The method of improving the accuracy of the orifice flow meter

Abstract: The information on the method of improving the accuracy of the orifice flowmeter is provided by the excellent flowmeter and flowmeter manufacturers. Usually the measurement accuracy of the orifice flowmeter can meet the requirements of the national standard, but in the actual use process, the design, manufacture, installation and use of the throttling device do not meet the requirements, which affects the flow measurement accuracy. and Shunda traffic. For more flowmeter manufacturers to select models and price quotations, you are welcome to inquire. Usually the measurement accuracy of the orifice flowmeter can meet the requirements of the national standard, but in the actual use process, the design, manufacture, installation and use of the throttling device do not meet the requirements, which affects the flow measurement accuracy. The flowmeter experts found a way to improve the measurement accuracy through the analysis of the orifice plate throttling device measurement principle, installation requirements, instrument selection and other factors. One way to improve measurement accuracy (1) Pipeline requirements: The national standard has strict technical requirements for the length, straight pipe, roundness and inner surface roughness of the metering tube. When the minimum length of the metering tube cannot meet the standard requirements, it will bring deviations to the flow measurement results.βIt is related to the Reynolds number, so the rectifier must be installed on the straight pipe in front of the orifice plate to ensure the measurement accuracy. (2) Installation requirements: the inlet end face of the orifice plate must be perpendicular to the axis of the pipeline, and the deviation cannot exceed 1 degree. When installing the orifice plate, pay attention to the direction of the pipeline, and it is strictly forbidden to install it in reverse. It must meet the requirements of the standard for different axial tolerances. The thickness of the gasket between the flange, the orifice plate and the pressure-taking device shall not be greater than 0.03D. The installation of the gasket shall not protrude into the straight pipe section or the inner cavity of the pressure-taking device, and shall not block the pressure-taking port and cause the change of the pressure-taking position. The orifice plate must be installed on the throttling device after the pipeline has been purged and operated for a few days to prevent the orifice plate from being damaged or polluted by liquid and solid impurities in the gas. In the selection of the second instrument, the differential pressure gauge should be correctly selected and used. The differential pressure measurement process is too large and the flow rate is small. The differential pressure gauge works below 30%, which will greatly reduce the flow measurement accuracy. Replace the range spring or orifice size of the differential pressure gauge, otherwise, the differential pressure error will increase exponentially. When selecting the differential pressure value of the instrument, it is necessary to consider the aperture ratioβ, and to make the pressure after the pressure loss of the orifice plate meet the production needs. Flange pressureβThe value should be between 0.15 and 0.7, which can not only ensure the measurement accuracy, but also reduce the pressure loss. Three effects of pulsating flow (1) Origin of pulsating flow. A sudden change in the flow rate and pressure of the gas in the pipeline results in a pulsating flow, which can cause fluctuations in the differential pressure, making the recorded curve a wide band. ①If the natural gas wells are co-producing gas and water, the metering differential pressure of these wells will fluctuate; ②The long-distance pipeline or gas field pipeline accumulates liquid to cause the metering differential pressure to fluctuate; ③The use of natural gas compressors causes the metering differential pressure to fluctuate; ④The gas well Differential pressure fluctuations caused by the pressure interference between the two; (2) A method of suppressing pulsatile flow. ① Eliminate or keep away from the pulsating source: adopt water control to extract gas; adopt high-efficiency separator to strengthen the separation of gas and water; the condensate accumulated in the metering pipe section, pressure guiding pipe, high and low pressure bellows chamber of the flowmeter and in the pipeline should be timely Purging or pigging. ②Control the downstream valve of the metering pipe section: Practice has proved that the control of the downstream valve has a restraining effect on the differential pressure fluctuation caused by various pulsation sources. ③Installation of buffer tank: A buffer tank can be installed before the measuring pipe section, which can store and release the energy of gas, effectively suppress the fluctuation of differential pressure caused by various pulsation sources, and can also set up a special pulsation attenuator. ④Increase differential pressure and aperture ratioβ: For the same metering pipeline, if the differential pressure is to be increased, the diameter of the orifice plate should be reduced to make the aperture ratioβIn order to increase the differential pressure and the aperture, the diameter of the metering tube must be reduced accordingly. ⑤Install pressure regulating valve: install a pressure regulating valve at the entrance before the measuring point to stabilize the output pressure, which can effectively reduce the impact of pulsation on the measurement accuracy. The fundamental reason that affects the measurement accuracy of the orifice flowmeter is whether the geometry and flow state of the throttling device deviate from the design standards. Therefore, in actual use, the throttling device, orifice plate, and double corrugated differential pressure gauge should be checked and adjusted regularly in strict accordance with the design requirements, so as to reduce the measurement error and ensure the measurement accuracy. If you have flowmeter requirements, you can be a professional flowmeter manufacturer, we will serve you wholeheartedly. The above is the whole content of this article. You are welcome to inquire about the flowmeter selection and quotation of our factory. 'Method for improving the accuracy of orifice flow meter'

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