CN105715910A - Method for controlling corrosion of pipeline under insulating layer - Google Patents
Method for controlling corrosion of pipeline under insulating layer Download PDFInfo
- Publication number
- CN105715910A CN105715910A CN201610255763.XA CN201610255763A CN105715910A CN 105715910 A CN105715910 A CN 105715910A CN 201610255763 A CN201610255763 A CN 201610255763A CN 105715910 A CN105715910 A CN 105715910A
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- Prior art keywords
- corrosion
- temperature
- resin
- wrapping tape
- coating
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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
- F16L58/00—Protection of pipes or pipe fittings against corrosion or incrustation
- F16L58/02—Protection of pipes or pipe fittings against corrosion or incrustation by means of internal or external coatings
-
- 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
- F16L58/00—Protection of pipes or pipe fittings against corrosion or incrustation
- F16L58/02—Protection of pipes or pipe fittings against corrosion or incrustation by means of internal or external coatings
- F16L58/16—Protection of pipes or pipe fittings against corrosion or incrustation by means of internal or external coatings the coating being in the form of a bandage
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- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Application Of Or Painting With Fluid Materials (AREA)
Abstract
The invention discloses a method for controlling corrosion of a pipeline under an insulating layer. The method comprises the following steps of: (1) coating the outer wall of a steel pipeline with high-temperature corrosion-resistant paint to form a corrosion-resistant coating; (2) preparing a wrapping tape from a super absorbent resin and wrapping the corrosion-resistant coating with the wrapping tape, wherein the overlapped part of the previous turn and the next turn accounts for 30-50% of the width of the resin wrapping tape when the resin wrapping tape wraps the corrosion-resistant coating; (3) spraying a high-temperature corrosion inhibitor to the resin wrapping tape till the resin wrapping tape absorbs the high-temperature corrosion inhibitor to be in a saturated state; (4) coating the resin wrapping tape absorbing the high-temperature corrosion inhibitor with a high-temperature-resistant thin film; and (5) arranging an insulating layer outside the high-temperature-resistant thin film, wherein an outer bushing is arranged outside the insulating layer. The resin wrapping tape absorbing the high-temperature corrosion inhibitor is coated with the high-temperature-resistant thin film, so that the high-temperature corrosion inhibitor is in a water environment condition all the way to persistently play a role of inhibiting corrosion to achieve the purpose of protecting the point-exposed parts on the surface of the steel pipeline. The method is simple in construction process and high in economical benefit, and has huge market promotional value.
Description
Technical field
The present invention relates to technical field of anticorrosion, pipeline process for corrosion control under specifically a kind of heat-insulation layer.
Background technology
Corrosion (CUI) under heat-insulation layer refers to a kind of corruption occurred on the pipeline being applied with heat-insulation layer material or device outer surface
Erosion phenomenon, the CUI on pipeline is mainly the corrosion of carbon steel material, shows as the corrosion thinning of pitting corrosion or material；Ordinary circumstance
Under, the corrosion rate of steel construction is relevant to the several factors such as temperature, humidity, and temperature is the highest, and corrosion rate is the fastest, but and this
Meanwhile, corrosion rate is directly proportional to the moisture in environment again, and in high temperature open environment, the rising of temperature can cause week
The reduction of moisture in collarette border, it is thus possible to slow down corrosion rate；But CUI important feature is exactly, additional
Heat-insulation layer can cause a hot and humid closed environment, thus causes the aggravation of corrosion.
The key factor that CUI occurs is the existence of steam, and the steam under heat-insulation layer is essentially from two aspects: first, extraneous
Steam infiltration, insulation material is usually loose porous structure, has bigger specific surface area, thus has stronger suction
Outlet capacity, owing to the external world's protection design defect of material, installation is poor, mechanical damage, is negligent of the reasons such as maintenance, all can
Steam is made to enter heat-insulation layer；Second, condensation, when metallic surface temperature is less than ambient dew point temperature, the steam of infiltration
Metal surface can be condensed in；Additionally, heat-insulation layer material also plays vital effect, heat-insulation layer institute to the generation of CUI
Material be inorganic matter mostly, wherein contain substantial amounts of inorganic salt, such as chloride, fluoride, sulfide etc., can make
Becoming corrosion of steel structure, these corrosion impurity and insulation material form the strongest electrolyte solution, and once these solution set with metal
For coming in contact, so that it may cause strong corrosion reaction；For petrochemical industry, the corrosion under heat-insulation layer also has it special
Property relates to a lot of different process due to petrochemical industry, and therefore the steel construction under heat-insulation layer often will also be subjected to thermal cycle
Process, and for conventional high-temperature coating, owing to thermal coefficient of expansion is different from iron and steel, experience thermal cycle frequently can lead to
The increase of coating internal stress, ultimately causes the initial failure of coating.
Present stage, solve corrosion under insulation and can be generally divided into both direction: one is the protection strengthening heat-insulation layer,
The hot and humid environment stopping dampness entrance and cause, selects including trying not and easily absorbs moisture and easily cause corrosive substance
The insulation material being detained, particularly those have hollow-core construction feature and a bibulous insulation material, and water content to be selected
Little, the insulation material of fast drying.Two is coating anticorrosive paint, i.e. coats one layer at equipment outer wall (below heat-insulation layer) and has
The coating that good adhesion, mechanical performance and Corrosion Protection are excellent, under heat-insulation layer, the environment residing for pipeline determines it to anti-
The particular/special requirement of rotten coating, should ensure that coating can keep stable in high temperature environments, simultaneously again can be at the environment of low temperature and high relative humidity
Under to steel construction provide anti-corrosion protection.
It practice, do not have any heat-insulation layer to be completely cut off by moisture completely, and design defect, installation are poor, machine
Tool damage, it is negligent of the factors such as maintenance and all easily causes the entrance of moisture.So, center of gravity is more placed on anticorrosion and is coated with by people
In the research of material；Under heat-insulation layer, typical anticorrosive paint includes: epoxy novolac high-temperature resistant coating, inorganic zinc silicate anti-corrosive coating,
Thermal jet aluminium powder high-temperature resistant coating, organosilicon aluminium powder high-temperature resistant coating and organosilicon or silicone paint, epoxy novolac high-temperature resistant coating
Can construct with thick film, and there is the corrosion resistance of excellence, but coating layer thickness control and spraying coating process be required relatively strict, in heat
Under circulation and thermal shock, resistance is poor, and high-temperature resistant is about 200 DEG C, thus limits its application at a higher temperature；Nothing
Metallic zinc may be with ferrum generation electrochemistry polarity inversion under the conditions of 60～120 DEG C for machine zinc silicate anti-corrosive paint, and zinc powder is tied for steel
Structure becomes negative electrode；Meanwhile, zinc is anti-rapid in 50～150 DEG C of water, can not provide carbon steel enough in closing wet environment
Anti-corrosion protection, be prohibited from using in hot environment；Hot jet coating can effectively prevent carbon steel under heat-insulation layer
Corrosion, its performance is superior than traditional organic coating, protects the life-span up to 20～30a, the high-temperature resistant of hot jet coating up to
595 DEG C, but owing to surface process is required high by hot jet technique, rust cleaning should reach Sa3 level and be strict with, rough surface
Degree need to reach more than 75 μm, the most high to site operation and environmental requirement, several according to current construction equipment and management level
It is extremely difficult to requirement；And owing to spraying rear surface roughness is very big, overall cost is the highest, thus the high degree upper limit
Make it to use；Although organosilicon aluminium powder high-temperature resistant coating has the resistance to elevated temperatures of excellence, but due to thickness of once constructing
The lowest, cause construction number of channels too much, and when total film thickness is higher, film easily causes cracking phenomena, and once stops work
Maintenance, temperature reduces, and coating entirety antiseptic property is limited, also limit its large-scale application；Organosilicon or silicone paint lead to
Often it is resistant to the high temperature of up to more than 600 DEG C, but, they lack adhesive force and the basic obdurability that other coating have；For
Improve these key propertys, be usually added into acrylic acid or alkyd resin is modified, but, these resins can be at 200 DEG C
More than decompose, form a large amount of hole, structure is formed defect, thus affects its antiseptic property, it addition, organosilicon is high
Thermo-paint product solid content is the lowest, thus build is the lowest so that film is completely covered the roughness formed because of surface process
Relatively difficult, thus cause be greatly reduced its service life；Generally speaking, now under heat-insulation layer the protection of corrosive pipeline all with
Coating protection is main, but, due to the complexity of corrosive environment so that the performance of coating self, the difficult journey of construction technology
The incompatibility of each side factors such as the input amount on degree and price economy exposes the limitation of this kind of anti-corrosion method；Cause
This, need to set up a kind of more economically, effective anticorrosion mode is to the corrosive pipeline problem solving under heat-insulation layer.
Summary of the invention
It is an object of the invention to provide that a kind of construction technology is simple, economy is high, pipeline is rotten under the heat-insulation layer of favorable anti-corrosion effect
Erosion control method, with the problem solving to propose in above-mentioned background technology.
For achieving the above object, the present invention provides following technical scheme:
Pipeline process for corrosion control under a kind of heat-insulation layer, comprises the following steps:
1) coat one layer of high-temperature anticorrosion paint at steel pipe outer wall and form corrosion-inhibiting coating；
2) High hydrophilous resin is made Resin Wound band be wound around outside corrosion-inhibiting coating；
3) high-temperature corrosion inhibitor is sprayed on Resin Wound band, absorbs high-temperature corrosion inhibitor to Resin Wound band and reach saturation；
4) the Resin Wound band of high-temperature corrosion inhibitor is had with high-temperature resistant membrane cladding absorption；
5) heat-insulation layer is set outside high-temperature resistant membrane, trocar sheath is set outside heat-insulation layer.
As the further scheme of the present invention: in described step 2, during the winding of Resin Wound band, a upper circle encloses lap with next
30%-50% for Resin Wound band bandwidth.
Compared with prior art, the invention has the beneficial effects as follows: the present invention is adsorbed with high temperature by setting outside corrosion-inhibiting coating and delays
The Resin Wound band of erosion agent, then at Resin Wound band outer cladding high-temperature resistant membrane, fully lock water so that high-temperature corrosion inhibitor is always
It is under water environment conditions, persistently plays corrosion inhibition, thus reach steel pipe surface dew point position is carried out anticorrosion inhibition
Purpose, construction technology of the present invention is simple, economy is high, favorable anti-corrosion effect, has great market popularization value.
Accompanying drawing explanation
Fig. 1 is the structural representation of the present invention.
Wherein, 1-steel pipe；2-corrosion-inhibiting coating；3-Resin Wound band；4-high-temperature resistant membrane；5-heat-insulation layer；6-overcoat
Pipe.
Detailed description of the invention
Below in conjunction with the accompanying drawing in the embodiment of the present invention, the technical scheme in the embodiment of the present invention is carried out clearly and completely
Describe, it is clear that described embodiment is only a part of embodiment of the present invention rather than whole embodiments.Based on this
Embodiment in invention, the every other reality that those of ordinary skill in the art are obtained under not making creative work premise
Execute example, broadly fall into the scope of protection of the invention.
Refer to Fig. 1, in the embodiment of the present invention, pipeline process for corrosion control under a kind of heat-insulation layer, comprise the following steps:
1) coat one layer of high-temperature anticorrosion paint at steel pipe 1 outer wall and form corrosion-inhibiting coating 2；
2) High hydrophilous resin is made Resin Wound band 3, and to be wrapped in corrosion-inhibiting coating 2 outside, when Resin Wound band 3 is wound around on
One circle and the 30%-50% that next circle lap is Resin Wound band 3 bandwidth；
3) high-temperature corrosion inhibitor is sprayed on Resin Wound band 3, absorbs high-temperature corrosion inhibitor to Resin Wound band 3 and reach saturated
State；
4) the Resin Wound band 3 of high-temperature corrosion inhibitor is had with high-temperature resistant membrane 4 cladding absorption；
5) heat-insulation layer 5 is set outside high-temperature resistant membrane 4, trocar sheath 6 is set outside heat-insulation layer 5.
The design principle of the present invention is: the water absorption of super absorbent resin is high, can reach more than thousand times of deadweight, and water conservation
Property strong, even if being not easy to dehydration being heated, under pressurized conditions, to light, heat, the good stability of soda acid, having and absorbing water-release
The absorbent function repeatedly of water-be dried-absorb water again；At high operating temperatures, High hydrophilous resin is wound around and can evaporate with the moisture in 3,
But, the steam of evaporation condenses into water after running into high-temperature resistant membrane 4, condense water and be wound around band 3 absorption by High hydrophilous resin rapidly,
High-temperature corrosion inhibitor is constantly under water environment conditions, and corrosion inhibiter plays corrosion inhibition, the dew point to steel pipe 1 surface
Position is protected, thus significantly slow down the surface corrosion of steel pipe 1.
It is obvious to a person skilled in the art that the invention is not restricted to the details of above-mentioned one exemplary embodiment, and do not carrying on the back
In the case of the spirit or essential attributes of the present invention, it is possible to realize the present invention in other specific forms.Therefore, no matter from
From the point of view of which point, all should regard embodiment as exemplary, and be nonrestrictive, the scope of the present invention is by appended power
Profit requires rather than described above limits, it is intended that all by fall in the implication of equivalency and scope of claim
Change is included in the present invention.Should not be considered as limiting involved claim by any reference in claim.
Although moreover, it will be appreciated that this specification is been described by according to embodiment, but the most each embodiment only comprises
One independent technical scheme, this narrating mode of description is only the most for clarity sake, and those skilled in the art should be by
Description is as an entirety, and the technical scheme in each embodiment can also be through appropriately combined, and forming those skilled in the art can
With other embodiments understood.
Claims (2)
1. pipeline process for corrosion control under a heat-insulation layer, it is characterised in that: comprise the following steps:
1) coat one layer of high-temperature anticorrosion paint at steel pipe (1) outer wall and form corrosion-inhibiting coating (2)；
2) High hydrophilous resin is made Resin Wound band (3) and is wrapped in corrosion-inhibiting coating (2) outside；
3) high-temperature corrosion inhibitor is sprayed on Resin Wound band (3), absorbs high-temperature corrosion inhibitor to Resin Wound band (3) and reach
To saturation；
4) the Resin Wound band (3) of high-temperature corrosion inhibitor is had with high-temperature resistant membrane (4) cladding absorption；
5) heat-insulation layer (5) is set in high-temperature resistant membrane (4) outside, trocar sheath (6) is set outside heat-insulation layer (5).
Pipeline process for corrosion control under heat-insulation layer the most according to claim 1, it is characterised in that in described step 2,
Resin Wound band (3) is a upper circle and the 30%-50% that next circle lap is Resin Wound band (3) bandwidth when being wound around.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610255763.XA CN105715910A (en) | 2016-04-21 | 2016-04-21 | Method for controlling corrosion of pipeline under insulating layer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610255763.XA CN105715910A (en) | 2016-04-21 | 2016-04-21 | Method for controlling corrosion of pipeline under insulating layer |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN105715910A true CN105715910A (en) | 2016-06-29 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201610255763.XA Pending CN105715910A (en) | 2016-04-21 | 2016-04-21 | Method for controlling corrosion of pipeline under insulating layer |
Country Status (1)
| Country | Link |
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| CN (1) | CN105715910A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107029963A (en) * | 2017-05-17 | 2017-08-11 | 中核核电运行管理有限公司 | A kind of pipeline outer wall coating care device |
| JP2021017966A (en) * | 2019-07-23 | 2021-02-15 | 信越ポリマー株式会社 | Nut looseness prevention structure and method for forming the same |
| CN113551103A (en) * | 2021-06-30 | 2021-10-26 | 上海宝冶集团有限公司 | Method for fixing super heat-insulating material of water beam of heating furnace |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2027158B (en) * | 1978-07-07 | 1982-10-13 | Clarkson J N | Protected and insulated pipeline |
| JPH112385A (en) * | 1997-06-09 | 1999-01-06 | Nitto Denko Corp | Sound proofing, anticorrosive, and antisweating structure for gas piping |
| CN102336876A (en) * | 2011-08-02 | 2012-02-01 | 西南石油大学 | Preparation method of controlled-degradation high-hygroscopicity resin |
| CN102705633A (en) * | 2012-05-31 | 2012-10-03 | 山东胜利钢管有限公司 | High shearing force three-layered polyolefin anti-corrosive thermal insulation steel pipe and manufacturing process thereof |
| CN202986248U (en) * | 2012-06-27 | 2013-06-12 | 沈阳防锈包装材料有限责任公司 | Protective and antirust packaging material for condensation-preventing steel coil |
-
2016
- 2016-04-21 CN CN201610255763.XA patent/CN105715910A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2027158B (en) * | 1978-07-07 | 1982-10-13 | Clarkson J N | Protected and insulated pipeline |
| JPH112385A (en) * | 1997-06-09 | 1999-01-06 | Nitto Denko Corp | Sound proofing, anticorrosive, and antisweating structure for gas piping |
| CN102336876A (en) * | 2011-08-02 | 2012-02-01 | 西南石油大学 | Preparation method of controlled-degradation high-hygroscopicity resin |
| CN102705633A (en) * | 2012-05-31 | 2012-10-03 | 山东胜利钢管有限公司 | High shearing force three-layered polyolefin anti-corrosive thermal insulation steel pipe and manufacturing process thereof |
| CN202986248U (en) * | 2012-06-27 | 2013-06-12 | 沈阳防锈包装材料有限责任公司 | Protective and antirust packaging material for condensation-preventing steel coil |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107029963A (en) * | 2017-05-17 | 2017-08-11 | 中核核电运行管理有限公司 | A kind of pipeline outer wall coating care device |
| CN107029963B (en) * | 2017-05-17 | 2023-07-14 | 中核核电运行管理有限公司 | Pipeline outer wall coating maintenance device |
| JP2021017966A (en) * | 2019-07-23 | 2021-02-15 | 信越ポリマー株式会社 | Nut looseness prevention structure and method for forming the same |
| CN113551103A (en) * | 2021-06-30 | 2021-10-26 | 上海宝冶集团有限公司 | Method for fixing super heat-insulating material of water beam of heating furnace |
| CN113551103B (en) * | 2021-06-30 | 2022-09-16 | 上海宝冶集团有限公司 | Method for fixing super heat-insulating material of water beam of heating furnace |
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Application publication date: 20160629 |
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