Leak detection and protection device for welding point of energy metering pressure guide pipe

Abstract

The invention relates to a leakage detection and protection device for a welding point of an energy metering pressure guide pipe. The device comprises a semicircular sheath A, a sealing groove A, a sealing groove B, a positioning pin, a semicircular sheath B, a straight-through elbow, a sealing strip, a liquid container and an air pipe, the semicircular sheath A and the semicircular sheath B are welded together to form an integral sheath, the sealing strip is embedded into the sealing groove B of the semicircular sheath A, and the positioning pin is completely inserted into the positioning hole of the semicircular sheath A; a straight-through elbow is fastened in a threaded hole in the surface of the semicircular sheath B, and an air pipe is connected with the straight-through elbow and an air inlet of the liquid container; according to the technical scheme, leakage detection and protection of the welding point of the straight pipe section of the pressure guide pipe are designed for the medium-low pressure metering pressure guide pipe, the situation that leakage of the welding point cannot be found in time is effectively eradicated, the principle that bubbles are generated by blowing leakage detection liquid through gas pressure is specially made, and the aims of close-range observation, timely finding and immediate repairing are achieved; and an accurate energy metering principle is ensured.

Description

Technical Field

[0001] The invention relates to a protective device, in particular to a leakage detection and protective device for welding points of an energy metering pressure-conducting pipe, and belongs to the technical field of metallurgy. Background Art

[0002] Metallurgical enterprises and heavy industrial units are both energy-intensive industries, and also industries with a large number of negative value products. With the improvement of environmental protection requirements in recent years, the compression and tightening of production capacity in high-energy-consuming industries have led to the upgrading of energy use control.

[0003] The energy metering of our company mainly adopts the method of drilling holes on the pipeline of the controlled object to take pressure, welding positive and negative pressure pipes, and then connecting the transmitter to display and control the usage through the settlement instrument. Due to the complexity of the on-site environment and the location of the pipeline, the pressure pipes are mostly connected by welding, which will result in many right-angle and tee welding points. These welding points are exposed to the outdoors for a long time and are affected by environmental factors. They are prone to rust and corrosion, cracking and leakage. The pressure pipes are stretched and contracted under pressure operation, causing cracking and leakage at the welding points. Failure of inaccurate measurement of the controlled object.

[0004] Nowadays, we usually rely on manual work to spray leak detection liquid on the welding points of pressure pipes for leak detection. Since the pressure pipes on site are long, there are many welding points, and they are arranged at high places and in the air, they cannot be reached by manpower alone or there may be omissions, resulting in incomplete leak detection work, and leaks cannot be discovered in time, causing inaccurate measurement of the controlled object.

[0005] Disadvantages of previous leak detection methods:

[0006] 1. Spraying the leak detection liquid on the welding point of the pressure pipe will cause corrosion and rust to the pipe.

[0007] 2. There are many welding points on the pressure pipe, which requires a lot of work and often makes it impossible to conduct a comprehensive leak detection.

[0008] 3. When cracks and leaks occur at the welding points of the pressure pipe, they are silent and cannot be discovered in time.

[0009] 4. Currently, leak detection is done manually and cannot reflect leaks in a timely manner.

[0010] Our unit is in the metallurgical industry, with huge energy consumption. The controlled medium is directly included in the scope of cost control, which directly affects production costs and profits. We have more than 600 metering points, most of which are primary component pressure taking, and the medium pressure signal is transmitted to the transmitter through the pressure pipe to achieve the metering effect. Among them, the pressure pipe, as a conveying equipment, must have good air tightness. However, in practice, the length of the pressure pipe and the on-site installation conditions result in many welded joints. These welded joints will crack and leak over time and under internal and external conditions. The leakage point is not easy to be found in the medium and low pressure range. It will only be found if there is a serious data inaccuracy at the metering point. At this time, it is unknown how much energy has been leaked, and the metering inaccuracy cannot be traced. Therefore, a new solution is urgently needed to solve the above technical problems. Summary of the invention

[0011] The present invention aims at the problems existing in the prior art and provides a leakage detection and protection device for the welding points of energy metering pressure-conducting pipes. The leakage detection and protection device for the welding points of the straight pipe section of the pressure-conducting pipe in this technical solution is designed for medium and low pressure metering pressure-conducting pipes, which effectively prevents leakage at welding points from not being discovered in time. It is tailor-made and uses the principle of blowing bubbles from the leaking liquid with gas pressure to achieve close observation and timely discovery and immediate repair as the goal, thereby ensuring the principle of accurate energy metering.

[0012] In order to achieve the above-mentioned purpose, the technical scheme of the present invention is as follows: a leak detection and protection device for the welding point of an energy metering pressure-conducting pipe, the device comprising a semicircular sheath A, a sealing groove A, a sealing groove B, a locating pin, a semicircular sheath B, a straight elbow, a sealing strip, a liquid container and an air pipe; the semicircular sheath A and the semicircular sheath B are welded together to form an integral sheath, the sealing strip is inserted into the sealing groove B of the semicircular sheath A, and the locating pins are all inserted into the locating holes of the semicircular sheath A; the straight elbow is fastened in the threaded hole on the surface of the semicircular sheath B, and the air pipe connects the straight elbow and the air inlet of the liquid container.

[0013] As an improvement of the present invention, the device also includes a pressure-conducting tube, which is arranged at both ends of the sheath. The center of the semicircular sheath A is aligned with the welding point of the pressure-conducting tube, and the sealing strips at both ends are moved so that they can be embedded in the sealing grooves A at both ends of the semicircular sheath A and adapted.

[0014] As an improvement of the present invention, the installation method is as follows:

[0015] Step 1: Cut two sealing strips of the same length according to the outer diameter of the pressure pipe.

[0016] Step 2: Determine the position of the welding point of the straight section of the pressure pipe, and polish it with sandpaper or a file to ensure that the surface of the sealing position at both ends of the welding point of the pressure pipe is smooth;

[0017] Step 3: Wrap the left and right ends of the welding point with paper, then wrap the two sealing strips around the circumference of the paper, and use adhesive to stick the two sealing strips together to form a sealing ring. Wait for the adhesion to be firm, and rinse the bonded sealing ring with water to ensure that there is no paper scraps and glue;

[0018] Step 4: Insert the sealing strip into the sealing groove B of the semicircular sheath A, cut off the excess parts at both ends, and use adhesive to adhere the sealing strip to the sealing groove B at points. After it is firmly adhered, rinse with water to remove the overflowed and hardened adhesive;

[0019] Step 5: Align the center of the semicircular sheath A with the welding point of the pressure pipe, move the sealing strips at both ends so that they can be embedded in the sealing grooves A at both ends of the semicircular sheath A, and adapt them;

[0020] Step 6: Insert the positioning pins into the countersunk holes of the semicircular sheath A in sequence, and then insert the other end of the positioning pin into the through hole of the semicircular sheath B. At this time, pay attention to the sealing grooves A and B at both ends of the semicircular sheath B, which are put on the corresponding sealing strips of the semicircular sheath A. There is a gap between the semicircular sheath A and the plane of B;

[0021] Step 7: Insert the screws into the connecting holes of the semicircular sheath A and the semicircular sheath B in sequence, and tighten the nuts until the semicircular sheath A and the semicircular sheath B fit together without any gap to form a whole;

[0022] Step 8: Fasten the threaded end of the straight elbow to the threaded hole of the semicircular sheath B.

[0023] Step 9: Connect the two ends of the air pipe to the corrugated part of the straight elbow and the air inlet end of the long pipe of the liquid container. At this point, the leak detection and protection device installation of the pressure pipe welding point are completed.

[0024] Step 10: Pull out the positioning pin, open the liquid container, pour in the leak detection liquid and cover it. If no bubbles are blown out from the air hole of the liquid container during use, it means there is no leakage. If bubbles are blown out from the air hole of the liquid container during use, it proves that there is cracking and sand hole leakage at the welding point.

[0025] A method for leak detection and protection of welding points of energy metering pressure-conducting pipes, the method comprising the following steps:

[0026] Step 1: Install the three-way section, straight pipe section and right-angle section leak detection device at all the welding points of the pressure pipe;

[0027] Step 2: Confirm that there is pressure medium in the pressure pipe;

[0028] Step 3: The air pipe should be as long as possible, and the liquid container should be placed in the transmitter instrument box or in a position that is within human reach for easy observation and operation; Step 3: Confirm that there is pressure medium in the pressure pipe, pour the leak detection liquid into the liquid container in turn, and add according to the scale mark;

[0029] Step 4: The personnel mark the leak detection and protection devices and liquid container installed at the welding point of the pressure pipe, and make sure that the two pieces of the air pipe connection correspond to each other to avoid air pipe connection errors. At this time, the leak detection and protection devices at the welding point of the straight pipe section of the pressure pipe start to work;

[0030] Step 5: During daily inspection, personnel only need to observe the height of the leak detection liquid in the liquid container and whether there are bubbles overflowing from the air outlet of the liquid container to determine whether there are leaks at the corresponding leak detection and protection device installation welding points.

[0031] Compared with the prior art, the present invention has the following advantages: 1. The scheme is easy and reliable to assemble, has a simple structure, flexible disassembly, is easy to use, has a low manufacturing cost, reduces labor intensity, is suitable for use in special spaces, and allows for quick observation and timely reflection; the design of the semicircular sheath A and the semicircular sheath B is convenient for installation at any position of the welding point of the entire pressure pipe; 2. The finished sealing ring cannot be sleeved on the surface of the pressure pipe, and a sealing strip is used to make up for the installation and replacement defects, while preventing the semicircular sheath A and the semicircular sheath B from forming a closed cavity and leaking from both ends of the welding point; 3. The semicircular sheath A and the semicircular sheath B are combined to form a cavity in order to effectively contain the bulging of the welding point and meet the requirements of on-site installation; 4. The sealing groove B prevents the medium in the cavity from leaking from the matching gap between the semicircular sheath A and the semicircular sheath B, resulting in insufficient pressure in the liquid container, inability to form bubbles, and immediate leak detection failure; 5. The threaded right-angle elbow is connected to meet more Replacement and angle adjustment; 6. PVC transparent hose is used as the material of the air pipe, which is low in cost and easy to replace; 7. The pressure pipe is exposed to the atmosphere for a long time, and is often eroded by the leaking liquid and cracks appear. The semicircular sheath A and the semicircular sheath B are combined into a protective armor to effectively prevent external destructive factors; 8. The liquid container is made of transparent plastic and has a scale for easy observation and addition. It is placed at a low and reachable position; 9. The semicircular sheath A and the semicircular sheath B are preferably made of stainless steel, or nylon, but a clamping piece must be added; 10. This design is always installed at the welding point position, and by observing the liquid level and bubbles in the liquid container, the effect of leak detection and low-level observation can be achieved at all times; 11. Bubbles appear in the liquid container, indicating leakage. You only need to open the semicircular sheath A and the semicircular sheath B for inspection and easy disassembly; 12. At the same time, leak detection and protection devices are designed for the three-way welding point and the right-angle welding point to perfectly control the status of the welding point of the entire pressure pipe. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Figure 1 This is a schematic diagram of parts for leak detection and protection of welding points of straight pipe sections of pressure pipes;

[0033] Figure 2 This is a schematic diagram of the assembly of leak detection and protection for the welding points of the straight section of the pressure pipe;

[0034] Figure 3This is a schematic diagram of on-site use of leak detection and protection at the welding points of the straight section of the pressure pipe;

[0035] Figure 4 This is a schematic diagram of leak detection and protection for the welding points of the right-angle section of the pressure pipe;

[0036] Figure 5 This is a schematic diagram of leak detection and protection at the welding point of the three-way section of the pressure pipe.

[0037] In the figure: 1- nut 2- semicircular sheath A 3- through hole 4- countersunk hole 5- sealing groove A 6- cavity 7- sealing groove B 8- screw 9- positioning pin 10- threaded through hole 11- semicircular sheath B 12- straight elbow 13- liquid container 14- sealing strip 15- air pipe 16- pressure pipe. DETAILED DESCRIPTION

[0038] In order to deepen the understanding of the present invention, the present embodiment is described in detail below with reference to the accompanying drawings.

[0039] Example 1: See Figure 1 — Figure 5 , a leak detection and protection device for welding points of energy metering pressure pipe, the device comprises a semicircular sheath A2, a sealing groove A5, a sealing groove B7, a positioning pin 9, a semicircular sheath B11, a straight elbow 12, a sealing strip 14, a liquid container 13 and an air pipe 15; the semicircular sheath A2 and the semicircular sheath B11 are welded together to form an integral sheath, the sealing strip 14 is inserted into the sealing groove B of the semicircular sheath A, and the positioning pins 9 are all inserted into the positioning holes of the semicircular sheath A; the straight elbow 12 is fastened in the threaded hole on the surface of the semicircular sheath B11, and the air pipe 15 connects the straight elbow 12 with the air inlet of the liquid container, the device also comprises a pressure pipe 16, the pressure pipe 16 is arranged at both ends of the sheath, the center of the semicircular sheath A2 is aligned with the welding point of the pressure pipe, and the sealing strips at both ends are moved so that it can be embedded in the sealing grooves A at both ends of the semicircular sheath A, and adapted. The device includes a welding point where the pressure pipe is butted, which is completely wrapped with two semicircular sheaths, and a sealing strip is installed, so that the welding point is in a closed space, effectively preventing atmospheric corrosive substances from corroding the welding interface. The two semicircular sheaths are fastened to the external position of the pressure pipe welding point, which also improves the strength of the welding and effectively protects the striking ability of the welding point.

[0040] The installation method is as follows:

[0041] Step 1: Cut two sealing strips of the same length according to the outer diameter of the pressure pipe.

[0042] Step 2: Determine the position of the welding point of the straight section of the pressure pipe, and polish it with sandpaper or a file to ensure that the surface of the sealing position at both ends of the welding point of the pressure pipe is smooth;

[0043] Step 3: Wrap the left and right ends of the welding point with paper, then wrap the two sealing strips around the circumference of the paper, and use adhesive to stick the two sealing strips together to form a sealing ring. Wait for the adhesion to be firm, and rinse the bonded sealing ring with water to ensure that there is no paper scraps and glue;

[0044] Step 4: Insert the sealing strip into the sealing groove B of the semicircular sheath A, cut off the excess parts at both ends, and use adhesive to adhere the sealing strip to the sealing groove B at points. After it is firmly adhered, rinse with water to remove the overflowed and hardened adhesive;

[0045] Step 5: Align the center of the semicircular sheath A with the welding point of the pressure pipe, move the sealing strips at both ends so that they can be embedded in the sealing grooves A at both ends of the semicircular sheath A, and adapt them;

[0046] Step 6: Insert the positioning pins into the countersunk holes of the semicircular sheath A in sequence, and then insert the other end of the positioning pin into the through hole of the semicircular sheath B. At this time, pay attention to the sealing grooves A and B at both ends of the semicircular sheath B, which are put on the corresponding sealing strips of the semicircular sheath A. There is a gap between the semicircular sheath A and the plane of B;

[0047] Step 7: Insert the screws into the connecting holes of the semicircular sheath A and the semicircular sheath B in sequence, and tighten the nuts until the semicircular sheath A and the semicircular sheath B fit together without any gap to form a whole;

[0048] Step 8: Fasten the threaded end of the straight elbow to the threaded hole of the semicircular sheath B.

[0049] Step 9: Connect the two ends of the air pipe to the corrugated part of the straight elbow and the air inlet end of the long pipe of the liquid container. At this point, the leak detection and protection device installation of the pressure pipe welding point are completed.

[0050] Step 10: Pull out the positioning pin, open the liquid container, pour in the leak detection liquid and cover it. If no bubbles are blown out from the air hole of the liquid container during use, it means there is no leakage. If bubbles are blown out from the air hole of the liquid container during use, it proves that there is cracking and sand hole leakage at the welding point.

[0051] 2. Disassembly method:

[0052] 1. Pull out the air pipe connected to the straight elbow and remove the air pipe and liquid container.

[0053] 2. Remove the screws and nuts, insert two beveled positioning pins, tap the positioning pins with a tool to separate and remove the semicircular sheath A and semicircular sheath B, and then take out the positioning pins.

[0054] 3. Remove the sealing strip of semicircular sheath A (scrap) and the sealing rings at both ends of the welding point (scrap). Use fine sandpaper to remove impurities on the surface of semicircular sheath A and semicircular sheath B, and remove the adhesive in the grooves of sealing groove A and sealing groove B.

[0055] 4. At this point, the leak inspection and protective device removal of the pressure pipe welding point have been completed.

[0056] Example 2: See Figure 1 — Figure 5 , a method for leak detection and protection of energy metering pressure pipe welding points, the method comprising the following steps:

[0057] Step 1: Install the three-way section, straight pipe section and right-angle section leak detection device at all the welding points of the pressure pipe;

[0058] Step 2: Confirm that there is pressure medium in the pressure pipe;

[0059] Step 3: The air pipe should be as long as possible, and the liquid container should be placed in the transmitter instrument box or in a position that is within human reach for easy observation and operation; Step 3: Confirm that there is pressure medium in the pressure pipe, pour the leak detection liquid into the liquid container in turn, and add according to the scale mark;

[0060] Step 4: The personnel mark the leak detection and protection devices and liquid container installed at the welding point of the pressure pipe, and make sure that the two pieces of the air pipe connection correspond to each other to avoid air pipe connection errors. At this time, the leak detection and protection devices at the welding point of the straight pipe section of the pressure pipe start to work;

[0061] Step 5: During daily inspection, personnel only need to observe the height of the leak detection liquid in the liquid container and whether there are bubbles overflowing from the air outlet of the liquid container to determine whether there are leaks at the corresponding leak detection and protection device installation welding points.

[0062] In the above scheme, two pieces of semicircular sheaths are combined to form a protective armor, which improves the deformation resistance of the pressure pipe welding position, prevents cracking caused by external factors, and plays a protective role. The two pieces of semicircular sheaths are sealed inside to form a closed space in the internal cavity. If cracks and leaks occur at the welding point, they are directly transmitted to the liquid container by the air pipe in the closed space, causing bubbles to appear in the leak detection liquid, thereby finding the leak point and repairing it in time. There are many welding points in the pressure pipe, and the workload of leak detection is usually large. It is even impossible to detect leaks at high altitudes and special locations. As long as this pressure pipe welding point leak detection and protection device is installed at the welding position, it can be checked at any time at a position accessible on the ground, without frequent high-altitude operations to avoid omissions. It is difficult to find leaks at the welding points of medium and low pressure medium pressure pipes because the noise is loud in the factory area and cannot be found by hearing. Directly spraying leak detection liquid is not very effective, and there are major hidden dangers to personnel safety. This scheme effectively controls energy media with large consumption and many disputes, suitable for micro differential pressure measurement, and reduces safety risks. This device wraps the welding point to form a closed air chamber and introduces a series of measures such as leak detection liquid through the air pipe. The welding point is leak-checked at all times, and the bubbles in the liquid container are checked at a low position to provide feedback on the working status effect at all times, thus getting rid of the shortcomings of manual leak detection. This solution not only designs leak detection and protection for the straight welding points of the pressure pipe, but also designs leak detection and protection devices for the three-way welding points and right-angle welding points, making up for the missing control of the bending and bypass pressure guide. The parts are the same, the installation and disassembly methods are the same, and the operation methods are the same. For details, see the attached Figure 4 , Attachment Figure 5 .

[0063] It should be noted that the above embodiments are not intended to limit the protection scope of the present invention, and equivalent changes or substitutions made on the basis of the above technical solutions all fall within the protection scope of the claims of the present invention.

Claims

1. A leak detection and protection device for welding points of energy metering pressure pipes, characterized in that: The device comprises a semicircular sheath A (2), a sealing groove A (5), a sealing groove B (7), a positioning pin (9), a semicircular sheath B (11), a straight elbow (12), a sealing strip (14), a liquid container (13) and an air pipe (15); the semicircular sheath A (2) and the semicircular sheath B (11) are welded together to form an integral sheath, the sealing strip (14) is inserted into the sealing groove B of the semicircular sheath A, and the positioning pin (9) is completely inserted into the positioning hole of the semicircular sheath A; the straight elbow (12) is fastened to the threaded hole on the surface of the semicircular sheath B (11), and the air pipe (15) connects the straight elbow (12) and the air inlet of the liquid container.

2. The energy metering pressure pipe welding point leak detection and protection device according to claim 1 is characterized in that: The device also includes a pressure-conducting tube (16) which is arranged at both ends of the sheath. The center of the semicircular sheath A (2) is aligned with the welding point of the pressure-conducting tube, and the sealing strips at both ends are moved so that they can be embedded in the sealing grooves A at both ends of the semicircular sheath A and adapted.

3. The energy metering pressure pipe welding point leak detection and protection device according to claim 1 is characterized in that: The installation method is as follows: Step 1: Cut two sealing strips of the same length according to the outer diameter of the pressure pipe. Step 2: Determine the position of the welding point of the straight section of the pressure pipe, and polish it with sandpaper or a file to ensure that the surface of the sealing position at both ends of the welding point of the pressure pipe is smooth; Step 3: Wrap the left and right ends of the welding point with paper, then wrap the two sealing strips around the circumference of the paper, and use adhesive to stick the two sealing strips together to form a sealing ring. Wait for the adhesion to be firm, and rinse the bonded sealing ring with water to ensure that there is no paper scraps and glue; Step 4: Insert the sealing strip into the sealing groove B of the semicircular sheath A, cut off the excess parts at both ends, and use adhesive to adhere the sealing strip to the sealing groove B at points. After it is firmly adhered, rinse with water to remove the overflowed and hardened adhesive; Step 5: Align the center of the semicircular sheath A with the welding point of the pressure pipe, move the sealing strips at both ends so that they can be embedded in the sealing grooves A at both ends of the semicircular sheath A, and adapt them; Step 6: Insert the positioning pins into the countersunk holes of the semicircular sheath A in sequence, and then insert the other end of the positioning pin into the through hole of the semicircular sheath B. At this time, pay attention to the sealing grooves A and B at both ends of the semicircular sheath B, which are put on the corresponding sealing strips of the semicircular sheath A. There is a gap between the semicircular sheath A and the plane of B; Step 7: Insert the screws into the connecting holes of the semicircular sheath A and the semicircular sheath B in sequence, and tighten the nuts until the semicircular sheath A and the semicircular sheath B fit together without any gap to form a whole; Step 8: Fasten the threaded end of the straight elbow to the threaded hole of the semicircular sheath B. Step 9: Connect the two ends of the air pipe to the corrugated part of the straight elbow and the air inlet end of the long pipe of the liquid container. At this point, the leak detection and protection device installation of the pressure pipe welding point are completed. Step 10: Pull out the positioning pin, open the liquid container, pour in the leak detection liquid and cover it. If no bubbles are blown out from the air hole of the liquid container during use, it means there is no leakage. If bubbles are blown out from the air hole of the liquid container during use, it proves that there is cracking and sand hole leakage at the welding point.

4. A method for leak detection and protection of welding points of energy metering pressure pipes, characterized in that: Using the device described in claim 1 or 2, the method comprises the following steps: Step 1: Install the three-way section, straight pipe section and right-angle section leak detection device at all the welding points of the pressure pipe; Step 2: Confirm that there is pressure medium in the pressure pipe; Step 3: The air pipe should be as long as possible, and the liquid container should be placed in the transmitter instrument box or in a position that is within human reach and convenient for observation and operation; Step 3: Confirm that there is pressure medium in the pressure pipe, pour the leak detection liquid into the liquid container in turn, and add according to the scale mark; Step 4: The personnel mark the leak detection and protection devices and liquid container installed at the welding point of the pressure pipe, and make sure that the two pieces of the air pipe connection correspond to each other to avoid air pipe connection errors. At this time, the leak detection and protection devices at the welding point of the straight pipe section of the pressure pipe start to work; Step 5: During daily inspection, personnel only need to observe the height of the leak detection liquid in the liquid container and whether there are bubbles overflowing from the air outlet of the liquid container to determine whether there are leaks at the corresponding leak detection and protection device installation welding points.

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