KR100400681B1 - Heat Exchanger Life Assessment System(HELAS) - Google Patents

Abstract

The present invention can precisely measure the depth of corrosion of the inner surface of the tube by using a flaw detector that radially scans the ultrasonic beam radially through the heat exchanger or the inner diameter of the small-diameter tube, as well as the remaining life of the tube according to the degree of corrosion The present invention relates to a device for measuring corrosion and residual life of a pipe, wherein the flaw detection means detects the degree of corrosion of an inner wall of the pipe using ultrasonic signals through water introduced into the pipe and introduced through a hose, Connecting means for connecting the lakes to the lake connected to the flaw detection means, and at the same time, disconnecting the coaxial cable connected to the flaw detection means from the hose and electrically connecting the control means to the lake through the hose; Remove the air and foreign matter contained in the feed water supplied to the connecting means and flaw detection means, and Filtration means for controlling a water pressure, and outputs a signal according to the generation of ultrasonic beams to the flaw detection means or receives the ultrasonic signal again through the flaw detection means to detect the degree of corrosion of the pipe, by using the corrosion data detected at this time It is characterized by including control means for calculating various results.

Description

Pipe Corrosion and Residual Life Measurement System {Heat Exchanger Life Assessment System (HELAS)}

The present invention relates to a device for measuring the degree of corrosion and residual life of the tube, and more particularly, the depth of corrosion of the inner surface of the tube by using a flaw detector that radially scans the ultrasonic beam radially through the heat exchanger or the inner diameter of the small diameter tube. The present invention relates to a device for measuring corrosion and residual life of a pipe, which can measure the accuracy of the pipe as well as the remaining life of the pipe according to the degree of corrosion.

In general, heat exchange or other small diameter tubes, which are used in petrochemical industry, power plants, and general chemical industry for cooling, condensing, heating, and evaporating fluids and gases, are used for exchanging fluid heat from the outside or the inside.

The heat exchanger may be of various types, such as a multi-tube type, air-cooled type, but in general, a multi-tube type is most commonly used for multipurpose applications from low pressure to high pressure, from low temperature to high temperature.

In particular, in the multi-pipe heat exchanger, the inner flow of the coolant is easily corroded due to friction with the fluid, foreign matters on the fluid, scale, water treatment, etc. Sometimes you have to stop.

Therefore, companies with heat exchangers focus on preventing leaks by periodically checking pipes for corrosion or corrosion.

In most cases, however, these tubes are characterized by small diameters and long lengths. Endoscope cameras are mainly used to detect corrosion of the inner wall, but the endoscope is less than 8 meters long and cannot measure the depth of corrosion. The endoscope reveals only the visual image inside the tube, that is, basic phenomena such as scale, color, and protrusion. In addition, there is a problem that it takes a lot of time to see a large amount of coffins.

In another method, a pipe is cut mechanically by destructive test method and then the corrosion is measured by visual and mechanical methods. This method is also difficult to extricate and the efficiency of the heat exchanger is reduced due to the premise that the extubation must be blocked. In addition, since the extubation is limited to one or two copies, it is unreasonable to evaluate the whole in the state of a very small number of extruded tubes. In addition, since the time and cost required for the installation of one copy are expensive, they are uneconomical.

In addition, in the case of similar equipment that has been used internationally since the last decade, IRIS9000 equipment of the United States first, the rate of measurement, display method, inspection speed, precision of the device or data measuring corrosion using ultrasonic waves. This is because the data collection rate is 33%, because the impeller rotation is less than 2000 RPM, and the display method is B-SCAN, which shows only one cycle of thickness on one screen, making it difficult to know the state of adjacent areas. However, the interpretation of the signal is greatly influenced by the tester's skill, and is inadequate for the inspection of pipes with a short inspection time at a very low speed of 30 mm per second in terms of inspection speed.

In general, in terms of precision, as the amount of data transmitted and received increases, the number of data collected increases.

However, since the B-SCAN ultrasonic apparatus has a data transmission / reception speed of less than 1000 per second and does not have a comprehensive system that can continuously store and utilize the data, it is impossible to interpret or compare various detection data. It was a situation. In addition, the most important thing in this measuring method is that the probe set should be concentric with the tube in the test tube, so that the accuracy is high. If one of the three concentric retainers in the tube is subjected to spring forces by internal debris, the two will be useless.

Therefore, a problem arises also in maintaining a center.

On the other hand, FREND in Japan only sees a separate simple corrosion section, and there is no analysis software for the overall evaluation. In the form of processing the signal received by the gate signal from the ultrasonic flaw detection equipment, there is a complex and bulky disadvantage in the form of the tube inspection device body and the ultrasonic flaw detection device separated.

In addition, the sampling rate of the impeller is up to 2400 RPM, similar to the IRIS900 equipment in the United States.

However, since the number of rotations of the impeller cannot be confirmed, the sampling rate of the corrosion signal is unclear, and since the octagonal steel ring is used as the concentric circle retaining material to maintain the concentric circles with the pipe, it is difficult to maintain concentric circles due to the lack of elasticity. Has the disadvantage of falling somewhat.

The present invention has been made to solve the above problems, an object of the present invention is to measure the internal corrosion of the heat exchanger tube or other small diameter tube, to solve the problems of conventional sampling fracture (cutting) inspection and endoscopy In order to solve the problem, the present invention provides an apparatus for measuring corrosion and residual life of pipes with excellent performance, structure and precision, and easy to move on site.

It is another object of the present invention to estimate the estimated corrosion depth of an unexamined pipe by using extreme statistical analysis method using the corrosion depths of the sampled pipe, and to calculate the remaining life of the pipe to enable the life management of the heat exchanger. The present invention provides a device for measuring corrosion and residual life.

Another object of the present invention is to compensate for the problem of underestimation of the initial thermal bridge life of the annual aging change and extreme statistical analysis method, so that the life cycle can be known in advance using the application of the corrosion propagation coefficient and the annual inspection results. It is to provide a corrosion and life measuring device of a pipe.

The present invention for achieving the above object is a flaw detection means for detecting the degree of corrosion of the inner wall of the tube by using the ultrasonic wave signal is inserted into the heat exchanger or small diameter tube flowing through the hose, and the supply water A connecting means for connecting the lakes with each other so as to flow into the lake connected to the flaw detection means, and at the same time, separating the coaxial cable connected to the flaw detection means from the hose and electrically connecting the control means through the inside of the hose; Filter means for removing the air and foreign substances contained in the supply water supplied to the connecting means and the flaw detection means, and adjust the appropriate water pressure, and outputs a signal according to the ultrasonic beam generation to the flaw detection means or through the flaw detection means The ultrasonic signal is input again and the degree of corrosion of the pipe is detected. In the apparatus for measuring corrosion and residual life of the pipe including a control means for calculating various results by using, The flaw detection means, the end of the locking groove is inserted into the fixing ring, the rear end of the screw portion screwed with the head; A head cap composed of a fixing ring inserted into the locking groove; A plurality of discharge holes are formed in the front end portion of the hollow and water and ultrasonic signals are discharged, a reflector mounted inside the discharge holes to refract the ultrasonic beam at a predetermined angle, a locking jaw supporting the double bearings, and a plurality of intermediate portions formed in the middle portion. An impeller composed of a small hole and a rotary blade composed of a plurality of spirals at a rear end thereof and supported in the head cap through the double bearing; A probe holder connected to a rear end of the head cap and forming a plurality of spiral protrusions on an outer circumferential surface thereof so that a flow of water flowing from the hose is a rapid flow; It is installed in the front end and the rear end in order to fix the angle of the threaded portion provided to be coupled to the thread of the head cap and the center rod in the front and rear end in the hollow, and the probe holder and waterproof probe included therein, provided that the protrusion A head consisting of a pair of washers; A center rod connected to a rear end of the head, connected through a hose nipple connected to a hose, and having a coaxial cable configured to apply an electrical signal to the transducer therein; And it is inserted into the outer circumferential surface of the head cap, head and center rod screwed, to reduce the distance between the tube and the outer diameter of the subject, the bulk of the elastic material is inserted into a plurality of bending grooves formed on the outer circumferential surface to facilitate mobility in the tube A holding material comprising ash; Has the features, including.

1 is a block diagram of a corrosion and residual life measurement apparatus of a tube according to an embodiment of the present invention,

2 is a sectional side view showing main parts of the flaw detection means according to the present invention;

3 is a perspective view of a head cap, a head and a center rod according to the present invention;

4 is a front, side cross-sectional view of the head cap according to the present invention;

5 is a configuration diagram of an impeller according to the present invention,

6 is a perspective view of a reflector according to the present invention;

7 is a perspective view of a fixing ring according to the present invention,

8 is a front, side cross-sectional view of the head according to the present invention;

9 is a block diagram of a probe holder according to the present invention;

10 is a tablet of a washer according to the present invention. Cross Section,

11 is a front, side cross-sectional view of the center rod according to the present invention;

12 is a side sectional view of a hose nipple according to the present invention;

13 is a side sectional view of a main portion of a connecting means according to the present invention;

14 is a block diagram of a filtration means according to the present invention,

15 is a view showing a flaw detection range of the flaw detection means according to the present invention;

16A and 16B illustrate an example of a screening result displayed on a screen according to the present invention.

<Explanation of symbols for the main parts of the drawings>

100: flaw detection means 200: connection means

300: filtering means 400: control means

Hereinafter, with reference to the accompanying drawings will be described in detail the configuration of the present invention.

1 is a block diagram showing an apparatus for measuring corrosion and residual life of a tube according to the present invention.

First, 100 is a flaw detection means, and detects the degree of corrosion of the inner wall of the tube (T) by using ultrasonic signals through the water introduced through the hose (190) inserted into the heat exchanger or the small-diameter tube (T). Device.

200 is a connecting means, which connects the lakes to each other so that the supply water flows into the lake 190 connected to the flaw detection means 100, and at the same time, the coaxial cable 191 connected to the flaw detection means 100 through the hose 190. ) Is separated from the hose 190, so that the supply water does not leak, it is an apparatus that allows the coaxial cable 191 to be electrically connected to the control means (400).

300 is a filtering means, and removes air and foreign matter contained in the feed water supplied to the flaw detection means 100 through the lake 190, and is a device for adjusting the water pressure.

400 is a control means, the ultrasonic input / output unit 410 for outputting a signal according to the generation of the ultrasonic beam to the flaw detection means 100 or the ultrasonic signal through the flaw detection means 100, and the ultrasonic input / output The signal converter 420 converts the analog signal input and output through the unit 410 into a digital signal, and analyzes and calculates the detection data due to corrosion inputted through the signal converter 420 into various data. The control unit 430, the display unit 440 for displaying and outputting the corrosion degree detected by the output of the control unit 430 in a predetermined form, and the various according to the corrosion data detected by the output of the control unit 430 A printing unit 450 for printing and outputting information, and a key input unit 460 for inputting key commands according to various types of information detection to the control unit 430.

In addition, the control unit 430 stores various programs in a built-in memory. According to the present invention, a 'collection program' indicating a degree of corrosion is a numerical value, an 'interpretation program' for interpreting corrosion data, and an 'extreme value'. Statistical analysis program, signal converter adjustment program, etc., and various reports outputted by these programs include inspection summary reports such as design data and inspection conditions, position maps and inspection points of inspection objects, and corrosion measurement result lists. , Residual life analysis results, residual life trend results, and field data for maximum measured corrosion.

In addition, according to the present invention, the control unit 430, the display unit 440, the printing unit 450 and the key input unit 460 of the control means 400 may be implemented by a personal computer.

2 is a side cross-sectional view showing main parts of the flaw detection means 100 in detail.

As shown, the flaw detection means 100 is inserted into the heat exchanger or small-diameter tube (T) is composed of a large head cap 110, the head 120 and the center rod 130 is connected to the screw connection type And, the hose 190 for supplying water through the hose nipple 140 is fastened to the rear end of the center rod 130, the center rod 130 and the inside of the hose 190, the electric signal waterproof probe ( Coaxial cable 191 to be transmitted to 180 is fastened to the waterproof probe 180.

In addition, the outer circumferential surfaces of the head cap 110, the head 120 and the center rod 130 in order to match the center of the tube (T) and the center of the flaw detection means 100 in the inside of the tube (T), A holding material 193 made of a synthetic resin (or aluminum) material having a plurality of bending grooves is inserted therein, and the bending groove formed in the holding material 193 is finally made of a bulk of an elastic material (eg, a brush) to maintain concentric circles. Ash 192 is mounted and configured.

In addition, the holding material 193 is made of various sizes and manufactured to a size close to the inner diameter of the tube to be inspected, the Velcro 192 to facilitate the movement during the axial flaw of the tube (T).

In addition, the head cap 110, the head 120 and the center rod 130, as shown in Figure 3, the incision surface 110a formed by cutting flat at 90 ° intervals on the outer circumference of the hollow, and Form a circumferential groove (110b) formed at regular intervals in the circumferential direction to make it easy to fit when the concentric retaining material (193) is inserted, Velcro material (192) generated during the inspection is partially worn and the pipe (T ) When the eccentricity is reduced from the inside, the measurement accuracy decreases due to the eccentricity. Therefore, when the concentric circular retaining material 193 is rotated from time to time during inspection, the Velcro material 193 wears uniformly. It is possible to rotate by processing. In addition, this configuration serves to prevent the deformation of the flaw detection means 100 to be straight in a straight line by the external or internal action (distribution of force).

On the other hand, the head cap 110 is hollow, as shown in Figure 4, the locking groove 111 is inserted into the fixing ring 170 is inserted into the front end, the rear end is screwed with the head 120 The threaded portion 112 is formed.

In addition, an impeller 150 as shown in FIG. 5 is mounted inside the head cap 110. The impeller 150 is hollow, and the front end portion 151 has a plurality of discharges such that water and ultrasonic signals are discharged. Discharge holes 152 are formed, and the double bearing 112 is inserted into the front end of the locking step 158 so that the impeller 150 smoothly rotates in the head cap 110.

In addition, a plurality of small holes 154 are provided in the middle portion 153 of the impeller 150, and a plurality of (eg, six) rotating blades 156 are formed in the rear end portion 155.

Therefore, the impeller 150 flows out of the water passing through the spiral acceleration channel of the probe holder 160 while hitting the rotary blade 156 of the impeller 150, and at this time, the impeller (supported by the bearing 112) 150 will be rotated at high speed.

The reason why the impeller 150 is hollow is a means for reaching the reflector 157 mounted inside the tip 151 without passing the ultrasonic beam B through the water inside the impeller hollow without being disturbed by the medium. The discharge hole 152 is a window through which the water rotated by the impeller 150 flows out, and the small hole 154 is transmitted through the hollow (cavity) inside the impeller and reflected through the reflector 157. The window is opened so that the transmission and reception of the ultrasonic beam (B) toward the inner wall of the tube (T).

The size of the windows 152 and 154 having this function is processed to a suitable size to suppress the optimum rotation and vibration through a lot of tests.

In addition, since the weight of the impeller 150 is related to the rotational force, it is made of stainless steel, which is a material that is as thin and strong as possible and has abrasion resistance and corrosion resistance, and greatly reduces the weight by taking out windows in various directions.

In addition, the front end of the impeller 150 is integrally mounted with a reflector 157 that can reflect the ultrasonic wave in the form of a mirror surface having a 45 ° angle to transmit and receive the ultrasonic beam (B) at 90 ° to the inner wall. .

6 is a detailed configuration diagram of the reflector 157 according to the present invention. The reflector 157b is formed by cutting one side of a cylindrical shape at an angle of 45 °, and a groove having a predetermined size to reduce weight on the other side. It is comprised by the formed groove | hole 157b.

The reflector 157 reflects the ultrasonic beam B at an angle of 90 ° toward the inner wall of the tube T through the reflector 157b having an angle of 45 °.

In addition, since the impeller 150 and the fuselage is assembled in the fuselage, the center of gravity must be fitted so that there is no eccentricity or vibration due to the action of the centrifugal force caused by the rotation.

If there is vibration or eccentricity, the ultrasonic beam B cannot be sent at 90 ° in the direction of the wall of the tube T, resulting in a measurement error or inferior efficiency in collecting corrosion data.

Therefore, for the center of gravity of the reflector 157 itself, the weight of the groove hole 157a for reducing weight on the heavy side is to be the center of gravity, so that the vibration does not occur during high-speed rotation.

7 is a perspective view showing the configuration of the fixing ring 170 according to the present invention, the fixing ring 170 is a steel wire (0.5) to be inserted into the locking groove 111 formed in the front end of the head cap 110 to be used mm, piano line) to provide a sensing unit 171 formed by bending to the end of the reflector 157 so that the end is 90 ° in the direction of winding the ring in the form of a ring, and the other side is rolled into a ring to give a gap. When mounted on the head cap 110 is a structure having elasticity.

The thickness of the fixing ring 170 is slightly larger than the depth of the locking groove 111 of the head cap 110 to serve as a jaw to prevent separation of the impeller 150.

In addition, the ring is inserted into the groove by the ring's own tension like the spring, not by soldering or other joining methods.The ring and the pin are integrally inserted into the pin groove when it collides with foreign matter (protrusion scale) that may be generated inside the pipe. Therefore, no pin dropout occurs.

8 is a front, side cross-sectional view showing the configuration of the head 120, the hollow, the front end portion is provided with a screw portion 121 to be coupled with the screw portion 112 of the head cap 110, the rear end portion The threaded portion 122 is formed to be coupled to the center rod 130.

In addition, the probe holder 160 as shown in FIG. 9 is in close contact with the inside of the head. Three helical protrusions 161 are formed on the outer circumferential surface of the probe holder 160, so that the incoming water is discharged while rotating by the channel formed by the helical protrusion 161, so that the accelerated water pressure and flow rate The impeller 150 is rotated at a high speed.

In addition, the probe holder 160 serves to close and fix the waterproof probe 180 therein so that water does not fall into the gap, and the probe 180 is always parallel to the center of the flaw detector 100. It is positioned so that the ultrasonic beam (B) can always transmit and receive so that the 90 ° to the inner wall of the tube (T).

In addition, the front and rear ends of the head 120 to prevent the push of the transducer 180, and to insert the washers 121, 122 as shown in Figure 10 for fixing.

The washers 121 and 122 have a structure capable of fixing a position without disturbing the flow of water, and forming protrusions 123 at 180 ° intervals to prevent the movement of the probe holder 160 and the probe 180. do.

11 is a front side cross-sectional view showing a center rod 130, the front end is provided with a screw portion 141 is fastened to the head 120, the rear end is formed with a screw portion 132 is fastened to the hose nipple 140. do. In addition, a coaxial cable 191 is connected to the waterproof probe 180 inside the center rod 130.

12 is a side cross-sectional view showing the configuration of the hose nipple 140 according to the present invention, the hose nipple 140 is a medium for connecting the flaw detection means 100 and the water supply hose 190, the center A threaded portion 141 coupled to the rod 130 and a connection portion 142 connected to the hose 190 are formed, and the connection portion 142 is provided with a locking portion 143 to completely engage the hose 190. Do it. This is because the front and rear movement of the flaw detection means 100 (movement for measurement) during the flaw detection of the pipe T should not be easily separated because it uses a hose. It is a structure used to connect the hose with the connecting jig.

Therefore, the flaw detector according to the present invention configured as described above is introduced into the spiral channel of the probe holder 160 when water is supplied to the hose 190, so that the inflow pressure (about 3 kfg / cm ² ) is constant. As the cross-sectional area of the fluid decreases rapidly, the impeller 150 is caused by the strong impingement of the rotary blade 156 on the impeller 150 while rapidly exiting the channel formed by the spiral protrusion 161 of the probe holder 160. The bearing 112 rotates at high speed due to the pressure and flow of water.

At this time, the electrical signal generated from the control means 400 is transmitted to the ultrasonic submerged point focus probe 180 is inserted into the flaw detection means 100 via the coaxial cable 191 is inserted into the hose 190. Since the transducer 180 vibrates, the ultrasonic beam B exits using the water as a transmission medium and is reflected by the 45 ° reflector 156 to focus and send the ultrasonic beam B perpendicular to the inner wall of the tube T. .

The ultrasonic beam B detects a time difference reflected by the inner wall of the tube and returns to detect corrosion data.

As shown in Figure 2, L1 is the radius of the original tube (T), L2 is the radius of the corroded portion (T1), it is detected using this difference.

In addition, the transmission and reception of the ultrasonic wave is made more than 10,000 times per second impeller 150 is supported on the head cap 110 by a double bearing 112, the impeller 150 is a high-speed rotation (5000RPM) pipe (T) Densely inspect the circumferential direction of.

At the same time, moving the hose 190 connected to the flaw detection means 100 is made of simultaneous flaw detection in the axial direction of the tube (T).

At this time, the sensing unit 171 integrally with the fixing ring 170 formed at the front end of the head cap 110 is reflected before the rotation of the ultrasonic beam (B) to appear on the screen as a pin signal The counter is then used for the counter of the rotation speed and the estimation of the width of corrosion.

13 is a side sectional view showing main parts of the connecting means 200 according to the present invention.

As shown, the connecting means 200 is fastened to the hose 190 by using the nipple 205 on one side, the lower side to allow the coaxial cable 191 inside the hose 190 to escape, rubber Sealed with a sealing material 201 to prevent water leakage, and the other side is a structure capable of one-touch coupling fastening to insert the inserting portion 204 into the catching portion 203, the supply of industrial water hose 190 To facilitate connection.

14 is a side sectional view showing main parts of the filtration means 300 according to the present invention.

As shown, the filtering means 300 is caught in the ultrasonic beam (B) if there is a foreign matter, scale, etc. contained in the water flowing from the outside causes an abnormal indication value by filtering the incoming water to prevent this In order to remove and at the same time to remove the air and pressure control, the inlet pipe 307 is supplied to the supply water is connected to the inside of the body 301 through the lower cap 309, the inside of the body 301 The filter 302 is configured. The water supplied through the inlet pipe 307 is purified through the filter 302 and supplied to the connecting means 200 through the outlet pipe 306.

In addition, a rod 303 having a head 311 penetrating the upper cap 304 and the lower cap 309 in the center is inserted into the body 301 to fasten the screw 308, and the upper cap 304 ) Is provided with a pressure gauge 305 and a valve 312, so that the pressure can be adjusted.

In other words, since the filter 302 is easily contaminated, it is highly effective to remove foreign substances only by frequent replacement, so that the rod head 311 is fixed to the upper cap 304 by welding to fix the filter. 309 is penetrated and fastened with a fastening screw 308.

Since the incoming water enters the filtering means 300 and exits the outside of the filter, foreign substances are filtered out and the water passing through the filter is supplied to the flaw detection means 100 through a hose connected to the outlet pipe 306 of the lower part.

The body 301 of the filtering means 300 uses stainless steel that is a material that is not damaged or corroded when used in the field.

The filter 302 is located at the center and above the lower springs 311 and the lower caps 304 and 309 in order to fill the gap between the upper and lower caps 304 and 309 and the body 301. As many grooves are processed and assembled without gaps.

Hereinafter, the operation of the present invention configured as described above will be described with reference to the accompanying drawings, Figures 15 and 16a, b.

First, Figure 15 shows the flaw detection range of the flaw detection means 100 according to the present invention,

The corrosion data is collected in the axial direction (b) of the pipe (T) by the circumferential direction (a) scan by the high-speed rotation of the impeller 150 and the movement of the hose 190 connected to the flaw detection means (100).

The data detection rate is obtained as follows.

① Assuming that the outer diameter of the inspection target tube is 25.4 mm, the inner diameter is 19.46 mm, and the thickness is 2.77 mm.

② RPM of impeller 150: 5,200 (86.6 RPM)

③ Pulse Repeat Frequency of Ultrasonic Wave: 6,200Hz (PRF)

④ Moving speed of pipe: 100m / sec

1) Circumferential direction (a) data collection interval

= (RPS πR) / PRF = (86.6 × 19.46 × 3.14) / 6200 = 0.853 mm

100% inspection rate (assuming 1 point is 1mm)

2) Axial (b) data collection interval of pipe

= Travel Speed / RPS = (100mm / sec) /86.6RPS = 1.154

Data detection rate = 1 / 1.154 = 86.6% (data collection point is considered to be 1mm)

As described above, the collection of corrosion data from the inspection target pipe is based on the impeller 150 high-speed rotation and the high pulse repetition frequency of the ultrasonic pulse generator (ultrasonic input / output unit), and the flaw detection means 100 according to the present invention includes an impeller ( This signal is used by realizing the high speed rotation of 150) (more than 5000 RPM) and the ultrasonic generator board which can transmit / receive 10,000 ultrasonic pulses per second.

In addition, the speed of the flaw detection was able to inspect a large amount of tubes at a given time as fast as possible in the field, and 100 mm / sec was standardized. However, when overhaul is required, the speed of screening may be slowed down to 100% data collection rate.

Figures 16a, b is a view showing the principle that the corrosion is measured as a result of the flaw detection by the flaw detection means 100 according to the present invention.

While the longitudinal movement of the flaw detection means 100 and the circumferential rotation of the impeller 150 are simultaneously performed, the ultrasonic beam B moves the inner wall of the tube in the circumferential pitch (a) and the axial pitch (b) in the longitudinal direction. The speed and number of revolutions of the impeller determine the amount of corrosion measurement sampling data.

At this time, the method that is displayed on the display unit 440 of the control means 400 in order to easily see with the naked eye during the inspection, firstly to display the corrosion data collected in the lower part of the voltage (V), the detection unit ( 170, the signal 15-1 is always at a constant height by adjusting the monitoring gate of the sensing unit 170, the corrosion signal 15-2 is the rotational movement of the impeller 150 and the length of the flaw detection means 100 As the directional movement is simultaneously performed, a sine curve is drawn, and the signal 15-2 having the depth of corrosion protrudes as a signal of removing the sine curve.

Corrosion depth on the sine curve is difficult to read depending on the position of the curve, so it is linearized by software to make it easier to read.

Since the measurement of each corrosion depth is difficult to measure with the naked eye, the instrument is memorized in advance by using a pipe similar to the inspection object to memorize the standard of the comparative measurement, and this value and the corrosion value measured by the pipe (T) can be measured by software. Compare and measure and list them as numbers.

As shown in Fig. 16A, if there is no corrosion on the screen, the signal matches the 0 mm (15-3), and if there is corrosion, it appears as the depth 15-4 of the corrosion signal. Before starting the actual thickness test of the pipe (T), display the calculated value (15-5) after checking the design specification in the test information input box, one of the menus of the corrosion data collection program.

That is, 15-3 to 15-5 are the actual thicknesses of the tube T, and 15-3 to 15-4 are the remaining thicknesses. The interval 15-6 between the signal unit 15-1 of the sensor unit 170 and the signal of the sensor unit 170 becomes the inner diameter circumference of the test tube T, and the amount of corrosion data that can be seen on one screen ( 15-1) is set up and adjusted by the Surveyor in software.

The corrosion depth measurement and the straightening method of the sine curve as described above are performed in the program continuously using a mathematical equation.

As described above, the present invention is a heat exchanger, boiler, industrial equipment, etc. consisting of small diameter tube, the diameter of the tube is small, the length is long, investigating and measuring the internal corrosion or damage condition is a matter of time, economic cost, precision Although it was a difficult setup, it was possible to estimate the remaining life of the whole pipe based on the sampling time by the inspection time, improvement of measurement accuracy, and statistical processing of corrosion data. By inspecting the equipment and managing the aging change of corrosion, it is possible to prevent the contamination of products caused by the leakage of pipes, environmental pollution, explosions, etc. by using this device.

In addition, by evaluating the corrosion status of pipes and using the extreme analysis method using reliable test results and statistics, the remaining life can be calculated and provided to the user who owns the facility. It can increase the number of working days, which can be economically effective.

Claims (15)

Investigation means (100) for detecting the degree of corrosion of the inner wall of the tube by using an ultrasonic signal, using the water introduced into the heat exchanger or the tube of a small diameter flowing through the hose, and the supply water to the flaw detection means (100) A connecting means 200 which connects the lakes to each other so as to flow into the connected lake, and at the same time, separates the coaxial cable connected to the flaw detection means 100 from the hose and electrically connects to the control means through the inside of the hose; Filter means 300 to remove the air and foreign substances contained in the supply water supplied to the connecting means and the flaw detection means through a hose, and to control the appropriate water pressure, and the flaw means 100 to signal the ultrasonic beam generated Corrosion degree of the pipe is detected by outputting or receiving the ultrasonic signal again through the flaw detection means 100, and at this time, various Corrosion in the pipes and the remaining service life of the measuring device including a control unit 400 for calculating and, The flaw detection means 100, the locking groove 111 is inserted into the fixing ring at the front end, the screw portion 112 is screwed to the head 120 and the fixing ring is inserted into the locking groove 111 at the rear end Head cap 110 consisting of 170; A plurality of discharge holes 152 through which the water and ultrasonic signals are discharged to the front end in a hollow shape, a reflector 157 mounted inside the discharge hole 152 and refracting the ultrasonic beam at a predetermined angle, and the double bearing 112 ) Is composed of a plurality of small holes 154 formed in the engaging jaw 158 and the intermediate portion 153 and a rotary blade 156 composed of a plurality of spirals at the rear end through the double bearing 112. An impeller 150 supported inside the head cap 110; A probe holder 160 connected to a rear end of the head cap 110 and forming a plurality of spiral protrusions 161 on an outer circumferential surface thereof so that a flow of water flowing from the hose 190 becomes a rapid flow; Hollow type screw parts 121 and 122 provided to be coupled to the head cap 110 and the threaded portion of the center rod 130 at the front and rear ends, the probe holder 160 and the waterproof probe included therein ( A head 120 installed at a front end and a rear end for fixing the head 180, the head 120 including a pair of washers provided with a protrusion 123; A center rod connected to the rear end of the head 120 and connected through a hose nipple 140 connected to a hose 190 and including a coaxial cable 191 for applying an electrical signal to the probe 180 therein. 130; And A plurality of bent grooves are inserted into the outer circumferential surface of the head cap 110, the head 120 and the center rod 130 coupled to the screw, reducing the distance between the tube and the outer diameter of the subject, and formed on the outer circumferential surface to facilitate mobility in the tube. Retaining material 193 including a bulk material 192 of an elastic material inserted into; Corrosion and residual life of the pipe, characterized in that the device. delete The method of claim 1, The head cap 110, the head 120, and the center rod 130 are formed on the incision surface 110a formed by cutting flat at 90 ° intervals on the outer circumference of the hollow shape, and at regular intervals in the axial direction of the outer circumference. Corrosion and residual life of the pipe, characterized in that consisting of one circumferential groove (110b). delete delete delete delete The method of claim 1, The reflector 157 is formed of a reflector 157b formed by cutting one side of a cylindrical shape at an angle of 45 °, and a groove hole 157a having a groove having a predetermined size to reduce weight on the other side. Pipe corrosion and residual life measuring device. The method of claim 1, The fixing ring 170 is a corrosion and residual life measurement device of the tube, characterized in that it comprises a sensing unit 171 formed by bending to the end of the reflector 157 so as to be 90 ° in the direction of winding the ring at one end. The method of claim 1, The fixing ring 170 has a thickness slightly larger than the depth of the locking groove 111 of the head cap 110 to act as a jaw to prevent the detachment of the impeller 150, the corrosion and residual life of the pipe Measuring device. delete delete The method of claim 1, The hose nipple 140 connecting the center rod 130 and the hose 190 has a threaded portion 141 fastened to the center rod 130 and a plurality of hooking portions 143 to connect the hose. Corrosion and residual life of the pipe, characterized in that by forming a connection 142 made to be robust. delete delete