CN1272564C - Cross linking high density polyethylene pipe and construction process of its alternuting repairing old pipe line - Google Patents
Cross linking high density polyethylene pipe and construction process of its alternuting repairing old pipe line Download PDFInfo
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- CN1272564C CN1272564C CN 03126240 CN03126240A CN1272564C CN 1272564 C CN1272564 C CN 1272564C CN 03126240 CN03126240 CN 03126240 CN 03126240 A CN03126240 A CN 03126240A CN 1272564 C CN1272564 C CN 1272564C
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- crosslinked
- pipeline
- hdpe
- density polyethylene
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- 229920001903 high density polyethylene Polymers 0.000 title claims abstract description 90
- 239000004700 high-density polyethylene Substances 0.000 title claims abstract description 90
- 238000010276 construction Methods 0.000 title claims abstract description 20
- 238000000034 method Methods 0.000 title claims abstract description 19
- 238000004132 cross linking Methods 0.000 title claims abstract description 18
- 238000005516 engineering process Methods 0.000 claims abstract description 15
- 229920005989 resin Polymers 0.000 claims abstract description 10
- 239000011347 resin Substances 0.000 claims abstract description 10
- 239000004698 Polyethylene Substances 0.000 claims abstract description 9
- 238000003466 welding Methods 0.000 claims abstract description 9
- -1 polyethylene Polymers 0.000 claims abstract description 8
- 229920000573 polyethylene Polymers 0.000 claims abstract description 8
- 238000012360 testing method Methods 0.000 claims abstract description 7
- 239000003431 cross linking reagent Substances 0.000 claims abstract description 6
- 238000004519 manufacturing process Methods 0.000 claims abstract description 6
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 6
- 229930185605 Bisphenol Natural products 0.000 claims abstract description 5
- 239000003963 antioxidant agent Substances 0.000 claims abstract description 5
- 150000002148 esters Chemical class 0.000 claims abstract description 5
- 238000012986 modification Methods 0.000 claims description 14
- 230000004048 modification Effects 0.000 claims description 14
- 229920003023 plastic Polymers 0.000 claims description 7
- 239000004033 plastic Substances 0.000 claims description 7
- 230000000630 rising effect Effects 0.000 claims description 5
- VPWNQTHUCYMVMZ-UHFFFAOYSA-N 4,4'-sulfonyldiphenol Chemical class C1=CC(O)=CC=C1S(=O)(=O)C1=CC=C(O)C=C1 VPWNQTHUCYMVMZ-UHFFFAOYSA-N 0.000 claims description 4
- 229910000831 Steel Inorganic materials 0.000 claims description 4
- 230000003078 antioxidant effect Effects 0.000 claims description 4
- 210000000481 breast Anatomy 0.000 claims description 4
- 238000006243 chemical reaction Methods 0.000 claims description 4
- 239000003795 chemical substances by application Substances 0.000 claims description 4
- 238000013461 design Methods 0.000 claims description 4
- 238000003384 imaging method Methods 0.000 claims description 4
- 238000009413 insulation Methods 0.000 claims description 4
- 238000012544 monitoring process Methods 0.000 claims description 4
- 210000002445 nipple Anatomy 0.000 claims description 4
- 239000002994 raw material Substances 0.000 claims description 4
- 150000004819 silanols Chemical class 0.000 claims description 4
- 239000010959 steel Substances 0.000 claims description 4
- 238000005987 sulfurization reaction Methods 0.000 claims description 4
- 238000004321 preservation Methods 0.000 claims description 2
- 239000010865 sewage Substances 0.000 abstract description 7
- 230000008439 repair process Effects 0.000 abstract description 6
- 239000000126 substance Substances 0.000 abstract description 6
- 229920003020 cross-linked polyethylene Polymers 0.000 abstract description 4
- 239000004703 cross-linked polyethylene Substances 0.000 abstract description 4
- 239000000463 material Substances 0.000 abstract description 4
- 238000010438 heat treatment Methods 0.000 abstract description 2
- 239000002904 solvent Substances 0.000 abstract description 2
- 229920001187 thermosetting polymer Polymers 0.000 abstract description 2
- 239000003208 petroleum Substances 0.000 abstract 2
- IISBACLAFKSPIT-UHFFFAOYSA-N bisphenol A Chemical compound C=1C=C(O)C=CC=1C(C)(C)C1=CC=C(O)C=C1 IISBACLAFKSPIT-UHFFFAOYSA-N 0.000 abstract 1
- 238000004140 cleaning Methods 0.000 abstract 1
- 239000007924 injection Substances 0.000 abstract 1
- 238000002347 injection Methods 0.000 abstract 1
- 238000000465 moulding Methods 0.000 abstract 1
- 239000004014 plasticizer Substances 0.000 abstract 1
- 238000006116 polymerization reaction Methods 0.000 abstract 1
- SCPYDCQAZCOKTP-UHFFFAOYSA-N silanol Chemical compound [SiH3]O SCPYDCQAZCOKTP-UHFFFAOYSA-N 0.000 abstract 1
- 238000005476 soldering Methods 0.000 abstract 1
- 230000035900 sweating Effects 0.000 abstract 1
- 239000003921 oil Substances 0.000 description 8
- 239000010779 crude oil Substances 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 239000002131 composite material Substances 0.000 description 2
- 238000009412 basement excavation Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 235000012206 bottled water Nutrition 0.000 description 1
- 239000013043 chemical agent Substances 0.000 description 1
- 239000000567 combustion gas Substances 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 239000003651 drinking water Substances 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 239000007789 gas Substances 0.000 description 1
- 230000018984 mastication Effects 0.000 description 1
- 238000010077 mastication Methods 0.000 description 1
Landscapes
- Pipe Accessories (AREA)
- Lining Or Joining Of Plastics Or The Like (AREA)
Abstract
The present invention relates to crosslinking high-density polyethylene (HDPE) pipes used in a technology of old pipeline interpenetrating repair and a construction technology of old pipeline repair via using the crosslinking HDPE pipes. The present invention has the polyethylene pipe production technology that a polyethylene pipe is formed by preparing and processing component materials of HDPE resin, CPE modified resin, dibutyl ester plasticizers, vulcanizing bisphenol antioxidants, diethyl siloxane crosslinking agents and silanol accelerants. The process of the technology comprises cleaning a pipe using a pipe cleaner, inspecting the inner part of the pipe, molding the crosslinking polyethylene pipe, sweating soldering, deforming and undersizing the pipe at a constant temperature, hauling the pipe into a pipeline to be repaired, welding flanges, recovering deformation and heating, inspecting the quality of the liner tube, jointing ends and completion test. After the crosslinking polymerization of HDPE, an insoluble and infusible thermoset material is formed, of which the strength, the elastic modulus and the performance of chemical solvent resistance, oil resistance, sewage resistance, etc., are notably improved; the heat deformation temperature of the crosslinked polyethylene is raised to 120 DEG C which is 1.5 times of the heat deformation temperature of a common HDPE pipe; the performance of petroleum resistance and chemical medium resistance of the crosslinked polyethylene is better than that of the existing HDPE; the crosslinked polyethylene is applicable to a field of the application of petroleum, oilfield sewage, water injection and chemical medium pipelines.
Description
Technical field
The invention belongs to old pipeline non-excavation repairing technique field, relate in particular to a kind of crosslinked high density polyethylene pipe that in interspersed repairing used pipeline technology, uses.
Background technique
In interspersed repairing used pipeline technology, because existing on the market PE pipe can only heatproof 60 ℃ at present, only be suitable for the field such as combustion gas, domestic sewage below 60 ℃, and problems such as hot mastication and oil is molten take place easily for oil pipeline and high temperature pipe, make and intert the repairing used pipeline The Application of Technology and be subjected to very big restriction.
Summary of the invention
The objective of the invention is to overcome the deficiencies in the prior art and provide a kind of and manage on the production technology at former HDPE, make the crosslinked polyethylene pipe heatproof bring up to 100 ℃ by adding extraordinary crosslinking agent, can anti-oil and many chemical agents, it can be extended to the crosslinked high density polyethylene pipe in the application of the oil of temperature below 100 ℃, sewage, water filling, chemical pipeline.
The object of the present invention is achieved like this: adopt following each component raw materials by weight portion formulated to form by polyethylene pipe production technology commonly used:
100 parts of HDPE high-density polyethylene resins
CPE modified resin 20-50 part
Dibutyl ester class plasticizing agent 2-10 part
Sulfuration bisphenols antioxidant 0.5-8 part
Di-ethyl siloxane class crosslinking agent 2-20 part
Silanol class promoter 1-10 part
Adopt crosslinked high density polyethylene pipe to intert the construction process of repairing used pipeline to be:
The first step: reconnoitre the job site, pipelines trend is understood piping attachment, determines to have dug operating pit between the construction area pipeline opening flange of burn-oning;
Second step: adopt wiper that old pipeline is carried out pigging, remove dirt, obstacle in the pipeline, guarantee the internal surface requirement of bushing pipe construction;
The 3rd step: with imaging monitoring facilities in the central TV pipeline, pigging quality in the pipeline is checked, judged the technical requirements that whether reaches bushing pipe;
The 4th step: the crosslinked HDPE pipe that adopts constant temperature modification size reducing machine to make carries out constant temperature modification undergauge;
The 5th step: allow crosslinked HDPE pipe behind the undergauge by forming device, with the crosslinked HDPE pipe typing of undergauge;
The 6th goes on foot: the crosslinked HDPE pipe after with tractor undergauge being finalized the design is drawn in the old pipeline to be repaired;
The 7th step: adopt thermofussion welding method welding plastic flange for crosslinked HDPE pipe two ends, carry out end socket and handle;
The 8th step: give that to fill the temperature that contains crosslinking accelerator in the crosslinked HDPE pipe be 90 ℃ thermal medium, heat-insulation pressure keeping makes the crosslinked HDPE pipe of undergauge recover distortion, and carries out cross-linking reaction, and rising simultaneously is affixed in the pipeline of executing lining;
The 9th step: bulge test, check liner mass;
The tenth step: connect head with special bi-directional expansion pipe nipple and handle, recover landforms, the use of handing over.
The present invention has following good effect:
High density polyethylene (HDPE) forms insoluble not molten " thermosetting property " material after cross-linked polymeric, performances such as its intensity, Young's modulus, chemically-resistant solvent, oil resistant, resistant water significantly improve.Polyethylene thermal change type temperature after crosslinked is increased to 120 ℃, is 1.5 times of common HDPE pipe thermal change type temperature.The performance of its anti-oil and chemical mediator is more excellent than present HDPE simultaneously.The interspersed old pipe technology of repairing of heat cross-linking HDPE pipe is to be only applicable to potable water, domestic sewage, the gas pipeline scope of temperature below 60 ℃ at the interspersed pipe-repairing of common HDPE pipe, expands to the application of the oil below 100 ℃, oilfield sewage, water filling, chemical medium pipeline.It is current advanced a kind of old pipeline rehabilitation new technology.
Description of drawings
Fig. 1 is construction process figure of the present invention.
Fig. 2 is the repair structure schematic representation of crosslinked high density polyethylene (HDPE) bushing pipe of the present invention to old pipeline.
Embodiment
Embodiment 1: the present invention adopts following each component raw material formulated to form by polyethylene pipe production technology commonly used: HDPE high-density polyethylene resin double centner, 20 kilograms of CPE modified resin, 2 kilograms in dibutyl ester class plasticizing agent, 0.5 kilogram in sulfuration bisphenols antioxidant, 2 kilograms of di-ethyl siloxane class crosslinking agents, 1 kilogram of silanol class promoter.
As shown in Figure 1, 2, Φ 188 * 6 crosslinked HDPE pipes 3 that the present invention produces by above prescription intert and repair Φ 219 * 18 filling pipes 4, and concrete construction process is as follows:
The first step: reconnoitre the job site, pipelines trend is understood piping attachment, determines to have dug operating pit between the construction area pipeline opening flange 2 of burn-oning;
Second step: adopt wiper that old pipeline 4 is carried out pigging, remove dirt, obstacle in the pipeline, guarantee the internal surface requirement of bushing pipe construction;
The 3rd step: with imaging monitoring facilities in the CCTV pipeline, pigging quality in the pipeline is checked, judged the technical requirements that whether reaches bushing pipe;
The 4th step: the crosslinked HDPE pipe that adopts constant temperature modification size reducing machine to make carries out constant temperature modification undergauge;
The 5th step: allow crosslinked HDPE pipe behind the undergauge by forming device, with the crosslinked HDPE pipe typing of undergauge;
The 6th goes on foot: the crosslinked HDPE pipe 3 after with tractor undergauge being finalized the design is drawn in the old pipeline 4 to be repaired;
The 7th step: adopt thermofussion welding method welding plastic flange 1 for crosslinked HDPE pipe two ends, carry out end socket and handle;
The 8th step: give in the crosslinked HDPE pipe and fill the thermal medium (90 ℃ of temperature) that contains crosslinking accelerator, heat-insulation pressure keeping makes the crosslinked HDPE pipe of undergauge recover distortion, and carries out cross-linking reaction, and rising simultaneously is affixed in the pipeline of executing lining;
The 9th step: bulge test, check liner mass;
The tenth step: connect head with special bi-directional expansion pipe nipple and handle, recover landforms, the use of handing over.
As shown in Figure 2, intert the crosslinked HDPE external diameter of pipe of usefulness at least than the internal diameter of the pipeline interference 3%～5% of bushing pipe.Interting when executing lining, crosslinked HDPE pipe 3 through constant temperature undergauge modification after, crosslinked HDPE pipe diameter reduces 15%～20%, could guarantee successfully to pull in the pipeline of executing lining, suitable caliber DN100～DN1200 once executes serving as a contrast length about 1000 meters.Interting when executing lining, the pipe applications wiper that is served as a contrast carries out pigging, removes all dirts and obstacle in the pipeline, so that execute lining.Crosslinked HDPE pipe is executed when serving as a contrast in the pipeline interting, and gives heating in the crosslinked HDPE pipe, pressurization, allows it recover modification, and the size of interference guarantees that crosslinked HDPE pipe rising can be close to the inner-walls of duct of executing lining, forms the pipe-in-pipe composite structure.Crosslinked HDPE pipe guarantees that constant temperature at 20～50 ℃, makes crosslinked HDPE pipe be easy to modification when constant temperature modification undergauge, but crosslinked HDPE do not damage, and is also not crosslinked ahead of time.Crosslinked HDPE pipe is executed when serving as a contrast in the steel pipe, will weld plastics flange with thermofussion welding at crosslinked HPDE pipe two ends, is beneficial to ferrule.Crosslinked HDPE pipe interts to be executed when serving as a contrast in the steel pipe, and give in the crosslinked HDPE pipe and charge into 90 ℃ of hot water, pressure-maintaining and heat-preservation, it is crosslinked to allow plastic tube carry out, and crosslinking time is more than 4 hours, and the degree of cross linking reaches 68%～82%.The pipeline of executing lining constitutes steel-plastic composite pipe, the heatproof of crosslinked HDPE pipe, corrosion-resistantly all is better than common HDPE pipe, and the pipeline that this technology is executed lining is excellent in withstand voltage, heatproof, aspect corrosion-resistant.
In the oilfield sewage of salinity 180,000,100 ℃ of following test effects are satisfied, therefore satisfy the oil-field flooding environmental applications.
As shown in Figure 2, in the structure after the present invention repairs, 1 is crosslinked HDPE flange, and 2 is steel flanges, and 3 is crosslinked HDPE pipe, the 4 old pipelines for reparation.
Embodiment 2: the present invention adopts following each component raw material formulated to form by polyethylene pipe production technology commonly used: HDPE high-density polyethylene resin double centner, 50 kilograms of CPE modified resin, 10 kilograms in dibutyl ester class plasticizing agent, 8 kilograms in sulfuration bisphenols antioxidant, 20 kilograms of di-ethyl siloxane class crosslinking agents, 10 kilograms of silanol class promoter.
Φ 154 * 5 crosslinked HDPE pipes by above prescription is produced intert and repair Φ 159 * 6 high water-content crude oil pipelines, and concrete construction process is as follows:
The first step: reconnoitre the job site, pipelines trend is understood piping attachment, determines to have dug operating pit between the construction area pipeline opening flange of burn-oning;
Second step: adopt wiper that old pipeline is carried out pigging, remove dirt, obstacle in the pipeline, guarantee the internal surface requirement of bushing pipe construction;
The 3rd step: with imaging monitoring facilities in the CCTV pipeline, pigging quality in the pipeline is checked, judged the technical requirements that whether reaches bushing pipe;
The 4th step: the crosslinked HDPE pipe constant temperature modification undergauge that adopts constant temperature modification size reducing machine to make;
The 5th step: allow crosslinked HDPE pipe behind the undergauge by forming device, with the crosslinked HDPE pipe typing of undergauge;
The 6th goes on foot: the crosslinked HDPE pipe after with tractor undergauge being finalized the design is drawn in the old pipeline to be repaired;
The 7th step: adopt thermofussion welding method welding plastic flange for crosslinked HDPE pipe two ends, carry out end socket and handle;
The 8th step: give in the crosslinked HDPE pipe and fill the thermal medium (90 ℃ of temperature) that contains crosslinking accelerator, heat-insulation pressure keeping makes the crosslinked HDPE pipe of undergauge recover distortion, and carries out cross-linking reaction, and rising simultaneously is affixed in the pipeline of executing lining;
The 9th step: bulge test, check liner mass;
The tenth step: connect head with special bi-directional expansion pipe nipple (patent) and handle, recover landforms, the use of handing over.
In moisture 85% crude oil medium, contain 0.3%H
2S, 100 ℃ of test effects of temperature are remarkable, therefore use in the high water-content crude oil pipeline of oil field, satisfy technological requirement fully.
The interspersed repairing used pipeline construction process of crosslinked high density polyethylene (HDPE) (HDPE) pipe is applicable to interior reparation of old pipeline of the various materials of DN100～DN1200.Once lining is gone into about 1000 meters of length.
Claims (6)
1, a kind of crosslinked high density polyethylene pipe is characterized in that: adopt following each component raw materials by weight portion formulated to form by polyethylene pipe production technology commonly used:
100 parts of HDPE high-density polyethylene resins
CPE modified resin 20-50 part
Dibutyl ester class plasticizing agent 2-10 part
Sulfuration bisphenols antioxidant 0.5-8 part
Di-ethyl siloxane class crosslinking agent 2-20 part
Silanol class promoter 1-10 part
2, a kind of construction process that adopts the interspersed repairing used pipeline of the described crosslinked high density polyethylene pipe of claim 1 is characterized in that:
The first step: reconnoitre the job site, pipelines trend is understood piping attachment, determines to have dug operating pit between the construction area, and the pipeline opening flange (1) of burn-oning,
Second step: adopt wiper that old pipeline (4) is carried out pigging, remove dirt, obstacle in the pipeline, guarantee the internal surface requirement of bushing pipe construction,
The 3rd step: with imaging monitoring facilities in the central TV pipeline, pigging quality in the pipeline is checked, judged the technical requirements that whether reaches bushing pipe,
The 4th step: the crosslinked HDPE pipe (3) that adopts constant temperature modification size reducing machine to make carries out constant temperature modification undergauge,
The 5th step: allow crosslinked HDPE pipe behind the undergauge by forming device, with the crosslinked HDPE pipe typing of undergauge,
The 6th goes on foot: the crosslinked HDPE pipe after with tractor undergauge being finalized the design is drawn in the old pipeline to be repaired,
The 7th step: adopt thermofussion welding method welded flange (1) for crosslinked HDPE pipe two ends, carry out end socket and handle,
The 8th step: give that to fill the temperature that contains crosslinking accelerator in the crosslinked HDPE pipe be 90 ℃ thermal medium, heat-insulation pressure keeping makes the crosslinked HDPE pipe of undergauge recover distortion, and carries out cross-linking reaction, and rising simultaneously is affixed in the pipeline of executing lining,
The 9th step: bulge test, check liner mass,
The tenth step: connect head with special bi-directional expansion pipe nipple and handle, recover landforms, the use of handing over.
3, the construction process of the interspersed repairing used pipeline of a kind of crosslinked high density polyethylene pipe according to claim 2, it is characterized in that: the crosslinked HDPE external diameter of pipe of interspersed usefulness is than the internal diameter of the pipeline interference 3%～5% of bushing pipe.
4, the construction process of the interspersed repairing used pipeline of a kind of crosslinked high density polyethylene pipe according to claim 2, it is characterized in that: interting when executing lining, after the crosslinked HDPE pipe process constant temperature undergauge modification, crosslinked HDPE pipe diameter reduces 15%～20%, caliber DN100～the DN1200 that is suitable for once executes lining length at 1000 meters.
5, the construction process of the interspersed repairing used pipeline of a kind of crosslinked high density polyethylene pipe according to claim 2 is characterized in that: crosslinked HDPE pipe guarantees that constant temperature is at 20～50 ℃ when constant temperature modification undergauge.
6, the construction process of the interspersed repairing used pipeline of a kind of crosslinked high density polyethylene pipe according to claim 2, it is characterized in that: crosslinked HDPE pipe interts to be executed when serving as a contrast in the steel pipe, give in the crosslinked HDPE pipe and charge into 90 ℃ of hot water, pressure-maintaining and heat-preservation, it is crosslinked to allow plastic tube carry out, crosslinking time is more than 4 hours, and the degree of cross linking reaches 68%～82%.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 03126240 CN1272564C (en) | 2003-07-04 | 2003-07-04 | Cross linking high density polyethylene pipe and construction process of its alternuting repairing old pipe line |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 03126240 CN1272564C (en) | 2003-07-04 | 2003-07-04 | Cross linking high density polyethylene pipe and construction process of its alternuting repairing old pipe line |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1514157A CN1514157A (en) | 2004-07-21 |
| CN1272564C true CN1272564C (en) | 2006-08-30 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN 03126240 Expired - Fee Related CN1272564C (en) | 2003-07-04 | 2003-07-04 | Cross linking high density polyethylene pipe and construction process of its alternuting repairing old pipe line |
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| CN (1) | CN1272564C (en) |
Families Citing this family (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CA2741962C (en) * | 2008-10-31 | 2017-08-01 | Borealis Ag | Cross-linked polyethylene pipe |
| CN101805472B (en) * | 2010-04-20 | 2013-04-17 | 湖州环友橡塑材料有限公司 | Regeneration high-density polyethylene (HDPE) particle used for tubings and manufacture method thereof |
| CN102128309A (en) * | 2010-10-29 | 2011-07-20 | 广东联塑科技实业有限公司 | Non-excavation steel pipe repair technology |
| NL1039503C2 (en) * | 2012-03-29 | 2013-12-30 | Wavin Bv | Device and method for installing a compact pipe within a pipeline. |
| CN103601943B (en) * | 2013-08-16 | 2016-02-24 | 安徽省振云塑胶有限公司 | A kind of crosslinked PE water service pipe |
| CN104405998A (en) * | 2014-10-16 | 2015-03-11 | 烟台中泰管业工程有限公司 | Repairing method for adding liner on underground pipe |
| CN104864176B (en) * | 2014-11-24 | 2016-11-30 | 长春工业大学 | A kind of installation method of oil field gathering and transportation composite metal plastic pipe |
| CN104747859B (en) * | 2015-03-20 | 2017-01-25 | 辽宁三和环境工程有限公司 | Excavation-free pipeline quick repair method and traction rod for same |
| CN107940161A (en) * | 2017-10-09 | 2018-04-20 | 中国石油化工股份有限公司 | Pipe repairing method and pipeline for pipeline rehabilitation are met and discussed connection structure |
| CN109578708A (en) * | 2018-10-30 | 2019-04-05 | 江苏联冠兆星石化科技有限公司 | Unwrapping method in a kind of oriented tube |
| CN110159867A (en) * | 2019-06-05 | 2019-08-23 | 保定市金马漏水检测有限公司 | Intert PE pipe repairing method in no-dig technique |
| CN112780878A (en) * | 2021-01-15 | 2021-05-11 | 中国石油化工股份有限公司西北油田分公司 | Process and device for repairing old pipeline by pipeline lining inserting method |
-
2003
- 2003-07-04 CN CN 03126240 patent/CN1272564C/en not_active Expired - Fee Related
Also Published As
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| CN1514157A (en) | 2004-07-21 |
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Address after: 457001, Henan, Puyang province Pu east industrial agglomeration area south of the North Ring Road Patentee after: RICH HIGH-TECH Co.,Ltd. Address before: 457001, Puyang, Henan province Pu Industrial agglomeration zone, Gaoyang Avenue and new East Road intersection 200 meters West Patentee before: Henan Rich Pipeline Engineering Technology Co.,Ltd. Address after: 457001, Puyang, Henan province Pu Industrial agglomeration zone, Gaoyang Avenue and new East Road intersection 200 meters West Patentee after: HENAN RICH PIPELINE ENGINEERING TECHNOLOGY Co.,Ltd. Address before: 457000 No. 109, Henan, Puyang, Puyang Zhongyuan cleaning and corrosion protection Co., Ltd. Patentee before: PUYANG ZHONGYUAN RUICHI CLEANI |
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Denomination of invention: Cross linking high density polyethylene pipe and construction process of its alternuting repairing old pipe line Effective date of registration: 20160701 Granted publication date: 20060830 Pledgee: Puyang City Rural Credit Cooperatives Pledgor: RICH HIGH-TECH Co.,Ltd. Registration number: 2016410000011 |
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Denomination of invention: Cross linking high density polyethylene pipe and construction process of its alternuting repairing old pipe line Effective date of registration: 20170809 Granted publication date: 20060830 Pledgee: Bank of China Limited by Share Ltd. Puyang science and technology new village branch Pledgor: RICH HIGH-TECH Co.,Ltd. Registration number: 2017410000021 |
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Denomination of invention: Cross linking high density polyethylene pipe and construction process of its alternuting repairing old pipe line Effective date of registration: 20200408 Granted publication date: 20060830 Pledgee: Bank of China Limited by Share Ltd. Puyang branch Pledgor: RICH HIGH-TECH Co.,Ltd. Registration number: Y2020990000291 |
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