Circular chamber orifice flowmeter | Illustrated electromechanical 2022- Pressure tapping method of orifice flowmeter

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What factors can affect the accuracy of orifice flowmeter readings? The accuracy of orifice flowmeter readings is affected by the following factors: orifice plate processing quality: inlet edge shape: the inlet edge of the orifice plate must be made sharp and not smooth. Sharp edges can ensure more accurate pressure drop when the fluid passes through the orifice plate, thereby improving the accuracy of flow measurement. Surface smoothness: The inlet and inner surfaces of the orifice plate should be smooth and free of defects such as spots, burrs, scratches, etc. These defects may affect the flow state of the fluid, leading to inaccurate pressure drop measurements and subsequently affecting the readings of the flow meter. Orifice plate and ring chamber status: The orifice plate and ring chamber should not be corroded or dirty. Rust and dirt can increase the resistance of fluid flow, change the flow state of the fluid, and thus affect the accuracy of the flowmeter. Installation quality: Installation position. Filial piety: The orifice plate should be installed in the straight pipe section, and there should be a distance of pipeline (usually the length of diameter D) before and after the orifice plate. There should be no protruding padding, welding marks, or dirt in this pipeline section. These protrusions can interfere with fluid flow, resulting in inaccurate pressure drop measurements. Installation direction: The installation direction of the orifice plate cannot be mistaken, and the sharp edge of the inlet should face the flow direction of the fluid. Usually, a "+" sign is marked on the orifice plate to indicate the correct installation direction. If the installation direction is incorrect, the flow state of the fluid will be affected, resulting in inaccurate flow measurement. The center of the orifice plate must coincide with the center of the pipeline. If the orifice plate deviates from the center of the pipeline, it will cause uneven pressure drop when the fluid passes through the orifice plate, thereby affecting the accuracy of the flowmeter. Fluid applicability: The orifice plates for different fluids (such as oxygen and nitrogen flow orifice plates) cannot be replaced incorrectly. Because the coefficient K in the flow calculation formula is related to factors such as fluid density, orifice plates for different fluids have different coefficients K. If the orifice plate is replaced incorrectly, the relationship between flow rate and pressure difference will change, resulting in inaccurate measurements. Usage conditions: Moisture in the fluid: When there is moisture in the measured fluid, attention should be paid to gas water separation and the measuring tube should be heated to prevent water analysis or freezing. Moisture can affect the flow state and density of fluids, thereby affecting the accuracy of flow meters. Pressure tube airtightness: The airtightness of the pressure tube must be ensured and no air leakage is allowed. If the pressure tube leaks, it will cause inaccurate pressure difference measurement, thereby affecting the reading of the flowmeter. Temperature and pressure differences: When the actual temperature and pressure differ significantly from the design values, the readings should be corrected. Because the measurement principle of flow meters is based on the meandering state of fluid flow under certain temperature and pressure conditions. If the actual conditions differ significantly from the design conditions

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