How to choose a natural gas flow meter

Abstract: How to select natural gas flow meter meter information is provided by excellent flow meter and flow meter manufacturers and quotation manufacturers. The first problem encountered in the use of natural gas flow meters is the problem of instrument selection. The selection of natural gas flowmeter is not an easy task, and there are many factors to be considered. Roughly: instrument performance, fluid characteristics, installation requirements, environmental conditions, and price. For more flowmeter manufacturers to select models and price quotations, you are welcome to inquire. The following is the details of the article on how to select natural gas flowmeters. The first problem encountered in the use of natural gas flow meters is the problem of instrument selection. The selection of natural gas flowmeter is not an easy task, and there are many factors to be considered. Roughly: instrument performance, fluid characteristics, installation requirements, environmental conditions, and price factors. Decisions can only be made after careful analysis and comparison. Once the decision is wrong, the entire measurement may fail. The exact understanding of the measurement object (that is, the actual condition of the fluid) is very important. It should be pointed out here that not users have an accurate understanding of their own measurement objects, and the selection designer often needs to conduct in-depth investigations to find out. In the design of the metering and regulating station of the urban gas system, which flowmeter should be selected, there are roughly the following aspects. For the metering personnel who have worked in the petroleum metering system for decades, for gas metering such as natural gas, they often choose the orifice plate natural gas flowmeter without thinking, thinking that this is a conclusion. But after in-depth analysis it became clear that the orifice plate was not suitable. Downstream of the city gas metering and regulating station are many scattered users, and some are even all residents. During the cooking time, everyone uses gas, and the flow is the largest, and basically no gas is used between two meals, and the flow is the smallest. It is definitely not suitable to use an orifice plate with a turndown ratio of 3:1 for such a large flow range, and it will not be measured when it is less than the minimum flow rate of the orifice plate. For example, the range of an orifice plate is 300 ~ 900m3/h, when only a few households are using gas and the gas flow is less than 300m3/h, the gas supply side will lose money. At present, orifice plate natural gas flowmeters are often used in the following occasions: ① In large-diameter occasions, when the diameter is greater than 600m, there is generally no other instrument to choose from, and only the orifice plate can be used; ② During the whole measurement process, the flow rate is relatively constant, and the flow fluctuation range is not Exceed the turndown ratio of the orifice plate of 3:1; ③Used for industrial monitoring and measurement, even if the fluctuation range is large, it can be covered by the range of a set of continuous orifice plates (more than ten pieces), and it does not care when replacing the orifice plate (refer to Advanced orifice valve that can change the orifice plate without production) that part of the natural gas leakage that is not metered. Another principle for oilfield personnel to select a flowmeter is to choose a flowmeter without moving elements, which is considered to be wear-free and durable. Therefore, consider choosing a vortex natural gas flowmeter. However, after analysis, it is believed that the application range of the vortex natural gas flowmeter is limited by the Strouhal number St (Re≥4000), that is, when the downstream of the metering and regulating station is at a small flow rate, the flow rate cannot meet the requirements, and the measurement cannot be accurate, so it is not suitable to choose a vortex natural gas flowmeter. As mentioned above, if the natural gas flow meter of the waist wheel gets stuck, it means that the gas source will be cut off, so the waist wheel cannot be used. The precession vortex natural gas flowmeter is not suitable for the pressure regulating station that calculates the pressure loss due to the large pressure loss (and the poor anti-interference ability of the domestic meter). In the end, the turbine natural gas flowmeter was selected, mainly using the advanced high-quality gas turbine natural gas flowmeter from abroad. It has a wide range, the measurement range can reach 15:1 to 30:1, and the measurement range can be increased under the condition of high pressure gas transmission; the pressure loss is small; the accuracy is not lower than level 1, which is affected by the change of the flow field Smaller than orifice flowmeters. In comparison, turbine gas flow meters are compact and small in size. Easy installation and low cost. Another notable feature is: pulse output, more convenient to use with computer. They all solve the problems of durable impeller bearings, resistance to dirty media, anti-interference, and minimal maintenance. For example, the bearings are made of Boeing aircraft engine bearing materials and are designed to be fully sealed, so that it is difficult for dirty media to affect the bearing parts. According to information, high-quality natural gas flow meters can be guaranteed to maintain the original accuracy after 8 to 15 years of use. According to the survey, in the natural gas industry in Europe and the United States, the turbine flowmeter is the second legal natural gas flowmeter after the orifice flowmeter, and has developed into a natural gas flowmeter with multiple varieties, multiple specifications, full series, and mass production. Its practical application is also second only to the orifice flowmeter. There are thousands of turbine flowmeters used in the natural gas industry in the Netherlands, and there are also a large number of applications in Russia. Standard specifications for gas turbine gas flow meters are also well established. In 1993, the International Organization for Standardization promulgated the international standard ISO9951 'Measurement of gas flow in closed pipelines'.———Turbine Flowmeters'; the International Organization for Legal Metrology (OIML) issued two international recommendations related to gas turbine flowmeters, R6 'General Specification for Gas Volumetric Flowmeters' and R32 'Rotary Piston Gas Flowmeters and Turbine Flowmeters'; The AGA7 report 'Measurement of Gas Flow with Turbine Flowmeter' issued by the United States has laid a solid foundation for the formulation of the above standards. In fact, after several years of practical application of foreign advanced flowmeters, we have achieved a better solution to gas measurement. Natural gas flowmeter, argon gas flowmeter, biogas flowmeter, flue gas flowmeter The above is the whole content of this article. You are welcome to inquire about the flowmeter selection and quotation of our factory. 'How to choose a natural gas flow meter meter'

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