Selection of Differential Pressure Gas Flow Meters

Abstract: The selection information of the differential pressure gas flow meter is provided by the excellent flow meter and flow meter manufacturers and quotation manufacturers. Measurement Device and Application Selection of Differential Pressure Gas Flowmeter Its usage in the instrument. More flowmeter manufacturers select models and price quotations. You are welcome to inquire. The following is the selection article of differential pressure gas flowmeters. The selection of differential pressure gas flowmeters for measuring devices and applications Hu Haiyan (Measuring Station of Shengli Oilfield Hekou Oil Extraction Plant Technology Testing Station, Shandong Hekou Differential Pressure Gas Flowmeter is the most widely used type of gas flowmeter, and its usage ranks first among all kinds of flowmeters. Taking the flowmeter, V-cone flowmeter and precession vortex flowmeter as examples, it introduces how to select the differential pressure gas flowmeter and the problems that should be paid attention to in the selection. Differential pressure gas flowmeter; selection; instrument performance Natural gas is transported by pipelines under pressure, and its flow is based on a certain cross-section of the pipeline. The amount of natural gas transported between the supply and demand sides is determined by the measurement data of the flow measuring device installed on the gas pipeline. This Flow measurement data is also an important basic data for measuring the technical level of a unit of production. Accurate natural gas flow measurement is a key part of economic analysis and reduction of operating costs for enterprises, which directly affects the economic benefits of enterprises, and has attracted much attention from both supply and demand. With the increasingly tight energy supply and demand in the world, people are very concerned about and seek a flowmeter with high accuracy and strong adaptability to measure the flow of natural gas. However, there are still many types and different performances. Before the 1950s, the differential pressure flowmeter was the most popular natural gas flowmeter, accounting for about 50% and 60% of the total flow meter. About 40%. It is an instrument that measures flow according to the differential pressure generated by the flow detection piece installed in the pipeline, the known fluid conditions and the geometric dimensions of the detection piece and the pipeline. It has a long history of application, rich practical experience and mature, standard It is a type of flowmeter with complete specifications (except for the uniform velocity tube), and it also has the advantages of simple structure, durability, strong versatility, low cost, and standard throttling parts do not require actual fluid calibration. There are also many shortcomings. It requires high on-site installation conditions and requires a long straight pipe section. The accuracy of the entire set of flowmeters also depends on the accuracy of the differential pressure transmitter and flow indicator. It is a process from design, manufacture to installation and use. Instruments with very strict requirements will produce large errors in any link; in addition, the output signal of the differential pressure flowmeter has a square relationship with the flow rate, which is a nonlinear instrument with a narrow range; large pressure loss is also one of its weaknesses. In view of the above deficiencies, domestic manufacturers have introduced a series of improvement measures in recent years, such as integrated differential pressure flowmeters, fixed-value throttling parts, replaceable orifice throttling devices, standard nozzles, etc. The two components of pressure flowmeters: differential pressure transmitters and flow indicators have made outstanding progress, and it is estimated that such flowmeters will still occupy an important position in the future. Meter, V-cone flowmeter, and precession vortex flowmeter are three representative new flowmeters, all of which belong to differential pressure flowmeters. 2 Differential pressure flowmeter classification There are many types of differential pressure flowmeters. According to different classification methods, they can be divided into three categories and 20 types. The specific classification is shown in Table 1. Table 1. Classification of Differential Pressure Flowmeter Classification Principle Classification Type Throttling; Dynamic Head Type; Classification according to the action principle of (3) Hydraulic resistance type that generates differential pressure (4) Centrifugal type; Dynamic pressure Gain jet standard orifice plate; standard nozzle; classic venturi tube; venturi nozzle conical inlet orifice plate; 1/4 round orifice plate; plate; integral (built-in) orifice plate; linear orifice plate; annular orifice plate; Doyle tube; Rollos tube; elbow; replaceable orifice plate throttle device; critical flow throttle device Hu Haiyan (1979—) female, Shandong Zhanhua, engineer, graduated from China University of Petroleum, engaged in measurement technology. Continued table Classification principle Classification type Standard throttling device; Low Reynolds number throttling device; Dirty flow throttling device; Throttling device 3 Differential pressure flowmeter selection With the development of science and technology, there are many new flowmeters emerging. However, because the natural gas flow measurement technology itself involves a wide range, different objects have different requirements for the flowmeter, that is to say, objectively, a variety of flowmeters coexist.In order to meet the requirements of different levels and occasions. Different types of flowmeters have different instrument characteristics and fluid characteristics, and require different installation and use conditions. Each flowmeter has its own scope of application and limitations. Considering various factors, when choosing an instrument, you must be familiar with the measured object, instrument performance, measurement environment and other aspects.

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