Correctly choose the secondary instrument that is matched with the orifice flow meter

Abstract: The information on the correct choice of the secondary instrument that you want to match with the orifice flow meter is provided by the excellent flow meter and flow meter manufacturers and quotation manufacturers. Standard orifice flowmeter is widely used in pipeline measurement due to its simple structure, convenient operation and mature technology. of. For more flowmeter manufacturers to select models and price quotations, you are welcome to inquire. The following are the details of the article on the correct selection of the secondary instruments that you want to match with the orifice flowmeter. Standard orifice flowmeter is widely used in pipeline measurement due to its simple structure, convenient operation and mature technology. of about 50%. In order to standardize orifice flow measurement, the country has specially formulated GB2628 and SY/T 6143 measurement standards, which describe and require the measurement system. At the same time, the guideline for the equipment of natural gas station instruments has also been issued, and the accuracy level of the instrumentation of the measurement system is required. . However, due to the structural characteristics of the metering system of the orifice flowmeter, it is determined that two kinds of errors will occur, one is the basic error, which is the error existing in the flowmeter itself, and the second is the additional error, which is due to the fact that the flowmeter is in use. Deviations from standard conditions are produced. Since there are many manual operations, and the measurement of natural gas is a continuous and non-repeatable measurement, if it is not monitored in time, the additional measurement error will be quite large, especially when natural gas is used as a commodity for trade settlement. This paper analyzes the main reasons for the error, and puts forward corresponding rectification measures. Mainly for the selection of secondary instruments, some suggestions are made. Correct selection of matching instruments (1) The production of standard orifice throttling devices for measuring natural gas flow should meet the standard requirements, and the model, accuracy and range of matching pressure, differential pressure and Pt100 platinum thermal resistance should be consistent with on-site working conditions. Matching, especially the flow totalizer or computer system supporting software and measurement model, should be equivalent to the calculation formula of the SY/T6143-2004 standard, or the latest version of AGA Report No.3. (2) The measuring range (range ratio) of the orifice flowmeter is narrow, generally 3:1 or 4:1, but it can be used in the aperture ratio of 0:1≤β≤In the range of 0:75, the range can be expanded by adjusting the inner diameter of the standard orifice plate. But to choose a pressure and differential pressure transmitter with a wider range ratio, the intelligent totalizing system can input the components to calculate the C value in real time. (3) The requirements for on-site installation conditions are high, and it is often unable to meet the needs of a wide range of gas transmission and distribution measurement in the natural gas pipeline network. Factors such as wear and scaling on the acute edge of the orifice plate will affect the measurement accuracy. Plates need to be checked and cleaned frequently. Ancillary equipment for measuring natural gas flow and standard orifice plates, pressure and differential pressure transmitters, temperature transmitters and gas chromatographs for custody transfer metering needs to be verified on time. .. 3.3 Using foreign advanced technology to speed up the development of new flow meters Natural gas is an increasingly important one-time energy source in the 21st century. In the international trade of natural gas, energy measurement has almost completely replaced traditional volume measurement, while my country still uses natural gas volume measurement Way. In order to be in line with international standards as soon as possible, it is imperative to introduce, digest and absorb the new natural gas measurement technology developed in recent years. The user unit can jointly tackle key problems with various scientific research institutes and carry out the test work of natural gas energy measurement, and on this basis, speed up Standardized construction pace of technical equipment, measuring instruments and calculation methods. In order to speed up the progress of test development, it is suggested to introduce foreign advanced on-line gas chromatography system and flow computer, and develop a natural gas energy metering system suitable for my country's national conditions on the basis of digesting the imported technology. .. 4 Conclusions There are many factors affecting the measurement error of the flowmeter, such as the influence of the composition of natural gas, the influence of the roughness of the pipeline, and the different measurement methods of upstream and downstream users. Therefore, it is not only necessary to solve the above-mentioned problems, but also to improve the technological process, strengthen the measurement supervision and inspection, improve the professional level of the measurement personnel, and be familiar with the provisions of the measurement laws and regulations and the measurement transfer agreement. Only in this way can the additional measurement error of the flowmeter be eliminated and the measurement accuracy of the standard orifice flowmeter be improved. The above is the whole content of this article. You are welcome to inquire about the flowmeter selection and quotation of our factory. 'Correct selection of the secondary instrument that is matched with the orifice flow meter'

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