Factors to be considered in the selection of gas flowmeter

It is an important step for customers to choose flowmeters for the site. It is necessary to comprehensively consider the actual working conditions of the site to choose the most suitable meter. Accuracy, but the higher the accuracy of the flowmeter, the more sensitive it is to changes in field conditions. Therefore, the choice of instrument accuracy should be carefully 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 with small transmission volumes, it is sufficient to use medium-precision instruments. 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 caliber of flowmeter has a certain measurement range, and the selection of the flowmeter caliber is also determined by the flow range . The principle of selecting the flow range is: the minimum flow rate during use should not be lower than the minimum flow rate allowed by the meter, and the maximum flow rate during use should not be higher than the maximum flow rate allowed by the meter. For intermittent working occasions where the actual daily running time of the instrument does not exceed 8 hours, select 1.3 times the maximum flow rate during actual use as the upper limit of the flow range; for continuous working occasions where the daily actual running time of the instrument is not less than 8 hours, select the actual 1.4 times the maximum flow when used as the upper limit of the flow range. The lower limit flow rate of the instrument is 0.8 times of the actual minimum flow rate. 3. Gas density: For gas flowmeters, the influence of fluid physical properties is mainly the gas density, which has a great influence on the meter coefficient, and it is mainly in the low flow area. If the gas density changes frequently, correction measures should be taken for the flow coefficient of the flowmeter. 4. Pressure loss: Try to choose a turbine flowmeter with small pressure loss. Because the pressure loss of the fluid through the turbine flowmeter is smaller, the less energy the fluid consumes from the input to the output pipeline, that is, the total power required will be reduced, which can greatly save energy, reduce transportation costs, and improve utilization. . Some people have done experiments. 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 and the cone, the pressure loss of the former turbine flowmeter can be substantially reduced. 5. Structural type: (1) The internal structure should use reverse thrust turbine flowmeter. 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, no end surface friction and wear, and the service life of the bearing can be extended. (2) Select the type according to the pipeline connection mode. The flowmeter has two ways of horizontal and vertical installation. The horizontal installation and pipeline connection methods include flange connection, thread connection and clamp connection. Flange connections are used for medium-caliber pipes; threaded connections are used for small-diameter and high-pressure pipes; clamping connections are only suitable for low-pressure pipe diameters; only threaded connections are used for vertical installations. (3) Select the model according to the environmental conditions, considering the influence of temperature and humidity. For natural gas metering, an intrinsically safe explosion-proof turbine flowmeter should be selected. 6. Bearings: The bearings of turbine flowmeters generally have three types of materials: tungsten carbide, polytetrafluoroethylene, and carbon graphite. Natural gas meter bearings should be made of tungsten carbide.

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