Metal rotor flow meter selection formula and installation and use attention

Abstract: The selection formula of metal rotor flowmeter and the information on installation and use are provided by excellent flowmeter and flowmeter manufacturers and quotation manufacturers. As a primary detection element for small flow measurement, the metal rotor flowmeter has been successively applied in the argon metering system of the special steel plant, the oxygen metering system of the medium-sized plant and the oxygen metering system of the machinery plant. stabilized. For more flowmeter manufacturers, you are welcome to inquire about the model selection and price quotation. The following is the selection formula of the metal rotor flowmeter and the details of the installation and use articles. As a primary detection element for small flow measurement, the metal rotor flowmeter has been successively applied in the argon metering system of the special steel plant, the oxygen metering system of the medium-sized plant and the oxygen metering system of the machinery plant. It has been running stably for several months and has achieved good measurement results. The following is a brief description of the characteristics, selection and use of metal rotor flowmeters. 1. Measuring principle and characteristics of metal rotameter The measuring part of metal rotameter is composed of an orifice plate and a conical float. When the fluid flows upward through the pipe, the conical float moves upward and reaches equilibrium at a certain position. The annular gap between the float and the orifice plate is kept constant, and the annular gap area is proportional to the rising height of the float, and a certain height of the float represents the flow rate. When the float moves up and down, it is transmitted to the external indicator in the form of magnetic coupling. , Make the pointer of the indicator follow the displacement of the float, and use the cam plate to make the pointer linearly indicate the flow rate. Features: The metal rotor flowmeter has simple structure, reliable operation, wide application range and high range ratio, generally 10B1. 2. Selection of metal rotameter When measuring liquid, the metal rotameter is generally marked with water under the standard state (20e); when measuring gas, it is marked with air under the standard state (20e, absolute pressure 011013MPa). scale. Therefore, when selecting the instrument for a certain measuring fluid, its flow range should be converted into the water or air flow under the standard state, and then the model should be selected according to the converted flow range against the standard scale of the metal rotor flowmeter. The following is an example of the oxygen consumption in the riveting and welding workshop in the oxygen metering system of the machinery factory. The original data are as follows: pipe diameter: Ф70@5; maximum oxygen consumption: 110m3/h; minimum oxygen consumption: 10m3/h; working pressure: 113MPa; working temperature: 30e; local average atmospheric pressure: 011MPa. Calculation: (1) Oxygen density (3) The flow correction formula under the actual use of the metal rotor flowmeter: In the formula: ZS(ZSN) is the compression coefficient of the measured gas under the standard state (working state) (generally ZSUZSN) ); QS is the actual flow of oxygen under working conditions; QN is the actual flow of air under standard conditions; QN is the density of air under standard conditions (11293kg/m3); pN is the standard atmospheric pressure; TN is the standard temperature 293115K; QSN is the standard The density of oxygen (ie Q20) under the conditions; pS is the actual working pressure of oxygen (ie p1); TS is the actual working temperature of oxygen (ie T1). According to the selection manual of metal rotameter products, LZDH-25 (315~35) is the most suitable. 3. Setting of the upper limit of the flow rate of the secondary meter Taking the oxygen consumption in the riveting and welding workshop as an example, the selected secondary meter is the compensation type intelligent flow totalizer produced by Jinan Zhonghuan Automation Research Institute. The parameters to be set in the middle ring meter are: FH, PH, Ph, Ps, CH, Ch, Cs. The upper flow limit FH of the flow meter should be the oxygen flow rate in the standard state corresponding to the upper limit of the scale of the metal rotameter. The scale is marked for air in the standard state, so it must be converted to the oxygen flow in the standard state. QN upper (QN lower): that is, the upper (lower) limit of the flow rate of the metal rotor flowmeter according to the air calibration in the standard state. According to the metal rotor flowmeter of the selected model LZDH-25 (315~35), the measuring range of oxygen is 121711m3/h~127111m3/h. It basically meets the measurement requirements of 11m3~110m3. 4. Precautions during installation and use of metal rotor flowmeter (1) The flowmeter must be installed vertically, the fluid to be measured passes through the flowmeter from bottom to top, and the inlet and outlet are guaranteed to have a straight pipe section with 5 times the diameter of the instrument. For new installations The pipeline should be flushed before the flowmeter is installed. (2) In order to facilitate the maintenance and replacement of the flowmeter, the bypass pipeline should be connected when the instrument is installed. (3) A valve should be installed upstream of the flow meter, and a flow regulating valve should be installed downstream of 5 to 10 times the diameter of the meter. For small-diameter instruments, a filter should be installed upstream. If the measured medium contains magnetic substances, a magnetic filter should be installed in front of the flowmeter. (4) When the measured medium is dirty, the tube and float should be cleaned in time. (5) The measurement accuracy of the metal rotor flowmeter is generally 215. When the measurement accuracy is required to be high, the metal rotor flowmeter should not be selected. V. Conclusion The use of metal rotor flowmeter solves the problem that small flow cannot be accurately measured, makes energy measurement more complete, and provides more reliable settlement data for the cost accounting of secondary factories and mines. The above is the whole content of this article,You are welcome to inquire about the flowmeter selection and quotation of our factory. 'Metal rotor flow meter selection formula and installation and use precautions'

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