Selection of City Gas Air Flow Meter

Abstract: The selection information of urban gas air flow meter is provided by excellent flow meter and flow meter manufacturers. Abstract: The characteristics of several commonly used urban gas air flowmeters such as volumetric air flowmeters, velocity flowmeters, orifice flowmeters and ultrasonic air flowmeters are summarized, and different types of air flowmeters are selected according to technical performance parameters. Gas user flow. For more flowmeter manufacturers to select models and price quotations, you are welcome to inquire. The following are the details of the selection article of urban gas air flowmeters. The characteristics of several commonly used urban gas air flowmeters such as volumetric air flowmeters, velocity flowmeters, orifice flowmeters and ultrasonic air flowmeters are summarized, and different types of gas users are selected according to technical performance parameters. Flowmeters are introduced. 1. Introduction Gas is a circulating commodity, and its trading activities are settled on the basis of the value measured by the measuring instrument. Selecting the appropriate measuring instrument. Ensuring the accuracy of measurement is a necessary condition for fair trade, which is important for users and It is very important for gas companies. 2. Types and characteristics of urban gas flowmeters Commonly used urban gas air flowmeters are: volumetric flowmeter (membrane gas meter, waist wheel flowmeter), velocity flowmeter (turbine flowmeter, precession vortex flowmeter, vortex flowmeter Street flowmeter), differential pressure flowmeter (replaceable orifice flowmeter) and air ultrasonic flowmeter. The characteristics of various types of flowmeters are as follows: ① The volumetric flowmeter has high measurement accuracy, but compared with other types of flowmeters, the volume is larger, and there is no requirement for straight pipe sections before and after the flowmeter. Among them: the membrane gas meter has a wide range ratio, small initial flow, light weight, low price, convenient production, installation and maintenance, small pressure loss, larger volume than other flow meters in the same flow range, and is often used for pressure Small and medium-sized gas flow measurement with low flow rate and large flow variation. Compared with the membrane gas meter, the waist wheel flowmeter has a small volume and a large flow, and a filter must be installed before the flowmeter. It is mainly suitable for the measurement of small and medium flow tender gas at medium and low pressure. ②The speed-type flowmeter has compact structure, high measurement accuracy, and requires straight pipe sections before and after the flowmeter. Among them: Turbine flowmeter has small pressure loss and high bearing wear resistance requirements. The precession vortex flowmeter has no mechanical moving parts, corrosion resistance, long service life and large pressure loss, and is suitable for the measurement of medium and high pressure gas flow. Vortex flowmeters have no mechanical moving parts and are often used for large and medium flow gas measurement. ③ The replaceable orifice flowmeter is a differential pressure flowmeter with simple structure and long service life, but the range ratio is narrow, and there are straight pipe sections before and after the flowmeter. ④ The air ultrasonic flowmeter measures the flow by using the propagation time difference of the forward and reverse ultrasonic pulses generated by the ultrasonic channel. This kind of flowmeter has high measurement accuracy, good repeatability, no pressure loss, wide range ratio, and can realize bidirectional flow measurement. It is suitable for medium and high pressure flow places and places where bidirectional measurement is required. Diaphragm gas meters, waist wheel flow meters and velocity flow meters are the most commonly used city gas air flow meters. Compared with the three, when the flow rate is small, the price of the membrane gas meter is the lowest, and the price of the speed type flow meter is the highest; but as the flow rate increases, this trend weakens, stays flat, and gradually appears the opposite trend. The volume of the three is gradually reduced. The imported flowmeter of the same type is compared with the domestic flowmeter: the range ratio is wide and the precision is high, such as the turbine meter 0.2Qmax produced by the Netherlands ISM company≤Q≤At Qmax, the accuracy is higher than 0.5%, but the price of imported flowmeters is also much higher. 3 Different types of gas user flow, meter selection The selection of gas flow meters is mainly considered from the following aspects: ① Whether the measurement medium, working pressure and environmental conditions match the selected flow meter. ② Whether the maximum and minimum gas consumption of the tender gas appliance is within the measurement accuracy range of the flowmeter. ③ Whether the price-performance ratio of the flow meter is the best. ④Whether the flowmeter is easy to install, repair and maintain. The following is a brief introduction to the selection of different types of gas user flowmeters from the selection of technical performance parameters. 3.1 Residential users and public building users who are small, but have large changes in the flow of children 3.1.1 Residential users have a large number of residential users who supply gas from the pipeline network, with low operating pressure and small flow range. Generally, the maximum flow rate is 2.5M3 / h or 4.0 m3/h Class B membrane gas meter for measurement. The minimum flow rates of these two types of membrane gas meters are 0.16m3/h and 0.025m31h respectively, and the initial flow rate is only a few dm3/h, which is very suitable for civilian users who often use small fires for cooking and bathing.

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