further illustrated;
Fig. 1 is the suite plan view of the invention embodiment;
Fig. 2 is the suite rear view of the invention embodiment;
Fig. 3 is the suite plan view of the invention embodiment;
Fig. 4 is the suite worm's eye view of the invention embodiment;
Fig. 5 is the suite left view of the invention embodiment;
Fig. 6 is the suite right elevation of the invention embodiment;
Fig. 7 is the m-m sectional view of the figure mono-of the invention embodiment;
Fig. 8 is the n-n sectional view of the figure mono-of the invention embodiment;
Fig. 9 is the A-A sectional drawing of the figure mono-of the invention embodiment;
Figure 10 is the B-B sectional drawing of the figure mono-of the invention embodiment;
Figure 11 is the k-k sectional view of the figure five of the invention embodiment.
In Fig. 5: be 1. with neck to dash forward face SUS304L downhand welding pipe flange, 2.SUS304L grommet, 3.SUS304L pipeline;
In Fig. 6: be 1. with neck to dash forward face SUS304L downhand welding pipe flange, 2.SUS304L grommet, 3.SUS304L pipeline;
In Fig. 7: be 1. with neck to dash forward face SUS304L downhand welding pipe flange, 2.SUS304L grommet, 3.SUS304L pipeline;
In Fig. 8: 2.SUS304L grommet, 3.SUS304L pipeline, 6.GRP sealing configuration layer;
In Fig. 9: 3.SUS304L grommet, be 4. wound around GRP tube road, be 5. wound around GRP large pipeline;
In Figure 10: 3.SUS304L pipeline, be 4. wound around GRP tube road, be 5. wound around GRP large pipeline, 6.GRP sealing configuration layer;
In Figure 11: be 1. with neck to dash forward face SUS304L downhand welding pipe flange, 2.SUS304L grommet, 3.SUS304L pipeline, is 4. wound around GRP tube road, is 5. wound around GRP large pipeline, 6.GRP sealing configuration layer.
Embodiment
At Fig. 5, Fig. 6, Fig. 7, Fig. 8, Fig. 9, Figure 10, in embodiment shown in Figure 11, comprise and having: to be dashed forward face SUS304L pipe flange (1) by band neck respectively in the two ends of high-pressure pipe (SUS304L pipe be wound around GRP tube function and service), wherein the band neck of every one end is dashed forward pipe flange (1) inner chamber, downhand welding has the SUS304L grommet (2) of two plum blossom shapes respectively, moreover SUS304L pipeline (3) winding GRP tube road (4) the string insert group forming plum blossom shape by seven is respectively loaded in winding GRP large pipeline (5), band neck is dashed forward the SUS304L grommet (2) of two plum blossom shapes that pipe flange (1) inner chamber downhand welding has, the extending part, termination in GRP tube road (4) is wound around respectively by after downhand welding firmly with seven SUS304L pipelines (3), correct the welding deformation of all components, after removing the jagged welding slag greasy dirt of institute, the breach end that band neck is dashed forward between pipe flange (1) and winding GRP large pipeline (5), the glass fibre and the bonding sizing material of GRP that are wound around with being associated respectively, and firmly form GRP sealing configuration layer (6) by shaping splicing, and the comprehensive function and service suite product manufactured.
Claims (5)
1. a high-pressure pipe (SUS304L pipe is wound around GRP tube function and service), it is characterized in that: to be dashed forward face SUS304L pipe flange (1) by band neck respectively in the two ends comprising high-pressure pipe (SUS304L pipe be wound around GRP tube function and service), wherein the band neck of every one end is dashed forward pipe flange (1) inner chamber, downhand welding has the SUS304L grommet (2) of two plum blossom shapes respectively, moreover SUS304L pipeline (3) winding GRP tube road (4) the string insert group forming plum blossom shape by seven is respectively loaded in winding GRP large pipeline (5), band neck is dashed forward the SUS304L grommet (2) of two plum blossom shapes that pipe flange (1) inner chamber downhand welding has, the extending part, termination in GRP tube road (4) is wound around respectively by after downhand welding firmly with seven SUS304L pipelines (3), correct the welding deformation of all components, after removing the jagged welding slag greasy dirt of institute, the breach end that band neck is dashed forward between pipe flange (1) and winding GRP large pipeline (5), the glass fibre and the bonding sizing material of GRP that are wound around with being associated respectively, and firmly form GRP sealing configuration layer (6) by shaping splicing, and the comprehensive function and service suite product manufactured.
2. high-pressure pipe according to claim 1 (SUS304L pipe is wound around GRP tube function and service), is characterized in that: the applicable authorized pressure (MPa) in described pipeline: PN2.0, PN5.0, PN11.0, PN15.0; Be suitable for latus rectum scope (mm): DN15 ~ 600; Medium serviceability temperature (DEG C) in pipe :-80 ~ 555; The usual design length of pipeline is: 2M, 3M, 5M, 6M, 8M, 10M, 12M.
3. high-pressure pipe according to claim 1 (SUS304L pipe is wound around GRP tube function and service), it is characterized in that: described band neck is dashed forward face SUS304L downhand welding pipe flange (1), the SUS304L grommet (2) of plum blossom shape, the SUS304L pipeline (3) of seven composition plum blossom shapes is all be by the stainless steel standard trade mark (GB1220): the Austenitic heat resistant type high-alloy stainless steel material of 00Cr19Ni10 material.
4. high-pressure pipe according to claim 1 (SUS304L pipe is wound around GRP tube function and service), it is characterized in that: described winding GRP tube road (4), be wound around GRP large pipeline (5), all different according to applying working condition condition technical performance requirements, selects the binder of Filament-wound Machine to have: epoxy resin, phenolic resin and organic siliconresin respectively; Selected continuous glass fibre has: have alkali fiber, without alkali fiber and high-intensity fiber etc., and (is called for short: GRP) winding product through mechanization winding process solidification glass fibre reinforced plastics firmly.
5. pipeline according to claim 1 (SUS304L pipe is wound around GRP tube function and service), it is characterized in that: described GRP sealing configuration layer (6), all requirements different according to applying working condition condition, adopt the glass fibre being associated and being wound around and the bonding sizing material of GRP respectively, and glued joint firm GRP sealing configuration layer by moulding process.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510814935.8A CN105333243A (en) | 2015-11-18 | 2015-11-18 | High pressure pipeline (functional combination through winding SUS304L pipes around GRP pipes) |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510814935.8A CN105333243A (en) | 2015-11-18 | 2015-11-18 | High pressure pipeline (functional combination through winding SUS304L pipes around GRP pipes) |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN105333243A true CN105333243A (en) | 2016-02-17 |
Family
ID=55283941
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201510814935.8A Pending CN105333243A (en) | 2015-11-18 | 2015-11-18 | High pressure pipeline (functional combination through winding SUS304L pipes around GRP pipes) |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN105333243A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109027498A (en) * | 2018-08-13 | 2018-12-18 | 芜湖康诺机电设备有限公司 | A kind of high-pressure oil pipe of explosion-proof leakage-proof |
| CN109797843A (en) * | 2017-11-16 | 2019-05-24 | 韩国电力技术株式会社 | Device for preventing foam from overflowing from the manhole for being connected to drainpipe |
Citations (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4634314A (en) * | 1984-06-26 | 1987-01-06 | Vetco Offshore Inc. | Composite marine riser system |
| US5137306A (en) * | 1990-02-26 | 1992-08-11 | The George-Ingraham Corp. | Multiple-duct conduit system with expansion chamber coupling |
| US5570723A (en) * | 1994-08-26 | 1996-11-05 | Air Products And Chemicals, Inc. | Support system and method for jacketed multiple cryogenic pipes for cyrogenic fluid transfer |
| CN1208144A (en) * | 1998-07-24 | 1999-02-17 | 侯贤忠 | GRP-thin wall stainless steel composite pipe and its making process |
| JP2004278866A (en) * | 2003-03-13 | 2004-10-07 | Tone Boring Co Ltd | Heat collection piping unit for underground heat exchange system |
| WO2012065218A1 (en) * | 2010-11-16 | 2012-05-24 | Amog Technologies Pty Ltd | A segmented riser bundle |
| CN202946799U (en) * | 2012-11-27 | 2013-05-22 | 天津市雪琰管业有限公司 | Glass fiber reinforced plastic lined with stainless steel composite pipe with thick-walled stainless steel connector with external threads |
| CN103453242A (en) * | 2013-09-25 | 2013-12-18 | 苏州誉之铖贸易有限责任公司 | Double-layer convection heat-insulation water pipe |
| CN104197114A (en) * | 2014-09-05 | 2014-12-10 | 中国石油集团渤海石油装备制造有限公司 | Composite steel tube used for oil and gas conveying pipeline and externally wound by glass fiber resin reinforcing protective layer |
| DE102013012695A1 (en) * | 2013-07-31 | 2015-02-05 | Kme Germany Gmbh & Co. Kg | Process for the production of jacketing pipes |
-
2015
- 2015-11-18 CN CN201510814935.8A patent/CN105333243A/en active Pending
Patent Citations (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4634314A (en) * | 1984-06-26 | 1987-01-06 | Vetco Offshore Inc. | Composite marine riser system |
| US5137306A (en) * | 1990-02-26 | 1992-08-11 | The George-Ingraham Corp. | Multiple-duct conduit system with expansion chamber coupling |
| US5570723A (en) * | 1994-08-26 | 1996-11-05 | Air Products And Chemicals, Inc. | Support system and method for jacketed multiple cryogenic pipes for cyrogenic fluid transfer |
| CN1208144A (en) * | 1998-07-24 | 1999-02-17 | 侯贤忠 | GRP-thin wall stainless steel composite pipe and its making process |
| JP2004278866A (en) * | 2003-03-13 | 2004-10-07 | Tone Boring Co Ltd | Heat collection piping unit for underground heat exchange system |
| WO2012065218A1 (en) * | 2010-11-16 | 2012-05-24 | Amog Technologies Pty Ltd | A segmented riser bundle |
| CN202946799U (en) * | 2012-11-27 | 2013-05-22 | 天津市雪琰管业有限公司 | Glass fiber reinforced plastic lined with stainless steel composite pipe with thick-walled stainless steel connector with external threads |
| DE102013012695A1 (en) * | 2013-07-31 | 2015-02-05 | Kme Germany Gmbh & Co. Kg | Process for the production of jacketing pipes |
| CN103453242A (en) * | 2013-09-25 | 2013-12-18 | 苏州誉之铖贸易有限责任公司 | Double-layer convection heat-insulation water pipe |
| CN104197114A (en) * | 2014-09-05 | 2014-12-10 | 中国石油集团渤海石油装备制造有限公司 | Composite steel tube used for oil and gas conveying pipeline and externally wound by glass fiber resin reinforcing protective layer |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109797843A (en) * | 2017-11-16 | 2019-05-24 | 韩国电力技术株式会社 | Device for preventing foam from overflowing from the manhole for being connected to drainpipe |
| CN109027498A (en) * | 2018-08-13 | 2018-12-18 | 芜湖康诺机电设备有限公司 | A kind of high-pressure oil pipe of explosion-proof leakage-proof |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN102679047B (en) | Continuous filament wound and reinforced thermoplastic pipe and manufacturing process thereof | |
| CN102182875B (en) | Non-adhesive pultruded composite tube | |
| CN109555909B (en) | Double-wall inner rib glass fiber reinforced plastic sandwich concrete high-strength composite pipeline and processing method thereof | |
| CN203641706U (en) | Short fiber reinforced polyethylene compound pipe | |
| CN102410411A (en) | Reinforced composite heat-preserving and heat-insulating ultrahigh molecular weight polyethylene pipe | |
| CN105333243A (en) | High pressure pipeline (functional combination through winding SUS304L pipes around GRP pipes) | |
| CN109323058A (en) | A kind of glass fiber reinforcement bonding flexible pipe suitable for high external pressure environment | |
| CN204328244U (en) | Chamber for fibre-reinforced plastics sand inclusion thermal insulation pipe | |
| CN108548018A (en) | Three step port high-pressure pipe member of continuous fiber reinforced thermoplastic concave | |
| EP2531769A2 (en) | Method of manufacturing of high-pressure container and a high-pressure container | |
| CN104385632B (en) | I shape glass fiber reinforced plastic shapes guides pultrusion die | |
| CN107781540A (en) | A kind of web reinforced plastic pipe | |
| CN104832721A (en) | Composite metal pipe material | |
| CN103032639A (en) | Non-adhesive pultrusion composite tube for intelligent drilling | |
| CN103694566A (en) | Carbon fiber reinforced polypropylene material and application thereof to pipeline | |
| CN202118388U (en) | Non-adhesive type pultrusion composite pipe | |
| KR200305942Y1 (en) | High strength tube | |
| CN203067973U (en) | Glass fiber reinforced plastic compound pipeline | |
| CN101725773A (en) | Manufacturing method for reinforcing plastic pipeline by using braided glass filament bundle compound polyolefin | |
| CN105570564A (en) | Pipeline | |
| CN101351318A (en) | Insert and injection-moulding part with insert | |
| CN216131509U (en) | Explosion-proof composite pipe | |
| CN201074708Y (en) | Glass fiber reinforced plastics outer canopy guard pipe | |
| CN205371839U (en) | Heavy -caliber double -wall corrugated pipe | |
| CN207661250U (en) | The hot winding pipe of high density polyethylene (HDPE) structural walls |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| RJ01 | Rejection of invention patent application after publication | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20160217 |