CN201780451U - High-temperature resistance film for radiographic inspection of high-temperature pipeline - Google Patents
High-temperature resistance film for radiographic inspection of high-temperature pipeline Download PDFInfo
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- CN201780451U CN201780451U CN2010202032235U CN201020203223U CN201780451U CN 201780451 U CN201780451 U CN 201780451U CN 2010202032235 U CN2010202032235 U CN 2010202032235U CN 201020203223 U CN201020203223 U CN 201020203223U CN 201780451 U CN201780451 U CN 201780451U
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Abstract
The utility model relates to the radiographic inspection field, and particularly relates to a film for radiographic inspection of a high-temperature pipeline. The film for the radiographic inspection of the high-temperature pipeline includes a film for radiography, and further includes an asbestos-cloth liner layer combined on the contact surface of the film and the pipeline. The film for radiographic inspection can achieve the online inspection of high-temperature pipelines, has low cost and is suitable for heavy-workload inspection.
Description
Technical field
The utility model relates to the ray detection field, relates in particular to the film that a kind of high-temperature pipe ray detection is used.
Background technology
Pressure pipeline is a widely used visual plant in commercial production and the people's lives, also is a kind of specific installation that relatively is prone to accidents simultaneously.For guaranteeing the safe operation of pressure pipeline, country has formulated a series of rules, standard, and the authorised pressure pipeline must carry out periodic inspection.In recent years along with the enhancing of pressure pipeline safety monitor dynamics, to the periodic inspection work pay attention to day by day of industry and common-use tunnel.In periodic inspection, usually need pipeline welded joint is carried out Non-Destructive Testing.
In industry and common-use tunnel, the medium kind of pipeline is more, and wherein some is a jet chimney.These jet chimneys often owing to can't shut down, and difficultly carry out necessary Non-Destructive Testing in periodic inspection.
Available data is told us, and the temperature of depressing saturated vapour at 40 atmospheres is 250 ℃, and therefore generally, the working temperature of jet chimney is between 100～250 ℃.The lossless detection method that the defective routine is buried in the pipeline butt-weld has ultrasound examination, ray detection, but under 100～250 ℃ of working conditions, as carry out ultrasound examination, need to adopt high-temperature probe and high temperature ultrasound wave couplant, its cost is higher, easily scald the testing staff, so be not suitable for the detection of big workload; As adopting ray detection, the film temperature should not surpass 50 ℃ during common sensitivity of film, otherwise the emulsion layer adhesion will be come off, and causes detecting and loses efficacy.
Summary of the invention
The utility model is intended to address the above problem, and provides a kind of high-temperature pipe ray detection high temperature resistant film.Adopt the utility model can realize that high-temperature pipe is online and detect, cost is low, is fit to big workload and detects.
The utility model is achieved in that
The high temperature resistant film of a kind of high-temperature pipe ray detection, it comprises the radial imaging film, it also comprises the asbestos cloth laying that is compounded on film and the tube contacts face.
The high temperature resistant film of described high-temperature pipe ray detection is characterized in that, described asbestos cloth laying thickness is 5-10mm.
The utility model is by increasing the asbestos cloth liner on common film, with the heat of isolated high-temperature pipe transmission, thereby realize that cost is low to the online ray detection of carrying out of high-temperature pipe, both can guarantee the sensitivity of ray detection, enhance productivity, guaranteed again the safe operation of pipeline.
Description of drawings
The utility model is described in further detail below in conjunction with drawings and embodiments:
Fig. 1 is the utility model synoptic diagram.
Embodiment
As shown in Figure 1: the high temperature resistant film of a kind of high-temperature pipe ray detection, it comprises radial imaging film 1, and it also comprises the asbestos cloth laying 3 that is compounded on film 1 and pipeline 2 surface of contact, and 4 is radiographic source among the figure.
The high temperature resistant film of described high-temperature pipe ray detection, described asbestos cloth laying 3 thickness are 5-10mm.
Embodiment
(1) selects suitable thermal insulation material
Carry out pipeline high temperature ray detection, at first should select suitable material liners between pipe surface and film, guarantee not influence the performance of film.This material must possess that coefficient of heat conductivity is low, density is little and certain mechanical fastness is arranged, be easy to diastrophic characteristics.Through screening, we adopt a kind of ceramic fiber asbestos cloth.550 ℃ of this material limits working temperatures, coefficient of heat conductivity 0.04～0.05kcal/ (mh ℃), unit weight 42kg/m
3These performances all satisfy the requirement of high temperature ray detection:
A, the limit of working temperature are higher than the pipe surface temperature.
B, coefficient of heat conductivity are the per mille of carbon steel and are lower than like product.
C, density are little, and be very weak to the absorption of ray.
D, asbestos cloth be cracky not, flexible wrapping, thickness 5mm; But multilayer is superimposed to desired thickness.
(2) test of asbestos cloth liner thickness and heating-up time
In order to test different-thickness liner, different time to the suffered Temperature Influence of film, we carry out simulation test in the laboratory, result such as table 1:
Table 1 workpiece surface temperature is 280 ℃ test
Because the pipe surface temperature during actual detected is between 100～250 ℃, by above-mentioned test, consider that simultaneously the thickness of heat insulation layer will influence the quality of ray picture element, we determine to adopt 2 layers of asbestos cloth, time shutter during transillumination is not more than 70 seconds, the pad surfaces hand can touch with this understanding, and film is excellent.
(3) radiogenic selection
The material of jet chimney is generally the 20# steel pipe, and main specifications is Φ 219 * 8, Φ 325 * 10.The transillumination mode adopts double-walled list shadow mode, and transillumination thickness is 16～20mm.In order to shorten the sensitivity of film time, utilize the γ source advantage easily of focusing, select the gamma-ray machine of the Ir192 about 70Ci for use.
(4) liner thickness is to the impact analysis of picture element quality
Geometric condition from the sensitivity of film imaging, the asbestos cloth liner has increased the distance of film and pipe surface, to improve geometric unsharpness and inherent unsharpness, cause the decline of photographic quality, therefore need to analyze of the influence of asbestos cloth liner thickness the picture element quality.
The effect that A, liner amplify image
According to projection theory, radiographic X magnification M=1+L2/L1
In the formula: L1---the source of penetrating is to the surface of the work distance
L2---surface of the work is to the film distance
With Φ 325 * 10 pipe double-walled list shadow transilluminations is that example is calculated.
M1=1+10/320=1.03 during linerless; M2=1+20/320=1.06 when liner is arranged; M2/M1=1.06/1.03=1.03.The image amplification only increases by 3 percent than normal photograph after promptly adding 2 layers of asbestos cloth, can ignore.
B, liner are to the influence of geometric unsharpness
According to maximum geometric unsharpness computing formula Ug=db/f
In the formula: d---focal spot size 3mm, b---surface of the work are to the film distance, and f-focus is to the surface of the work distance.
Be that example is calculated as follows still with Φ 325 * 10 pipe double-walled list shadow transilluminations.
Ug1=3 * 10/320=0.09mm during linerless; Ug2=3 * 20/320=0.19mm when liner is arranged; Ug2/Ug1=0.19/0.09=2.1.As seen add that geometric unsharpness is original 2 times behind 2 layers of asbestos cloth, this also is the main cause that can not strengthen liner thickness again.(annotate: because the asbestos lining softness, during use, when egative film fitted tightly with it, its thickness can reduce, and geometric unsharpness also reduces to some extent.)
C, liner are to the influence of image quality indicator sensitivity
For the influence of analysis-by-synthesis asbestos lining to picture element, we have done the contrast test of image quality indicator sensitivity, and technological parameter is as follows:
Radiographic source---Ir192, source strength 70Ci, focus---3mm, workpiece material/specification---20#/Φ 325 * 10mm;
Transillumination mode---double-walled list shadow, f-320mm, time shutter---65Sec, a transillumination length---170mm, film trade mark specification---AgfaC7,240 * 80mm, sensitizing mode---Pb 0.1mm, prescription---AgfaD7 developer solution, development temperature time---20 ℃ of 5min, employing standard---JB/T4730.2-2005 develop.
Test findings sees Table 2.
Table 2 has liner and the contrast of linerless picture element
Conclusion (of pressure testing): when liner is 2 layers, little to sensitivity, the blackness influence of radiographic film.
Claims (2)
1. high temperature resistant film of high-temperature pipe ray detection, it comprises the radial imaging film, it is characterized in that: it also comprises the asbestos cloth laying that is compounded on film and the tube contacts face.
2. the high temperature resistant film of high-temperature pipe ray detection according to claim 1 is characterized in that, described asbestos cloth laying thickness is 5～10mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010202032235U CN201780451U (en) | 2010-05-24 | 2010-05-24 | High-temperature resistance film for radiographic inspection of high-temperature pipeline |
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| Application Number | Priority Date | Filing Date | Title |
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| CN2010202032235U CN201780451U (en) | 2010-05-24 | 2010-05-24 | High-temperature resistance film for radiographic inspection of high-temperature pipeline |
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| CN201780451U true CN201780451U (en) | 2011-03-30 |
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| CN2010202032235U Expired - Lifetime CN201780451U (en) | 2010-05-24 | 2010-05-24 | High-temperature resistance film for radiographic inspection of high-temperature pipeline |
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Cited By (4)
| 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 |
| CN103454291B (en) * | 2012-05-30 | 2015-07-29 | 上海宝冶工程技术有限公司 | The thermofin that a kind of high-temperature pipe ray detection method is used |
| 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 |
-
2010
- 2010-05-24 CN CN2010202032235U patent/CN201780451U/en not_active Expired - Lifetime
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103454291B (en) * | 2012-05-30 | 2015-07-29 | 上海宝冶工程技术有限公司 | The thermofin that a kind of high-temperature pipe ray detection method is used |
| 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 |
| 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 |
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Granted publication date: 20110330 |
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