How to improve the accuracy of the orifice flow meter

Abstract: The information on how to improve the accuracy of the orifice flow meter is provided by the excellent flow meter and flow meter manufacturers. Due to the sudden change of gas velocity and pressure in the pipeline, pulsating flow is caused, which can cause fluctuations in differential pressure. The flow calculation formula of the throttling device is based on the stable flow of the orifice plate. When there is pulsation at the measurement point , the stabilization principle cannot. More flowmeter manufacturers choose models and price quotations. You are welcome to inquire. The following is the article details on how to improve the accuracy of the orifice flowmeter. Due to the sudden change of gas velocity and pressure in the pipeline, pulsating flow is caused, which can cause fluctuations in differential pressure. The flow calculation formula of the throttling device is based on the stable flow of the orifice plate. When there is pulsation at the measurement point When , the stability principle cannot be established, thus affecting the measurement accuracy and causing measurement errors. The total uncertainty of the pulse flow is equal to the combination of the measurement error calculated according to GB/T2624-93 and the additional uncertainty of the pulse. In the formula: ET-additional uncertainty of pulsation, dimensionless; -Axial time-averaged velocity, m/s; -Root mean square value of velocity pulsation component, m/s. (Formula application conditions≤0.32) Therefore, in order to ensure the accuracy of natural gas metering, the pulsating flow must be suppressed. Commonly used measures are: (1) Under the condition that the metering capacity is met, a measuring tube with a smaller inner diameter should be selected to increase the differential pressure and aperture ratio; (2) A short pressure-inducing pipeline is used to reduce the resistance parts in the pipeline and make the The lengths of upstream and downstream pipelines are equal to reduce resonance in the system and increase in pressure pulsation amplitude; (3) Eliminate free liquid from the pipeline, and the pulsation caused by the accumulation of liquid in the pipeline can be handled by an automatic pigging system or a liquid separator installed at a low position . 2. The design and installation of the metering device should comply with Taiwan SY/T 6143-1996. The fundamental reason that affects the measurement accuracy of the orifice flowmeter is whether the geometry and flow dynamics of the throttling device deviate from the design standards. Therefore, the system must be regularly checked and maintained during use, and changes in operating parameters such as pressure, temperature, and flow in actual use should be corrected in time. A fully compensated flow computer integration scheme can be used to reduce measurement errors and ensure measurement accuracy. 3. Avoid man-made measurement errors, strengthen measurement management, and improve the technical quality of operators. The above is the whole content of this article. You are welcome to inquire about the flowmeter selection and quotation of our factory. 'How to Improve the Accuracy of Orifice Flow Meters'

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