CN202674714U - Thermal insulating layer structure for radiographic inspection of high-temperature pipelines - Google Patents
Thermal insulating layer structure for radiographic inspection of high-temperature pipelines Download PDFInfo
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- CN202674714U CN202674714U CN2012202479233U CN201220247923U CN202674714U CN 202674714 U CN202674714 U CN 202674714U CN 2012202479233 U CN2012202479233 U CN 2012202479233U CN 201220247923 U CN201220247923 U CN 201220247923U CN 202674714 U CN202674714 U CN 202674714U
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Abstract
The utility model provides a nondestructive testing method and device for high-temperature and high-pressure metal pipes, and particularly relates to a thermal insulating layer structure for radiographic inspection of high-temperature pipelines, and a flexible thermal insulating layer (3) is added between a film (2) for high-temperature radiographic inspection and the pipe wall of a high-temperature pipeline (1). The thermal insulating layer structure is characterized in that the thermal insulating layer (3) comprises five layers, namely an inner protective layer (3a), an adhesive glue layer (3b), a heat insulation layer (3c), another adhesive glue layer (3d) and an outer protective layer (3e), which are sequentially arranged outwards from the position close to the pipe wall of the high-temperature pipeline (1), wherein the inner protective layer (3a) and the outer protective layer (3e) are both polyester fiber non-woven fabric pressed films; the heat insulation layer (3c) is a glass fiber felt lining; and the adhesive glue layer (3b) and the adhesive glue layer (3d) are both high-temperature resistant silica gel. By adopting the technical scheme, when the radiographic inspection method is adopted, cooling down the high-temperature pipeline in advance is not required, so that the cooling-down time is saved, and the working efficiency is improved. And as the special cooling-down procedure for inspection is omitted, energy is saved and great economical and social benefits are achieved.
Description
Technical field
The utility model system particularly relates to the insulating layer structure that a kind of high-temperature pipe workpiece adopts radiographic inspection to a kind of the cannot-harm-detection device of high temperature, high-pressure metal pipe.
Background technique
Along with progress and the industrial needs of science and technology, the bearing device of pipeline shape uses very extensive, and the tube wall quality requirement to pipeline shape bearing device in the use is very high, otherwise can affect production, even causes occurring security incident.
National Development and Reform Committee issued industry standard JB/T4730.2-2005 " bearing device non-destructive inspection " part 2 in 2005: radiographic inspection.To steel, nickel, copper bearing device melting butt welded joint radiographic inspection quality grading, the regulation suitable thicknesses is carbon steel, low alloy steel, Austenitic Stainless Steel, nickel and the nickel alloy bearing device processed of 2mm-400mm, and thickness is the copper of 2mm-400mm and the melting butt welded joint radiographic inspection quality grading of Cuprum alloy bearing device processed.
Defective in the butt welded joint can be divided into crackle, incomplete fusion, lack of penetration, bar defect and circular flaw totally five classes by character.Can be divided into I, II, III, IV level according to the defective in the butt welded joint by character, quantity and density degree, its credit rating.
Standard code, the detection of all these defectives all necessarily require the temperature of bearing device near normal temperature, just can obtain correct testing result.
Film need to be adjacent to tube wall during radiographic inspection, and the film of general radiographic inspection can only bear normal temperature, thereby when radiographic inspection, film can't be directly adjacent to the tube wall seam inspection.
Contain in addition the sensitive material bromide silver in the film, therefore can find out high temperature on the impact of ray negative quality mainly aspect two: one, the sheet base can not bear high temperature and deform; Its two, bromide silver particulate Yin Gaowen occur to decompose and to cause the Fog degree to increase.
General high-temperature pipe workpiece operating temperature is at 200 ℃～300 ℃, for this reason, must make unit slowly lower the temperature from high temperature in order to detect, from experience in the past, when being cooled to 80～100 ℃ from 200 ℃～300 ℃, generally palpus is 2～4 hours consuming time, in hot season in summer, consuming time longer, such-and-such mode detects, and not only wastes time, also allow the work of heating again after the equipment cooling, to expend in vain the energy, with the today of pursuing efficient energy-saving be contrary, related domain urgently wishes a kind of improvement way and respective material.
The model utility content
Even the purpose of this utility model provides the pipeline of bearing device under the condition of high temperature, still can carry out a kind of method and the corresponding material facility thereof of radiographic inspection, to reach fast detecting, do not shut down, do not lower the temperature, the purpose of energy saving.
The purpose of this utility model is achieved through the following technical solutions:
A kind of high-temperature pipe radiographic inspection insulating layer structure is characterized in that described thermal-protective coating is outside from the tube wall near high-temperature pipe, and successively five layers are: inner protective layer, adhesive glue water layer, heat resistant layer, adhesive glue water layer and outside protective layer;
Described inner protective layer is the non-woven fabric press mold of polyester fibre;
The adhesive glue water layer is high temperature resistant silica gel;
Heat resistant layer is glass fibre felt liner;
The adhesive glue water layer is high temperature resistant silica gel;
The outside protective layer is the non-woven fabric press mold of polyester fibre;
Described glass fibre felt liner composition:
| The material title | Chemical formula | Content [%] |
| The E-glass fibre | - | 90.0 |
| Polypropylene fiber | [CH2-CH（CH3）]n | 5.0 |
| PETG | [CO-C6H4-CO-O-C2H4-O]n | 5.0 |
Further, described adhesive glue water layer is Toshiba's 381 silica gel.
Further, the thickness of described heat resistant layer is less than 5mm.
Technical solutions of the utility model are used in following occasion:
A kind of high-temperature pipe ray detection method increases flexible thermal-protective coating between the tube wall that carries out the used film of high temperature radiographic inspection and high-temperature pipe, further, and fit respectively outside described thermal-protective coating is interior film and high-temperature pipe tube wall.
When carrying out the high temperature radiographic inspection, between the weld seam of film and high-temperature pipe workpiece, increase one deck thermal-protective coating, make interior film of exposure time remain on relatively low temperature.
From theory analysis, the condition that thermal-protective coating need satisfy: the pipeline radiographic inspection generally adopts the For Double-wall Single-image Radiographic Inspection mode, and in the situation that other conditions are fixed, film is less the closer to the egative film Geometric unsharpness of tested workpiece gained.
Owing to penetrating the source or the X-ray tube focus has certain size, so during transillumination pipeline workpiece, the image edge of defective in workpiece surface profile or the workpiece on egative film can produce the penumbra of certain width, and this penumbra width is exactly Geometric unsharpness Ug, and the available following formula of Ug value calculates: Ug=bdf/f
Wherein, establish the f-focus to the distance of workpiece surface
The b-workpiece surface is to the distance of film
Df-Focus size
By following formula as can be known, film gets over workpiece, and namely b is less, and then Ug is less, so the thermal-protective material of use need meet the following conditions:
Can be effectively heat insulation, make the film temperature within the exposure time that is attached to outside it be no more than 50 ℃, for the general industry film, in the situation that be not higher than 50 ℃, the Fog degree is subjected to temperature variation not obvious.
Thermal-protective coating thickness is enough thin, and the thickness of thermal-protective coating too conference causes the increase of Geometric unsharpness and the amplification of defect image.
Thermal-protective coating should be the little nonmetallic material of attenuation coefficient.
Thermal-protective coating should be flexible flexible material, is convenient to any crooked applying pipeline.
Domestic and international tens of kinds of heat-resistant materials have been collected, through repetition test relatively, made the thermal-protective coating that can satisfy above condition, this thermal-protective coating good heat-insulation effect, thin thickness, attenuation coefficient be little, can be crooked arbitrarily, through comparative trial and field practice, prove that this thermal-protective coating can reduce high temperature to the impact of film, very little on radiographic inspection indistinctenss and defect image impact again.The theory analysis thermal-protective coating is on the impact of image quality, with
The pipeline of 426mm * 12mm, weld reinforcement 2mm is that example is calculated thermal-protective coating to the impact of image quality:
Hence one can see that, and this thermal-protective coating thickness only is 5mm, all limited on the impact of imaging geometry indistinctenss and image amplification, can satisfy the requirement of standard.
The advantage of the utility model thermal-protective coating:
Can guarantee effectively that the egative film temperature is below 50 ℃ in the exposure time; By comparative trial, under same conditions of exposure and darkroom disposal condition, a. uses thermal-protective coating and does not use the thermal-protective coating photographic density to differ very small, illustrates that the attenuation coefficient of thermal-protective coating is very little; B. use the requirement of the equal JB/T4730-2005 standard of index such as egative film picture element index, blackness of thermal-protective coating; Use thermal-protective coating can reduce to a certain extent scattered ray to the impact of imaging sensitivity.
Adopt the technical program, when using ray detection method, needn't again high-temperature pipe be lowered the temperature in advance, saved the time of cooling, improved working efficiency.Simultaneously, cancelled as detecting special cooling process, also saved the energy, present technique has great economic and social benefit.In a word, the using scope of high-temperature pipe is increasingly extensive, and the high temperature ray detection method of corresponding employing technical solutions of the utility model and corresponding thermal-protective coating technology thereof also have fabulous application prospect.
Description of drawings
Fig. 1 is the utility model high-temperature pipe radiographic inspection insulating layer structure, and thermal-protective coating is configured in the structural representation between the used film of high temperature radiographic inspection and the high-temperature pipe tube wall, has also shown at the section perpendicular to conduit axis to take and imaging schematic diagram;
Fig. 2 is that Fig. 1 is parallel to the structural representation of conduit axis and takes imaging schematic diagram;
Fig. 3 is insulating layer structure schematic diagram of the present utility model.
Among the figure, 1 is that high-temperature pipe, 2 is that film, 3 is that thermal-protective coating, 3a are that inner face protective layer, 3b are that adhesive glue water layer, 3c are that heat resistant layer, 3d are that adhesive glue water layer, 3e are the outside protective layer.
Embodiment
Below in conjunction with drawings and Examples, the utility model is elaborated.
The occasion that the utility model high-temperature pipe radiographic inspection insulating layer structure uses: between the tube wall that carries out high temperature radiographic inspection used film 2 and high-temperature pipe 1, increase flexible thermal-protective coating 3.Described thermal-protective coating 3 interior outsides fit respectively film 2 and high-temperature pipe 1 tube wall.
A kind of high-temperature pipe radiographic inspection insulating layer structure, described thermal-protective coating 3 is outside from the tube wall near high-temperature pipe 1, and successively five layers are: inner protective layer 3a, adhesive glue water layer 3b, heat resistant layer 3c, adhesive glue water layer 3d and outside protective layer 3e;
Described inner protective layer 3a is the non-woven fabric press mold of polyester fibre; Surface grey material, effect are fire prevention, heat insulation, corrosion-resistant and waterproof;
Adhesive glue water layer 3b is high temperature resistant silica gel;
Heat resistant layer 3c is glass fibre felt liner; The inside white material, effect is heat-insulating flame-retardant, just decides thickness according to the thermal insulator temperature;
Adhesive glue water layer 3d is high temperature resistant silica gel; Effect is bonding bi-material.And non-stimulated without injury to human body.
Outside protective layer 3e is the non-woven fabric press mold of polyester fibre; Surface grey material, effect are fire prevention, heat insulation, corrosion-resistant and waterproof;
Described glass fibre felt liner composition:
| The material title | Chemical formula | Content [%] |
| The E-glass fibre | - | 90.0 |
| Polypropylene fiber | [CH2-CH（CH3）]n | 5.0 |
| PETG | [CO-C6H4-CO-O-C2H4-O]n | 5.0 |
Described adhesive glue water layer 3b, 3d are Toshiba's 381 silica gel, can meet the requirement of the technical program.
The thickness of described heat resistant layer 3c is selected according to the tube wall temperature of high-temperature pipe 1.
The thickness of described heat resistant layer 3c is less than 5mm,, can satisfy the requirement of examination criteria.
Practical engineering application
On September 16th, 2011, use this thermal-protective coating that Baosteel flat cold-rolled sheet factory steam conveying pipe has been carried out the high temperature radiographic inspection.260 ℃ of this pipeline operating temperatures are made film 270 altogether, all meet standard-required.
October 23, successfully utilize again this thermal-protective coating to finish the online detection of the high-temperature pipe of 180 ℃ of operating temperatures of Baosteel electric furnace.Make film altogether 144, all meet standard-required.
November 28, Baosteel silicon steel section, the online high temperature radiographic inspection of two steam lines of Baosteel overhaul of the equipments company have been successfully completed again.
High-temperature pipe is the larger special equipment of widely used danger, and the high-temperature pipe radiographic inspection can guarantee the safe operation of pipeline with the rules aspect on technological layer, can be the repair time of enterprise's saves valuable again, and market prospects are good.At present, company has utilized this thermal-protective coating to finish smoothly the detection of many high-temperature pipes such as Baosteel flat cold-rolled sheet factory, electric furnace, silicon steel section, and created more than 10 ten thousand yuan of output values for company this year.Believe along with further popularization, this thermal-protective coating technology can not only be brought huge facility for real work, and can for my company with market competition in be in the invincible position and increase counterweight, more the economic extra earning of company is done one's bit.
Present technique can extend to all related occasion of related domain, energy saving, increases work efficiency, and can produce larger society and economic benefit thus.
Claims (3)
1. high-temperature pipe radiographic inspection insulating layer structure, it is characterized in that described thermal-protective coating (3) is outside from the tube wall near high-temperature pipe (1), successively five layers are: inner protective layer (3a), adhesive glue water layer (3b), heat resistant layer (3c), adhesive glue water layer (3d) and outside protective layer (3e);
Described inner protective layer (3a) is the non-woven fabric press mold of polyester fibre;
Adhesive glue water layer (3b) is high temperature resistant silica gel;
Heat resistant layer (3c) is glass fibre felt liner;
Adhesive glue water layer (3d) is high temperature resistant silica gel;
Outside protective layer (3e) is the non-woven fabric press mold of polyester fibre.
2. described thermal-protective coating according to claim 1 is characterized in that described adhesive glue water layer (3b, 3d) is Toshiba's 381 silica gel.
3. described thermal-protective coating according to claim 1 is characterized in that the thickness of described heat resistant layer (3c) is less than 5mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012202479233U CN202674714U (en) | 2012-05-30 | 2012-05-30 | Thermal insulating layer structure for radiographic inspection of high-temperature pipelines |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012202479233U CN202674714U (en) | 2012-05-30 | 2012-05-30 | Thermal insulating layer structure for radiographic inspection of high-temperature pipelines |
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| CN202674714U true CN202674714U (en) | 2013-01-16 |
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| CN2012202479233U Expired - Lifetime CN202674714U (en) | 2012-05-30 | 2012-05-30 | Thermal insulating layer structure for radiographic inspection of high-temperature pipelines |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103558235A (en) * | 2013-10-28 | 2014-02-05 | 中国石油化工股份有限公司 | Radiographic inspection method with medium high-temperature pipeline |
| FR2997503A1 (en) * | 2012-10-25 | 2014-05-02 | Christophe Devaux | Method for carrying out radiography at high temperature at wall of e.g. tap, involves immobilizing radiographic film and insulating material layer, and exposing film to radiation by activating radiation source for limited duration |
| CN105490221A (en) * | 2015-12-13 | 2016-04-13 | 青岛智享专利技术开发有限公司 | Safety fireproof cooling wiring conduit |
-
2012
- 2012-05-30 CN CN2012202479233U patent/CN202674714U/en not_active Expired - Lifetime
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2997503A1 (en) * | 2012-10-25 | 2014-05-02 | Christophe Devaux | Method for carrying out radiography at high temperature at wall of e.g. tap, involves immobilizing radiographic film and insulating material layer, and exposing film to radiation by activating radiation source for limited duration |
| CN103558235A (en) * | 2013-10-28 | 2014-02-05 | 中国石油化工股份有限公司 | Radiographic inspection method with medium high-temperature pipeline |
| CN105490221A (en) * | 2015-12-13 | 2016-04-13 | 青岛智享专利技术开发有限公司 | Safety fireproof cooling wiring conduit |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CX01 | Expiry of patent term |
Granted publication date: 20130116 |
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| CX01 | Expiry of patent term |