Real Flow Calibration and Field Application of Gas Ultrasonic Flow Meter

Abstract: The real flow calibration and field application information of gas ultrasonic flowmeters are provided by excellent flowmeter and flowmeter manufacturers and quotation manufacturers. Abstract There are many factors affecting the accuracy of trade settlement in natural gas field. These effects cannot be controlled according to the requirements of metrology standards, such as the effects of air conditions or installation conditions. So some new flowmeters (such as ultrasonic flowmeters) will be used. For more flowmeter manufacturers to select models and price quotations, you are welcome to inquire. The following are the details of the actual flow calibration and field application of gas ultrasonic flowmeters. Abstract There are many factors affecting the accuracy of trade settlement in natural gas field. These effects cannot be controlled according to the requirements of metrology standards, such as the effects of air conditions or installation conditions. So some new flowmeters (such as ultrasonic flowmeters) have come into being and have been tested at the calibration station. It is proved that the measurement accuracy of ultrasonic flowmeter can be better than±0.5%, has the characteristics of high accuracy, good repeatability, wide range ratio, strong anti-interference ability, small maintenance, and can measure bidirectional flow. At present, the orifice flowmeter is the main method in China's natural gas metering system. As we all know, the orifice flowmeter consists of a throttling device, a pressure guiding pipeline system, and a differential pressure gauge. It is characterized by small range ratio, large pressure loss, very sensitive to pulsating flow, and cannot measure bidirectional flow. Although the orifice flowmeter has a history of hundreds of years, due to the error of the metering instrument (the design, manufacture, installation and use conditions of the throttling device do not meet the requirements of ISO5167-1 [1], or the instrument is improperly selected) and changes in the use conditions The resulting errors (for a long time, the change of the flow rate exceeds the measurement range of the selected instrument, or the generation of pulsating flow), often the accuracy of the orifice flowmeter cannot be better than±1.5%. Although ISO/TR3313[2] has provided some data on the suppression of pulsating flow and error estimation for users to use as a reference, there are still many deficiencies to meet the needs of the field: ①The types of chokes in the field are far more than those provided in the standard and the combination of choke parts is ever-changing, so there are still some problems to be solved on site (such as cyclone separators and manifolds are not specified in the standard); ② experimental research requires a lot of manpower and material resources; ③ the use of rectifier tubes to Shortening the length of the straight pipe section will bring additional pressure loss, and will also increase the workload of use and maintenance. The orifice plate is not suitable for measuring the pulsating flow, because the differential pressure signal has a nonlinear relationship with the flow rate, the pressure pipeline makes the signal hysteresis and distortion, and the throttling piece obstructs the pulsating wave and forms the reflection of the wave [3]. Due to the above-mentioned factors affecting the trade settlement accuracy of the orifice flowmeter, the measurement error of natural gas transmission is more than 2%. How to improve and improve the accuracy of the natural gas metering system is a common concern of people in the industry, and a large number of new flow meters have been developed accordingly. Among many flowmeters, through the natural gas flow test and field application of the China Natural Gas Flow Metering Station (hereinafter referred to as the metering station), it is proved that the ultrasonic flowmeter and the intelligent precession vortex flowmeter have better effects and are worthy of promotion. Overview of Natural Gas Flow Metering Station China Petroleum Industry Natural Gas Flow Metering Station is the largest natural gas metering station in Asia, with a mass-time method (mt) primary standard system (the uncertainty of which is 0.1%) and a critical flow Venturi nozzle secondary Standard system (with an uncertainty of 0.25%). Calibration pressure range: 0.2 ~ 3.8MPa, calibration flow range: 5 ~ 6000m3/h. Pipe diameter range: DN25～DN400. So far, real-flow calibration and comparison of various flowmeters in the United States, the Netherlands, Germany, Singapore, China and other countries have been carried out, and tens of thousands of experimental data have been accumulated.

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