Method for troubleshooting problems of uniform-speed tube flow meter

Abstract

The invention relates to a method for troubleshooting problems of a uniform-speed tube flowmeter, which comprises the steps of troubleshooting an installation standard, an installation specification and carrying out a problem troubleshooting operation process under the condition that the installation standard and the installation specification are met, and the problems of the uniform-speed tube flowmeter are confirmed through troubleshooting of the parts and the problems, so that the problems are quickly and timely processed. Problems are searched from the equipment installation standards and specifications; according to the method, the installation standards and the installation specifications are checked, whether basic problems and errors exist or not during installation of the uniform-speed tube flowmeter is found, and therefore frequent problems caused by the fact that the installation standards and the installation specifications do not meet the requirements are solved, the fault occurrence frequency is reduced, the production efficiency is improved, and the production cost is reduced. According to the method, the problem checking process is rapid, accurate and comprehensive, the problems of the uniform-speed tube flowmeter are checked and solved, the fault processing time is shortened, and maintenance personnel are guided to check and solve the problems.

Description

Technical Field

[0001] The present invention relates to the technical field of measuring equipment, and in particular to a method for troubleshooting problems of an averaging tube flowmeter. Background Art

[0002] The average velocity tube flowmeter is prone to measurement deviation during use, but the troubleshooting process may be omissions and incomplete, the focus of the problem is not clear during the troubleshooting process, and the solution time is long. It is also possible that the installation does not meet the standards and specifications, resulting in frequent problems with the subsequent average velocity tube flowmeter. Even if the current fault problem is solved, it will still recur, seriously affecting the measurement in production and reducing production efficiency.

[0003] A Chinese patent with publication number CN108168659B discloses an intelligent diagnosis method for a vortex flowmeter, the method comprising the following steps: troubleshooting the parameter settings of the flowmeter; troubleshooting the sensor failure of the instrument; and troubleshooting the measurement abnormalities caused by the on-site working conditions. The invention is based on a Web-based diagnostic human-computer interaction interface, which is intuitive and concise, avoiding the cost of maintenance personnel going to the site for inspection; a diagnostic discrimination method based on a similarity algorithm has good adaptability and can reduce the professional quality requirements for maintenance personnel; an intelligent classifier judgment method using the AdaBoost algorithm is introduced. When enough training samples are accumulated and the classifier is trained with enough samples, the on-site sensor data analysis no longer uses the similarity method, and the classifier quickly outputs the diagnosis results, thereby improving the diagnostic efficiency; however, the patent only provides solutions after a problem occurs, and does not check the installation standards and specifications. Summary of the invention

[0004] The present invention provides a method for troubleshooting problems of an averaging tube flowmeter, which can quickly, accurately and comprehensively troubleshoot and solve problems of the averaging tube flowmeter, shorten fault handling time and guide maintenance personnel to find and solve problems.

[0005] In order to achieve the above object, the present invention adopts the following technical solutions:

[0006] A method for troubleshooting problems of an average velocity tube flowmeter, comprising the following contents:

[0007] 1) Check the installation standards:

[0008] (1) Check whether the installation of the flow source components meets the requirements: the uniform tube flowmeter is installed on the straight pipe section of the pipeline, and the installation angle is that the pressure measuring hole is installed facing the flow direction, and the allowable angle deviation is not more than 3°;

[0009] (2) Check whether the installation of the pressure source component meets the requirements: when the measured material flow is stable and the pressure source component is on the same pipeline as the temperature source component, it should be installed on the upstream side of the temperature source component; the end of the pressure source component should not exceed the inner wall of the equipment or pipeline where the pressure source component of the uniform tube flowmeter is installed, and it should be installed at an acute angle along the material flow on the horizontal pipeline; the pressure instrument installed on site should be installed on the equipment or pipeline to avoid vibration frequency greater than 100 Hz and amplitude greater than 0.1 mm;

[0010] (3) Check whether the valve installation meets the requirements: the valve is installed on the upstream side of the flow meter, and the distance from the flow meter must be no less than 10 to 15 times the inner diameter of the pipeline. The valve selected according to different media should be of the corresponding matching type;

[0011] 2) Check the installation specifications: ensure that the flow meter is correctly installed and firmly fixed on the pipeline, follow the technical manual or installation guide provided by the manufacturer, and avoid collision or damage to the sensor part of the flow meter;

[0012] 3) When the installation standards and installation specifications are met, the troubleshooting process is carried out, which specifically includes the following steps:

[0013] S1. Preliminary appearance and installation inspection of the uniform tube flowmeter;

[0014] S2. Check whether the parameter settings are correct;

[0015] S3. Problem solving, maintenance and recording.

[0016] Furthermore, the flow source sampling component also includes a detection rod, and the detection rod installation standard is: the detection rod passes through and is perpendicular to the center line of the pipeline, and the error of the detection rod from the center line of the pipeline and the non-perpendicularity to the axis is no more than 3°.

[0017] Furthermore, the flow source component further comprises a throttling device, and when the throttling device is installed on a horizontal or inclined pipeline,

[0018] When measuring liquid flow, the throttling device is set in the lower half of the pipeline, and the detection rod forms an angle of 0 to 45° with the horizontal center line of the pipeline;

[0019] When measuring gas flow, the throttling device is set in the upper half of the pipeline, and the detection rod is within the range of 0 to 45° between the horizontal center line of the pipeline;

[0020] When measuring steam flow, the throttling device is set at the horizontal center line of the pipeline, and the detection rod is within the angle range of 0 to 45°.

[0021] Furthermore, the flow source component further includes a thermometer, which is installed upstream of the throttling device, and the straight pipe section distance between the thermometer and the throttling device meets the following conditions:

[0022] (1) When the diameter of the thermometer plug or sleeve is less than or equal to 0.03D, D is the inner diameter of the pipeline, and the straight pipe distance between the thermometer and the throttling device is not less than 5D;

[0023] (2) When the diameter of the thermometer socket or sleeve is between 0.03D and 0.13D, the straight pipe distance between the thermometer and the throttling device shall not be less than 20D.

[0024] Furthermore, the preliminary appearance and installation inspection of the uniform tube flowmeter includes the following contents:

[0025] (1) Check the appearance of the uniform tube flowmeter to see if it is intact and whether there are any obvious signs of damage;

[0026] (2) Check whether the root of the throttling device and the connection of the back pressure pipeline valve are loose or leaking;

[0027] (3) Check whether the sewage discharge is normal and confirm whether the pipeline is blocked due to excessive impurities;

[0028] (4) Check whether the power supply voltage of the instrument signal line is normal;

[0029] (5) Check whether the line is laid at the location of the power cable to prevent interference from strong magnetic fields and strong electrostatic fields.

[0030] Furthermore, the parameter setting check whether it is correct includes the following contents:

[0031] (1) Check whether the parameters of the uniform tube flowmeter are set correctly, including range, unit, temperature and pressure, by referring to the calculation sheet;

[0032] (2) If the parameter settings are correct, check whether the zero point of the uniform tube flowmeter is normal and perform calibration and calibration;

[0033] (3) Check whether the parameter settings of the paperless recorder are normal, including whether square root extraction, temperature and pressure compensation, unit, range, temperature, and pressure are correct.

[0034] Compared with the prior art, the present invention has the following beneficial effects:

[0035] 1) Through the investigation of installation standards and installation specifications, find out whether there are basic problems and errors in the installation of the average velocity tube flowmeter, so as to solve the frequent problems caused by the failure of installation standards and installation specifications to meet the requirements, reduce the frequency of failures, and thus improve production efficiency;

[0036] 2) The problem troubleshooting process of the present invention can be used to quickly, accurately and comprehensively troubleshoot and solve problems that occur in the average velocity tube flowmeter, shorten the fault handling time, and guide maintenance personnel to find and solve the problems. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] Figure 1 It is a schematic diagram of the allowable deviation angle of the total pressure measuring hole of the uniform tube flowmeter described in the present invention when installed facing the flow direction.

[0038] Figure 2 It is a schematic diagram of the allowable deviation angle when the detection rod of the present invention passes through and is perpendicular to the center line of the pipeline.

[0039] Figure 3 It is a schematic diagram of the angle between the throttling device of the present invention and the horizontal center line of the pipeline when measuring liquid flow.

[0040] Figure 4 It is a schematic diagram of the angle between the throttling device of the present invention and the horizontal center line of the pipeline when measuring gas flow.

[0041] Figure 5 The present invention is a schematic diagram of the angle between the throttling device of the present invention and the horizontal center line of the pipeline when measuring steam flow.

[0042] In the picture: 1. Pipeline 2. Detection rod DETAILED DESCRIPTION

[0043] The specific implementation of the present invention will be further described below in conjunction with the accompanying drawings:

[0044] The present invention provides a method for troubleshooting problems of an average velocity tube flowmeter. First, starting from the standards and specifications for equipment installation, finding out whether the average velocity tube flowmeter complies with the requirements and operating guidelines during the installation process, and secondly calibrating the equipment parameters, checking whether the instrument parameters and the instrument zero point are normal, and then checking the integrity of the instrument pipe line, whether there is leakage or damage, and then checking the status confirmation of the compensation instrument, the unit of the signal conversion instrument, the square root path, the instrument range and other information confirmation. Through the troubleshooting of the above parts and problems, the problem of the average velocity tube flowmeter is confirmed, and then it is quickly and timely handled. Starting from the standards and specifications for equipment installation, finding the problem specifically includes the following contents:

[0045] 1. Installation standard check

[0046] (1) Flow source components

[0047] Installation location: The uniform tube flowmeter is installed on the straight section of pipeline 1, ensuring that the length of the straight sections before and after meet the manufacturer's requirements;

[0048] Installation angle: The total pressure measuring hole should be installed facing the flow direction, and the angle deviation is allowed to be no more than 3°. Figure 2 , the detection rod 2 of the flow meter, so as to ensure the accuracy of the measurement results;

[0049] Installation of detection rod 2: detection rod 2 passes through and is perpendicular to the center line of pipeline 1, see Figure 1, the error of its deviation from the center and non-perpendicularity to the axis is no more than 3°, so as to ensure that the detection rod 2 can correctly measure the flow of the fluid in the pipeline 1;

[0050] When the throttling device is installed on a horizontal or inclined pipeline 1, the orientation of the pressure tapping port shall meet the following conditions:

[0051] When measuring liquid flow, the throttling device is set in the lower half of the pipeline 1, and the detection rod 2 forms an angle of 0 to 45° with the horizontal center line of the pipeline 1. Figure 3 ;

[0052] When measuring gas flow, the throttling device is set in the upper half of the pipeline 1, and the detection rod 2 is within the range of 0 to 45° between the horizontal center line of the pipeline 1. Figure 4 ;

[0053] When measuring steam flow, see Figure 5 The throttling device is arranged at the horizontal center line of the pipeline 1, and the detection rod 2 is within the range of an angle of 0 to 45°.

[0054] When installing a thermometer upstream of a throttling device, the straight pipe distance between the thermometer and the throttling device should meet the following conditions:

[0055] When the diameter of the thermometer plug or sleeve is less than or equal to 0.03D (D is the inner diameter of the pipe 1), it shall not be less than 5D;

[0056] When the diameter of the thermometer socket or sleeve is between 0.03D and 0.13D, it shall not be less than 20D.

[0057] 2) Pressure source components

[0058] Installation position: Installed at the stable position of the material flow to be measured. When it is on the same pipeline 1 as the temperature source component, it should be installed on the upstream side of the temperature source component.

[0059] Installation requirements: The end of the pressure source component shall not exceed the inner wall of the container, reactor, pipeline 1 system or other process equipment or pipeline 1 where the pressure source component of the uniform tube flowmeter is installed. When detecting the pressure of turbid materials such as dust, solid particles or sediment, the source component should be installed upward at an angle, and on the horizontal pipeline 1, it should be installed at an acute angle along the material flow beam; pressure instruments installed on site should avoid being installed on equipment or pipeline 1 that can produce strong vibrations.

[0060] 3) Valve installation

[0061] (1) The valve is installed on the upstream side of the flow meter and the distance from the flow meter should be no less than 12 times the inner diameter of the pipe to ensure that the flow of the fluid is not hindered and the flow of the fluid can be effectively controlled;

[0062] (2) Select the corresponding type of valve according to different media. For example, for high-pressure fluid, a high-pressure valve should be selected; for corrosive fluid, a corrosion-resistant valve should be selected;

[0063] (3) When operating the valve, be careful not to open or close the valve excessively to avoid damage to the flow meter. At the same time, pay attention to the sealing performance of the valve to ensure that the fluid does not leak.

[0064] 2. Check the installation specifications: Check whether the technical manual or installation guide provided by the manufacturer is followed during the installation process to ensure that the flow meter is correctly installed and firmly fixed on the pipe 1. At the same time, pay attention to protecting the sensor part of the flow meter to avoid collision or damage;

[0065] It should be noted that the specific installation standards will vary depending on the manufacturer and model. Therefore, before troubleshooting and reinstalling, you should carefully read the technical manual or installation guide provided by the manufacturer and install it according to the requirements.

[0066] 3. When the installation standards and installation specifications are met, the troubleshooting process includes the following steps:

[0067] First, confirm whether the uniform tube flowmeter has any abnormal phenomenon, such as inaccurate flow reading, large fluctuation, no flow display, etc.

[0068] 1. Preliminary inspection:

[0069] (1) Check the appearance of the uniform tube flowmeter to see if it is intact and whether there are any obvious signs of damage;

[0070] (2) Check whether the root of the throttling device and the connection of the back pressure pipeline valve are loose or leaking;

[0071] (3) Check whether the sewage discharge is normal and confirm whether the pipeline is blocked due to excessive impurities;

[0072] (4) Check whether the power supply voltage of the instrument signal line is normal;

[0073] (5) Check whether the pressure source components and temperature source components are normal;

[0074] (6) Check whether the line is laid at the location of the power cable to prevent interference from strong magnetic fields and strong electrostatic fields.

[0075] 2. Parameter setting check:

[0076] (1) Check whether the parameters of the uniform tube flowmeter are set correctly, including range, unit, temperature, pressure, etc., by referring to the calculation sheet;

[0077] (2) If the parameter settings are correct, check whether the zero point of the uniform tube flowmeter is normal and perform calibration and calibration;

[0078] (3) Check whether the parameter settings of the paperless recorder are normal, including whether square root extraction, temperature and pressure compensation, unit, range, temperature, and pressure are correct.

[0079] 3. Problem solving and maintenance:

[0080] Based on the inspection results, determine the problem and perform corresponding repairs or replace parts. After the repairs are completed, test the uniform tube flowmeter to ensure that it returns to normal working condition.

[0081] 4. Records and reports:

[0082] Record the troubleshooting process, maintenance measures and results in detail, compile a report and archive it, and submit the report at the same time.

[0083] The above embodiments are implemented based on the technical solution of the present invention, and detailed implementation methods and specific operation processes are given, but the protection scope of the present invention is not limited to the above embodiments. The methods used in the above embodiments are conventional methods unless otherwise specified.

Claims

1. A method for troubleshooting problems of an average velocity tube flowmeter, characterized in that: It includes the following: 1) Check the installation standards: (1) Check whether the installation of the flow source components meets the requirements: the uniform tube flowmeter is installed on the straight pipe section of the pipeline, and the installation angle is that the pressure measuring hole is installed facing the flow direction, and the allowable angle deviation is not more than 3°; (2) Check whether the installation of the pressure source component meets the requirements: when the measured material flow is stable and the pressure source component is on the same pipeline as the temperature source component, it should be installed on the upstream side of the temperature source component; the end of the pressure source component should not exceed the inner wall of the equipment or pipeline where the pressure source component of the uniform tube flowmeter is installed, and it should be installed at an acute angle along the material flow on the horizontal pipeline; the pressure instrument installed on site should be installed on the equipment or pipeline to avoid vibration frequency greater than 100 Hz and amplitude greater than 0.1 mm; (3) Check whether the valve installation meets the requirements: the valve is installed on the upstream side of the flow meter, and the distance from the flow meter must be no less than 10 to 15 times the inner diameter of the pipeline. The valve selected according to different media should be of the corresponding matching type; 2) Check the installation specifications: ensure that the flow meter is correctly installed and firmly fixed on the pipeline, follow the technical manual or installation guide provided by the manufacturer, and avoid collision or damage to the sensor part of the flow meter; 3) When the installation standards and installation specifications are met, the troubleshooting process is carried out, which specifically includes the following steps: S1. Preliminary appearance and installation inspection of the uniform tube flowmeter; S2. Check whether the parameter settings are correct; S3. Problem solving, maintenance and recording.

2. The method for troubleshooting an average velocity tube flowmeter according to claim 1, characterized in that: The flow source component also includes a detection rod, and the detection rod installation standard is: the detection rod passes through and is perpendicular to the center line of the pipeline, and the error of the detection rod from the center line of the pipeline and the non-perpendicularity to the axis is no more than 3°.

3. The method for troubleshooting an average velocity tube flowmeter according to claim 1, characterized in that: The flow source component also includes a throttling device. When the throttling device is installed on a horizontal or inclined pipeline, When measuring liquid flow, the throttling device is set in the lower half of the pipeline, and the detection rod forms an angle of 0 to 45° with the horizontal center line of the pipeline; When measuring gas flow, the throttling device is set in the upper half of the pipeline, and the detection rod is within the range of 0 to 45° between the horizontal center line of the pipeline; When measuring steam flow, the throttling device is set at the horizontal center line of the pipeline, and the detection rod is within the angle range of 0 to 45°.

4. A method for troubleshooting an average velocity tube flowmeter according to claim 3, characterized in that: The flow source component also includes a thermometer, which is installed upstream of the throttling device. The straight pipe distance between the thermometer and the throttling device meets the following conditions: (1) When the diameter of the thermometer plug or sleeve is less than or equal to 0.03D, D is the inner diameter of the pipeline, and the straight pipe distance between the thermometer and the throttling device is not less than 5D; (2) When the diameter of the thermometer socket or sleeve is between 0.03D and 0.13D, the straight pipe distance between the thermometer and the throttling device shall not be less than 20D.

5. The method for troubleshooting an average velocity tube flowmeter according to claim 1, characterized in that: The preliminary appearance and installation inspection of the uniform tube flowmeter includes the following: (1) Check the appearance of the uniform tube flowmeter to see if it is intact and whether there are any obvious signs of damage; (2) Check whether the root of the throttling device and the connection of the back pressure pipeline valve are loose or leaking; (3) Check whether the sewage discharge is normal and confirm whether the pipeline is blocked due to excessive impurities; (4) Check whether the power supply voltage of the instrument signal line is normal; (5) Check whether the line is laid at the location of the power cable to prevent interference from strong magnetic fields and strong electrostatic fields.

6. The method for troubleshooting an average velocity tube flowmeter according to claim 1, characterized in that: The parameter setting check includes the following contents: (1) Check whether the parameters of the uniform tube flowmeter are set correctly, including range, unit, temperature and pressure, by referring to the calculation sheet; (2) If the parameter settings are correct, check whether the zero point of the uniform tube flowmeter is normal and perform calibration and calibration; (3) Check whether the parameter settings of the paperless recorder are normal, including whether square root extraction, temperature and pressure compensation, unit, range, temperature, and pressure are correct.

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