CN106855494B - Acoustic emission detection device for storage tank bottom plate - Google Patents
Acoustic emission detection device for storage tank bottom plate Download PDFInfo
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- CN106855494B CN106855494B CN201510730998.5A CN201510730998A CN106855494B CN 106855494 B CN106855494 B CN 106855494B CN 201510730998 A CN201510730998 A CN 201510730998A CN 106855494 B CN106855494 B CN 106855494B
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Abstract
The invention provides a sound emission detection device for a bottom plate of a storage tank, which comprises a storage tank A, a storage tank B, a circulating system A and a circulating system B, wherein the storage tank A consists of an upper tank body, a lower tank body and a base, the upper tank body consists of a tank wall and a tank top, the tank top of the upper tank body is provided with a vent valve, a pressure gauge and a safety valve, the tank wall of the upper tank body is provided with a liquid inlet and a supporting device, the lower tank body consists of a tank wall and a tank bottom, the tank wall of the lower tank body is provided with a liquid outlet, the tank bottom of the lower tank body is provided with a leakage pipeline, the storage tank B consists of a tank body and a base, the tank body consists of a tank wall, a tank top and a tank bottom, the tank top is provided with a manhole, a vent valve, a pressure gauge and a safety valve, the; the liquid outlet of the storage tank A is connected with the liquid inlet of the storage tank B through the circulating system A, and the liquid outlet of the storage tank B is connected with the liquid inlet of the storage tank A through the circulating system B.
Description
Technical Field
The invention relates to a device for acoustic emission detection, in particular to an acoustic emission detection device which is suitable for defects of corrosion, leakage and the like of a bottom plate of an oil product storage tank.
Background
In the petroleum, petrochemical and storage industries, a large number of metal storage tanks for crude oil, finished oil and dangerous chemicals are used for storage and production of oil products or chemical raw materials. Most of the media have the characteristics of flammability, explosiveness, corrosion and the like, have the characteristics of large storage capacity of a single tank body, large number of tank bodies and the like, cause great economic loss once an accident occurs, and influence the life and property safety of people.
The storage tank bottom plate is the most severely corroded area in the storage tank, and the key area for the storage tank maintenance detection is the storage tank bottom plate. The tank bottom detection can be carried out by some nondestructive detection equipment after the tank is normally stopped and cleaned. For some large tanks, the overall process may take more than 30 days, so the associated costs are quite high. On the other hand, according to the current maintenance strategy, the tank which is subjected to tank cleaning inspection with a large amount of cost may be a good tank which does not need to be maintained, the situation is frequently generated in practical work, and the service life of the tank body is continuously prolonged along with the improvement of materials, construction and maintenance methods in recent years, so that the safe operation of the tank body is ensured to a certain extent through regular maintenance, but the economical efficiency of the regular maintenance seriously affects the operation cost. It is often the case that some tanks have suffered severe corrosion before routine maintenance, while other tanks have reached the point of routine maintenance far less harmful corrosion.
The acoustic emission detection of the tank bottom of the storage tank is a non-invasive, non-stop production, non-cleaning tank, economic and applicable tank bottom corrosion condition assessment technology capable of carrying out on-line detection. The existing research means comprises indoor tests and field tests, but the field tests need to be verified by opening a tank and adopting other nondestructive testing methods, and are often difficult to realize. Therefore, laboratory tests are an important means to study acoustic emission detection techniques.
In the existing storage tank acoustic emission detection test device, an acoustic emission source is mostly simulated by a manual method. Yan river design's test device adopts hammer and stone excitation to produce the acoustic emission signal, and the analog signal is different with the storage tank corruption and the characteristics of leaking the acoustic emission signal that produces, has brought very big obstacle to the research of later stage signal processing method and mode identification. Patent CN 202795842U adopts fixture to fix the defect test piece in storage tank bottom plate center, receives fixture and this body acoustic coupling of storage tank to influence, and acoustic emission signal characteristic will change, is unfavorable for gathering true corrosion signal characteristic, because defect test piece rigidity, this patent can not be used for defect source location and the acoustic emission research of bottom plate leakage, adopts the accurate control that electronic force (forcing) pump is unfavorable for jar body pressure. The storage tank bottom plate corrosion simulation source device in patent CN 203758893U can only be used for generating acoustic emission signals, and acoustic emission detection test research of defect source location and leakage cannot be carried out. In addition, due to the kaiser effect of the metal material, the same defect does not generate an obvious acoustic emission signal until the load reaches the maximum load applied last time, and due to the limited design pressure of the test equipment, the utilization rate of the indoor test equipment is low or the storage tank needs to be replaced frequently. The reasons influence the research of the storage tank bottom plate acoustic emission detection technology in China.
Disclosure of Invention
The invention aims to provide a storage tank bottom plate acoustic emission detection device which can simulate acoustic emission signals of corrosion and leakage of a storage tank bottom plate, is convenient for researching a processing method of a defect acoustic emission signal of the storage tank bottom plate, and can meet the test requirements of the storage tank bottom plate acoustic emission detection research.
The invention provides a storage tank bottom plate acoustic emission detection device, which comprises a storage tank A, a storage tank B and a circulating system, wherein the storage tank A and the storage tank B are connected through the circulating system, and the acoustic emission detection device comprises:
the storage tank A consists of an upper tank body, a lower tank body and a base, wherein the upper tank body and the lower tank body are connected through flanges; the upper tank body consists of a tank wall and a tank top, the lower tank body consists of a tank wall and a tank bottom, the tank top of the upper tank body is provided with a vent valve, a pressure gauge and a safety valve, the tank wall of the upper tank body is provided with a liquid inlet and a supporting device, the tank wall of the lower tank body is provided with a liquid outlet, the tank bottom of the lower tank body is provided with a leakage pipeline,
the storage tank B consists of a tank body and a base, the tank body is located above the base and consists of a tank wall, a tank top and a tank bottom, the tank top is provided with a manhole, an emptying valve, a pressure gauge and a safety valve, the tank bottom is provided with a leakage pipeline, and the tank wall is provided with a liquid inlet and a liquid outlet;
the circulation system includes circulation system A and circulation system B, circulation system A includes pipeline, pump, manometer and check valve according to the material flow direction set gradually pump, manometer and check valve on the pipeline, storage tank A's liquid outlet is connected through circulation system A and storage tank B's inlet, circulation system B includes pipeline, pump, manometer and check valve according to the material flow direction set gradually pump, manometer and check valve on the pipeline, storage tank B's liquid outlet is connected through circulation system B and storage tank A's inlet.
In the device, the diameters of the upper tank body and the lower tank body of the storage tank A are the same, and the lower tank body is located above the base.
In the device, the tank wall and the tank top of the storage tank are connected in a welding mode, and the tank wall and the tank bottom are connected in a welding mode.
In the device, the emptying valves at the tops of the storage tanks A and B are connected with a manual pressurizing pump, and the storage tanks are pressurized by the manual pressurizing pump.
In the device, a manhole of the tank top of the storage tank B is sealed by a manhole cover plate and a flange.
In the device, the tank bottoms of the storage tank A and the storage tank B are processed to have corrosion defects.
In the device, the supporting device comprises a fixed frame, a lead screw and a lead screw base, wherein the fixed frame is connected with the tank wall of the upper tank body, the lead screw is connected with the fixed frame through threads, and the lead screw base is positioned below the fixed frame; after flange bolts connected with the upper tank body and the lower tank body are loosened, the screw rod is rotated downwards, the screw rod base can provide an upward acting force for the upper tank body, the upper tank body moves upwards, the lower tank body can be moved out, corrosion defects can be conveniently machined on the tank bottom of the lower tank body, the lower tank body can be replaced at any time, and the test requirement of repeated and controllable acoustic emission detection can be met by replacing the lower tank body.
In the device, more than two supporting devices are symmetrically arranged in the circumferential direction of the upper tank body of the storage tank A.
In the device, the tank walls of the storage tank A and the storage tank B which are 0.1-0.5 m away from the tank bottom are provided with acoustic emission sensors.
Compared with the prior art, the acoustic emission detection device for the storage tank bottom plate has the following advantages:
1. the invention can simulate the acoustic emission signals generated by corrosion and leakage of the bottom plate of the storage tank, and meet the repeated and controllable requirements of an acoustic emission detection test, and during the test, the acoustic emission sensor is arranged on the wall plate which is 0.1-0.5 m higher than the bottom plate, and is consistent with the detection method in the metal storage tank acoustic emission detection standard, so that the site detection working condition can be truly restored, and the requirements of the test research and guidance for site detection are met.
2. The invention directly processes corrosion defects at the bottom of the storage tank, can eliminate the change of corrosion signal characteristics caused by test piece coupling, and can carry out positioning research on the acoustic emission source.
3. According to the invention, the storage tank A is designed in a split type, and the screw rod device is designed, so that the defects of the storage tank bottom plate processing test are facilitated to the greatest extent, the lower tank body is convenient to replace in the split type design, and the repeated and controllable requirements of the acoustic emission test are met; the liquid storage tank B is designed into a test tank, so that corrosion acoustic emission test research can be carried out, the utilization rate of equipment is improved, the change of acoustic emission signals with different leakage amounts can be observed in real time, and the comparison research of the leakage amounts is carried out.
4. The invention adopts a manual pressing mode, can simplify the test device and realize accurate and controllable pressure of the test storage tank.
Drawings
FIG. 1 is a schematic structural diagram of an acoustic emission testing apparatus for a storage tank floor according to the present invention;
FIG. 2 is a schematic structural view of a storage tank A;
FIG. 3 is a schematic structural view of a storage tank B;
fig. 4 is a schematic structural view of the supporting device of the storage tank a.
Detailed Description
As shown in fig. 1-4, the present invention provides a storage tank floor acoustic emission detection device, which comprises a storage tank a1, a storage tank B2, a circulation system a and a circulation system B, wherein the storage tank a1 is composed of an upper tank 11, a lower tank 12 and a base 15, the upper tank 11 and the lower tank 12 are connected by flanges and provided with sealing rings; the upper tank body 11 is composed of a tank wall 10 and a tank top 13, the lower tank body 12 is composed of a tank wall 10 and a tank bottom 14, the tank top 13 of the upper tank body 11 is provided with an emptying valve 131, a pressure gauge 132 and a safety valve 133, the tank wall 10 of the upper tank body 11 is provided with a liquid inlet 111 and a supporting device 112, the supporting device 112 is symmetrically arranged along the circumferential direction of the tank wall of the upper tank body 11, the supporting device comprises a fixing frame 112, a lead screw 113 and a lead screw base 114, the fixing frame 112 is connected with the tank wall 10 of the upper tank body 11, the lead screw 113 is in threaded connection with the fixing frame 112, and the lead screw base 114 is positioned below the fixing frame 112; after flange bolts connected with the upper tank body and the lower tank body are loosened, the screw rod 113 is rotated downwards, the screw base 114 provides upward acting force for the upper tank body 11, so that the upper tank body 11 moves upwards and moves out of the lower tank body 12, the corrosion defect on the tank bottom 14 is convenient to process, and the requirement of repeated and controllable test of acoustic emission detection can be met by replacing the lower tank body; the tank wall 10 of the lower tank body 12 is provided with a liquid outlet 121, the tank bottom 14 of the lower tank body 12 is provided with a leakage pipeline 141, and the leakage amount is controlled by a valve to simulate an acoustic emission signal generated when the storage tank leaks.
The storage tank B2 is composed of a tank body 20 and a base 24, the tank body 20 is located above the base 24, the tank body 20 is composed of a tank wall 21, a tank top 22 and a tank bottom 23, the tank top 22 is provided with a manhole 221, an emptying valve 222, a pressure gauge 224 and a safety valve 223, the tank top 22 is provided with the manhole 221, the manhole cover is connected by a flange, the tank bottom 23 is provided with a leakage pipeline 231, the leakage amount is controlled by the valve to simulate the acoustic emission signal generated when the storage tank leaks, the acoustic emission signal can be compared with the storage tank A for research, and the acoustic emission signals generated by different leakage amounts are compared in real time; a liquid inlet 211 and a liquid outlet 212 are arranged on the tank wall 21;
the circulating system consists of a circulating system A and a circulating system B; the circulating system A consists of a pump 311, a pressure gauge 312, a one-way valve 313 and a pipeline 314, the pump 311, the pressure gauge 312 and the one-way valve 313 are sequentially arranged on the pipeline 314 according to the material flowing direction, and a liquid outlet 121 of the storage tank A is connected with a liquid inlet 211 of the storage tank B through the circulating system A; the circulating system B is composed of a pump 321, a pressure gauge 322, a one-way valve 323 and a pipeline 324, the pump 321, the pressure gauge 322 and the one-way valve 323 are sequentially arranged on the pipeline 324 according to the material flowing direction, and the liquid outlet 212 of the storage tank B is connected with the liquid inlet 111 of the storage tank A through the circulating system B. When liquid in the storage tank B is injected into the storage tank A through the circulating system B, the emptying valve 222 of the storage tank B is opened, the liquid outlet 121 and the leakage pipeline 141 of the storage tank A are closed, the emptying valve 131 is opened, the storage tank A is kept connected with the atmosphere, when the liquid in the storage tank A reaches a preset position, the liquid inlet 111 is closed, the manual pressurizing pump is connected with the emptying valve 131, the pressure in the storage tank A is accurately controlled according to the pressure gauge 132, the acoustic emission signal generated by corrosion defects on the tank bottom 14 is obtained, the acoustic emission signal generated when the tank bottom leaks is obtained by controlling the opening degree of the valve on the leakage pipeline 141, and the safety valve 132 protects the storage tank A and prevents the storage tank A from overpressure; similarly, liquid in the storage tank A is discharged into the storage tank B through the circulating system A, and acoustic emission signals generated by corrosion and leakage of the storage tank B are obtained. Liquid is injected through the manhole 221 of the storage tank B, and the characteristics of acoustic emission signals generated by different leakage amounts can be compared and researched in real time by controlling the opening degrees of the valves of the leakage pipelines 141 and 231. Arranging an acoustic emission sensor on the wall of the lower half part of the tank body 12 or the lower half part of the storage tank B below the storage tank A according to detection requirements, performing corrosion acoustic emission test research on the bottom plate of the storage tank by controlling the pressure of the storage tank A or the storage tank B, and performing leakage acoustic emission test research on the bottom plate of the storage tank by controlling the leakage valve 141 or the leakage valve 231. And two groups of acoustic emission sensors are arranged on the storage tank A and the storage tank B respectively, and acoustic emission signal characteristic analysis research under different leakage amounts is carried out.
As described above, the invention can respectively carry out corrosion and leakage acoustic emission detection tests, can also carry out corrosion and leakage acoustic emission detection tests simultaneously, can meet the repeated and controllable test requirements of the storage tank bottom plate leakage and corrosion defect acoustic emission detection, and can be used for the research of storage tank bottom plate acoustic emission detection positioning, signal processing and signal mode identification.
Claims (7)
1. A storage tank floor acoustic emission testing device, the device is including storage tank A, storage tank B, circulation system A and circulation system B, wherein:
the storage tank A consists of an upper tank body, a lower tank body and a base, wherein the upper tank body and the lower tank body are connected through flanges; the upper tank body consists of a tank wall and a tank top, the lower tank body consists of a tank wall and a tank bottom, the tank top of the upper tank body is provided with a vent valve, a pressure gauge and a safety valve, the tank wall of the upper tank body is provided with a liquid inlet and a supporting device, the tank wall of the lower tank body is provided with a liquid outlet, and the tank bottom of the lower tank body is provided with a leakage pipeline;
the storage tank B consists of a tank body and a base, the tank body is located above the base and consists of a tank wall, a tank top and a tank bottom, the tank top is provided with a manhole, an emptying valve, a pressure gauge and a safety valve, the tank bottom is provided with a leakage pipeline, and the tank wall is provided with a liquid inlet and a liquid outlet;
the circulating system A consists of a pump, a pressure gauge, a one-way valve and a pipeline, the pump, the pressure gauge and the one-way valve are sequentially arranged on the pipeline according to the material flowing direction, and a liquid outlet of the storage tank A is connected with a liquid inlet of the storage tank B through the circulating system A;
the circulating system B is composed of a pump, a pressure gauge, a one-way valve and a pipeline, the pump, the pressure gauge and the one-way valve are sequentially arranged on the pipeline according to the material flowing direction, and a liquid outlet of the storage tank B is connected with a liquid inlet of the storage tank A through the circulating system B.
2. The apparatus of claim 1, wherein: the wall, the top and the bottom of the storage tank are connected in a welding mode.
3. The apparatus of claim 1, wherein: and the emptying valves at the tops of the storage tanks A and B are connected with a manual pressurizing pump, and the storage tanks are pressurized by the manual pressurizing pump.
4. The apparatus of claim 1, wherein: and a manhole of the tank top of the storage tank B is sealed by a manhole cover plate and a flange.
5. The apparatus of claim 1, wherein: the tank bottoms of the storage tank A and the storage tank B are processed to have corrosion defects.
6. The apparatus of claim 1, wherein: the supporting device comprises a fixing frame, a lead screw and a lead screw base, the fixing frame is connected with the tank wall of the upper tank body, the lead screw is connected with the fixing frame through threads, and the lead screw base is located below the fixing frame.
7. The apparatus of claim 1, wherein: the supporting devices are symmetrically arranged on the upper tank body of the storage tank A in the circumferential direction.
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| CN201510730998.5A CN106855494B (en) | 2015-12-08 | 2015-12-08 | Acoustic emission detection device for storage tank bottom plate |
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| CN201510730998.5A CN106855494B (en) | 2015-12-08 | 2015-12-08 | Acoustic emission detection device for storage tank bottom plate |
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| CN107271567A (en) * | 2017-08-01 | 2017-10-20 | 广东石油化工学院 | A kind of comprehensive experimental device and method for acoustic emission detection |
| CN107238662A (en) * | 2017-08-11 | 2017-10-10 | 广东石油化工学院 | A kind of experimental provision and detection method for storage tank acoustic emission detection |
| CN111141828B (en) * | 2019-12-23 | 2022-08-23 | 中国特种设备检测研究院 | Integrated experiment platform for storage tank failure simulation and state monitoring |
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