How to Improve the Measurement Accuracy of Turbine Flow Meters

Abstract: The information on how to improve the measurement accuracy of the turbine flowmeter is provided by the excellent flowmeter and flowmeter manufacturers. Gas turbine flowmeter has the advantages of high sensitivity, good repeatability, wide range ratio and high precision, and has been widely used in natural gas trade settlement and measurement, and even as a standard instrument for value transmission. With the full development of my country's urban gas projects as well. More flowmeter manufacturers choose models and price quotations. You are welcome to inquire. The following is the article details on how to improve the measurement accuracy of turbine flowmeters. Gas turbine flowmeter has the advantages of high sensitivity, good repeatability, wide range ratio and high precision, and has been widely used in natural gas trade settlement and measurement, and even as a standard instrument for value transmission. With the full development of my country's urban gas projects and the continuous improvement of the requirements for gas commercial trade and handover measurement, the gas turbine flowmeter has gradually become one of the preferred instruments for my country's urban gas commercial trade and handover measurement. 1. Principle of Turbine Flowmeter Turbine flowmeter is a kind of speed flowmeter, which uses gas to drive the impeller of the flowmeter to rotate, and the speed of the impeller rotation is proportional to the volume flow of the fluid. A pulse signal proportional to the volume flow of the fluid is induced on the impeller, and the volume flow is obtained through arithmetic processing. Its measurement accuracy is high, and the accuracy level can reach 1.0 and 1.5; the range ratio is wide, generally 1:20, and the measurement range is wide; the structure is compact and lightweight, easy to install and maintain. . 2. Reasons for errors Turbine flowmeters also have the following shortcomings: there are moving parts, which are easy to be damaged, key parts bearings are easy to wear, poor anti-fouling ability, high requirements for the cleanliness of the medium, and it is difficult to maintain the calibration characteristics for a long time. Check regularly. The reasons for the error include: the quality of the meter itself, unreasonable design and selection, improper installation, improper maintenance during operation, etc. 3. How to control the error (1) Correctly determine the place and specification of the flowmeter. Due to the existence of the turbine inertia of the turbine flowmeter, it is not suitable for use in occasions with frequent flow fluctuations, otherwise the measurement accuracy will be reduced. To more accurately estimate the peak and valley value of gas consumption and the pressure of the medium, correctly determine the specifications of the flowmeter. It can be seen from the error characteristic curve of the turbine flowmeter that the working flow range of the flowmeter should be 20%Qmax-80%Qmax (Qmax is the maximum flow rate of the flowmeter) (2) Installation requirements of the turbine flowmeter 1. Before the gas turbine flowmeter The filter must be installed; the filter should be kept unobstructed. If the filter is found to be blocked (it can be judged by the pressure difference between the inlet and outlet of the filter), the filter should be cleaned in time. If the differential pressure gauge is not equipped, it should be cleaned once a month. 2. To ensure the requirements of the straight pipe section, especially if there is a reduced diameter or half-open valve in front of the meter. 3. During installation, the gasket shall not protrude into the pipeline, and there shall be no obvious deviation between the flowmeter and the axis of the pipeline, and installation stress shall not be generated. 4. When installing, be sure to clean up all impurities in the pipeline to prevent the bearings and turbine from getting stuck. (3) Operation management and maintenance requirements of turbine flowmeter 1. Requirements for ventilation and gas stop of turbine flowmeter. Ventilation sequence: ensure that the valve at the back end of the flow meter is closed; then slowly open the valve at the front end of the flow meter to ensure the speed of pressure increase≤35KPa/S; Finally, slowly open the valve at the back end of the flowmeter to make it run from a small flow until it is adjusted to the required value. The entire process remains pressurized to start. Stop gas sequence: first slowly close the back-end valve of the flowmeter; then slowly close the front-end valve of the flowmeter. 2. Prevent excessive operation for a long time. Excessive flow operation will seriously affect the service life, reduce the measurement accuracy, and cause the error to increase; (note that the flow rate percentage under the working condition of the meter head should not exceed 100% for a long time) Instantaneous flow: from the observation of the instantaneous flow, combined with the user's gas consumption at that time Determine whether there is a small fire that does not go away, or a large fire that exceeds the range. The flow range should be between 20% and 70% when the instrument is running. If the long-term low limit operation or high limit operation will affect the measurement; whether it is the user's gas load or the gas-consuming equipment has changed, it should be solved in time. 3. Pay attention to the values ​​of temperature and pressure. According to the gaseous equation: In the equation: V0——Volume in standard state (m3) V——Volume in working state (m3) Zg——Gas compressibility P=Pa+Pg under working condition——Absolute pressure (kPa) Pa at the pressure detection point of the flowmeter——Local atmospheric pressure (kPa) Pg——Gauge pressure at the pressure detection point of the flowmeter (kPa) Po——Standard atmospheric pressure (101.325kPa) To——Absolute temperature in standard state (293.15K) T——Absolute temperature under medium working conditions (273.15+t) Kt——Measured medium Celsius temperature (e) FZ——It can be seen from the formula of the gas compression factor that the errors are mainly concentrated in the detection accuracy of pressure and temperature. When it is found that the flow rate, temperature, pressure value and the actual deviation are large or the displayed value is unstable, or there is a large difference with the previous experience value. Deviations should be dealt with in a timely manner.

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