A precision calibration device and calibration method

Abstract

The application discloses a precision checking device, which is established based on a checking platform, a checking system and auxiliary equipment. The checking platform is used for fixing the checking system and the auxiliary equipment. In the checking system, the experimental pipe b is sealed, then is pressed by a pressure pump in stages, and the precision of checking measurement is compared in the mode of the pressure gauge and the pressure transmitter value of test point b; the experimental pipe b is deformed by a jack, and the precision of checking measurement is compared in the mode of the dial gauge and the vibrating wire stress meter value of test point c; the experimental pipe b is measured by ultrasonic wall thickness monitoring equipment, and the precision of checking measurement is compared in the mode of the measured data and the real wall thickness. The checking device and the checking method can simply and conveniently check and calibrate oil and gas pipeline leakage monitoring and early warning equipment such as a pressure transmitter, a vibrating wire stress meter, ultrasonic wall thickness monitoring equipment and the like, and provide convenience for on-site equipment installation and maintenance.

Description

Technical Field

[0001] This invention belongs to the field of oil and gas pipeline leakage monitoring and early warning technology, specifically relating to an accuracy verification device and an accuracy verification method. Background Technology

[0002] To effectively reduce or prevent pipeline leakage accidents, various oil and gas pipeline leakage monitoring devices are installed at important oil and gas pipeline locations, including pressure transmitters, vibrating wire stress gauges, and ultrasonic wall thickness monitoring equipment. However, during installation or maintenance, it is necessary to verify whether the pipeline leakage monitoring equipment can work properly and whether the measurements are accurate, and calibration work is also required. In most cases, there are no conditions for verification and calibration on site, or verification and calibration can only be carried out after installation, which often leads to rework, seriously affecting the project schedule, and also poses huge hidden dangers. Summary of the Invention

[0003] The purpose of this invention is to provide an accuracy verification device that solves the problem that pressure transmitters, vibrating wire stress gauges, and ultrasonic wall thickness monitoring equipment cannot be verified and calibrated on-site in existing pipeline leakage monitoring equipment.

[0004] Another objective of this invention is to provide a method for accuracy verification.

[0005] The first technical solution adopted in this invention is: a precision verification device, comprising...

[0006] Verification platform: The verification platform is used to fix the verification system and auxiliary equipment;

[0007] Calibration System: The calibration system is used to verify the measurement accuracy of pressure transmitters, vibrating wire stress gauges, and ultrasonic wall thickness monitoring equipment.

[0008] Auxiliary equipment is used to assist the calibration system in verifying the measurement accuracy of pressure transmitters and vibrating wire stress gauges.

[0009] The calibration platform includes a rectangular frame base, on which the calibration system is fixed.

[0010] The invention is further characterized in that,

[0011] The base is equipped with diagonal supports at each corner.

[0012] The calibration system includes an experimental tube b fixed along the length of the base. A jack is installed below the center of the experimental tube b and fixed on the jack base. The jack supports the experimental tube b. Experimental tube a and valve b are connected to both ends of the experimental tube b through pipe fittings. Valve a is also connected between experimental tube a and experimental tube b. Valve b is used to seal the experimental tube b. A pressure pump is connected to the end of the experimental tube b near valve b through a pressure pumping line. A pressure pumping valve is also installed on the pressure pumping line. The pressure pump is used to pressurize the experimental tube b.

[0013] Experimental tube b is fixed to the base by a U-shaped clip.

[0014] Test point c is set at the center of test tube b; a dial indicator is set on the base, which is used to measure the deformation or displacement of test tube b at test point c.

[0015] Test points a8 are set at four positions on the outer side of the experimental tube a, namely, the top, bottom, left, and right. Test points a8 are cylinders welded to the experimental tube a, with a thickness of 5 mm at the top, 10 mm at the left, 20 mm at the right, and 20 mm at the bottom (all thicknesses include the thickness of the experimental tube a). They are used to accurately locate the measurement position of the ultrasonic wall thickness monitoring equipment.

[0016] Near one end of the test tube b, a small pipe is welded to it. The small pipe is used to install the pressure transmitter to be calibrated or to inject liquid into the test tube b. The opening of the small pipe serves as the test point b.

[0017] A branch valve is also installed on the experimental tube b. The branch valve is connected to the top of the experimental tube b and is horizontally spaced mm from the test point b. A pressure gauge is installed on the top of the branch valve. The branch valve is used to seal the experimental tube b and also to control the working status of the pressure gauge.

[0018] The second technical solution adopted in this invention is a precision verification method, the specific operation steps of which are as follows:

[0019] This includes the accuracy calibration of pressure transmitters, vibrating wire stress gauges, and ultrasonic wall thickness monitoring equipment.

[0020] The calibration of the measurement accuracy of a pressure transmitter includes the following steps:

[0021] Step 1: Close valves a, b, and the pressure valve. Fill the test pipe b with water through test point b. Install the pressure transmitter to be tested above test point b and ensure that the pressure transmitter can receive remote data normally.

[0022] Step 2: Open the branch valve and the pressure valve, and pressurize the pump step by step. Read the pressure from the pressure gauge, the pressure transmitter being measured, and the remote data pressure respectively.

[0023] Step 3: Compare the pressure gauge, the pressure transmitter under test, and the remote data pressure under different pressures to verify and calculate the measurement accuracy of the pressure transmitter under test.

[0024] The specific method for verifying the measurement accuracy of a vibrating wire stress gauge is as follows:

[0025] Step 1: Install the vibrating wire stress gauge to be tested at test point c, and also measure the pointer of the dial indicator at test point c;

[0026] Step 2: Apply pressure to the jack to deform the experimental tube b, and read the dial gauge and the stress count value of the vibrating wire being tested;

[0027] Step 3: Compare the dial gauge and the measured vibrating wire stress count values ​​under different deformations to verify and calculate the measurement accuracy of the measured vibrating wire stress gauge.

[0028] The specific method for verifying the measurement accuracy of ultrasonic wall thickness monitoring equipment is as follows:

[0029] Step 1: Use the probe of the ultrasonic wall thickness monitoring device to measure the thickness at test point a in the top, bottom, left and right directions, and read the wall thickness reading of the ultrasonic wall thickness monitoring device.

[0030] Step 2: Grind or weld the area below test point a, and simultaneously measure the area below test point a using the ultrasonic wall thickness monitoring device and ultrasonic thickness gauge.

[0031] Step 3: Compare the readings of the ultrasonic wall thickness monitoring device with the actual wall thickness to verify and calculate the measurement accuracy of the ultrasonic wall thickness monitoring device.

[0032] The beneficial effects of this invention are as follows: This invention establishes a calibration device based on a calibration platform, a calibration system, and auxiliary equipment. The calibration platform is used to fix the calibration system and auxiliary equipment. In the calibration system, test tube b is sealed, and then pressurized step-by-step by a pressure pump. The measurement accuracy is verified by comparing the pressure gauge and pressure transmitter values ​​at test point b. Test tube II is deformed using a jack, and the measurement accuracy is verified by comparing the dial gauge and vibrating wire stress gauge values ​​at test point c. The measurement accuracy is verified by measuring test point a using an ultrasonic wall thickness monitoring device and comparing the measured data with the actual wall thickness. This calibration device and method can easily and conveniently calibrate and verify oil and gas pipeline leak monitoring and early warning equipment (pressure transmitter, vibrating wire stress gauge, ultrasonic wall thickness monitoring device), providing convenience for on-site equipment installation and maintenance. Attached Figure Description

[0033] Figure 1 This is a perspective view of a precision verification device according to the present invention;

[0034] Figure 2 This is a front view of a precision verification device according to the present invention.

[0035] Figure 3 This is a side view of a precision verification device according to the present invention.

[0036] In the diagram: 1. Base; 2. Diagonal support; 3. U-shaped clamp; 4. Jack base; 5. Jack; 6. Pressure gauge; 7. Test tube a; 8. Test point a; 9. Valve a; 10. Test point b; 11. Dial gauge; 12. Branch valve; 13. Test point c; 14. Test tube b; 15. Valve b; 16. Pressure valve; 17. Pressure pump; 18. Balance pad. Detailed Implementation

[0037] The present invention provides a precision verification device, such as... Figure 1-3 As shown, a calibration device is established based on a calibration platform, a calibration system, and auxiliary equipment. The calibration platform is used to fix the calibration system and auxiliary equipment. In the calibration system, test tube b is sealed, and then pressurized step-by-step by a pressure pump. The measurement accuracy is verified by comparing the pressure gauge and pressure transmitter values ​​at test point b. The test tube b is deformed using a jack, and the measurement accuracy is verified by comparing the dial gauge and vibrating wire stress count values ​​at test point c. Finally, the measurement accuracy is verified by measuring test point a using an ultrasonic wall thickness monitoring device and comparing the measured data with the actual wall thickness.

[0038] The calibration platform includes a rectangular frame base 1, with a balancing pad 18 at the bottom of the base 1. The base 1 is used to fix the calibration system and auxiliary equipment.

[0039] The calibration system includes test pipe a7, test point a8, valve a9, test point b10, branch valve 12, pressure gauge 6, test point c13, test pipe b14, valve b15, and pressure testing valve 16. The calibration system is used to verify the measurement accuracy of pressure transmitters, vibrating wire stress gauges, and ultrasonic wall thickness monitoring equipment.

[0040] The auxiliary equipment includes a jack 5, a dial indicator 11, and a pressure pump 17. The auxiliary equipment is used to assist the calibration system in calibrating the measurement accuracy of the pressure transmitter and the vibrating wire stress gauge.

[0041] There are 4 balance pads (18 in total) located at the bottom of the four corners of the base to stabilize the base platform.

[0042] The base 1 is a rectangular frame structure consisting of steel beams and a steel plate at the bottom. The base is used to support the calibration platform and the jack base 4.

[0043] There are two U-shaped cards 3, and each U-shaped card contains four nuts. The U-shaped cards 3 are connected to the base 1 through the nuts to fix the experimental tube b14 of the calibration system.

[0044] Jack base 4 is placed in the center of base 1 to support jack 5.

[0045] Jack 5 is placed directly above the center of jack base 4 and is used to compress experimental tube b14, causing experimental tube b14 to deform.

[0046] Dial gauge 11 is used to measure the deformation or displacement of test tube b14.

[0047] Experimental tube a7, a DN80 steel pipe, is connected to valve a9 and is used to verify the measurement accuracy of the ultrasonic wall thickness monitoring equipment.

[0048] Test point a8 is a solid cylinder, and there are 4 of them. They are distributed on the outside of the test tube a at four positions: top, bottom, left, and right. The thickness of the test point at the top position is 5 mm, the thickness of the test point at the left position is 10 mm, the thickness of the test point at the right position is 20 mm, and the thickness of the test point at the bottom position is 20 mm. Test point a8 is used to accurately locate the measurement position of the ultrasonic wall thickness monitoring equipment.

[0049] Valve a, with specification PN100, connects test tube a7 and test tube b14, and is used to seal test tube b, providing a sealed environment for calibrating the pressure sensor.

[0050] Test point b10, a small pipe with a specification of PN100, is welded to the upper right side of test pipe b14 and connected to test pipe b14. It is used to install the pressure transmitter to be calibrated, and can also be used to inject liquid into test pipe b14.

[0051] Branch valve 12, with specification PN100, is connected above the test tube b14 and is 100mm horizontally spaced from the test point b10 to prevent collision with the pressure transmitter being calibrated. Pressure gauge 6 is installed on the upper part to seal the test tube b14 and to control the working status of pressure gauge 6.

[0052] Pressure gauge 6 is installed above branch valve 12 and is used to verify the actual pressure inside test tube b14.

[0053] Test point c13 is located directly above the center of test tube b14 and is used to accurately locate the verification position of the deformation of test tube b14.

[0054] Test tube B14, DN80, PN100 steel pipe, is used to provide a calibration platform for the calibration of pressure transmitters and vibrating wire stress gauges.

[0055] Valve b15, specification PN100, connects to test tube b14 and is used to seal test tube b14, providing a sealed environment for calibrating the pressure sensor.

[0056] Pressure valve 16, specification PN100, is installed on the pressure testing line to seal test tube b14, providing a sealed environment for calibrating the pressure sensor, and also to drain the liquid in test tube b14.

[0057] Pressure pump 17 is used to pressurize experimental tube b14.

[0058] The present invention verifies the measurement accuracy of a pressure transmitter by comprising the following steps:

[0059] Step 1: Close valves a9, b15, and pressure valve 16. Fill test pipe b14 with water through test point b10. Install the pressure transmitter under test above test point b10 and ensure that the pressure transmitter can receive remote data normally.

[0060] Step 2: Open branch valve 12 and pressure valve 16, and pressurize the pump step by step. Read the pressure from pressure gauge 6, the pressure transmitter under test, and the remote data pressure respectively.

[0061] Step 3: Compare the pressure gauge 6, the pressure transmitter under test, and the remote data pressure under different pressures to verify and calculate the measurement accuracy of the pressure transmitter under test.

[0062] The specific method for verifying the measurement accuracy of ultrasonic wall thickness monitoring equipment is as follows:

[0063] The present invention verifies the measurement accuracy of a vibrating wire stress gauge by comprising the following steps:

[0064] Step 1: Install the vibrating wire stress gauge to be tested at test point c13, and also measure the pointer of dial indicator 11 at test point c13;

[0065] Step 2: Apply pressure to the jack to deform the experimental tube b14, and read the values ​​of the dial gauge 11 and the stress count of the vibrating wire under test.

[0066] Step 3: Compare the values ​​of the dial gauge 11 and the measured vibrating wire stress count under different deformations to verify and calculate the measurement accuracy of the measured vibrating wire stress gauge.

[0067] The present invention verifies the measurement accuracy of an ultrasonic wall thickness monitoring device by comprising the following steps:

[0068] Step 1: Use the probe of the ultrasonic wall thickness monitoring device to measure the thickness at test point a8 on the top, bottom, left and right sides, and read the wall thickness reading of the ultrasonic wall thickness monitoring device.

[0069] Step 2: Grind or weld the area below test point a8, and simultaneously measure the area below test point a8 using the ultrasonic wall thickness monitoring device and ultrasonic thickness gauge.

[0070] Step 3: Compare the readings of the ultrasonic wall thickness monitoring device with the actual wall thickness to verify and calculate the measurement accuracy of the ultrasonic wall thickness monitoring device.

[0071] Example 1: (Verification of the measurement accuracy of a pressure transmitter)

[0072] like Figure 1 As shown, after installing the device, close valves a, b, and the pressure-pressurizing valve. Fill test pipe b with water through test point b. Install the pressure transmitter under test above test point b, ensuring normal remote data reception. Open the branch pipe valve and the pressure-pressurizing valve, and pressurize the pump step by step, reading the pressure gauge readings, the pressure transmitter readings, and the remote data pressure. Compare the pressure gauge readings, the pressure transmitter readings, and the remote data pressures under different pressures to verify and calculate the measurement accuracy of the pressure transmitter under test.

[0073] Example 2: (Verification of the measurement accuracy of a plate stress transmitter)

[0074] like Figure 1 As shown, after installing the device, the vibrating wire stress gauge to be tested is installed at test point c, and the dial indicator pointer also measures the test point c. Pressure is applied to the jack to cause deformation of the test tube II, and the dial indicator and the measured vibrating wire stress count values ​​are read. The dial indicator and the measured vibrating wire stress count values ​​under different deformations are compared to verify and calculate the measurement accuracy of the vibrating wire stress gauge.

[0075] Example 3: (Verification of the measurement accuracy of ultrasonic wall thickness monitoring equipment)

[0076] like Figure 1 As shown, after installing the device, the probe of the ultrasonic wall thickness monitoring equipment will measure the thickness at test point a from the top, bottom, left, and right, and read the wall thickness readings from the ultrasonic wall thickness monitoring equipment. Grind or weld the area below test point a, and simultaneously measure the area below test point a using both the ultrasonic wall thickness monitoring equipment and an ultrasonic thickness gauge. Compare the readings of the ultrasonic wall thickness monitoring equipment with the actual wall thickness to verify and calculate the measurement accuracy of the ultrasonic wall thickness monitoring equipment.

[0077] Example 4:

[0078] The present invention provides a precision calibration device, including a calibration platform, including a rectangular frame base 1, with a balancing pad at the bottom of the base 1, and the base 1 is used to fix the calibration system and auxiliary equipment.

[0079] The calibration system includes test pipe a7, test point a8, valve a9, test point b10, branch valve 12, pressure gauge 6, test point c13, test pipe b14, valve b15, and pressure testing valve 16. The calibration system is used to verify the measurement accuracy of pressure transmitters, vibrating wire stress gauges, and ultrasonic wall thickness monitoring equipment.

[0080] The auxiliary equipment includes a jack 5, a dial indicator 11, and a pressure pump 17. The auxiliary equipment is used to assist the calibration system in calibrating the measurement accuracy of the pressure transmitter and the vibrating wire stress gauge.

[0081] The base 1 is a rectangular frame structure consisting of steel beams and a steel plate at the bottom. The base is used to support the calibration platform and the jack base 4.

[0082] There are two U-shaped cards 3, and each U-shaped card contains four nuts. The U-shaped cards 3 are connected to the base 1 through the nuts to fix the experimental tube b14 of the calibration system.

[0083] Jack base 4 is placed in the center of base 1 to support jack 5.

[0084] Jack 5 is placed directly above the center of jack base 4 and is used to compress experimental tube b14, causing experimental tube b14 to deform.

[0085] Dial gauge 11 is used to measure the deformation or displacement of test tube 141.

[0086] Experimental tube a7, a DN80 steel pipe, is connected to valve a9 and is used to verify the measurement accuracy of the ultrasonic wall thickness monitoring equipment.

[0087] There are four test points a8, distributed on the outside of the experimental tube a at four positions: top, bottom, left, and right. The thickness of the top position is 5 mm, the thickness of the left position is 10 mm, the thickness of the right position is 20 mm, and the thickness of the bottom position is 20 mm. These points are used to accurately locate the measurement position of the ultrasonic wall thickness monitoring equipment.

Claims

1. An accuracy verification device, characterized by, include Verification platform: The verification platform is used to fix the verification system and auxiliary equipment; Calibration system: The calibration system is used to calibrate the measurement accuracy of pressure transmitters, vibrating wire stress gauges, and ultrasonic wall thickness monitoring equipment; The auxiliary equipment is used to assist the calibration system in verifying the measurement accuracy of the pressure transmitter and the vibrating wire stress gauge; The verification platform includes a rectangular frame base (1), and the verification system is fixed on the base (1); The verification system includes an experimental tube b (14) fixed along the length of the base (1). A jack (5) is set below the center of the experimental tube b (14). The jack (5) is fixed on the jack base (4) and is used to support the experimental tube b (14). The two ends of the experimental tube b (14) are respectively connected to an experimental tube a (7) and a valve b (15) through pipe joints. A valve a (9) is also connected between the experimental tube a (7) and the experimental tube b (14). The valve b (15) is used to seal the experimental tube b (14). A pressure pump (17) is connected to one end of the experimental tube b (14) near the valve b (15) through a pressure pump line. A pressure valve (16) is also set on the pressure pump line. The pressure pump (17) is used to pressurize the experimental tube b (14). The experimental tube b (14) has a test point c (13) at its center; a dial indicator (11) is provided on the base (1), and the dial indicator (11) is used to measure the deformation or displacement of the experimental tube b (14) at the test point c (13). The experimental tube a (7) has four corresponding test points a (8) set on the outer side, at the top, bottom, left and right. The test points a (8) are solid cylinders welded to the experimental tube a (7). The thickness of the upper position is 5 mm, the thickness of the left position is 10 mm, the thickness of the right position is 20 mm, and the thickness of the lower position is 20 mm. They are used to accurately locate the measurement position of the ultrasonic wall thickness monitoring equipment. The test points a (8) are used to accurately locate the measurement position of the ultrasonic wall thickness monitoring equipment. A small pipe is also welded to one end near the test tube b (14). The small pipe is used to install the pressure transmitter to be tested or to inject liquid into the test tube b (14). The opening of the small pipe is used as the test point b (10).

2. The precision verification device of claim 1, wherein, The base (1) is provided with diagonal supports (2) at each corner.

3. The precision verification device of claim 1, wherein, The experimental tube b (14) is fixed to the base (1) by a U-shaped clip (3).

4. The precision verification device of claim 3, wherein, A branch valve (12) is also provided on the experimental tube b (14). The branch valve (12) is connected to the top of the experimental tube b (14) and is 100mm away from the test point b (10) at a horizontal distance. A pressure gauge (6) is installed on the top of the branch valve (12). The branch valve (12) is used to seal the experimental tube b (14) and also to control the working state of the pressure gauge (6).

5. A precision verification method, characterized by, The specific operation steps of the accuracy verification device according to any one of claims 1-4 are as follows: This includes the accuracy calibration of pressure transmitters, vibrating wire stress gauges, and ultrasonic wall thickness monitoring equipment. The calibration of the measurement accuracy of a pressure transmitter includes the following steps: Step 1: Close valve a (9), valve b (15), and pressure valve (16). Fill test pipe b (14) with water through test point b (10). Install the pressure transmitter to be tested above test point b (10) and ensure that the pressure transmitter can receive remote data normally. Step 2: Open the branch valve (12) and the pressure valve (16), and pressurize the pressure pump step by step. Read the pressure gauge (6), the pressure transmitter under test, and the remote data pressure respectively. Step 3: Compare the pressure gauge (6), the pressure transmitter under test, and the remote data pressure under different pressures to verify and calculate the measurement accuracy of the pressure transmitter under test. The specific method for verifying the measurement accuracy of a vibrating wire stress gauge is as follows: Step 1: Install the vibrating wire stress gauge to be tested on test point c (13), and also measure the pointer of the dial gauge (11) at test point c (13). Step 2: Apply pressure to the jack to deform the experimental tube b (14), and read the dial gauge (11) and the stress count value of the vibrating wire under test; Step 3: Compare the dial gauge (11) and the measured vibrating wire stress count value under different deformations to verify and calculate the measurement accuracy of the measured vibrating wire stress gauge; The specific method for verifying the measurement accuracy of ultrasonic wall thickness monitoring equipment is as follows: Step 1: Use the probe of the ultrasonic wall thickness monitoring device to measure the thickness of the test point a (8) from top to bottom and left to right, and read the wall thickness reading of the ultrasonic wall thickness monitoring device. Step 2: Grind or weld below test point a (8), and simultaneously measure the area below test point a (8) using the ultrasonic wall thickness monitoring device and ultrasonic thickness gauge. Step 3: Compare the readings of the ultrasonic wall thickness monitoring device with the actual wall thickness to verify and calculate the measurement accuracy of the ultrasonic wall thickness monitoring device.

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