CN103454291B - The thermofin that a kind of high-temperature pipe ray detection method is used - Google Patents
The thermofin that a kind of high-temperature pipe ray detection method is used Download PDFInfo
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- CN103454291B CN103454291B CN201210172179.XA CN201210172179A CN103454291B CN 103454291 B CN103454291 B CN 103454291B CN 201210172179 A CN201210172179 A CN 201210172179A CN 103454291 B CN103454291 B CN 103454291B
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Abstract
System of the present invention is to a kind of lossless detection method of high temperature, high-pressure metal pipe and device thereof, a kind of high-temperature pipe ray detection method, increases flexible thermofin (3) between the tube wall carrying out high temperature ray detection film used (2) and high-temperature pipe (1).The thermofin that a kind of high-temperature pipe ray detection method is used, it is characterized in that described thermofin (3) is outside from the tube wall near high-temperature pipe (1), successively five layers: inner protective layer (3a) is dacron non-thermoplastic cloth press mold; 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 seam (3e) is dacron non-thermoplastic cloth press mold; Adopting the technical program, need not again high-temperature pipe be lowered the temperature in advance when applying ray detection method, saved the time of cooling, improve work efficiency.Eliminating as detecting special cooling process, also saving the energy, have great economic and social benefit.
Description
Technical field
System of the present invention, to a kind of the cannot-harm-detection device of high temperature, high-pressure metal pipe, particularly relates to a kind of high-temperature pipe workpiece and adopts the method for ray detection and corresponding thermofin.
Background technology
Along with progress and the industrial needs of science and technology, the bearing device of pipeline shape uses very extensive, very high to the tube wall quality requirements of pipeline shape bearing device in using, otherwise can affect production, even causes occurring security incident.
National Development and Reform Committee has issued industry standard JB/T4730.2-2005 " bearing device Non-Destructive Testing " part 2 for 2005: ray detection.To steel, nickel, copper bearing device melting butt welded joint ray detection quality grading, regulation suitable thicknesses is carbon steel, low alloy steel, austenitic stainless steel, the Ni-based ultrafine powder bearing device of 2mm-400mm, and thickness is the melting butt welded joint ray detection quality grading of the Copper and its alloy bearing device of 2mm-400mm.
Defect in butt welded joint can be divided into crackle, incomplete fusion, lack of penetration, bar defect and circular flaw totally five classes by character.I, II, III, IV grade can be divided into by character, quantity and density level, its quality grade according to the defect in butt welded joint.
Standard specifies, the detection of all these defects all necessarily requires the temperature of bearing device close to normal temperature, just can obtain correct testing result.
Need film to be adjacent to duct wall during ray detection, and the film of general ray detection can only bear normal temperature, thus film cannot be directly adjacent to tube wall seam inspection when ray detection.
In addition in film containing photosensitive material silver bromide, therefore can find out high temperature to the impact of ray negative quality mainly in two: one, sheet base can not bear high temperature and deform; Its two, silver bromide particulate Yin Gaowen generations decomposition causes Fog degree to increase.
General high-temperature pipe workpiece working temperature is at 200 DEG C ~ 300 DEG C, for this reason, unit must be made slowly to lower the temperature from high temperature to detect, from experience in the past, when being cooled to 80 ~ 100 DEG C from 200 DEG C ~ 300 DEG C, 2 ~ 4 hours consuming time of general palpus, in hot season in summer, consuming time longer, such-and-such mode detects, and not only wastes time, also to heat again work after allowing equipment lower the temperature, to expend the energy in vain, be contrary with today of pursuit efficient energy-saving, a kind of improvement way and respective material are urgently wished in this area.
Summary of the invention
Even if the object of this invention is to provide the pipeline of bearing device at high operating temperatures, still can carry out a kind of method of ray detection and corresponding material facility thereof, to reach quick detection, not shut down, do not lower the temperature, the object of economize energy.
The object of the invention is to be achieved through the following technical solutions:
A kind of high-temperature pipe ray detection method, is characterized in that: carrying out increasing flexible thermofin between high temperature ray detection film used and the tube wall of high-temperature pipe.
Further, outside laminating film and high-temperature pipe tube wall respectively in described thermofin.
The thermofin that high-temperature pipe ray detection method is used, it is characterized in that described thermofin is outside from the tube wall near high-temperature pipe, successively five layers are: inner protective layer, adhesive glue water layer, heat resistant layer, adhesive glue water layer and outside protective seam;
Described inner protective layer is dacron non-thermoplastic cloth press mold;
Adhesive glue water layer is high temperature resistant silica gel;
Heat resistant layer is glass fibre felt liner;
Adhesive glue water layer is high temperature resistant silica gel;
Outside protective seam is dacron non-thermoplastic cloth press mold;
Described glass fibre felt liner composition:
Further, described adhesive glue water layer is Toshiba 381 silica gel.
Further, the thickness of described heat resistant layer is less than 5mm.
Technical solution of the present invention increases one deck thermofin when carrying out high temperature ray detection between film and the weld seam of high-temperature pipe workpiece, makes film in the time shutter remain on relatively low temperature.
From theoretical analysis, the condition that thermofin need meet: pipeline ray detection generally adopts For Double-wall Single-image Radiographic Inspection mode, when other conditions are fixed, film is less the closer to the egative film geometric unsharpness of examined workpiece gained.
Owing to penetrating source or X-ray tube focus has certain size, so during transillumination duct work, the image edge of defect on egative film in surface of the work profile or workpiece can produce the penumbra of one fixed width, and this penumbra width is exactly that the available following formula of geometric unsharpness Ug, Ug value calculates: Ug=bdf/f
Wherein, if f-focus is to the distance of surface of the work
B-surface of the work is to the distance of film
Df-focal spot size
From above formula, film gets over workpiece, and namely b is less, then Ug is less, so the heat-barrier material of use need meet the following conditions:
Can be effectively heat insulation, make to be attached to its outer film temperature within the time shutter and be no more than 50 DEG C, for general industry film, when not higher than 50 DEG C, Fog degree is not obvious by temperature variation.
Insulation thickness is enough thin, and the thickness of thermofin too conference causes the increase of geometric unsharpness and the amplification of defect image.
Thermofin should be the little nonmetallic materials of attenuation coefficient.
Thermofin should be flexible flexible material, is convenient to bending laminating pipeline arbitrarily.
Have collected domestic and international tens of kinds of heat proof materials, compare through repetition test, make the thermofin that can meet above condition, this thermofin good heat-insulation effect, thickness is thin, attenuation coefficient is little, can bend arbitrarily, through contrast test and field practice, prove that this thermofin can reduce the impact of high temperature on film, affect very little on ray detection indistinctness and defect image again.
Theoretical analysis thermofin on the impact of image quality, with
the pipeline of weld reinforcement 2mm is that example calculates thermofin to the impact of image quality:
It can thus be appreciated that this insulation thickness is only 5mm, all limited on the impact of imaging geometry indistinctness and Nonlinear magnify, the requirement of standard can be met.
The advantage of thermofin of the present invention:
Effectively can ensure that in the time shutter, egative film temperature is below 50 DEG C; By contrast test, under same conditions of exposure and darkroom disposal condition, a. uses thermofin and does not use thermofin photographic density to differ very small, illustrates that the attenuation coefficient of thermofin is very little; B. the requirement of the equal JB/T4730-2005 standard of index such as egative film picture element index, blackness of thermofin is used; Use thermofin can reduce the impact of scattered ray on image sensitivity to a certain extent.
Adopting the technical program, need not again high-temperature pipe be lowered the temperature in advance when applying ray detection method, saved the time of cooling, improve work efficiency.Meanwhile, eliminating as detecting special cooling process, also saving the energy, this technology has great economic and social benefit.In a word, the usable range of high-temperature pipe is increasingly extensive, and high temperature ray detection method and the corresponding thermofin technology thereof of corresponding employing technical solution of the present invention also have fabulous application prospect.
Accompanying drawing explanation
Fig. 1 is the cross-sectional schematics that high-temperature pipe ray detection method of the present invention is positioned at perpendicular to conduit axis;
Fig. 2 is the sectional schematic that Fig. 1 is parallel to conduit axis;
Fig. 3 is high-temperature pipe ray detection method of the present invention insulating layer structure schematic diagram used.
In figure, 1 is high-temperature pipe, 2 is that film, 3 is thermofin, 3a is inner face protective seam, 3b is adhesive glue water layer, 3c is heat resistant layer, 3d is adhesive glue water layer, 3e is outside protective seam.
Embodiment
Below in conjunction with drawings and Examples, the present invention is elaborated.
A kind of high-temperature pipe ray detection method: carrying out increasing flexible thermofin 3 between high temperature ray detection film used 2 and the tube wall of high-temperature pipe 1.
Outside laminating film 2 and high-temperature pipe 1 tube wall respectively in described thermofin 3.
The thermofin that high-temperature pipe ray detection method is used, described thermofin 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 seam 3e;
Described inner protective layer 3a is dacron non-thermoplastic cloth press mold; Surface grey material, effect is 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, decides thickness according to thermal insulator temperature height;
Adhesive glue water layer 3d is high temperature resistant silica gel; Effect is bonding bi-material.And to the non-stimulated fanout free region of human body.
Outside protective seam 3e is dacron non-thermoplastic cloth press mold; Surface grey material, effect is fire prevention, heat insulation, corrosion-resistant and waterproof;
Described glass fibre felt liner composition:
Described adhesive glue water layer 3b, 3d are Toshiba 381 silica gel, can meet the requirement of the technical program.
The thickness of described heat resistant layer 3c is selected according to the pipe surface temperature of high-temperature pipe 1.
The thickness of described heat resistant layer 3c is less than 5mm, the requirement of examination criteria can be met.
Practical engineering application
On September 16th, 2011, this thermofin is used to carry out high temperature ray detection to Baosteel flat cold-rolled sheet factory steam conveying pipe.This conduit operating temperature 260 DEG C, makes film 270 altogether, all meets standard-required.
October 23, this thermofin is successfully utilized again to complete the on-line checkingi of the high-temperature pipe of Baosteel electric furnace working temperature 180 DEG C.Make film 144 altogether, all meet standard-required.
November 28, for successfully completing again Baosteel silicon steel portion, the online high temperature ray detection of Baosteel overhaul of the equipments company two jet chimneys.
High-temperature pipe is the special equipment that widely used danger is larger, and high-temperature pipe ray detection can ensure the safe operation of pipeline on technological layer and in regulation aspect, and can save the valuable repair time for enterprise again, market outlook are had an optimistic view of.At present, company has utilized this thermofin to complete the detection of many high-temperature pipes such as Baosteel flat cold-rolled sheet factory, electric furnace, silicon steel portion smoothly, and this year is for company creates more than 10 ten thousand yuan of output values.Believe along with further popularization, this thermofin technology can not only bring huge facility for real work, and can for my company with market competition in be in invincible position and increase counterweight, more the economic extra earning of company is done one's bit.
This technology can extend to all related occasion of this area, economize energy, increases work efficiency, and can produce larger Social and economic benef@thus.
Claims (3)
1. the thermofin that high-temperature pipe ray detection method is used, increases flexible thermofin (3) between the tube wall carrying out high temperature ray detection film used (2) and high-temperature pipe (1);
Fit film (2) and high-temperature pipe (1) tube wall respectively in outside in described thermofin (3);
It is characterized in that:
Described thermofin (3) is outside from the tube wall near high-temperature pipe (1), and successively five layers are: inner protective layer (3a), the first adhesive glue water layer (3b), heat resistant layer (3c), the second adhesive glue water layer (3d) and outside protective seam (3e);
Described inner protective layer (3a) is dacron non-thermoplastic cloth press mold;
First adhesive glue water layer (3b) is high temperature resistant silica gel;
Heat resistant layer (3c) is glass fibre felt liner;
Second adhesive glue water layer (3d) is high temperature resistant silica gel;
Outside protective seam (3e) is dacron non-thermoplastic cloth press mold;
Described glass fibre felt liner composition: E-glass fibre is 90.0%, mekralon be 5.0% and polyethylene terephthalate be 5.0%; Wherein the chemical formula of mekralon is
the chemical formula of polyethylene terephthalate is
.
2. thermofin according to claim 1, is characterized in that described first adhesive glue water layer (3b) and the second adhesive glue water layer (3d) are Toshiba 381 silica gel.
3. thermofin according to claim 1, is characterized in that the thickness of described heat resistant layer (3c) is less than 5mm.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201210172179.XA CN103454291B (en) | 2012-05-30 | 2012-05-30 | The thermofin that a kind of high-temperature pipe ray detection method is used |
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| CN201210172179.XA CN103454291B (en) | 2012-05-30 | 2012-05-30 | The thermofin that a kind of high-temperature pipe ray detection method is used |
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| CN103454291B true CN103454291B (en) | 2015-07-29 |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN105588002A (en) * | 2014-10-22 | 2016-05-18 | 上海金艺检测技术有限公司 | Ray detection method used for in-use industrial steam pipeline without transmission interruption |
| CN112903725B (en) * | 2021-01-21 | 2022-10-28 | 刘建文 | Alpha-ray nondestructive testing device for high-temperature pipeline flaw detection |
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