CN101344207A - Maintenance construction method for anti-corrosion metal pipeline - Google Patents
Maintenance construction method for anti-corrosion metal pipeline Download PDFInfo
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- CN101344207A CN101344207A CNA2007101306353A CN200710130635A CN101344207A CN 101344207 A CN101344207 A CN 101344207A CN A2007101306353 A CNA2007101306353 A CN A2007101306353A CN 200710130635 A CN200710130635 A CN 200710130635A CN 101344207 A CN101344207 A CN 101344207A
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Abstract
The invention relates to a method for the field construction of broken pipelines, in particular to a method for the maintenance and construction of anticorrosive metal pipelines. Aiming at the situation that anticorrosive layers of the pipelines made of anticorrosive materials are difficult to be removed during the breakage construction in the prior art, the method for the maintenance and construction of the anticorrosive metal pipelines of the invention utilizes a far infrared ray to carry out heating to the breakage, thus being convenient for incision and repair, not only saving time and labor during the process, but also having high safety coefficient, and not causing occurrence of the dangers detonated by air leakage.
Description
Technical field
The present invention relates to a kind of method of damaged pipeline field construction, specifically is a kind of maintenance construction method for anti-corrosion metal pipeline.
Background technique
At present crude oil, product oil, the rock gas of China's oil petrochemical industry are transported to refinery factory and are being adopted buried steel pipeline to carry from the oil field, and this method is quick, safety, convenience, operation cost are low.Train, automobile land transport mode have now been eliminated substantially.Should carry out the top layer preservative treatment when steel pipe of conveyance fluid buries ground so, so People's Republic of China's oil and gas industry has been formulated standard.Code name: Sy/T0413-2002, title " buried steel pipeline polyethylene anticorrosive coating technical standard ".PE is exactly the poly english abbreviation letter of steel pipe external anti-corrosion layer.So-called 2PE is exactly at the outer 2 floor height molecule anti-corrosion materials that apply of steel pipe; 3PE is exactly at the outer 3 floor height molecule anti-corrosion materials that apply of steel pipe.
When flowing medium runs into outside destroy or conventional aging damaged normal the conveying in the running, cause escape of liquid, carrying the pipeline of oil gas, under the state of newly-increased by-pass line, need not stop vapour, oil carries out interface and connects, at this moment it is very solid to be coated on the outer field macromolecule anticorrosive coat of steel pipe, and operator can't remove external anti-corrosion layer and carry out the leak stopping joint weld at short notice.The method of spreading is skin is burnt or to be wiped off with blade for a long time and handle with flame gun.Therefore, this factor of safety of spreading way is very low, careless slightlyly will cause blast casualty accident on fire, and does not up to the present domesticly have still that good way solves that anticorrosive coat is removed and the way of exposing steel tube surface.
Summary of the invention
The invention provides a kind of maintenance construction method for anti-corrosion metal pipeline, it had both solved the low deficiency of construction safety coefficient under the prior art, and operated time saving and energy savingly, fully satisfied the requirement of repairing damaged pipeline fast.
The technical solution adopted for the present invention to solve the technical problems is:
A kind of maintenance construction method for anti-corrosion metal pipeline may further comprise the steps:
A, fed sheet of a media in the pipeline is reduced pressure, breakage spot is carried out shutoff;
B, breakage spot is coated the Far-infrared Heating cover, and, heat according to anticorrosive coat material adjustment heating frequency;
C, pull down the Far-infrared Heating cover, cut anticorrosion top layer and peel off;
D, breakage spot is welded repaired mouth;
E, welding detect qualified after, carry out preservative treatment.
In the described steps A breakage spot is carried out shutoff, adopt the method for using Zhuan Yong Mu Xi.
Among the described step B, the pipeline heating-up temperature of PE anti-corrosion material is 170-180 degree centigrade, and the pipeline heating-up temperature of epoxy coal anti-corrosion material is adjusted to 130-140 degree centigrade.
Described step D is specially: the steel pipe skin patch that will get ready in advance is fixed on the body breakage spot, the weld bond periphery is with sticking with paste refractory mortar, with the patch seam, check that the complete patch of seam does not have gas leak phenomenon with electric welding machine, with wire brush and angle grinding machine with the processing such as derust of weld bond and surface.
A kind of maintenance construction method for anti-corrosion metal pipeline operation of the present invention saves time, laborsaving, safety.With the anticorrosion gas pipeline of φ 325mm3PE gas leakage repairing is row: anticorrosive coat heats, peels off, clearance time: 10 minutes, and during welding: 200 * 300 (mm) 10 minutes, anticorrosion again 5 minutes, anticorrosion area 0.5m
2Finished the work in shared 25 minutes.
Embodiment
Below in conjunction with specific embodiment, a kind of maintenance construction method for anti-corrosion metal pipeline of the present invention is described in detail.
With the gas pipeline is example:
When the anxious repairing of gas leakage took place the 3PE corrosion-resistant gas pipeline that buries ground: the emergency first-aid repair personnel should get following article ready and reach the spot.
1, liquefied gas tank;
2, flame gun;
3, teflon pressure roller and pliers energetically;
4, 〉=the wide shrink belt of 200mm, mend and to hinder the glue rod, mend and hinder sheet and fixed plate;
5, solvent-free two component epoxy priming paint and annex;
6, wire brush;
7, angle grinding machine, flat mouthful bottle opener;
8, textile wiper, gloves;
9, with gas pipeline with wall thickness steel tube skin (steel patch);
10, electric welding machine, welding rod, acetylene gas cutting torch etc.;
11, the power line of 220v power supply and respective length;
12,220v anticorrosive coat surface treatment control box;
13, the caliber stainless steel infrared heater that adapts to each specification;
14, steel disc scraper, paper knife;
15, special-purpose cutting corrosion-resistant cutter;
16, square, sheet type, round Mu Xi (length 100mm) that soaks with fire-retardant agent liquid
17, far infrared thermometric instrument;
Two, repairing operating procedure process
1, notice transmission ﹠ distribution department carries out step-down to the conveyance conduit that has an accident earlier;
2, hand excavation's pipeline that goes out to leak gas makes its whole body exposed;
3, the appointees that worn gas mask are used for cloth and wipe clean damaged body body surface, when cooperating fire-fighting trickle dilution gas leakage with specially breakage spot being carried out shutoff in advance with wooden Xi.Other staff deliver to the next door by logical 200V power supply.
4, by logical control box, the assembling infrared heater, and fix, heating being coated on the outer field body of damaged face, PE anticorrosive coat body temperature is adjusted to 170-180 degree centigrade, and the anticorrosion temperature of epoxy coal is adjusted to 130-140 degree centigrade.
5, during the scheduled time to be reached (general 4-5 minute), powered-down removes heater rapidly, the pipeline top layer is removed (remove corresponding anticorrosive coat area by welding requirements, scrape off epoxy layer) with paper knife, scraper, special-purpose cutter, pliers.
6, the steel pipe skin (patch) that will get ready in advance is fixed on the body breakage spot, and weld bond periphery is with sticking with paste refractory mortar, with electric welding machine with the patch seam.
7, check that the complete patch of seam does not have gas leak phenomenon, with wire brush and angle grinding machine with the processing such as derust of weld bond and surface.
8, with the liquid gas spray gun with about patch place cushioning to 70 ℃, the brushing epoxy paint is coated with the breakage spot surface gaps thermosol then and fills.Select for use the pyrocondensation tape wrap to coat the breakage spot size, will be with all heating simultaneously of glue-line and epoxy layer when coating construction, suitably firmly tension is twined, and then tape wrap is fixed with fixed plate by mouth.To anticorrosion part double heating, its contraction is finished again.Periphery evenly overflows till the glue.
9, mend is carried out the electrification flower and detect, no leak source position is qualified, otherwise heavily comes.
Three, when gas pipeline wiring otch anticorrosive coat is handled, method is being used the special device interface then again with reference to 1: 0 5th, and the top layer was anticorrosion with the 8th after interface finished.
Four, the supporting table of repaired item specification series commonly used
| Sequence number | Infrared heater size (internal diameter) mm | Adapt to steel pipe specification (mm) | Anticorrosion band specification width * thickness | Epoxy paint (g) | The flame gun specification |
| 1 | φ63×150 | φ57-60 | 50*2.0 | 30 | φ35 |
| 2 | φ95×150 | φ89 | 50*2.0 | 30 | φ35 |
| 3 | φ114×200 | φ108 | 100*2.0 | 30 | φ35 |
| 4 | φ165×200 | φ159 | 100*2.0 | 30 | φ35 |
| 5 | φ174×200 | φ168 | 100*2.0 | 30 | φ35 |
| 6 | φ226×250 | φ219 | 150*2.2 | 40 | φ40 |
| 7 | φ252×250 | φ245 | 150*2.2 | 40 | φ40 |
| 8 | φ280×300 | φ273 | 150*2.2 | 40 | φ40 |
| 9 | φ332×300 | φ325 | 200*2.2 | 40 | φ40 |
| 10 | φ367×400 | φ355.6 | 200*2.2 | 40 | φ40 |
| 11 | φ384×400 | φ377 | 200*2.2 | 40 | φ40 |
| 12 | φ414×400 | φ406.4 | 200*2.2 | 50 | φ40 |
| 13 | φ434×400 | φ426 | 200*2.2 | 50 | φ40 |
| 14 | φ465×400 | φ457 | 200*2.2 | 50 | φ40 |
| 15 | φ516×400 | φ508 | 200*2.2 | 50 | φ40 |
| 16 | φ537×400 | φ529 | 200*2.2 | 50 | φ40 |
| 17 | φ618×500 | φ610 | 250*2.2 | 60 | φ50 |
| 18 | φ638×500 | φ630 | 250*2.2 | 60 | φ50 |
| 19 | φ720×500 | φ711 | 250*2.2 | 60 | φ50 |
| 20 | φ829×500 | φ820 | 250*2.2 | 60 | φ50 |
Five, worker's process anticorrosive coat treatment process technical order
As everyone knows, gas leakage repairing of spreading and band gas wiring unsafe factor are very big, and the burning-point of rock gas only is 650 ℃.The liquid gas burning-point is 539 ℃.Particularly the anticorrosive coating peeling during steel road electric welding leak stopping is very difficult, can't handle with naked light.Therefore our new process of releasing and by test for several times, fast saves trouble at result on trial safety.Peeling off the anticorrosive coat welding procedure with infrared heating 3PE or 2PE is the safety operation of carrying out with reference to following technical data:
1, burning-point: 650 ℃.
539 ℃ of liquefied petroleum gas (LPG) burning-points.
Fire retardant soaks and surpasses 8 hours De Mu Xi burning-points: 350 ℃
The thermosol softening point of 3PE, 2PE anticorrosive coat mull technique is 180 ℃.
All adopt infrared cushioning to send out to make, and anticorrosive coat is softening reaches that easily to peel off effect as safe as a house, is not all reaching the article burning-point below 250 ℃.
1, anticorrosionly once stripped down, the epoxy coating that exposes guarantees for seam steel patch provides cleaning under also available scraper under this temperature.
2, infrared heating description of the process
Infrared heater is in the international petroleum industry, gather oil gives to improve on the crude oil pipeline safety anti-explosive heating basis and forms in ultralow temperature area, it is the radiation effect that changes the infrared heating wave band by the size of adjusting frequency, visible light is become infrared rays makes its operating temperature low, produce heat energy effect height, thereby reach the engineering safety index request.This product is the heating equipment that adopts special material to make.Electric heating wire is by heating the metalloid object that coats during work, and thermal source is by the outside radiation of wave ray in such metallic cover material production, its wavelength is about about 1.6-4um, little and the thermal efficiency height of the thermal inertia that its when work produces, can carry out diathermanous fast to the low-density macromolecular material of height, increase heating quality to reach, shorten heating time, save heating energy source, the quickening body surface disposal time provides strong assurance.
Claims (4)
1, a kind of maintenance construction method for anti-corrosion metal pipeline is characterized in that, may further comprise the steps:
A, fed sheet of a media in the pipeline is reduced pressure, breakage spot is carried out shutoff;
B, breakage spot is coated the Far-infrared Heating cover, and, heat according to anticorrosive coat material adjustment heating frequency;
C, pull down the Far-infrared Heating cover, cut anticorrosion top layer and peel off;
D, breakage spot is welded repaired mouth;
E, welding detect qualified after, carry out preservative treatment.
2, a kind of maintenance construction method for anti-corrosion metal pipeline according to claim 1 is characterized in that, in the described steps A breakage spot is carried out shutoff, adopts the method for using Zhuan Yong Mu Xi.
3, a kind of maintenance construction method for anti-corrosion metal pipeline according to claim 1, it is characterized in that, among the described step B, the pipeline heating-up temperature of PE anti-corrosion material is 170-180 degree centigrade, and the pipeline heating-up temperature of epoxy coal anti-corrosion material is adjusted to 130-140 degree centigrade.
4, a kind of maintenance construction method for anti-corrosion metal pipeline according to claim 1, it is characterized in that, described step D is specially: the steel pipe skin patch that will get ready in advance is fixed on the body breakage spot, the weld bond periphery is with sticking with paste refractory mortar, with electric welding machine with the patch seam, check that the complete patch of seam does not have gas leak phenomenon, with wire brush and angle grinding machine with the processing such as derust of weld bond and surface.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2007101306353A CN101344207A (en) | 2007-07-11 | 2007-07-11 | Maintenance construction method for anti-corrosion metal pipeline |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2007101306353A CN101344207A (en) | 2007-07-11 | 2007-07-11 | Maintenance construction method for anti-corrosion metal pipeline |
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| CN101344207A true CN101344207A (en) | 2009-01-14 |
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| CNA2007101306353A Pending CN101344207A (en) | 2007-07-11 | 2007-07-11 | Maintenance construction method for anti-corrosion metal pipeline |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104251364A (en) * | 2013-06-28 | 2014-12-31 | 北京安科管道工程科技有限公司 | Pipeline repair stack and pipeline repair method |
| CN105351674A (en) * | 2015-11-10 | 2016-02-24 | 上海煤气第二管线工程有限公司 | Method for stopping leakage of valve or pipe irregularly deformed due to rusting |
| CN107583836A (en) * | 2017-09-25 | 2018-01-16 | 江苏固格澜栅防护设施有限公司 | A kind of fence anticorrosion process |
| CN108162503A (en) * | 2017-12-28 | 2018-06-15 | 北京市公用事业科学研究所 | Composite skins, containing its temperature adjustment fireguard, make plate method and application process |
| CN112483763A (en) * | 2020-11-19 | 2021-03-12 | 中国石油天然气集团有限公司 | Leaking stoppage method for corrosion leakage pipeline |
-
2007
- 2007-07-11 CN CNA2007101306353A patent/CN101344207A/en active Pending
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104251364A (en) * | 2013-06-28 | 2014-12-31 | 北京安科管道工程科技有限公司 | Pipeline repair stack and pipeline repair method |
| CN105351674A (en) * | 2015-11-10 | 2016-02-24 | 上海煤气第二管线工程有限公司 | Method for stopping leakage of valve or pipe irregularly deformed due to rusting |
| CN107583836A (en) * | 2017-09-25 | 2018-01-16 | 江苏固格澜栅防护设施有限公司 | A kind of fence anticorrosion process |
| CN108162503A (en) * | 2017-12-28 | 2018-06-15 | 北京市公用事业科学研究所 | Composite skins, containing its temperature adjustment fireguard, make plate method and application process |
| CN108162503B (en) * | 2017-12-28 | 2019-11-26 | 北京市公用事业科学研究所 | Composite skins, containing its temperature adjustment fireguard, make plate method and application method |
| CN112483763A (en) * | 2020-11-19 | 2021-03-12 | 中国石油天然气集团有限公司 | Leaking stoppage method for corrosion leakage pipeline |
| CN112483763B (en) * | 2020-11-19 | 2022-08-30 | 中国石油天然气集团有限公司 | Leaking stoppage method for corrosion leakage pipeline |
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