Collection of Standard Orifice Flow Meters for Measuring Natural Gas Flow

Abstract: Standard orifice flowmeters measure natural gas flow method collection information provided by excellent flowmeter and flowmeter manufacturers and quotation manufacturers. 1. Natural gas flow measurement method my country's natural gas measurement is usually expressed in volume, and the legal unit is cubic meters. my country stipulates that the standard state of natural gas flow measurement is: the absolute pressure is 0.101325MPa, and the temperature is 23.15℃. There are many ways to measure natural gas flow. More flowmeter manufacturers choose models and price quotations. You are welcome to inquire. The following is a collection of articles on the method of measuring natural gas flow with standard orifice flowmeters. 1 Natural gas flow measurement method my country's natural gas measurement is usually expressed in volume, and the legal unit is cubic meters. my country stipulates that the standard state of natural gas flow measurement is: the absolute pressure is 0.101325MPa, and the temperature is 23.15℃. There are many natural gas flow measurement methods, and there are many flow meters available. According to the working principle, they are roughly divided into three types: differential pressure flowmeter, positive displacement flowmeter, and velocity flowmeter. In terms of measurement standards, at present, most national measurement standards in the world are gradually moving closer to IS05167 'Measuring the flow of fluids filled with circular tubes with orifices', and my country's natural gas measurement standards have also been revised to SY/T6143-1996 'Standard orifice measurement of natural gas flow method'. 2 Overview of automatic measurement of orifice flowmeter The so-called automatic measurement is to use the transmitter to detect the temperature, pressure, pressure difference and other parameters involved in the measurement of natural gas flow in real time. Through the flow calculation software in the computer, the whole flow measurement process is realized. Natural gas flow measurement without human involvement. With the development of measurement technology and the popularization of computer use. There are many schemes to realize the automatic measurement of orifice flowmeter. At present, there are mainly the following four modes. 2.1 Single-variable transmitter + flow computer (or industrial computer) use single-variable analog transmitter to detect temperature, pressure and differential pressure respectively, and convert the detected electrical signal into a standard 4-20MA analog signal and send it to the flow computer The data acquisition card (or industrial computer) is converted into digital quantity through A/D, and the instantaneous flow, cumulative flow and other auxiliary functions of natural gas are calculated by the flow calculation software on the flow computer (or industrial computer). This method is a traditional automatic metering mode. The disadvantage is that the acquisition and transmission are analog signals, and the anti-interference ability is poor. Due to problems such as signal conversion, it is difficult to improve the measurement accuracy, and the hardware is complex, there are many intermediate links, and the reliability is poor. It can be expanded to: single variable transmitter + flow computer + industrial computer, so as to realize the separation of flow calculation and display, and improve the reliability and visibility of the system. 2.2 Multi-variable transmitter + flow computer (or industrial computer) uses a multi-variable intelligent transmitter to simultaneously detect temperature, pressure, differential pressure, etc. After the data acquisition card is installed, the instantaneous flow, cumulative flow and other functions of natural gas are calculated through the flow calculation software. In this way, the hardware connection is simplified a lot, and the reliability and measurement accuracy of the system are improved. However, since the transmitter only detects the measurement signal and does not process data, it must be calibrated together with the flow computer during calibration. The main difference between using a flow computer or an industrial computer is the flow calculation part. The flow computer is a special firmware to realize calculation and data storage, which is relatively stable and reliable, and has a high degree of trust; the software calculation on the industrial computer is generally developed independently, which is convenient for software upgrade and system maintenance. Due to the large amount of calculation, especially when multi-channel metering, Reliability is slightly worse. In order to increase the reliability of the system and the intuitive operation interface, this method can also be extended to: multivariable transmitter + flow computer + industrial computer, that is, the flow calculation is realized in the flow computer, and the display is realized on the industrial computer. 2.3 Multi-variable intelligent transmitter + industrial computer Compared with mode 2, the main difference is that the flow processing software is solidified in the transmitter, so that the transmitter can display the instantaneous measurement parameters and calculate the instantaneous flow on the spot, and pass the digital signal Transmission, into the industrial computer display and to achieve other auxiliary functions. The measured flow value must be processed twice on the industrial computer to realize the function of data accumulation and storage. In this way, the system structure is further simplified, and the transmitters can be calibrated individually or jointly, which is easy to maintain. However, due to the accumulation and storage of traffic in the industrial computer, the reliability is poor, and it is easy to cause data loss. 2.4 Integrated intelligent instrument + industrial computer The integrated intelligent instrument is mainly used to realize the integration of transmitter and flow computer. Not only the self-contained database can realize the display of instantaneous parameters and flow, and the reproduction of accumulated flow and historical data; but also in the operation of the instrument, a variety of power supply methods are adopted: internal battery pack, solar energy and external power supply, etc. In the case of no power supply, it can independently form a metering system,In-situ display of natural gas instantaneous flow, cumulative flow and data storage, reproduction, etc.; under normal circumstances, it can be connected to the host computer through the field bus to implement digital signal transmission and upload display, and it can also implement secondary data processing on the industrial computer. The system is more flexible and reliable. In this way, the worry-free measurement data is realized, making the system simple in structure, simpler in operation, more reliable, and easier to maintain; not only single schools but also joint schools are possible.

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