Application of Ultrasonic Flow Meter in Pipeline Engineering

Abstract: The application information of ultrasonic flow meter in pipeline engineering is provided by excellent flow meter and flow meter manufacturers. 1 Introduction Ultrasonic sewage flowmeter is a velocity-type flowmeter that uses ultrasonic pulses to measure fluid flow. It has entered the field of industrial production and measurement in China since the 1980s, and a large number of new products have emerged, becoming the main source of new flowmeters. . More flowmeter manufacturers choose models and price quotations. You are welcome to inquire. The following are the details of the application of ultrasonic flowmeters in pipeline engineering. 1 Introduction Ultrasonic sewage flowmeter is a velocity-type flowmeter that uses ultrasonic pulses to measure fluid flow. It has entered the field of industrial production and measurement in China since the 1980s, and a large number of new products have emerged, becoming the main source of new flowmeters. one of the varieties. 2 Working principle According to the working principle, it can be divided into the propagation velocity difference method and the Doppler method [1]. Because the products based on the Doppler method are rarely used and are mainly used for the measurement of multiphase fluids, I will not introduce them here. Mainly discuss the measurement of single-phase flow based on the principle of propagation velocity difference method. The propagation velocity difference method includes time difference method, frequency difference method and phase difference method. This paper mainly discusses the time difference method which is widely used. 3 Main Features Compared with traditional mechanical and electromagnetic flow measuring instruments, ultrasonic flow meters have many advantages [6]. a) The ultrasonic sewage flowmeter can be measured from the outside of the pipeline. As a non-contact meter, this type of meter has no pressure loss, does not change the flow state of the fluid, and can measure the original pipeline without any processing. b) The output signal of the ultrasonic flowmeter has a linear relationship with the measured fluid flow. c) The measurement results are not affected by the viscosity and conductivity of the fluid to be measured, and can measure non-conductive liquids (or gases). d) In the measurement of large diameter and large flow, the cost is basically independent of the size of the pipe diameter, which saves energy consumption. For other flow meters, the manufacturing cost will increase significantly with the increase of the pipe diameter. e) It is more suitable for the measured object under harsh conditions (high pressure, high viscosity, strong corrosion, volatile, explosive, radioactive medium, etc.), because the test piece does not need to be in contact with it, which brings great benefits and convenience. Of course, each product also has its shortcomings. The clamp-on ultrasonic flowmeter is more convenient for maintenance and replacement of its detection components. It does not need to be interrupted and does not affect the production operation. However, because it is measured outside the pipeline, and the number of channels is small , so its accuracy is lower than that of pipeline embedded; if it is pipeline embedded ultrasonic flowmeter, it is relatively troublesome to repair and replace, but the current product can achieve three-channel, four-channel or even more channels. , so the accuracy of the product will be higher. In addition, because the installation of the ultrasonic flowmeter requires a relatively large restriction on the front and rear straight pipe sections (the first 10D and the rear 5D), this will cause the measurement accuracy grade products to be used for custody transfer, especially when assembled into a skid, the volume of the skid will be relatively large, The cost of construction and transportation will be high. 4 Application in the Western Crude Oil Refined Oil Pipeline Project The Western Crude Oil Refined Oil Pipeline starts from Urumqi, Xinjiang Uygur Autonomous Region, passes through Xinjiang and Gansu provinces along the line, and ends in Xigu District, Lanzhou City. The western pipeline project consists of two parts, namely the refined oil pipeline project and the crude oil pipeline project, and the trunk line of the refined oil pipeline and the trunk line of the crude oil pipeline are laid in the same ditch [7]. The characteristics of the western pipeline project are that there are many sources of oil products, the oil products are complex, and the refined oil is transported in sequence. The UFM3030K/F pipeline embedded ultrasonic flowmeter is selected. It can avoid the influence of uneven wall thickness of the pipe on the measurement accuracy. In such a long product oil and crude oil pipeline project, especially when considering the main factors such as custody transfer, economic analysis and cost reduction, the measurement of flowmeters is particularly critical, which will directly affect the economic benefits of enterprises and users. Benefit. The installation and selection of ultrasonic sewage flowmeter is a relatively complicated work, which includes the type of medium to be measured, the performance parameters of the instrument, the type of transducer and its applicable scope, the basic functions of the converter, the channel setting and the Length requirements, etc., the following aspects should be done in the design process: a) Understand the actual situation and physical characteristics of the on-site measurement object, which is the premise of model selection. b) The signal processing unit should be suitable for installation in outdoor and explosion-hazardous places, and its explosion-proof and protection level should meet the site requirements. c) There should be a long enough straight pipe section before and after the transducer to ensure the required flow rate distribution of the fluid. Generally, the front straight pipe section is required to be more than 10D, and the rear straight pipe section is more than 5D, and the upstream 30D cannot install pumps, valves and other disturbances. equipment. When the transducer is installed on inclined and horizontal pipes, do not install it on the top or bottom,To avoid gas or impurities in the pipeline entering the measurement channel. The transducer is installed so that the ultrasonic propagation path passes through the center of the pipe. d) Select the type of transducer for the measurement object is gas or liquid. Generally, the frequency of the gas transducer is low (100~300kHz), and the frequency of the liquid transducer is high (1~5MHz). The products used in the western crude oil product pipeline are embedded in the pipeline, and are installed by welding with the process pipeline. Compared with the traditional flange mounting method, the welding method reduces leakage points and further improves the accuracy.

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