CN111397864A - Multifunctional test field for nuclear power plant buried pipe detection technology - Google Patents
Multifunctional test field for nuclear power plant buried pipe detection technology Download PDFInfo
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- CN111397864A CN111397864A CN201811609991.8A CN201811609991A CN111397864A CN 111397864 A CN111397864 A CN 111397864A CN 201811609991 A CN201811609991 A CN 201811609991A CN 111397864 A CN111397864 A CN 111397864A
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- 238000012360 testing method Methods 0.000 title claims abstract description 94
- 238000001514 detection method Methods 0.000 title claims abstract description 65
- 238000005516 engineering process Methods 0.000 title claims abstract description 22
- 238000000576 coating method Methods 0.000 claims abstract description 31
- 239000011248 coating agent Substances 0.000 claims abstract description 22
- 238000005260 corrosion Methods 0.000 claims description 9
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims description 8
- 229910000831 Steel Inorganic materials 0.000 claims description 8
- 229910052802 copper Inorganic materials 0.000 claims description 8
- 239000010949 copper Substances 0.000 claims description 8
- 239000010959 steel Substances 0.000 claims description 8
- 239000002689 soil Substances 0.000 claims description 3
- 238000004210 cathodic protection Methods 0.000 description 11
- 230000007547 defect Effects 0.000 description 4
- 230000032683 aging Effects 0.000 description 3
- 230000000694 effects Effects 0.000 description 2
- 239000004593 Epoxy Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000009933 burial Methods 0.000 description 1
- 239000004020 conductor Substances 0.000 description 1
- 239000004744 fabric Substances 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 239000002966 varnish Substances 0.000 description 1
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- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M13/00—Testing of machine parts
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N17/00—Investigating resistance of materials to the weather, to corrosion, or to light
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Abstract
The invention belongs to the technical field of detection of buried pipes in a nuclear power plant, and particularly relates to a multifunctional test field for a detection technology of the buried pipes in the nuclear power plant. The buried pipe A, the buried pipe B, the buried pipe C and the buried pipe D share two detection wells; an anticorrosive coating is prefabricated on each buried pipe, and four anticorrosive coating damage points are prefabricated on the anticorrosive coating; the current flows out from the constant potential rectifier, reaches the deep well anode through the cable, flows out from the deep well anode, flows into the buried pipe through the ground through the damaged point of the anticorrosive coating, then flows to the test pile through the cable between each buried pipe and the test pile, and finally flows back to the constant potential rectifier, and the adjustable resistor is connected in series on the cable between the test pile and the constant potential rectifier; four test pieces are respectively arranged near the buried pipe A, the buried pipe B, the buried pipe C and the buried pipe D, and each test piece is kept connected with the corresponding buried pipe through a test pile. The invention simulates the service condition of the buried pipe of the nuclear power plant, is used for the test research requirement of the buried pipe detection technology and improves the detection technical level of the buried pipe.
Description
Technical Field
The invention belongs to the technical field of detection of buried pipes in a nuclear power plant, and particularly relates to a multifunctional test field for a detection technology of the buried pipes in the nuclear power plant.
Background
Buried pipes are an important component of nuclear power plant process systems, which assume an important medium transport function. The normal operation of the unit can be influenced even the unit is stopped and the unit is stopped due to the failure and leakage of the buried pipe of the nuclear power plant. As the service time of the buried pipe increases, the buried pipe can be degraded to failure due to various aging. Since the buried pipe is buried underground, it is a technical problem to accurately detect the aging state of the buried pipe. The buried pipe detection technology has various technologies, including buried pipe ultrasonic guided wave detection, buried pipe anticorrosive coating detection and buried pipe cathode protection detection. In order to accurately evaluate the aging state of a buried pipe, detection needs to be carried out from multiple aspects, and each detection technology is influenced by different factors. Therefore, in order to provide the accuracy of the buried pipe detection technology, a multifunctional test field is needed to simulate the service conditions of the buried pipe of the nuclear power plant so as to establish the test conditions of the buried pipe detection technology and finally improve the technical level of the buried pipe detection.
Disclosure of Invention
The invention aims to provide a multifunctional comprehensive test field for a detection technology of a buried pipe in a nuclear power plant, which simulates the service condition of the buried pipe in the nuclear power plant, is used for the test research requirement of the detection technology of the buried pipe and improves the detection technical level of the buried pipe.
In order to achieve the purpose, the technical scheme adopted by the invention is as follows:
a multifunctional test field for a nuclear power plant buried pipe detection technology comprises a buried pipe A, a buried pipe B, a buried pipe C, a buried pipe D and a buried pipe E which are arranged in parallel, a detection well A, a detection well B, a test pile, an adjustable resistor, a constant potential rectifier, a deep well anode, a galvanized flat steel interference object and a copper stranded wire interference object; the detection well A and the detection well B are arranged at two ends of the buried pipe A, the buried pipe B, the buried pipe C and the buried pipe D, namely the buried pipe A, the buried pipe B, the buried pipe C and the buried pipe D share two detection wells; an anti-corrosion layer is prefabricated on each buried pipe, four anti-corrosion layer damage points are prefabricated on the anti-corrosion layer, and the anti-corrosion layer damage points are arranged on the buried pipes at equal intervals; the current flows out from the constant potential rectifier, reaches the deep well anode through the cable, flows out from the deep well anode, flows into the buried pipe through the ground through the damaged point of the anticorrosive coating, then flows to the test pile through the cable between each buried pipe and the test pile, and finally flows back to the constant potential rectifier, and the adjustable resistor is connected in series on the cable between the test pile and the constant potential rectifier; four test pieces are respectively arranged near the buried pipe A, the buried pipe B, the buried pipe C and the buried pipe D, and each test piece is kept connected with the corresponding buried pipe through a test pile; the three galvanized flat steel interferents are arranged at equal intervals along the buried pipe B, and the three copper stranded wire interferents are arranged at equal intervals along the buried pipe E.
The parameters of the buried pipe A, the buried pipe B, the buried pipe C, the buried pipe D and the buried pipe E are as follows:
the interval between the buried pipe A and the buried pipe B is 3m, the interval between the buried pipe B and the buried pipe C is 3m, the interval between the buried pipe C and the buried pipe D is 4.5m, and the interval between the buried pipe D and the buried pipe E is 9 m.
And the well depths of the detection well A and the detection well B are both 2 m.
The deep well anode is far away from the buried pipe and is arranged in the southeast direction of a test field, and the distance from the deep well anode to the buried pipe is 75 m.
The prefabricated area on the anticorrosive coating is 6.5cm2、20cm2、50cm2、100cm2The damage areas of the four anticorrosive coatings are increased progressively as the four anticorrosive coating damage points are closer to the deep well anode, and the distances between the four anticorrosive coating damage points and the end of the buried pipe far away from the deep well anode are respectively 2m, 8m, 14m and 22 m.
The areas of the four test pieces are respectively 6.5cm2、20cm2、50cm2、100cm2The test pieces are buried in the soil, and the distance between each test piece and the corresponding buried pipe is within 0.05 m.
The four test pieces of the buried pipe and the four damaged points of the anticorrosive coating are arranged at intervals in an inserting manner, and the area of the test piece is larger as the distance from the deep well anode is closer; along the direction of buried pipe, 6.5cm2Test piece, 20cm2Test piece, 50cm2Test piece, 100cm2The distances between the test piece and the ends of the buried pipe far away from the deep well anode are respectively 5m,11m,17m and 27 m.
The beneficial effects obtained by the invention are as follows:
the test field designs different buried pipe anticorrosive layer materials, different buried pipe burial depths, adjustable cathodic protection currents, anticorrosive layer defects of different sizes and multiple interferents, can truly simulate the detection conditions of the buried pipes in the nuclear power plant, and can also adjust and customize the detection test conditions of the buried pipes according to the test requirements. The test field can be used for realizing the ultrasonic guided wave detection test of the buried pipe, the detection test of the anticorrosive coating of the buried pipe, the detection test of the cathodic protection under the condition of variable current and the detection test of the influence of interferents on the cathodic protection effect, can research the influence of a plurality of detection factors on the detection result and improve the technical level of the field detection of the buried pipe.
Drawings
FIG. 1 is a schematic view of a multifunctional test field of a nuclear power plant buried pipe detection technology;
in the figure: 1. burying a pipe A; 2. burying a pipe B; 3. burying a pipe C; 4. burying a pipe D; 5. burying a pipe E; 6. detecting a well A; 7. a detection well B; 8. testing the pile; 9. an adjustable resistor; 10. a potentiostat; 11. deep well anodes; 12. galvanized flat steel interferents; 13. copper strand interferers.
Detailed Description
The invention is described in detail below with reference to the figures and specific embodiments.
As shown in figure 1, the multifunctional test field for the detection technology of the buried pipe in the nuclear power plant comprises a buried pipe A1, a buried pipe B2, a buried pipe C3, a buried pipe D4, a buried pipe E5, a detection well A6, a detection well B7, a test pile 8, an adjustable resistor 9, a potentiostat 10, a deep well anode 11, a galvanized flat steel interferent 12 and a copper stranded conductor interferent 13.
The buried pipes comprise 5 buried pipes which are arranged in parallel, and three buried depths of 0.5m, 1.0m and 1.5m are designed for the buried pipes so as to simulate the three most typical buried depths of the buried pipes in the nuclear power plant. A certain parallel spacing is maintained for 5 buried pipes, wherein the spacing between buried pipe a1 and buried pipe B2 is 3m, the spacing between buried pipe B2 and buried pipe C3 is 3m, the spacing between buried pipe C3 and buried pipe D4 is 4.5m, and the spacing between buried pipe D4 and buried pipe E5 is 9m, so as to simulate the typical parallel spacing of buried pipes in a nuclear power plant. An anticorrosive coating is prepared on each buried pipe, and four-oil three-cloth anticorrosive coatings, epoxy varnish and three-3 PE anticorrosive coatings are designed on the anticorrosive coatings so as to simulate several typical anticorrosive coatings of the buried pipes in the nuclear power plant. The buried depth, the pipeline specification and the anticorrosive coating of 5 buried pipes are designed as the following table 1:
TABLE 1 buried pipe specification and anticorrosive coating design
Anticorrosive coating defects with different sizes are prefabricated on each buried pipe so as to simulate the anticorrosive coating defects of the buried pipes in the nuclear power plant. The anticorrosive coating of each buried pipe is prefabricated with an area of 6.5cm2、20cm2、50cm2、100cm24 anticorrosive coatingsThe damaged points of the anticorrosive coatings are arranged on the buried pipe at equal intervals, the damaged area is increased progressively as the distance from the anode of the deep well is closer, and the defect distances of the four anticorrosive coatings to the pipe ends far away from the anode are respectively 2m, 8m, 14m and 22 m.
The cathode protection system is composed of a constant potential rectifier 10, a deep well anode 11, a test pile 8 and an adjustable resistor 9. The cathodic protection system provides cathodic protection current for a test field so as to simulate the cathodic protection current in a nuclear power plant and provide real detection conditions for a detection test. The constant potential rectifier 10 is the output end of the cathodic protection current, the current flows out from the constant potential rectifier 10 and reaches the deep well anode 11 through the cable, after flowing out from the deep well anode 11, the current flows into the buried pipes through the ground through the damage of the anti-corrosion layer, then flows into the test pile 8 through the cable between each buried pipe and the test pile 8, and finally flows back to the constant potential rectifier 10 to form a closed loop of the cathodic protection system. The adjustable resistor 9 is connected in series on a cable between the test pile 8 and the constant potential rectifier 10 to realize variable adjustment of cathodic protection current and simulate different protection effects of cathodic protection of a nuclear power plant. The deep well anode 11 is far away from the buried pipe and arranged in the southeast direction of a test field, and the distance from the deep well anode to the buried pipe is 75 m.
Two ends of the buried pipe A1, the buried pipe B2, the buried pipe C3 and the buried pipe D4 are respectively provided with a detection test well which is a detection well A6 and a detection well B7. The buried pipe A1, the buried pipe B2, the buried pipe C3 and the buried pipe D4 share two detection wells, the two detection wells are the same in size, and the well depth is 2 m. Buried pipe E5 is not provided with a test well.
The test pieces are arranged along the positions near four buried pipes, namely a buried pipe A1, a buried pipe B2, a buried pipe C3 and a buried pipe D4, four test pieces are respectively arranged near each pipeline, and the areas of the test pieces are respectively 6.5cm2、20cm2、50cm2、100cm2The test pieces are buried in the soil around the buried pipe, the distance between the test pieces and the buried pipe is within 0.05m, and each test piece is connected with the buried pipe through the test pile 8. The four test pieces of each buried pipe and the four damaged anticorrosive coatings are arranged at intervals, and the closer to the anode, the larger the area of the test piece. Along the direction of buried pipe, 6.5cm2Test piece, 20cm2Test piece, 50cm2A test piece,100cm2The distances between the test piece and the ends far away from the anode are respectively 5m,11m,17m and 27 m.
The interferents include galvanized flat steel interferents 12 and copper strand interferents 13 to simulate typical buried pipe cathodic protection interference currents of nuclear power plants. Three galvanized flat steel interferent 12 are designed in the test field, and are arranged at equal intervals along the buried pipe B2. Three copper stranded wire interferers 13 are designed in the test field and are arranged at equal intervals along the buried pipe E5.
Claims (8)
1. The utility model provides a nuclear power plant's buried pipe detection technique multifunctional test field which characterized in that: the device comprises a buried pipe A, a buried pipe B, a buried pipe C, a buried pipe D and a buried pipe E which are arranged in parallel, a detection well A, a detection well B, a test pile, an adjustable resistor, a constant potential instrument, a deep well anode, a galvanized flat steel interferent and a copper stranded wire interferent; the detection well A and the detection well B are arranged at two ends of the buried pipe A, the buried pipe B, the buried pipe C and the buried pipe D, namely the buried pipe A, the buried pipe B, the buried pipe C and the buried pipe D share two detection wells; an anti-corrosion layer is prefabricated on each buried pipe, four anti-corrosion layer damage points are prefabricated on the anti-corrosion layer, and the anti-corrosion layer damage points are arranged on the buried pipes at equal intervals; the current flows out from the constant potential rectifier, reaches the deep well anode through the cable, flows out from the deep well anode, flows into the buried pipe through the ground through the damaged point of the anticorrosive coating, then flows to the test pile through the cable between each buried pipe and the test pile, and finally flows back to the constant potential rectifier, and the adjustable resistor is connected in series on the cable between the test pile and the constant potential rectifier; four test pieces are respectively arranged near the buried pipe A, the buried pipe B, the buried pipe C and the buried pipe D, and each test piece is kept connected with the corresponding buried pipe through a test pile; the three galvanized flat steel interferents are arranged at equal intervals along the buried pipe B, and the three copper stranded wire interferents are arranged at equal intervals along the buried pipe E.
2. The multifunctional test field for the nuclear power plant buried pipe detection technology according to claim 1, is characterized in that: the parameters of the buried pipe A, the buried pipe B, the buried pipe C, the buried pipe D and the buried pipe E are as follows:
3. the multifunctional test field for the nuclear power plant buried pipe detection technology according to claim 2, is characterized in that: the interval between the buried pipe A and the buried pipe B is 3m, the interval between the buried pipe B and the buried pipe C is 3m, the interval between the buried pipe C and the buried pipe D is 4.5m, and the interval between the buried pipe D and the buried pipe E is 9 m.
4. The multifunctional test field for the nuclear power plant buried pipe detection technology according to claim 1, is characterized in that: and the well depths of the detection well A and the detection well B are both 2 m.
5. The multifunctional test field for the nuclear power plant buried pipe detection technology according to claim 1, is characterized in that: the deep well anode is far away from the buried pipe and is arranged in the southeast direction of a test field, and the distance from the deep well anode to the buried pipe is 75 m.
6. The multifunctional test field for the nuclear power plant buried pipe detection technology according to claim 1, is characterized in that: the prefabricated area on the anticorrosive coating is 6.5cm2、20cm2、50cm2、100cm2The damage areas of the four anticorrosive coatings are increased progressively as the four anticorrosive coating damage points are closer to the deep well anode, and the distances between the four anticorrosive coating damage points and the end of the buried pipe far away from the deep well anode are respectively 2m, 8m, 14m and 22 m.
7. The multifunctional test field for the nuclear power plant buried pipe detection technology according to claim 1, is characterized in that: the areas of the four test pieces are respectively 6.5cm2、20cm2、50cm2、100cm2The test pieces are buried in the soil, and the distance between each test piece and the corresponding buried pipe is within 0.05 m.
8. The multifunctional test field for the nuclear power plant buried pipe detection technology according to claim 7, is characterized in that: the four test pieces of the buried pipe and the four damaged points of the anticorrosive coating are arranged at intervals and are separated from the deep wellThe closer the sample is, the larger the area of the test piece is; along the direction of buried pipe, 6.5cm2Test piece, 20cm2Test piece, 50cm2Test piece, 100cm2The distances between the test piece and the ends of the buried pipe far away from the deep well anode are respectively 5m,11m,17m and 27 m.
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| CN201811609991.8A CN111397864A (en) | 2018-12-27 | 2018-12-27 | Multifunctional test field for nuclear power plant buried pipe detection technology |
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| CN201811609991.8A CN111397864A (en) | 2018-12-27 | 2018-12-27 | Multifunctional test field for nuclear power plant buried pipe detection technology |
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2018
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