WO2018043775A1 - Dispositif de sélection de mode d'onde basé sur un diagnostic de corrosion sous une isolation et son procédé de fonctionnement - Google Patents

Dispositif de sélection de mode d'onde basé sur un diagnostic de corrosion sous une isolation et son procédé de fonctionnement Download PDF

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Publication number
WO2018043775A1
WO2018043775A1 PCT/KR2016/009847 KR2016009847W WO2018043775A1 WO 2018043775 A1 WO2018043775 A1 WO 2018043775A1 KR 2016009847 W KR2016009847 W KR 2016009847W WO 2018043775 A1 WO2018043775 A1 WO 2018043775A1
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energy
wave mode
pipe
propagation component
wall region
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PCT/KR2016/009847
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English (en)
Korean (ko)
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이동훈
조현준
허윤실
김병덕
조영도
이연재
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한국가스안전공사
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Publication of WO2018043775A1 publication Critical patent/WO2018043775A1/fr

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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
    • G01N17/04—Corrosion probes
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N29/00—Investigating or analysing materials by the use of ultrasonic, sonic or infrasonic waves; Visualisation of the interior of objects by transmitting ultrasonic or sonic waves through the object
    • G01N29/44—Processing the detected response signal, e.g. electronic circuits specially adapted therefor

Definitions

  • the present invention is a method for selecting an induced ultrasonic wave mode that can effectively diagnose the insulation under corrosion (CUI, Corrosion Under Insulation) generated in the pipe in consideration of the energy attenuation characteristics in the pipe is protected by the outer wall wrapped with a heat insulating material It is about.
  • CCI insulation under corrosion
  • Guided ultrasound is a wave propagating in the longitudinal direction along the geometrical shape of the structure, the longitudinal wave and the transverse wave propagating in the longitudinal direction along the geometrical structure of the structure is formed by a number of reflections and overlapping between the walls of the structure.
  • the guided ultrasonic waves may be used to diagnose the integrity of the pipe through a method of analyzing the size, shape, and characteristics of the wave reflected from the pipe defect by injecting ultrasonic waves at a predetermined angle into the pipe.
  • the outer wall of the pipe is generally wrapped and protected with various insulating materials, and in the case of these pipes, it is essential to diagnose the Corrosion Under Insulation (CUI) to maintain soundness.
  • CCI Corrosion Under Insulation
  • the thermal insulation material surrounding the outer wall of the pipe induces the energy attenuation characteristics in the pipe to attenuate the energy of the guided ultrasonic waves traveling along the pipe. Disturb.
  • the present invention has been made in view of the above circumstances, and an object of the present invention is to provide thermal insulation corrosion generated in pipes in consideration of energy attenuation characteristics in pipes in which outer walls are covered with a heat insulating material and protected. In order to effectively diagnose under insulation, it is to select the wave mode of the induced ultrasonic wave.
  • a wave mode selection apparatus includes a frequency and a phase for each of a plurality of wave modes capable of generating an induced ultrasonic wave in a pipe having a fixed thickness between an inner wall and an outer wall.
  • a confirmation unit for confirming a waveform structure illustrated by selecting a combination of frequency and phase velocity based on a dispersion curve representing a functional relationship between velocity;
  • An analysis unit analyzing an energy displacement distribution of a propagation component which each of the plurality of wave modes has in the pipe based on the waveform structure;
  • selecting a specific wave mode capable of diagnosing Corrosion Under Insulation (CUI) among the plurality of wave modes according to the energy attenuation characteristics of the pipe based on the energy displacement distribution of the propagation component. Characterized in that it comprises a selection unit.
  • the energy displacement distribution of the propagation component is the energy displacement distribution of the axial propagation component and the circumferential propagation component in each of the outer wall region, the inner wall region, and the center region between the outer wall region and the inner wall region of the pipe. And at least one of the energy displacement distribution of and the energy displacement distribution of the radial propagation component.
  • the energy attenuation characteristic of the pipe, the energy attenuation in at least one of the outer wall region and the inner wall region includes an energy attenuation characteristic greater than the threshold value compared to the energy attenuation in the central region of the pipe. It features.
  • the specific wave mode is characterized in that the axial propagation component comprises a wave mode in which variation in energy magnitude seen in the outer wall region, the inner wall region, and the central region is within a threshold.
  • the specific wave mode is characterized in that it comprises a wave mode in which the energy magnitude of the axial propagation component is greater than the energy magnitude of the circumferential propagation component and the radial propagation component.
  • the specific wave mode is characterized in that it comprises a wave mode in which the energy magnitude of the axial propagation component is seen in the central region is greater than the energy magnitude seen in the outer wall region and the inner wall region.
  • Operation method of the wave mode selection device for each of a plurality of wave modes that can generate an ultrasonic wave in the pipe having a fixed thickness between the inner wall and the outer wall, Identifying a waveform structure illustrated by selecting a combination of frequency and phase velocity based on a dispersion curve representing a function relationship between frequency and phase velocity; An analysis step of analyzing an energy displacement distribution of a propagation component which each of the plurality of wave modes has in the pipe based on the waveform structure; And selecting a specific wave mode capable of diagnosing Corrosion Under Insulation (CUI) among the plurality of wave modes according to the energy attenuation characteristics of the pipe based on the energy displacement distribution of the propagation component. Characterized in that it comprises a selection step.
  • CLI Corrosion Under Insulation
  • the energy displacement distribution of the propagation component is the energy displacement distribution of the axial propagation component and the circumferential propagation component in each of the outer wall region, the inner wall region, and the center region between the outer wall region and the inner wall region of the pipe. And at least one of the energy displacement distribution of and the energy displacement distribution of the radial propagation component.
  • the energy attenuation characteristic of the pipe, the energy attenuation in at least one of the outer wall region and the inner wall region includes an energy attenuation characteristic greater than the threshold value compared to the energy attenuation in the central region of the pipe. It features.
  • the specific wave mode is characterized in that the axial propagation component comprises a wave mode in which variation in energy magnitude seen in the outer wall region, the inner wall region, and the central region is within a threshold.
  • the specific wave mode is characterized in that it comprises a wave mode in which the energy magnitude of the axial propagation component is greater than the energy magnitude of the circumferential propagation component and the radial propagation component.
  • the specific wave mode is characterized in that it comprises a wave mode in which the energy magnitude of the axial propagation component is seen in the central region is greater than the energy magnitude seen in the outer wall region and the inner wall region.
  • the wave mode selection apparatus and the method of operation of the present invention in consideration of the energy attenuation characteristics in the pipe that is covered with the outer wall is protected by the heat insulating material by selecting the wave mode that can minimize the amount of energy attenuation of the ultrasonic wave generated in the pipe Enables effective diagnosis of insulated corrosion.
  • FIG. 1 is a view for explaining a wave mode selection environment of the ultrasonic wave according to an embodiment of the present invention.
  • FIG. 2 is a view for explaining the configuration of the wave mode selection apparatus according to an embodiment of the present invention.
  • 3 to 8 are exemplary diagrams for explaining the analysis of the energy distribution of the radio wave component according to an embodiment of the present invention.
  • FIG. 9 is a flow chart for explaining the operation flow in the wave mode selection apparatus according to an embodiment of the present invention.
  • FIG. 1 illustrates a wave mode selection environment of an ultrasonic wave according to an embodiment of the present invention.
  • the wave mode selection environment of the induced ultrasonic wave generates the induced ultrasonic waves through the transducers (2, 3) installed on the outer circumferential surface of the pipe (1) and at the same time the pipe (1)
  • Diagnosis apparatus 100 for diagnosing the integrity of the pipe 1 by receiving the guided ultrasonic waves through the (), and wave mode selection device for selecting the wave mode of the guided ultrasonic wave used for diagnosis prior to the soundness diagnosis of the pipe (1) It may have a configuration that includes (200).
  • the pipe (1) refers to a fluid transport path used in industrial equipment, such as petrochemical plants, which can be understood as an insulating pipe that is protected by the outer wall of the pipe is protected by a variety of heat insulating material due to the constraints of the pipe.
  • the heat insulating material that audits the outer wall of the pipe 1 attenuates the energy of the induced ultrasonic waves traveling along the pipe. If the fluid is transported through the pipe 1, the outer wall and the inner wall of the pipe 1 are also reduced. Similarly, energy attenuation of induced ultrasonic waves due to fluid is generated.
  • the energy of the induced ultrasonic wave is attenuated in the inner wall region as well as the outer wall region.
  • the energy attenuation characteristics of the pipe 1 may be selected from the outer wall region and the inner wall region.
  • the energy decay amount in at least one region will be defined as being greater than or equal to the threshold compared to the energy decay amount in the central region.
  • the threshold associated with the amount of energy attenuation may be defined as various values depending on the setting.
  • the diagnostic apparatus 100 diagnoses Corrosion Under Insulation (CUI) generated in the pipe 1 through guided ultrasonic waves, and thus the pipe 1 has The energy attenuation characteristic significantly reduces the energy of the induced ultrasonic waves via the pipe 1, making it impossible to diagnose normal protective load corrosion.
  • CCI Corrosion Under Insulation
  • FIG. 2 shows a schematic configuration of a wave mode selection device 200 according to an embodiment of the present invention.
  • the wave mode selection apparatus 200 is a confirmation unit 210 for confirming the wave structure of the wave mode of the induced ultrasonic wave, pipes for each wave mode of the induced ultrasonic wave (1)
  • Analysis unit 220 for analyzing the energy displacement distribution of the propagation component to have within
  • selector 230 for selecting a specific wave mode for diagnosing the thermal load corrosion based on the analysis results of the energy displacement distribution of the radio wave component It may have a configuration that includes).
  • the whole or at least part of the configuration of the wave mode selection apparatus 200 including the identification unit 210, the analysis unit 220, and the selection unit 230 may be implemented in the form of a hardware module or in the form of a software module. Can be.
  • the software module may be understood as an instruction executed by a processor that processes an operation in the wave mode selection apparatus 200, and the instruction may have a form stored in the wave mode selection apparatus 200.
  • the wave mode selection apparatus 200 can effectively diagnose the thermal load corrosion generated in the pipe 1 in consideration of the energy attenuation characteristics of the pipe 1 through the above configuration.
  • the specific wave mode of the induced ultrasonic wave may be selected.
  • the functions of the respective components in the wave mode selection device 200 will be described in detail.
  • the wave mode of the induced ultrasonic wave uses two subscripts 'circumferential order' and 'mode number' when the traveling direction of the induced ultrasonic wave is the longitudinal direction of the pipe (1).
  • the 'circumferential order' is '0', it is symmetrical about the axis of the pipe (1). If it is not '0', it is not symmetrical about the axis of the pipe (1).
  • 'circumferential order' when 'circumferential order' is '0', it indicates axisymmetric modes, which are again referred to as longitudinal mode (hereinafter referred to as 'L mode') and Torsional mode (hereinafter referred to as 'T mode'). Waves are distinguished according to their oscillation in the wall (between the outer and inner surfaces) of the pipe (1).
  • 'F mode' Flexural mode
  • the vibration component of the wave exists in all three directions (radius, circumference, axis) in the wall of the pipe (1).
  • L and T modes have an infinite number of modes in '0' and 'circumferential order' in 'circumferential order' even if 'circumferential order' is '1,2,3, ..., M'.
  • the L mode symmetrical with respect to the axial direction will be described as an example, and the wave mode selection device (assuming that the thickness between the inner wall and the outer wall of the pipe 1 is fixed) 200) The description of each component will be continued.
  • the identification unit 210 processes a function of confirming a waveform structure for each wave mode of the induced ultrasonic wave.
  • the identification unit 210 confirms the waveform structure illustrated through the selection of frequency and phase velocity combinations based on the dispersion curves of each of the plurality of wave modes capable of generating guided ultrasonic waves in the pipe 1. do.
  • the dispersion curve represents a functional relationship between the frequency, the thickness of the pipe 1, and the phase speed.
  • the dispersion relationship between the frequency and the phase speed is assumed. Can be understood as.
  • the guided ultrasonic waves have dispersibility in which the propagation speed varies depending on the shape of the pipe 1 and the excitation frequency, and the phase velocity, which is the theoretical propagation speed of the guided ultrasonic waves, is a condition that overlaps each wave from the wave equation. It can be calculated by finding the solution.
  • the dispersion curve showing the functional relationship between the phase velocity and the frequency of the induced ultrasonic wave having a dispersibility is, for example, the Korea Gas Safety Corporation induced ultrasonic dispersion diagram program [KGS-GWDC, Registration No .: C-2016-010196]. It can be derived through, but is not limited to this can include all programs that can represent the functional relationship between the phase speed and frequency of the ultrasonic wave.
  • the waveform structure can be illustrated as a result of analyzing the energy displacement distribution of the propagation component in each of the outer wall region, the inner wall region, and the central region between the outer wall region and the inner wall region of the pipe 1 as a vector component.
  • the energy displacement distribution of the propagation component includes the energy displacement distribution U Z of the axial propagation component in each of the outer wall region, the inner wall region, and the center region of the pipe 1, and the energy displacement distribution U ⁇ of the circumferential propagation component. ), And the energy displacement distribution U r of the radial propagation component.
  • Such a waveform structure can be illustrated through, for example, 'Korea Gas Safety Corporation Induction Ultrasonic Waveform Structure Program [KGS-GWWS, Registration No .: C-2016-010197]', but is not limited thereto.
  • any program that can illustrate the waveform structure by selecting a combination of frequency and phase velocity can be included.
  • FIGS. 3 to 8 illustrate through the selection of a dispersion curve (a) showing a function relationship of phase velocity and frequency for each mode in the L mode and a combination of frequency and phase velocity in the dispersion curve. Examples of the waveform structure (b) are shown.
  • the horizontal axis fd represents the product of the frequency and the thickness of the pipe 1
  • the vertical axis represents the phase velocity
  • the horizontal axis represents a magnitude of energy (amplitude) of the propagation component
  • the vertical axis represents a thickness of the pipe 1.
  • the analyzer 220 processes a function of analyzing the energy displacement distribution of the radio wave component for each wave mode.
  • the analysis unit 220 confirms the waveform structure illustrated through the selection of the frequency and phase velocity combination based on the dispersion curve for each wave mode, the outer wall region of the pipe 1 from the waveform structure, Analyze the energy displacement distribution of the axial propagation component U Z , the energy displacement distribution of the circumferential propagation component U ⁇ , and the energy displacement distribution of the radial propagation component U r in the inner wall region and the central region, respectively. Done.
  • FIG. 3 shows a waveform structure illustrated in the case where a combination of frequency '0.1 MHz' and phase velocity '5.391 mm / ⁇ s' is selected from the dispersion curve a of the wave mode 'L [0,2]' Giving.
  • the energy displacement distribution of the propagation component is concentrated in the axial propagation component U Z most of the energy propagated in the pipe 1, and the energy displacement distribution of the axial propagation component U Z is the outer wall region, It can be analyzed that there is a slight gradient (about 20%) between the inner wall regions.
  • FIG. 5 shows a waveform structure illustrated in the case where a combination of frequency '0.25 MHz' and phase velocity '5.139 mm / ⁇ s' is selected from the dispersion curve a of the wave mode 'L [0,2]' Giving.
  • the energy displacement distribution of the propagation component is larger in the energy propagation of the radial propagation component U r in the inner surface of the pipe 1 than in the previous case, and the energy displacement distribution of the axial propagation component U Z is the outer wall region, It can be analyzed that there is a gradient (about 40%) between the inner wall regions, which can be understood as the region where the dispersibility of the propagation component begins.
  • FIG. 6 shows a waveform structure illustrated in the case where a combination of frequency '0.3 MHz' and phase velocity '4.829 mm / ⁇ s' is selected from the dispersion curve a of the wave mode 'L [0,2]' Giving.
  • the energy displacement distribution of the propagation component can be analyzed that the energy displacement distribution of the axial propagation component U Z is small in the outer wall region and the inner wall region and concentrated in the central region. This can be understood as a difficult area.
  • FIG. 7 shows a waveform structure illustrated in the case where a combination of frequency '0.4 MHz' and phase velocity '3.567 mm / ⁇ s' is selected from the dispersion curve a of the wave mode 'L [0,2]' Giving.
  • the energy displacement distribution of the propagation component may be analyzed as the energy displacement distribution of the axial propagation component U Z is small in the outer wall region and the inner wall region and concentrated in the center region, as in the analysis result of FIG. 6.
  • the dispersion of components is deepened, it can be understood as an area where signal analysis is difficult.
  • FIG. 8 shows a waveform structure illustrated in the case where a combination of frequency '0.5MHz' and phase velocity '3.193mm / ⁇ s' is selected from the dispersion curve a of the wave mode 'L [0,2]' Giving.
  • the selecting unit 230 processes a function of selecting a wave mode for diagnosing the thermal insulation corrosion.
  • the selector 230 considers the energy attenuation characteristics of the pipe 1 based on the analysis result when the analysis of the energy displacement distribution of the propagation component that each wave mode has in the pipe 1 is completed. By selecting the wave mode to diagnose the thermal load corrosion.
  • selecting the wave mode may be understood not only to select the wave mode itself but also to select a combination of frequency and phase velocity in the selected wave mode.
  • the energy attenuation characteristic of the pipe 1 has been previously defined as the amount of energy attenuation in at least one of the outer wall region and the inner wall region is larger than a threshold value compared to the energy reduction amount in the central region.
  • the selector 230 selects a wave mode for diagnosing the thermal load corrosion as a wave mode for which the energy magnitude of the axial propagation component is larger than the circumferential propagation component and the radial propagation component.
  • a sufficient inspection distance can be secured only when the energy is concentrated in the axial propagation component and the axial propagation component rather than the radial propagation component.
  • the selector 230 selects a wave mode in which the axial propagation component has a variation in the magnitude of energy seen in the outer wall region, the inner wall region, and the center region within a threshold as a wave mode for diagnosing the thermal insulation corrosion.
  • the axial propagation component has a small variation in energy magnitudes seen in the outer wall region, the inner wall region, and the central region within a threshold value, and the dispersibility of the axial propagation component is small.
  • the dispersibility of the axial propagation component is small.
  • the axial propagation component has a difference in the magnitude of energy seen in the outer wall region, the inner wall region, and the central region exceeding the threshold, that is, when the dispersion of the axial propagation component is large, the signal reception time for the axial propagation component is It becomes longer and is not suitable for the diagnosis of thermal load corrosion.
  • the selector 230 selects a wave mode in which an axial propagation component has an energy magnitude larger than that seen in the center wall region and an inner wall region as a wave mode for diagnosing the thermal insulation corrosion.
  • selecting a wave mode in which the axial propagation component is larger than the energy magnitude seen in the center region and the inner wall region is such that the amount of energy attenuation in at least one of the outer wall region and the inner wall region is changed in the center region. This is to consider the energy attenuation characteristics of the pipe (1) larger than the threshold value compared to the amount of energy attenuation.
  • the amount of energy lost by the energy attenuation characteristic of the piping 1 can be minimized. It can be understood that minimizing the amount of energy lost by the energy attenuation characteristic of N) can be remotely diagnosed and the accuracy of the diagnosis can be improved.
  • the selector 230 has an energy magnitude of the axial propagation component larger than the circumferential propagation component and the radial propagation component
  • the selection unit 230 has an axial propagation component having an outer wall region, an inner wall region
  • the wave mode for diagnosing thermal load corrosion is selected as the wave mode where the deviation of the energy magnitude seen in the central region is within the threshold and the energy magnitude in the axial propagation component is greater than the energy magnitude seen in the outer wall region and the inner wall region.
  • the selection result of the selection unit 230 is, for example, the frequency '0.1MHz' from the dispersion curve a of the wave mode described with reference to FIG. 3 or 4, that is, 'L [0,2]'. And a combination of phase velocity '5.391mm / ⁇ s' or a combination of frequency '0.2MHz' and phase velocity '5.227mm / ⁇ s' from the dispersion curve (a) of 'L [0,2]'. Can be.
  • the energy attenuation amount of the induced ultrasonic wave is minimized in consideration of the energy attenuation characteristic of the pipe that is protected by the outer wall of the insulation.
  • the verification unit 210 derives the dispersion curves of each of the plurality of wave modes capable of generating the induced ultrasonic waves in the pipe 1 according to the steps 'S110' to 'S130' and based on the derived dispersion curve
  • the waveform structure shown is identified through the selection of frequency and phase velocity combinations.
  • the dispersion curve showing the functional relationship between the phase velocity and the frequency of the induced ultrasonic waves for example, can be derived through the 'Korea Gas Safety Corporation guided ultrasonic dispersion diagram program [KGS-GWDC, Registration No .: C-2016-010196]'. Can be.
  • the waveform structure can be illustrated, for example, through the 'Korea Gas Safety Corporation Induction Ultrasonic Waveform Structure Program [KGS-GWWS, Registration No .: C-2016-010197]'.
  • the pipe 1 may be removed from the corresponding waveform structure according to step S140.
  • the selector 230 performs the energy of the pipe 1 based on the analysis result according to step S150. Considering the damping characteristics, select the wave mode to diagnose the thermal load corrosion.
  • the selector 230 selects a wave mode for diagnosing the thermal load corrosion as a wave mode for which the energy magnitude of the axial propagation component is larger than the circumferential propagation component and the radial propagation component.
  • a sufficient inspection distance can be secured only when the energy is concentrated in the axial propagation component and the axial propagation component rather than the radial propagation component.
  • the selector 230 selects a wave mode in which the axial propagation component has a variation in the magnitude of energy seen in the outer wall region, the inner wall region, and the center region within a threshold as a wave mode for diagnosing the thermal insulation corrosion.
  • the dispersion of the axial propagation component is small that the variation in the magnitude of energy seen in the outer wall region, the inner wall region, and the central region is within a threshold.
  • the axial propagation component has a difference in the magnitude of energy seen in the outer wall region, the inner wall region, and the central region exceeding the threshold, that is, when the dispersion of the axial propagation component is large, the signal reception time for the axial propagation component is It becomes longer and is not suitable for the diagnosis of thermal load corrosion.
  • the selector 230 selects a wave mode in which an axial propagation component has an energy magnitude larger than that seen in the center wall region and an inner wall region as a wave mode for diagnosing the thermal insulation corrosion.
  • selecting a wave mode in which the axial propagation component is larger than the energy magnitude seen in the center region and the inner wall region is such that the amount of energy attenuation in at least one of the outer wall region and the inner wall region is changed in the center region. This is to consider the energy attenuation characteristics of the pipe (1) larger than the threshold value compared to the amount of energy attenuation.
  • the amount of energy lost by the energy attenuation characteristic of the piping 1 can be minimized. It can be understood that minimizing the amount of energy lost by the energy attenuation characteristic of N) can be remotely diagnosed and the accuracy of the diagnosis can be improved.
  • the selector 230 has an energy magnitude of the axial propagation component larger than the circumferential propagation component and the radial propagation component
  • the selection unit 230 has an axial propagation component having an outer wall region, an inner wall region
  • the wave mode for diagnosing thermal load corrosion is selected as the wave mode where the deviation of the energy magnitude seen in the central region is within the threshold and the energy magnitude in the axial propagation component is greater than the energy magnitude seen in the outer wall region and the inner wall region.
  • the selection result of the selection unit 230 is, for example, the frequency '0.1MHz' from the dispersion curve a of the wave mode described with reference to FIG. 3 or 4, that is, 'L [0,2]'. And a combination of phase velocity '5.391mm / ⁇ s' or a combination of frequency '0.2MHz' and phase velocity '5.227mm / ⁇ s' from the dispersion curve (a) of 'L [0,2]'. Can be.
  • the amount of energy attenuation of the induced ultrasonic wave is minimized in consideration of the energy attenuation characteristic of the pipe in which the outer wall is covered with a heat insulating material in the operation flow in the wave mode selection apparatus 200 according to the embodiment of the present invention.
  • Implementations of the subject matter described in this specification may be implemented in digital electronic circuitry, computer software, firmware or hardware including the structures and structural equivalents disclosed herein, or one or more of them. It can be implemented in combination. Implementations of the subject matter described herein are one or more computer program products, ie one or more modules pertaining to computer program instructions encoded on a program storage medium of tangible type for controlling or by the operation of a processing system. Can be implemented.
  • the computer readable medium may be a machine readable storage device, a machine readable storage substrate, a memory device, a composition of materials affecting a machine readable propagated signal, or a combination of one or more thereof.
  • system encompasses all the instruments, devices, and machines for processing data, including, for example, programmable processors, computers, or multiple processors or computers.
  • the processing system may include, in addition to hardware, code that forms an execution environment for a computer program on demand, such as code constituting processor firmware, a protocol stack, a database management system, an operating system, or a combination of one or more thereof. .
  • Computer programs may be written in any form of programming language, including compiled or interpreted languages, or a priori or procedural languages. It can be deployed in any form, including components, subroutines, or other units suitable for use in a computer environment. Computer programs do not necessarily correspond to files in the file system.
  • a program may be in a single file provided to the requested program, in multiple interactive files (eg, a file that stores one or more modules, subprograms, or parts of code), or part of a file that holds other programs or data. (Eg, one or more scripts stored in a markup language document).
  • the computer program may be deployed to run on a single computer or on multiple computers located at one site or distributed across multiple sites and interconnected by a communication network.
  • Computer-readable media suitable for storing computer program instructions and data include, for example, semiconductor memory devices such as EPROM, EEPROM, and flash memory devices, such as magnetic disks such as internal hard disks or external disks, magneto-optical disks, and CDs. It may include all types of nonvolatile memory, media and memory devices, including -ROM and DVD-ROM disks.
  • semiconductor memory devices such as EPROM, EEPROM, and flash memory devices, such as magnetic disks such as internal hard disks or external disks, magneto-optical disks, and CDs. It may include all types of nonvolatile memory, media and memory devices, including -ROM and DVD-ROM disks.
  • the processor and memory can be supplemented by or integrated with special purpose logic circuitry.
  • Implementations of the subject matter described herein may include, for example, a backend component such as a data server, or include a middleware component such as, for example, an application server, or a web browser or graphical user, for example, where a user may interact with the implementation of the subject matter described herein. It may be implemented in a computing system that includes a front end component, such as a client computer with an interface, or any combination of one or more of such back end, middleware or front end components. The components of the system may be interconnected by any form or medium of digital data communication such as, for example, a communication network.

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Abstract

La présente invention concerne un dispositif de sélection de mode d'onde et son procédé de fonctionnement, le dispositif permettant un diagnostic efficace de la corrosion sous une isolation, qui se produit dans une canalisation protégée par un matériau d'isolation englobant une paroi extérieure de la canalisation, par sélection d'un mode d'onde, une quantité d'atténuation d'énergie d'un ultrason induit pouvant être réduite au minimum, en tenant compte d'une caractéristique d'atténuation d'énergie dans la canalisation.
PCT/KR2016/009847 2016-09-01 2016-09-02 Dispositif de sélection de mode d'onde basé sur un diagnostic de corrosion sous une isolation et son procédé de fonctionnement WO2018043775A1 (fr)

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