Gas turbine flowmeter has the advantages of high sensitivity, good repeatability, wide range ratio, high precision, etc. It has been widely used in natural gas trade settlement measurement, and even as a standard meter for value transfer. With the full-scale development of China's urban gas projects and the continuous improvement of gas commercial trade and handover measurement requirements, gas turbine flow meters have gradually become one of the preferred instruments for China's urban gas commercial trade and handover measurement.
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The gas turbine flowmeter is a speed type flowmeter. The gas is used to push the flowmeter impeller to rotate. The speed of the impeller rotation is proportional to the volumetric flow of the fluid. According to the principle of electromagnetic induction, a magnetic sensor is used to induce fluid from the synchronously rotating impeller. The volumetric flow rate is proportional to the pulse signal, and the volumetric flow rate is calculated by the operation process. Its high measurement accuracy, accuracy level can reach 1.0, 1.5; wide range ratio, generally 1:20 wide measurement range; compact and lightweight, easy to install and maintain straight pipe before and after the lower requirements, can be used for medium and high pressure measurement .
Turbine flowmeters also have the following disadvantages: they have movable parts, they are easily damaged, bearings of key parts are apt to wear, and they are poor in dirt resistance. They require high cleanliness of the medium. They are difficult to maintain calibration characteristics for a long period of time and require regular calibration. Caused by the error are: the quality of the meter itself, design selection is unreasonable, installation is not in place, improper maintenance and other operations.
How to control the error? Correctly determine the location and specifications of the flowmeter. Because of the existence of the turbine flowmeter turbine inertia, it is not suitable to use in occasions with frequent flow fluctuations, otherwise it will reduce the measurement accuracy. It is necessary to accurately estimate the peak-to-valley value of the gas volume and the pressure condition of the medium and correctly determine the specifications of the flowmeter.
Gas turbine flowmeter must be installed before the filter; should keep the filter open, if it is found that the filter is blocked (can be judged by the filter out of the pressure difference), the filter should be cleaned in time, if not with the differential pressure meter Clean once a month. To ensure the requirements of the straight section, in particular, there is a reduced diameter or half-open valve in front of the table. During installation, the gasket must not protrude into the pipeline. There must be no visible deviation between the flowmeter and the axis of the pipeline, and no installation stress may occur. When installing, be sure to clean all impurities in the clean pipe to prevent the bearing and the turbo stuck.
