CN1704639A - Three-layer structured polypropylene anticorrosive technology for steel buried transportation pipe - Google Patents
Three-layer structured polypropylene anticorrosive technology for steel buried transportation pipe Download PDFInfo
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- CN1704639A CN1704639A CN 200410024627 CN200410024627A CN1704639A CN 1704639 A CN1704639 A CN 1704639A CN 200410024627 CN200410024627 CN 200410024627 CN 200410024627 A CN200410024627 A CN 200410024627A CN 1704639 A CN1704639 A CN 1704639A
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Abstract
This invention relates to a polypropylene aseptic technique, particular to a steel buried conveyer tube aseptic technique, which comprises the following steps: descaling the surface of the steel tube, coating on the surface, checking the aseptic tube and processing the cap. By using the new material and adjusting the technique, the aseptic layer can be fit for higher agent temperature and environmental temperature, getting higher aseptic steel pipe.
Description
Technical field
The present invention relates to a kind of aseptic technic, particularly a kind of steel buried ground conveyance conduit three-decker polypropylene aseptic technic.
Background technique
Traditional steel pipe polyethylene is anticorrosion good insulation properties, only be suitable for and the lower pipeline corrosion protection of flowing medium temperature but its temperature tolerance is low, and generally be below 70--80 ℃, can not adapt to and carry about 100 ℃ flowing medium.And in the summer of tropical and subtropical zone, the polyethylene anti-corrosion pipe is when outdoor construction, steel tube surface temperature about 50 ℃ make polyethylene anticorrosive coating greatly reduce mechanical strength and with the bonding force of steel pipe, there are the problems referred to above in the use, therefore be necessary to realize having higher level, wider applicability is arranged,, adapt to needs to tropic countries outlet anti-corrosive steel tube to adapt to China's pipeline needs already.
Summary of the invention
The present invention has overcome deficiency of the prior art, traditional steel pipe polyethylene aseptic technic is improved, by selecting new material for use, adjusting process, make applicable higher medium temperature of anticorrosive coat and ambient temperature, satisfied special user's requirement in this respect.And make domestic consumer in the situation that does not increase expense basically, under the situation that does not reduce quality aspect other, can obtain the higher anti-corrosive steel tube of intensity.
Polypropylene itself has higher softening point than polyethylene, utilize this characteristics, and improve other performances, be used for doing pipeline anticorrosion coating, just can guarantee to have good insulating property simultaneously, increase substantially the temperature tolerance of anticorrosive coat, make its can be applicable to medium pipeline about 110 ℃ anticorrosion in, this has the construction unit of burying the geothermal water pipeline for power station, chemical plant and other, and very strong reality needs are arranged.China's oil industry investment construction oil field in overseas in recent years particularly, the channelling project is more, and mostly in tropic countries, the area that ambient temperature is higher.After adopting the polypropylene pipe aseptic technic,, guarantee the inhibitor effectiveness of overseas investment pipeline, stronger reality needs are also arranged for the outlet anti-corrosive steel tube.
The conveyance conduit three-decker polypropylene aseptic technic technological process of steel buried of the present invention ground is as follows:
Inlet pipe → inlet pipe quality inspection → surface and oil contaminant cleans → goes up pipe → preheating → impeller blasting → rust cleaning quality inspection → micronic dust cleaning → heating → electrostatic powder spraying → adhesive applicating → polypropylene coating → otch → cooling → electrical spark and stop leakage in the roof → leak source repairing → termination polishing → spray mark → installation coating protection guard ring → production tube stacking
Specific embodiment
(1), steel tube surface rust cleaning
1, inlet pipe
Light pipe enters the inlet pipe platform, by inlet pipe quality inspection control zone the surface of light pipe is checked, main inspection item comprises weld bead height, falls the hole, etch pit, groove damage, pipe end ovality, body tortuosity and steel tube surface greasy dirt etc.; Pipe number, pipe range, grade of steel, wall thickness, heat (batch) number, date of manufacture, quantity etc. are carried out record.The steel pipe that does not meet the coating requirement will withdraw from inlet pipe platform, otherwise processed.
Steel tube surface must be carried out soda acid and clean if greasy dirt is arranged.The Guan Caineng that cleans up eliminates rust.
2, preheating
Check that the qualified light pipe in back enters the intermediate frequency preheating oven through the rust cleaning drive line.According to demand of technical standard, the body temperature will be heated to 40～60 ℃, dispels the inside and outside moisture of pipe.The preheating of the pre-thermal recovery Medium frequency induction of this production line steel pipe.This place is by rust cleaning quality inspection control zone control preheating temperature.
3, impeller blasting
Light pipe after the heating enters in the ballasting rust remover through the rust cleaning drive line, two high-power down throwing impeller heads are dished out steel sand, shot and are hit steel tube surface and eliminate rust, rust cleaning back steel tube surface turbidity test can reach the standard-required of Sa2.5 level, and depth of abrasion pattern generally reaches 50 μ m-75 μ m.
4, rust cleaning quality inspection
Steel pipe behind the impeller blasting enters halfpace through the rust cleaning drive line, by rust cleaning quality inspection control zone monitoring, check its tube quality, surface cleanness (should reach the Sa2.5 level), depth of abrasion pattern (should reach 50 μ m-75 μ m) by root, to hang back into the pipe platform the steel pipe that does not reach standard-required, again eliminate rust, surperficial defectiveness light pipe then withdraws from production line; The qualified steel pipe that eliminates rust enters the coating production line.
(2), steel tube surface coat operations process
1, micronic dust is handled
The qualified coated drive line of light pipe to the micronic dust in rust cleaning back is handled station, adopts the method for twice purging of pressurized air, removes steel sand dust and some surperficial small dust in the back pipe that eliminates rust, and is beneficial to improve adhesive force of coatings.
2, Frequency Induction Heating
Micronic dust is handled the back steel pipe and is entered the coating drive line, and light pipe carries out Frequency Induction Heating through intermediate frequency coil earlier before coating.Heating-up temperature need satisfy the needs of coating.
3, epoxy powder electrostatic spraying
Steel pipe after the heating enters the epoxy powder spray booth by the coating drive line, and the epoxy powder of having static is sprayed on the steel tube surface equably, and gel in scheduled time, reaches the coating requirement.Recycling and the dust treatment of powder all reaches national requirements for environmental protection.
4, copolymer adhesive/polypropylene coating
After apolegamy processing was mixing, adhesive and PP GRANULES were extruded into the sheet head through the inner heating of extruder and by screw rod respectively, pass through Guide roller, nip drum and dragging roller again, can guarantee that adhesive and crystalline p p sheet are even, side direction is wrapped in steel tube surface.
Steel pipe heating-up temperature, steel pipe motion speed, spray gun quantity, spray gun pressure, extruder rotating speed, each section of the extruder temperature control process parameter of attaching most importance to carries out prosecution by the special messenger, to ensure the quality of products.
5, otch
After coating, with special cutter tube and tube joint polypropylene coating is cut off before the cooling, tube and tube is separated.
6, water-cooled
After technologies such as heating in medium frequency, electrostatic spraying, adhesive and polypropylene coating, the steel pipe that coating is good enters drive line water cooling part.Cooling circulating water evenly is sprayed at the coating tube-surface makes coating cool off hardening gradually, and outlet body temperature is reached about 50 ℃.
(3), anti-corrosion pipe detects
To pass through online electrical spark characterization processes after the cooling of polypropylene anti-corrosion pipe.The 25kV high direct voltage is crossed every square millimeter of surface of anti-corrosion pipe by the special purpose copper sweeping, if there is underproof leak source to exist, and the electrical spark instrument acoustooptic alarm simultaneously of stopping leakage in the roof, the monitor staff marks with Awaiting Overhaul near the leak source position.
Steel tube surface polypropylene coating quality is comprised outward appearance, thickness, peeling strength, the finding leak source that detects anti-corrosion pipe and is repaired, stays end length etc. by the monitoring of production tube monitored space.Anti-corrosion pipe through being up to the standards stays end to handle by the termination grinding apparatus, and defective Guan Ze places in the zone to be checked, handles at any time.This monitored space quality inspection record carries out record to being coated with tubine, and fills in sign.Comprise pipe range, pipe number, quantity, outward appearance, thickness, cohesive force etc.
(4), handle the termination
Qualified on inspection anti-corrosion pipe enters the termination treatment zone.The termination processing equipment can step-less adjustment polishing stay end length and grinding angle, that can satisfy that the client proposes stays the end requirement.
Production tube will be sprayed qualified pipe sign and by staff's mounting pipe end protector (requirement being arranged as the client) and coating protection guard ring, be deposited in then on the production tube buttress, get final product shipping after the assay was approved through the project of laboratory inspection.
Claims (3)
1. an aseptic technic is characterized in that adopting three-decker polypropylene aseptic technic.
2. a kind of aseptic technic as claimed in claim 1 is characterized in that being applied to steel buried ground conveyance conduit.
3. a kind of aseptic technic as claimed in claim 1 is characterized in that technology mainly comprises the steel tube surface rust cleaning, and steel tube surface coat operations process, anti-corrosion pipe detect and handle the termination.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200410024627 CN1704639A (en) | 2004-05-25 | 2004-05-25 | Three-layer structured polypropylene anticorrosive technology for steel buried transportation pipe |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200410024627 CN1704639A (en) | 2004-05-25 | 2004-05-25 | Three-layer structured polypropylene anticorrosive technology for steel buried transportation pipe |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN1704639A true CN1704639A (en) | 2005-12-07 |
Family
ID=35576738
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 200410024627 Pending CN1704639A (en) | 2004-05-25 | 2004-05-25 | Three-layer structured polypropylene anticorrosive technology for steel buried transportation pipe |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1704639A (en) |
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100359235C (en) * | 2005-12-15 | 2008-01-02 | 四川石油管理局 | Three-layer cold-tape hot-winding corrosion preventing technology for steel pipe |
| CN101655179B (en) * | 2008-11-04 | 2011-04-06 | 中油管道防腐工程有限责任公司 | Novel coating process of pipe anti-corrosion layer with three-layer structure |
| CN102107176A (en) * | 2010-09-02 | 2011-06-29 | 中油管道防腐工程有限责任公司 | Coating process for pipeline three-layer structural anticorrosive coating |
| CN102235015A (en) * | 2010-04-28 | 2011-11-09 | 上海建冶科技工程股份有限公司 | Anticorrosive protecting method for exterior surface of steel pipe pile |
| CN102896786A (en) * | 2012-09-13 | 2013-01-30 | 安徽省宏源管道科技有限公司 | Powder interior repairing machine and repairing method thereof |
| CN103016906A (en) * | 2012-12-25 | 2013-04-03 | 宝鸡石油钢管有限责任公司 | Outer surface 3PE anti-corrosion production line for continuous pipe and anti-corrosion process |
| CN106415106A (en) * | 2014-03-14 | 2017-02-15 | 尼古拉·尼古拉耶维奇·彼得罗夫 | Composite and waterproof materials, coating and method for protecting structures and buildings |
| CN112682618A (en) * | 2020-10-23 | 2021-04-20 | 中投(天津)智能管道股份有限公司 | three-PE corrosion prevention method for steel outer protection pipe |
-
2004
- 2004-05-25 CN CN 200410024627 patent/CN1704639A/en active Pending
Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100359235C (en) * | 2005-12-15 | 2008-01-02 | 四川石油管理局 | Three-layer cold-tape hot-winding corrosion preventing technology for steel pipe |
| CN101655179B (en) * | 2008-11-04 | 2011-04-06 | 中油管道防腐工程有限责任公司 | Novel coating process of pipe anti-corrosion layer with three-layer structure |
| CN102235015A (en) * | 2010-04-28 | 2011-11-09 | 上海建冶科技工程股份有限公司 | Anticorrosive protecting method for exterior surface of steel pipe pile |
| CN102107176A (en) * | 2010-09-02 | 2011-06-29 | 中油管道防腐工程有限责任公司 | Coating process for pipeline three-layer structural anticorrosive coating |
| CN102107176B (en) * | 2010-09-02 | 2013-08-28 | 中油管道防腐工程有限责任公司 | Coating process for pipeline three-layer structural anticorrosive coating |
| CN102896786A (en) * | 2012-09-13 | 2013-01-30 | 安徽省宏源管道科技有限公司 | Powder interior repairing machine and repairing method thereof |
| CN102896786B (en) * | 2012-09-13 | 2015-07-22 | 安徽省宏源管道科技有限公司 | Powder interior repairing machine and repairing method thereof |
| CN103016906A (en) * | 2012-12-25 | 2013-04-03 | 宝鸡石油钢管有限责任公司 | Outer surface 3PE anti-corrosion production line for continuous pipe and anti-corrosion process |
| CN106415106A (en) * | 2014-03-14 | 2017-02-15 | 尼古拉·尼古拉耶维奇·彼得罗夫 | Composite and waterproof materials, coating and method for protecting structures and buildings |
| CN106415106B (en) * | 2014-03-14 | 2019-03-26 | 尼古拉·尼古拉耶维奇·彼得罗夫 | For protecting the waterproof composite material, coating and method of structure and building |
| CN112682618A (en) * | 2020-10-23 | 2021-04-20 | 中投(天津)智能管道股份有限公司 | three-PE corrosion prevention method for steel outer protection pipe |
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