Factors to be considered in the selection of gas flow meters

Abstract: Factors to be considered in the selection of gas flow meters are provided by excellent flowmeter and flowmeter manufacturers. It is a very important step for customers to select the type of flowmeter for the site. It is necessary to comprehensively consider the actual working conditions of the site to select the most suitable metering instrument. The following is a flowmeter from Heshunda to share with you about the selection of gas flowmeters. factor:. More flowmeter manufacturers choose models and price quotations. You are welcome to inquire. The following are the factors to be considered in the selection of gas flowmeters. It is an important step for customers to select the type of flowmeter for the site. It is necessary to comprehensively consider the actual working conditions of the site to select the most suitable metering instrument. The flowmeter will share with you the factors that need to be considered in the selection of gas flowmeters: 1. Accuracy level: Generally speaking, the selection of turbine flowmeter is mainly based on its high accuracy, but the higher the accuracy of the flowmeter, the more sensitive it is to changes in the field conditions of use. Therefore, the choice of meter accuracy should be Caution, should be considered from an economic point of view. For the trade settlement instruments of large-diameter gas pipelines, it is cost-effective to invest more in the instruments, and for occasions where the transportation volume is not large, the medium-precision level can be selected. 2. Flow range: The selection of the flow range of the turbine flowmeter has a great influence on its accuracy and service life, and each type of flowmeter has a certain measurement range, and the selection of the flowmeter diameter is also determined by the flow range . The principle of selecting the flow range is: the minimum flow rate in use shall not be lower than the minimum flow rate allowed by the instrument, and the maximum flow rate in use shall not be higher than the maximum flow rate allowed by the instrument. For intermittent work occasions where the actual running time of the instrument per day does not exceed 8 hours, select 1.3 times the maximum flow rate in actual use as the upper limit of the flow range; for continuous working occasions where the actual running time of the instrument per day is not less than 8 hours, select the 1.4 times the maximum flow rate during use as the upper limit of the flow range. The lower limit flow rate of the instrument is appropriate to be 0.8 times the actual minimum flow rate. 3. Gas density: The influence of gas flow meter and fluid physical properties is mainly gas density, which has a greater impact on the meter coefficient, and is mainly in the low flow area. If the gas density changes frequently, corrective measures should be taken to the flow coefficient of the flowmeter. 4. Pressure loss: try to choose a turbine flowmeter with a small pressure loss. Because the pressure loss of the fluid passing through the turbine flowmeter is smaller, the energy consumed by the fluid from the input to the output pipeline will be less, that is, the total power required will be reduced, which can greatly save energy, reduce transportation costs, and improve utilization. . Some people have done tests, and the main component that affects the pressure loss is the front deflector of the turbine flowmeter. Compared with the front deflector of the semi-ellipsoid, the pressure loss of the former turbine can be greatly reduced. 5. Structural type: (1) The reverse thrust turbine flowmeter should be selected for the internal structure. Because the reverse thrust structure can keep the impeller in a floating state within a certain flow range, there is no contact point in the axial direction, and there is no end face friction and wear, which can prolong the service life of the bearing. (2) According to the pipeline connection method, the flowmeter has two types of horizontal and vertical installation. The horizontal installation and pipeline connection methods include flange connection, threaded connection and clamp connection. Flange connections are used for medium diameters; threaded connections are used for small diameter and high-pressure pipes; clip-on connections are only suitable for low-pressure pipe diameters; vertical installations are only threaded. (3) Selection according to environmental conditions, considering the influence of temperature and humidity. Natural gas metering should choose intrinsically safe explosion-proof turbine flowmeter. 6. Bearings: The bearings of turbine flowmeters are generally made of three types of materials: tungsten carbide, polytetrafluoroethylene, and carbon graphite. Natural gas measuring instrument bearings should be made of tungsten carbide. If you have other questions about flowmeters, please feel free to consult. The above is the whole content of this article. You are welcome to inquire about the flowmeter selection and quotation of our factory. 'Factors to Consider in the Selection of Gas Flow Meters'

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