CN104897701A - Radiographic testing method for local thinning of valve body - Google Patents
Radiographic testing method for local thinning of valve body Download PDFInfo
- Publication number
- CN104897701A CN104897701A CN201510342688.6A CN201510342688A CN104897701A CN 104897701 A CN104897701 A CN 104897701A CN 201510342688 A CN201510342688 A CN 201510342688A CN 104897701 A CN104897701 A CN 104897701A
- Authority
- CN
- China
- Prior art keywords
- valve
- valve body
- region
- egative film
- thinning
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Landscapes
- Analysing Materials By The Use Of Radiation (AREA)
Abstract
The invention provides a radiographic testing method for local thinning of a valve body. The method comprises steps as follows: 1), sensitive parts for valve body thinning are visually judged according to site situations as well as the type and the structure of a valve, and comprise a valve body bottom area, a valve body side surface area and a connecting pipe weld joint area; 2), the areas of the sensitive parts judged in the step 1) are subjected to radiographing in a transilluminated manner, and the specific process comprises steps as follows: negative films for radiographing are placed in the three areas of the sensitive parts respectively, and the areas are completely covered with the negative films; 3), a scanner is utilized to scan the negative films on site, and digital photos are acquired and subjected to digital image grayscale contrast by a computer, so that existing thinning areas and the thinning degree are judged. The radiographic testing method for local thinning of the valve body has the advantages of high applicability, high accuracy degree, high efficiency and the like.
Description
Technical field
The present invention relates to valve ageing management field, particularly relate to a kind of ray detection method of valve local reduction.
Background technology
Valve, in operational process, due to washing away and effect of mass transmitting of larger turbulent flow, likely produces erosion or flowing accelerated corrosion at the sensitive part of valve body structure complexity, local reduction occurs.Since the eighties in 20th century, nuclear power plant constantly has more serious valve body thinning phenomenon to be found, as the 16 inches of stop valve body erosions of nuclear power plant of the U.S. and nuclear power plant of Korea S 16 inches of main feed water isolating valve valve body flowing accelerated corrosions etc., all affect the safe operation of nuclear power plant.Valve body, once leak because local reduction's inefficacy causes or break, will cause high-temperature high-pressure medium to leak, not only affect unit operation also entail dangers to equipment and personal safety.Therefore, the nuclear safety management organization of a lot of country, the nuclear safety mechanism (KINS) as U.S.'s core pipe meeting (NRC) and Korea S all requires that operating organization is set up wall thickness management outline and included in management system by valve body wall thickness.
At present, the maintenance of valve that nuclear power plant carries out, test, inspection work, mainly through Disintegration overhaul, check for valve function and availability, as seal spool inspection, packing replacing, valve driving machine structure check, and control system inspection etc.There is no valve local reduction is carried out effectively, the supervision and check of system and management work, also not inspection method and technique targetedly.
Simultaneously, the general pipe fitting of valve structural rate is more complicated, the reason of local reduction, position and the regularity of distribution have certain complicacy, general ultrasonic echo reflection thickness measuring method is difficult to carry out Accurate Determining to the thinning situation in valve body wall thickness drawn game portion, thus more need to develop special valve body wall thickness monitoring and the Examined effect of local reduction, with realistic monitoring requirements.
Summary of the invention
The shortcoming of prior art in view of the above, the object of the present invention is to provide a kind of ray detection method of valve local reduction, needs dissection test for solving valve detection in prior art, can not the problem of Site Detection.
For achieving the above object and other relevant objects, the invention provides a kind of ray detection method of valve local reduction, it comprises the following steps:
1) according to field condition and valve kind and structure, the sensitive part that intuitive judgment valve body is thinning, sensitive part comprises body base region, valve body lateral side regions and nozzle weld region;
2) utilize arrangement to step 1) described in each region in sensitive part carry out ray and take pictures, detailed process for: in three region that described sensitive part comprises, place the egative film of taking pictures respectively, and guarantee that each region is all covered completely by egative film;
3) use egative film described in scanner field scan and obtain digital photos, and using computing machine to carry out the intensity contrast of digital picture to the digital photos obtained, judging to there is which weakened region and thinning degree with this.
Preferably, described step 2) in when transillumination is carried out to described body base region, adopt the mode of slope transmit to take pictures, slope transmit refers to that radiographic source is from valve upper surface neck oblique illumination.
Preferably, described step 2) in when transillumination is carried out to described valve body lateral side regions, adopt the mode of vertical transmit to take pictures, vertical transmit refers to that radiographic source is from egative film opposite side vertical irradiation.
Preferably, described step 2) in when transillumination is carried out to described nozzle weld region, adopt the mode of vertical transmit to take pictures, vertical transmit refers to that radiographic source is from egative film opposite side vertical irradiation.
Preferably, described step 2) in when carrying out transillumination, radiogenic position and injection angle are as the criterion to cover whole described egative film, and select the suitable transillumination time according to valve body wall thickness.
As mentioned above, the ray detection method of valve local reduction of the present invention, there is following beneficial effect: all kinds of valve local reductions that the method can be used for nuclear power plant and Non-Nuclear Power Plant are detected and assessment, it adopts digital radial technology, according to field condition, valve material, type and specifications design ray detection technique, specifically comprise transillumination position, angle, time and egative film placement location, and mainly ray detection is carried out on the position being subject to fluid scouring and impact near body base downstream part and attachment weld etc., directly digital photos is obtained by scanning egative film, and directly use computing machine to carry out processing and analyzing, obtain valve body local reduction situation, it adopts ray to detect valve at the scene, and without the need to disintegrating, it has, and applicability is strong, accuracy is high, efficiency advantages of higher.
Accompanying drawing explanation
Fig. 1 is shown as the schematic diagram of the ray detection method medium dip transillumination of valve local reduction of the present invention.
Fig. 2 is shown as the left view of vertical transmit in the ray detection method of valve local reduction of the present invention.
Fig. 3 is shown as the vertical view of vertical transmit in the ray detection method utilizing valve local reduction of the present invention.
Element numbers explanation
1 valve body
2 radiographic sources
3 egative films
Embodiment
By particular specific embodiment, embodiments of the present invention are described below, person skilled in the art scholar the content disclosed by this instructions can understand other advantages of the present invention and effect easily.
Refer to Fig. 1 to Fig. 3.Notice, structure, ratio, size etc. that this instructions institute accompanying drawings illustrates, content all only in order to coordinate instructions to disclose, understand for person skilled in the art scholar and read, and be not used to limit the enforceable qualifications of the present invention, therefore the not technical essential meaning of tool, the adjustment of the modification of any structure, the change of proportionate relationship or size, do not affecting under effect that the present invention can produce and the object that can reach, all should still drop in scope that disclosed technology contents can contain.Simultaneously, quote in this instructions as " on ", D score, "left", "right", " centre " and " one " etc. term, also only for ease of understanding of describing, and be not used to limit the enforceable scope of the present invention, the change of its relativeness or adjustment, under changing technology contents without essence, when being also considered as the enforceable category of the present invention.
As shown in Figure 1 to Figure 3, the invention provides a kind of ray detection method of valve local reduction, it comprises the following steps:
1) according to field condition and valve kind and structure, the sensitive part that intuitive judgment valve body 1 is thinning, sensitive part comprises body base region, valve body lateral side regions and nozzle weld region;
2) utilize arrangement to step 1) described in each region in sensitive part carry out ray and take pictures, detailed process for: in three region that sensitive part comprises, place the egative film 3 of taking pictures respectively, and guarantee that each region is all covered completely by egative film 3; Wherein, when transillumination is carried out in body base region, as shown in Figure 1, adopt the mode of slope transmit to take pictures, slope transmit refers to that radiographic source 2 is from valve upper surface neck oblique illumination; When transillumination is carried out in valve body lateral side regions and nozzle weld region, adopt the mode of vertical transmit to take pictures, see shown in Fig. 2 and Fig. 3, vertical transmit refers to the opposite side vertical irradiation of radiographic source 2 from 3; When carrying out transillumination, the position of radiographic source 2 and injection angle are as the criterion to cover whole egative film, and select the suitable transillumination time according to the wall thickness of valve body 1;
3) use egative film described in scanner field scan and obtain digital photos, and using computing machine to carry out the intensity contrast of digital picture to the digital photos obtained, judging to there is which weakened region and thinning degree with this.
The present invention adopts digital radial technology, according to field condition, valve material, type and specifications design ray detection technique, ray detection technique comprises transillumination position, angle, time and egative film placement location, mainly ray detection is carried out on the position being subject to fluid scouring and impact near body base downstream part and attachment weld etc., directly digital photos is obtained by scanning egative film, and directly use computing machine to carry out processing and analyzing, obtain valve body local reduction situation.
In sum, the ray detection method of valve local reduction of the present invention, it adopts ray to detect valve at the scene, and without the need to disintegrating, it has, and applicability is strong, accuracy is high, efficiency advantages of higher.So the present invention effectively overcomes various shortcoming of the prior art and tool high industrial utilization.
Above-described embodiment is illustrative principle of the present invention and effect thereof only, but not for limiting the present invention.Any person skilled in the art scholar all without prejudice under spirit of the present invention and category, can modify above-described embodiment or changes.Therefore, such as have in art usually know the knowledgeable do not depart from complete under disclosed spirit and technological thought all equivalence modify or change, must be contained by claim of the present invention.
Claims (5)
1. a ray detection method for valve local reduction, is characterized in that, comprises the following steps:
According to field condition and valve kind and structure, the sensitive part that intuitive judgment valve body (1) is thinning, sensitive part comprises body base region, valve body lateral side regions and nozzle weld region;
1) utilize arrangement to step 1) described in each region in sensitive part carry out ray and take pictures, detailed process for: in three region that described sensitive part comprises, place the egative film (3) of taking pictures respectively, and guarantee that each region is all covered completely by egative film (3);
2) use egative film (3) described in scanner field scan and obtain digital photos, and using computing machine to carry out the intensity contrast of digital picture to the digital photos obtained, judging to there is which weakened region and thinning degree with this.
2. the ray detection method of valve local reduction according to claim 1, it is characterized in that: described step 2) in when transillumination is carried out to described body base region, adopt the mode of slope transmit to take pictures, slope transmit refers to that radiographic source (2) is from valve upper surface neck oblique illumination.
3. the ray detection method of valve local reduction according to claim 1, it is characterized in that: described step 2) in when transillumination is carried out to described valve body lateral side regions, adopt the mode of vertical transmit to take pictures, vertical transmit refers to the opposite side vertical irradiation of radiographic source (2) from egative film (3).
4. the ray detection method of valve local reduction according to claim 1, it is characterized in that: described step 2) in when transillumination is carried out to described nozzle weld region, adopt the mode of vertical transmit to take pictures, vertical transmit refers to the opposite side vertical irradiation of radiographic source (2) from egative film (3).
5. the ray detection method of valve local reduction according to claim 1, it is characterized in that: described step 2) in when carrying out transillumination, the position of radiographic source (2) and injection angle are as the criterion to cover whole described egative film (3), and select the suitable transillumination time according to valve body wall thickness.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510342688.6A CN104897701A (en) | 2015-06-19 | 2015-06-19 | Radiographic testing method for local thinning of valve body |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510342688.6A CN104897701A (en) | 2015-06-19 | 2015-06-19 | Radiographic testing method for local thinning of valve body |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN104897701A true CN104897701A (en) | 2015-09-09 |
Family
ID=54030500
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201510342688.6A Pending CN104897701A (en) | 2015-06-19 | 2015-06-19 | Radiographic testing method for local thinning of valve body |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN104897701A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114593871A (en) * | 2022-02-28 | 2022-06-07 | 陕西省天然气股份有限公司 | Pipeline valve internal leakage detection device and detection method based on digital rays |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5182775A (en) * | 1990-01-12 | 1993-01-26 | Kawasaki Jukogyo Kabushiki Kaisha | Method of processing radiographic image data for detecting a welding defect |
| JPH10253551A (en) * | 1997-03-12 | 1998-09-25 | Hitachi Ltd | Valve and its packing, inspection method of such a valve packing, and inspection apparatus for realizing the method |
| CN201697617U (en) * | 2009-11-09 | 2011-01-05 | 沈阳黎明航空发动机(集团)有限责任公司 | Thickness measurement device of conventional X-ray photographic vane |
| CN102059257A (en) * | 2010-11-04 | 2011-05-18 | 天津市核人仪器设备有限公司 | Device for online measuring wall thickness of hot-rolled metal pipe by using gamma rays |
| CN102519969A (en) * | 2011-11-30 | 2012-06-27 | 北京市丰台区特种设备检测所 | Method for completely checking pressure pipeline with heat preservation function without stopping running |
| CN103512906A (en) * | 2013-10-17 | 2014-01-15 | 航天海鹰(镇江)特种材料有限公司 | X-ray CR (computed radiography) detection method of aeronautical composite honeycomb structural component |
-
2015
- 2015-06-19 CN CN201510342688.6A patent/CN104897701A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5182775A (en) * | 1990-01-12 | 1993-01-26 | Kawasaki Jukogyo Kabushiki Kaisha | Method of processing radiographic image data for detecting a welding defect |
| JPH10253551A (en) * | 1997-03-12 | 1998-09-25 | Hitachi Ltd | Valve and its packing, inspection method of such a valve packing, and inspection apparatus for realizing the method |
| CN201697617U (en) * | 2009-11-09 | 2011-01-05 | 沈阳黎明航空发动机(集团)有限责任公司 | Thickness measurement device of conventional X-ray photographic vane |
| CN102059257A (en) * | 2010-11-04 | 2011-05-18 | 天津市核人仪器设备有限公司 | Device for online measuring wall thickness of hot-rolled metal pipe by using gamma rays |
| CN102519969A (en) * | 2011-11-30 | 2012-06-27 | 北京市丰台区特种设备检测所 | Method for completely checking pressure pipeline with heat preservation function without stopping running |
| CN103512906A (en) * | 2013-10-17 | 2014-01-15 | 航天海鹰(镇江)特种材料有限公司 | X-ray CR (computed radiography) detection method of aeronautical composite honeycomb structural component |
Non-Patent Citations (3)
| Title |
|---|
| K. STOEV等: "A Review of Digital Radiographytechnology For Valve Inspection", 《8TH INTERNATIONAL CONFERENCE ON CANDU MAINTENANCE》 * |
| RAMESH J. PATEL: "Digital Applications of Radiography", 《3RD MENDT》 * |
| 钟志民等: "核电厂二回路汽水管道壁厚管理实践与思考", 《中国核科学技术进展报告》 * |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114593871A (en) * | 2022-02-28 | 2022-06-07 | 陕西省天然气股份有限公司 | Pipeline valve internal leakage detection device and detection method based on digital rays |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN105158280B (en) | Prospect of Digital-Radiography accurately detects the defect of material and the method for thickness | |
| CN103157607B (en) | Article identification and sorting device and method thereof | |
| JP5894013B2 (en) | Deterioration management method for concrete surface | |
| CN102565081B (en) | Method for detecting pipeline defects based on three-dimensional data points acquired through circle structured light vision detection | |
| CN104463845B (en) | A kind of choosing method and system of flame forming plate feature registration point | |
| CN114778687A (en) | A method for rapid identification and evaluation of welding defects in pressure pipelines | |
| CN103775830A (en) | High-temperature stream leakage detection positioning system and high-temperature stream leakage detection positioning method | |
| Schoefs et al. | Quantitative evaluation of contactless impact echo for non-destructive assessment of void detection within tendon ducts | |
| CN205655808U (en) | Device of material thickness and defect height is measured with gasket and digital ray | |
| CN109115417B (en) | Pressure container air tightness detection method based on connected domain judgment | |
| CN205449833U (en) | Accurate detectable material's of digit ray transillumination technique defect and device of thickness | |
| CN110406818B (en) | Floating disc type storage tank system and method with storage tank floating disc type output capability | |
| CN105234573B (en) | Nuclear power station steam generator tube sheet and sealing weld seam damage rehabilitation method and system | |
| CN101839741A (en) | Liquid level height identification method | |
| CN104897701A (en) | Radiographic testing method for local thinning of valve body | |
| WO2014087494A1 (en) | Calculation system and calculation method | |
| CN101403712B (en) | Method for appraising X-ray detection weld joint K value by utilizing overlap joint mark article | |
| Hwang et al. | Location tracking of drifting container by solitary wave load using a motion analysis program | |
| CN112525923A (en) | Shared juice platform pipeline inner wall detection method and system and readable storage medium | |
| CN117537885A (en) | Oil level discriminating device and method | |
| Trampus | Ensuring safety of structures and components at nuclear power plants | |
| GB2531529A (en) | Method for assessing the condition of piping and vessels | |
| KR101393407B1 (en) | Development of early detecting system for swell- like high waves and tsunamis | |
| TWI759778B (en) | Fluid Monitoring System and Method | |
| CN102890293A (en) | Performance assessment method of X-ray security system based on resolution capability of material |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| RJ01 | Rejection of invention patent application after publication | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20150909 |