How to reduce the error of natural gas measurement by turbine flow meter

Abstract: The information on how to reduce the error of natural gas measured by the turbine flowmeter is provided by the excellent flowmeter and flowmeter manufacturers. How to control the error (1) Correctly determine the location and specifications of the flowmeter. Due to the existence of the inertia of the natural gas 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 gas consumption. More flowmeter manufacturers choose models and price quotations. You are welcome to inquire. The following is the article details on how to reduce the error of natural gas measured by turbine flowmeters. How to control the error (1) Correctly determine the place and specifications of the flowmeter. Due to the existence of the inertia of the natural gas 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 natural gas 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 for natural gas turbine flowmeter 1. Gas natural gas turbine A filter must be installed before the flowmeter; 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, the monthly cleaning once. 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 natural gas turbine flowmeters 1. Requirements for ventilation and gas stoppage of natural gas turbine flowmeters. 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. 4. During routine maintenance or meter reading inspection, you should check whether there are abnormal symbols on the display meter. If the battery symbol flashes, it means that the battery is about to run out of power, and the battery should be replaced in time; if any abnormal alarm or abnormal warning symbol appears, it should be found in time, which will help to deal with and discover the user's illegal gas use behavior. 5. For imported turbine meters with mechanical readings and correctors, in addition to copying the volume value of the standard conditions, it is necessary to compare the readings of the base meter and the working conditions flow on the corrector in time. Normally, the two should be Not much difference. 6. When the process pipeline is overhauled, the flowmeter should be removed, and then wrap both ends with a clean cloth to prevent dirt and iron particles from falling into the flowmeter and damaging the turbine blades. 7. In order to ensure the long-term normal operation of the natural gas turbine flowmeter, the operation inspection of the instrument should be strengthened, and the rotation of the impeller should be monitored. If the sound is abnormal, the internal parts of the sensor should be removed and checked in time. If the turbine bearing is seriously worn or the blade is damaged, it must be repaired, replaced, and re-calibrated. 8. For sensors with lubricating oil or cleaning fluid injection ports, lubricating oil or cleaning fluid should be injected regularly as required to ensure good operation of the impeller. Long-term continuous operation without lubricating oil will inevitably cause fatal wear, increase damping force and cause slower operation, negative difference in measurement results and affect service life; the above is the entire content of this article, you are welcome to inquire about the flowmeter selection of our factory , quotation, etc. 'How to reduce the error of natural gas measurement by turbine flow meter'

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