CN104897856A - Sample pipe for verifying testing capability of erosion resistant layer detector, and verifying method - Google Patents
Sample pipe for verifying testing capability of erosion resistant layer detector, and verifying method Download PDFInfo
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- CN104897856A CN104897856A CN201510293552.0A CN201510293552A CN104897856A CN 104897856 A CN104897856 A CN 104897856A CN 201510293552 A CN201510293552 A CN 201510293552A CN 104897856 A CN104897856 A CN 104897856A
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Abstract
The invention discloses a sample pipe for verifying the testing capability of an erosion resistant layer detector, and a verifying method. A pipeline comprises a metal pipe and an erosion resistant layer, wherein the surface of the metal pipe is coated with the erosion resistant layer; a plurality of kinds of defect lines are distributed on the pipeline and comprise erosion resistant layer thinning, erosion resistant layer damage and erosion resistant layer stripping; the diameter of the pipeline is 500-1016mm, the length of the pipeline is more than or equal to 50m; a probe ring is arranged on the pipeline; the pipeline is externally connected with a circuit which is in a cathodic protection mode. The verifying method comprises the following steps: recording the defect lines on the sample pipe to form a database, burying the sample pipe underground, testing the sample pipe by adopting to-be-verified devices according to corresponding testing methods, and performing contrastive analysis between testing results and parameters pre-stored in the database so as to judge whether the testing capability of the to-be-verified devices meets the standards. The sample pipe and the method can be used for repeatedly verifying the testing capability of a plurality of kinds of erosion resistant layer detectors, so that the accuracy of the detectors can be improved, and further the relatively reliable guarantee can be provided for safe use of the pipeline.
Description
Technical field
The present invention relates to long defeated buried pipeline detection technique field, particularly a kind of coupon for the checking of anticorrosive coat detector power of test and verification method.
Background technology
At present, buried pipeline detection technique is mainly around in this three large problem of metal body defect, anti-corrosion insulation layer defects and conduit running environment.The detection of corresponding anti-corrosion insulation layer defects, the main flow detection method developed at present has current method and audio detection method etc. in DC potential gradient method, pipe.
Some the technical papers achievements delivered disclosed in the detection case over more than 20 years of China in long defeated buried pipeline, and the inspection case of our this personal experience in several years, each detection technique has its superiority, also has its limitation.Anticorrosive coat detection technique, abroad or domestic all comparative maturities, the detectability for anticorrosive coat quality is all very strong, but has again its respective feature between distinct methods, distinct device, and some stresses the overall evaluation, some stresses to look for leak source.
Therefore, how could we more effectively use these technical equipment existing to detect long defeated buried pipeline, improve and detect recall rate? up to the present, go back the standard sample of the defeated buried pipeline of the similar length of neither one in this area, contrast verification is carried out to these used equipment.Buried pipeline is laid in underground after all, belong to and cannot see impalpable press device, detect data out after, sometimes accidentally excavate one or two place to carry out verifying, also the authority of the validity of these checkout equipments of contrast of neither one comparison system proves or correlation data disclosed in some both at home and abroad at present.In actual applications, although from testing result, can a lot of defect be found, and excavate some positions and verify, but usually there is the phenomenon that can't detect position.
As can be seen here, how conduit running built-in problem can could be carried out complementary detection by various existing checkout equipment, search out optimum checkout equipment combination, reach the effect of " as long as defectiveness just can detect; do not have defect just not show ", reduce conduit running risk to greatest extent, become the new problem of long defeated buried pipeline detection technique.
Summary of the invention
The object of the invention is to overcome the deficiencies in the prior art, a kind of coupon for the checking of anticorrosive coat detector power of test is provided, by this coupon, repeatedly can verify the power of test of multiple external anti-corrosion layer checkout equipment, improve the accuracy of checkout equipment, thus provide higher guarantee for the safe handling of pipeline.
Another object of the present invention is to provide a kind of verification method for the checking of anticorrosive coat detector power of test realized by said sample pipe.
Technical scheme of the present invention is: a kind of coupon for the checking of anticorrosive coat detector power of test, pipeline comprises metal tube and anticorrosive coat, metal tube surface coating anticorrosive coat, pipeline is distributed with number of drawbacks lines, each defect lines comprises that anticorrosive coat is thinning, anticorrosive coat is damaged and anticorrosive coating peeling; Pipe diameter is 500 ~ 1016mm, duct length >=50m; Pipeline is provided with probe ring, the circuit of the external cathodic protection mode of pipeline.
The thinning distribution situation on pipeline of described anticorrosive coat is as follows:
With the Article 1 circumferential welded seam of low temperature chamber (i.e. the locker room of rock gas) one end close on pipeline for starting point, with the throughput direction of rock gas for visual direction, the radial section of pipeline is considered as clock interface,
The 3 o'clock direction at distance starting point 9m place, arranging the length of side is that the square anticorrosive coat of 15mm is thinning, and anticorrosive coat Reducing thickness is 50%, does not expose metal,
The 4 o'clock direction at distance starting point 17.5m place, arranging the length of side is that the square anticorrosive coat of 20mm is thinning, and anticorrosive coat Reducing thickness is 50%, does not expose metal,
The 8 o'clock direction at distance starting point 25m place, arranging diameter is that the circular anticorrosive coat of 50mm is thinning, and anticorrosive coat Reducing thickness is 50%, does not expose metal,
The 9 o'clock direction at distance starting point 28m place, arranging the length of side is that the square anticorrosive coat of 100mm is thinning, and anticorrosive coat Reducing thickness is 50%, does not expose metal,
The 12 o'clock direction at distance starting point 72m place, arranging the length of side is that the square anticorrosive coat of 100mm is thinning, and anticorrosive coat Reducing thickness is 50%, does not expose metal.
The damaged distribution situation on pipeline of described anticorrosive coat is as follows:
With the Article 1 circumferential welded seam of low temperature chamber one end close on pipeline for starting point, with the throughput direction of rock gas for visual direction, the radial section of pipeline is considered as clock interface,
The 3 o'clock direction at distance starting point 6m place, arrange the circular anticorrosive coat breakage that diameter is 20mm, expose metal, loss rate of metal is 0,
The 4 o'clock direction at distance starting point 12.5m place, arranging length is 8mm, and width is that the rectangle anticorrosive coat of 5mm is damaged, and expose metal, loss rate of metal is 0,
Distance starting point is the 6 o'clock direction of 23.5m, and arrange the circular anticorrosive coat breakage that diameter is 10mm, expose metal, loss rate of metal is 0,
The 8 o'clock direction at distance starting point 35m place, arrange the circular anticorrosive coat breakage that diameter is 20mm, expose metal, loss rate of metal is 0,
The 3 o'clock direction at distance starting point 39.1m place, arranging length is 15mm, and width is that the rectangle anticorrosive coat of 10mm is damaged, and expose metal, loss rate of metal is 0,
The 4 o'clock direction at distance starting point 46m place, arranging length is 8mm, and width is that the rectangle anticorrosive coat of 7mm is damaged, and expose metal, loss rate of metal is 0,
The 8 o'clock direction at distance starting point 55m place, arrange the circular anticorrosive coat breakage that diameter is 10mm, expose metal, loss rate of metal is 0,
The 8 o'clock direction at distance starting point 65m place, arrange the circular anticorrosive coat breakage that diameter is 20mm, expose metal, loss rate of metal is 0,
The 3 o'clock direction at distance starting point 69.5m place, arranging length is 50mm, and width is that the rectangle anticorrosive coat of 30mm is damaged, and expose metal, loss rate of metal is 0,
The 12 o'clock direction at distance starting point 75m place, arrange the circular anticorrosive coat breakage that diameter is 20mm, expose metal, loss rate of metal is 0.
The distribution situation of described anticorrosive coating peeling on pipeline is as follows:
With the Article 1 circumferential welded seam of low temperature chamber one end close on pipeline for starting point, with the throughput direction of rock gas for visual direction, the radial section of pipeline is considered as clock interface,
The 3 o'clock direction at distance starting point 39m place, arranging length is 15mm, and width is the rectangle anticorrosive coating peeling of 10mm, does not expose metal,
The 5 o'clock direction at distance starting point 43m place, arranges the square anticorrosive coating peeling that the length of side is 15mm, does not expose metal,
The 12 o'clock direction at distance starting point 50m place, arranges the circular anticorrosive coating peeling that diameter is 50mm, does not expose metal,
The 9 o'clock direction at distance starting point 60m place, arranges the square anticorrosive coating peeling that the length of side is 200mm, does not expose metal,
The 12 o'clock direction at distance starting point 70m place, arranges the square anticorrosive coating peeling that the length of side is 200mm, does not expose metal.
Described pipeline forms primarily of elbow, pipe nipple and straight tube welding, according to the throughput direction of rock gas, be respectively the first elbow, the first straight tube, the second straight tube, the 3rd straight tube, the 4th straight tube, the 5th straight tube, the first pipe nipple, the second elbow, the second pipe nipple, the 6th straight tube and triple section arm, pipe ends is provided with removable cover, and the depth of burying of pipeline is 1.2m.
Described pipeline is provided with two probe rings, and the junction of the 3rd straight tube and the 4th straight tube is provided with the first probe ring, and the second pipe nipple is provided with the second probe ring.
The present invention realizes a kind of verification method for the checking of anticorrosive coat detector power of test according to said sample pipe, comprises the following steps:
(1) by each defect lines record on coupon, and corresponding for each defect lines parameter is formed database;
(2) coupon is buried the depths of 1.2 meters in underground;
(3) after external anti-corrosion layer checkout equipment being installed, by external anti-corrosion layer checkout equipment corresponding method of testing, coupon is tested, obtain test result;
(4) each parameter in test result and database is analyzed, thus whether the power of test of checking external anti-corrosion layer checkout equipment is up to standard.
In described step (3), the test result of external anti-corrosion layer checkout equipment comprises the embedding location of coupon, the depth of burial of coupon, the position of defect lines on pipeline and the size of defect lines.
In described step (3), when external anti-corrosion layer checkout equipment is tested coupon, by sending an exchange of information source to coupon, now current return can be formed at the defect lines place of coupon, and the signal radiation earthward that will produce, radiation signal directly over defect lines is the strongest, thus each parameter of discriminatory analysis defect lines.
In described step (3), external anti-corrosion layer checkout equipment is C-SCAN pipe detection system, PCM+ electric current mapping system, DCVG DC potential gradient detection system, CIPS close spacing pipe-to-soil potential detection system or WN-58 series of audio detection system, when each external anti-corrosion layer checkout equipment carries out testing authentication, carry out according to its general method of operating.
The present invention, relative to prior art, has following beneficial effect:
This coupon investigates and study rear design further to the problem existing for domestic natural gas pipe network structure, according to the various defective forms that current long defeated buried pipeline produces in actual condition, to draw up out corresponding defect lines at coupon patrix, test is utilized to compare to the equipment intending being used for actual pipeline inspection, find out the equipment combination reaching maximum inspection recall rate, thus improving the accuracy of existing checkout equipment, the safe handling for pipeline provides higher guarantee.
Under the prerequisite that checkout equipment is up to standard, by checkout equipment, the detection of coupon is operated, also can be used for the detection level of test operation personnel, ensure pipe safety better.
Defect lines design on this coupon, gather the sensitive defect that external anti-corrosion layer checkout equipment that the actual defects that finds in the secure administration procedure both at home and abroad in decades about long defeated buried pipeline and domestic and international research institution develop is corresponding, realisticly disclose issuable defect of pipeline situation completely.
When this coupon and verification method thereof use, parameter corresponding for each defect lines can be created as database, make practicable buried long distance pipeline inspection job instruction, be conducive to industry and instruct, also there is directive significance to the research and development of new checkout equipment.
Accompanying drawing explanation
Fig. 1 is the structural representation of this coupon.
Embodiment
Below in conjunction with embodiment, the present invention is described in further detail, but embodiments of the present invention are not limited thereto.
Embodiment
The present embodiment is structure for Guangdong Province's gas distributing system and board design.
A kind of coupon for the checking of anticorrosive coat detector power of test, pipeline comprises metal tube and anticorrosive coat, metal tube surface coating anticorrosive coat, pipeline is distributed with number of drawbacks lines, each defect lines comprises that anticorrosive coat is thinning, anticorrosive coat is damaged and anticorrosive coating peeling; Pipe diameter is 500 ~ 1016mm, duct length >=50m; Pipeline is provided with probe ring, the circuit of the external cathodic protection mode of pipeline.
The thinning distribution situation on pipeline of anticorrosive coat is as follows: with the Article 1 circumferential welded seam of low temperature chamber one end close on pipeline for starting point, with the throughput direction of rock gas for visual direction, the radial section of pipeline is considered as clock interface, the 3 o'clock direction at distance starting point 9m place, arranging the length of side is that the square anticorrosive coat of 15mm is thinning, anticorrosive coat Reducing thickness is 50%, does not expose metal; The 4 o'clock direction at distance starting point 17.5m place, arranging the length of side is that the square anticorrosive coat of 20mm is thinning, and anticorrosive coat Reducing thickness is 50%, does not expose metal; The 8 o'clock direction at distance starting point 25m place, arranging diameter is that the circular anticorrosive coat of 50mm is thinning, and anticorrosive coat Reducing thickness is 50%, does not expose metal; The 9 o'clock direction at distance starting point 28m place, arranging the length of side is that the square anticorrosive coat of 100mm is thinning, and anticorrosive coat Reducing thickness is 50%, does not expose metal; The 12 o'clock direction at distance starting point 72m place, arranging the length of side is that the square anticorrosive coat of 100mm is thinning, and anticorrosive coat Reducing thickness is 50%, does not expose metal.
The damaged distribution situation on pipeline of anticorrosive coat is as follows: with the Article 1 circumferential welded seam of low temperature chamber one end close on pipeline for starting point, with the throughput direction of rock gas for visual direction, the radial section of pipeline is considered as clock interface, the 3 o'clock direction at distance starting point 6m place, the circular anticorrosive coat breakage that diameter is 20mm is set, expose metal, loss rate of metal is 0; The 4 o'clock direction at distance starting point 12.5m place, arranging length is 8mm, and width is that the rectangle anticorrosive coat of 5mm is damaged, and expose metal, loss rate of metal is 0; Distance starting point is the 6 o'clock direction of 23.5m, and arrange the circular anticorrosive coat breakage that diameter is 10mm, expose metal, loss rate of metal is 0; The 8 o'clock direction at distance starting point 35m place, arrange the circular anticorrosive coat breakage that diameter is 20mm, expose metal, loss rate of metal is 0; The 3 o'clock direction at distance starting point 39.1m place, arranging length is 15mm, and width is that the rectangle anticorrosive coat of 10mm is damaged, and expose metal, loss rate of metal is 0; The 4 o'clock direction at distance starting point 46m place, arranging length is 8mm, and width is that the rectangle anticorrosive coat of 7mm is damaged, and expose metal, loss rate of metal is 0; The 8 o'clock direction at distance starting point 55m place, arrange the circular anticorrosive coat breakage that diameter is 10mm, expose metal, loss rate of metal is 0; The 8 o'clock direction at distance starting point 65m place, arrange the circular anticorrosive coat breakage that diameter is 20mm, expose metal, loss rate of metal is 0; The 3 o'clock direction at distance starting point 69.5m place, arranging length is 50mm, and width is that the rectangle anticorrosive coat of 30mm is damaged, and expose metal, loss rate of metal is 0; The 12 o'clock direction at distance starting point 75m place, arrange the circular anticorrosive coat breakage that diameter is 20mm, expose metal, loss rate of metal is 0.
The distribution situation of anticorrosive coating peeling on pipeline is as follows: with the Article 1 circumferential welded seam of low temperature chamber one end close on pipeline for starting point, with the throughput direction of rock gas for visual direction, the radial section of pipeline is considered as clock interface, the 3 o'clock direction at distance starting point 39m place, arranging length is 15mm, width is the rectangle anticorrosive coating peeling of 10mm, does not expose metal; The 5 o'clock direction at distance starting point 43m place, arranges the square anticorrosive coating peeling that the length of side is 15mm, does not expose metal; The 12 o'clock direction at distance starting point 50m place, arranges the circular anticorrosive coating peeling that diameter is 50mm, does not expose metal; The 9 o'clock direction at distance starting point 60m place, arranges the square anticorrosive coating peeling that the length of side is 200mm, does not expose metal; The 12 o'clock direction at distance starting point 70m place, arranges the square anticorrosive coating peeling that the length of side is 200mm, does not expose metal.
As shown in Figure 1, pipeline forms primarily of elbow, pipe nipple and straight tube welding, according to the throughput direction of rock gas, be respectively the first elbow 1, first straight tube 2, second straight tube 3, the 3rd straight tube 4, the 4th straight tube 5, the 5th straight tube 6, first pipe nipple 7, second elbow 8, second pipe nipple 9, the 6th straight tube 10 and triple section arm 11, pipe ends is provided with removable cover, and the depth of burying of pipeline is 1.2m.Wherein, the length of pipe nipple is respectively about 1m.
The junction of the 3rd straight tube and the 4th straight tube is provided with the first probe ring 12, second pipe nipple and is provided with the second probe ring 13, the circuit of the external cathodic protection mode of pipeline.
This coupon be mainly used in verifying external anti-corrosion layer checkout equipment power of test, when this coupon uses, first by each defect lines record on coupon, and make each parameter form database, then according to general buried pipeline, the degree of depth is set, coupon is buried in underground, equipment to be verified is tested coupon by its corresponding method of testing, after obtaining test result, the coupon parameter prestored in test result and database is analyzed, thus judges that whether the power of test of equipment to be verified is up to standard.The principle of external anti-corrosion layer checkout equipment is: by sending an exchange of information source to underground pipeline, when underground, pipeline anticorrosion coating is corroded, current return will be formed at leak source, by the leak source signal radiation earthward produced, and radiation signal is maximum directly over leak source, find according to this principle and Lou lose point, the position of the trend of underground metal pipes, the degree of depth and the hot spot of insulating corrosion layer, leakage point can be found when not excavating, generally can detect the metallic conduit in the 5m of underground, transmitting range 50m ~ 5km.
Realize a kind of verification method for the checking of anticorrosive coat detector power of test according to said sample pipe, comprise the following steps:
(1) by each defect lines record on coupon, and corresponding for each defect lines parameter is formed database;
(2) coupon is buried the depths of 1.2 meters in underground;
(3) after external anti-corrosion layer checkout equipment being installed, by external anti-corrosion layer checkout equipment corresponding method of testing, coupon is tested, obtain test result;
(4) each parameter in test result and database is analyzed, thus whether the power of test of checking external anti-corrosion layer checkout equipment is up to standard.
In step (3), the test result of external anti-corrosion layer checkout equipment comprises the embedding location of coupon, the depth of burial of coupon, the position of defect lines on pipeline and the size of defect lines.
In step (3), when external anti-corrosion layer checkout equipment is tested coupon, by sending an exchange of information source to coupon, now current return can be formed at the defect lines place of coupon, and the signal radiation earthward that will produce, radiation signal directly over defect lines is the strongest, thus each parameter of discriminatory analysis defect lines.
In step (3), external anti-corrosion layer checkout equipment is C-SCAN pipe detection system, PCM+ electric current mapping system, DCVG DC potential gradient detection system, CIPS close spacing pipe-to-soil potential detection system or WN-58 series of audio detection system, when each external anti-corrosion layer checkout equipment carries out testing authentication, carry out according to its general method of operating.
As mentioned above, just can realize the present invention preferably, above-described embodiment is only preferred embodiment of the present invention, is not used for limiting practical range of the present invention; Namely all equalizations done according to content of the present invention change and modify, all by the claims in the present invention scope required for protection is contained.
Claims (10)
1. for the coupon of anticorrosive coat detector power of test checking, it is characterized in that, pipeline comprises metal tube and anticorrosive coat, metal tube surface coating anticorrosive coat, pipeline is distributed with number of drawbacks lines, each defect lines comprises that anticorrosive coat is thinning, anticorrosive coat is damaged and anticorrosive coating peeling; Pipe diameter is 500 ~ 1016mm, duct length >=50m; Pipeline is provided with probe ring, the circuit of the external cathodic protection mode of pipeline.
2., according to claim 1 for the coupon of anticorrosive coat detector power of test checking, it is characterized in that, the thinning distribution situation on pipeline of described anticorrosive coat is as follows:
With the Article 1 circumferential welded seam of low temperature chamber one end close on pipeline for starting point, with the throughput direction of rock gas for visual direction, the radial section of pipeline is considered as clock interface,
The 3 o'clock direction at distance starting point 9m place, arranging the length of side is that the square anticorrosive coat of 15mm is thinning, and anticorrosive coat Reducing thickness is 50%, does not expose metal,
The 4 o'clock direction at distance starting point 17.5m place, arranging the length of side is that the square anticorrosive coat of 20mm is thinning, and anticorrosive coat Reducing thickness is 50%, does not expose metal,
The 8 o'clock direction at distance starting point 25m place, arranging diameter is that the circular anticorrosive coat of 50mm is thinning, and anticorrosive coat Reducing thickness is 50%, does not expose metal,
The 9 o'clock direction at distance starting point 28m place, arranging the length of side is that the square anticorrosive coat of 100mm is thinning, and anticorrosive coat Reducing thickness is 50%, does not expose metal,
The 12 o'clock direction at distance starting point 72m place, arranging the length of side is that the square anticorrosive coat of 100mm is thinning, and anticorrosive coat Reducing thickness is 50%, does not expose metal.
3. according to claim 1 for the coupon of anticorrosive coat detector power of test checking, it is characterized in that, the damaged distribution situation on pipeline of described anticorrosive coat is as follows:
With the Article 1 circumferential welded seam of low temperature chamber one end close on pipeline for starting point, with the throughput direction of rock gas for visual direction, the radial section of pipeline is considered as clock interface,
The 3 o'clock direction at distance starting point 6m place, arrange the circular anticorrosive coat breakage that diameter is 20mm, expose metal, loss rate of metal is 0,
The 4 o'clock direction at distance starting point 12.5m place, arranging length is 8mm, and width is that the rectangle anticorrosive coat of 5mm is damaged, and expose metal, loss rate of metal is 0,
Distance starting point is the 6 o'clock direction of 23.5m, and arrange the circular anticorrosive coat breakage that diameter is 10mm, expose metal, loss rate of metal is 0,
The 8 o'clock direction at distance starting point 35m place, arrange the circular anticorrosive coat breakage that diameter is 20mm, expose metal, loss rate of metal is 0,
The 3 o'clock direction at distance starting point 39.1m place, arranging length is 15mm, and width is that the rectangle anticorrosive coat of 10mm is damaged, and expose metal, loss rate of metal is 0,
The 4 o'clock direction at distance starting point 46m place, arranging length is 8mm, and width is that the rectangle anticorrosive coat of 7mm is damaged, and expose metal, loss rate of metal is 0,
The 8 o'clock direction at distance starting point 55m place, arrange the circular anticorrosive coat breakage that diameter is 10mm, expose metal, loss rate of metal is 0,
The 8 o'clock direction at distance starting point 65m place, arrange the circular anticorrosive coat breakage that diameter is 20mm, expose metal, loss rate of metal is 0,
The 3 o'clock direction at distance starting point 69.5m place, arranging length is 50mm, and width is that the rectangle anticorrosive coat of 30mm is damaged, and expose metal, loss rate of metal is 0,
The 12 o'clock direction at distance starting point 75m place, arrange the circular anticorrosive coat breakage that diameter is 20mm, expose metal, loss rate of metal is 0.
4., according to claim 1 for the coupon of anticorrosive coat detector power of test checking, it is characterized in that, the distribution situation of described anticorrosive coating peeling on pipeline is as follows:
With the Article 1 circumferential welded seam of low temperature chamber one end close on pipeline for starting point, with the throughput direction of rock gas for visual direction, the radial section of pipeline is considered as clock interface,
The 3 o'clock direction at distance starting point 39m place, arranging length is 15mm, and width is the rectangle anticorrosive coating peeling of 10mm, does not expose metal,
The 5 o'clock direction at distance starting point 43m place, arranges the square anticorrosive coating peeling that the length of side is 15mm, does not expose metal,
The 12 o'clock direction at distance starting point 50m place, arranges the circular anticorrosive coating peeling that diameter is 50mm, does not expose metal,
The 9 o'clock direction at distance starting point 60m place, arranges the square anticorrosive coating peeling that the length of side is 200mm, does not expose metal,
The 12 o'clock direction at distance starting point 70m place, arranges the square anticorrosive coating peeling that the length of side is 200mm, does not expose metal.
5. according to claim 1 for the coupon of anticorrosive coat detector power of test checking, it is characterized in that, described pipeline forms primarily of elbow, pipe nipple and straight tube welding, according to the throughput direction of rock gas, be respectively the first elbow, the first straight tube, the second straight tube, the 3rd straight tube, the 4th straight tube, the 5th straight tube, the first pipe nipple, the second elbow, the second pipe nipple, the 6th straight tube and triple section arm, pipe ends is provided with removable cover, and the depth of burying of pipeline is 1.2m.
6. according to claim 5 for the coupon of anticorrosive coat detector power of test checking, it is characterized in that, described pipeline is provided with two probe rings, and the junction of the 3rd straight tube and the 4th straight tube is provided with the first probe ring, and the second pipe nipple is provided with the second probe ring.
7. according to any one of claim 1 ~ 6, coupon realizes a kind of verification method for the checking of anticorrosive coat detector power of test, it is characterized in that, comprises the following steps:
(1) by each defect lines record on coupon, and corresponding for each defect lines parameter is formed database;
(2) coupon is buried the depths of 1.2 meters in underground;
(3) after external anti-corrosion layer checkout equipment being installed, by external anti-corrosion layer checkout equipment corresponding method of testing, coupon is tested, obtain test result;
(4) each parameter in test result and database is analyzed, thus whether the power of test of checking external anti-corrosion layer checkout equipment is up to standard.
8. according to claim 7 a kind of for anticorrosive coat detector power of test checking verification method, it is characterized in that, in described step (3), the test result of external anti-corrosion layer checkout equipment comprises the embedding location of coupon, the depth of burial of coupon, the position of defect lines on pipeline and the size of defect lines.
9. according to claim 7 a kind of for anticorrosive coat detector power of test checking verification method, it is characterized in that, in described step (3), when external anti-corrosion layer checkout equipment is tested coupon, by sending an exchange of information source to coupon, now can current return be formed at the defect lines place of coupon, and the signal radiation earthward that will produce, radiation signal directly over defect lines is the strongest, thus each parameter of discriminatory analysis defect lines.
10. according to claim 7 a kind of for anticorrosive coat detector power of test checking verification method, it is characterized in that, in described step (3), external anti-corrosion layer checkout equipment is C-SCAN pipe detection system, PCM+ electric current mapping system, DCVG DC potential gradient detection system, CIPS close spacing pipe-to-soil potential detection system or WN-58 series of audio detection system.
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| CN201510293552.0A CN104897856A (en) | 2015-06-01 | 2015-06-01 | Sample pipe for verifying testing capability of erosion resistant layer detector, and verifying method |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108663408A (en) * | 2018-05-18 | 2018-10-16 | 中国石油天然气集团公司 | A kind of steel oil-gas pipeline Directional Drilling erosion resistant coating breakage rate determines method |
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