Use and Maintenance of Precession Vortex Gas Flow Meter

Abstract: The use and maintenance information of the precession vortex gas flow meter is provided by the excellent flow meter and flow meter manufacturers. 1 Introduction Precession vortex gas flowmeter is a kind of velocity flowmeter widely used in crude oil production, storage and transportation. Because it has no moving parts and has the function of temperature and pressure correction, it can measure the Standard flow of natural gas. More flowmeter manufacturers choose models and price quotations. You are welcome to inquire. The following is the details of the use and maintenance of the precession vortex gas flowmeter. 1 Introduction Precession vortex gas flowmeter is a kind of velocity flowmeter widely used in crude oil production, storage and transportation. Because it has no moving parts and has the function of temperature and pressure correction, it can measure the The standard flow value of natural gas has high cost performance and can meet the requirements of internal production, operation and management of enterprises. 2. Use on site Currently in petroleum and petrochemical systems, this type of flowmeter is mainly used in the following occasions: (1) It is used for the measurement of associated gas in the crude oil production process, and is mainly installed at the natural gas outlet on the upper part of the oil-liquid separator. After the separated natural gas is measured, it is mixed into the gathering pipeline and transported to the transfer station. Since the associated gas contains a certain amount of light hydrocarbons, carbon dioxide, water and other media, with the change of temperature and pressure, the above components in a saturated state will be condensed from the natural gas, and the content<At 15%, the measurement accuracy≤±Therefore, this flowmeter is widely used in crude oil production sites, accounting for 95% of gas flowmeters. (2) It is used for crude oil transfer, gathering and transportation stations, and natural gas storage and transportation measurement after being processed by oil-gas-water three-phase separators. In natural gas light hydrocarbons, carbon dioxide, water and other media content<5% of the case, the measurement accuracy≤±3%. (3) It is used for the measurement of natural gas consumption in the production boilers, hot water heating furnaces and other energy-consuming facilities of crude oil gathering and transportation stations. The steam and hot water generated by the above heating facilities are used as energy-carrying working fluids for heat tracing in crude oil storage and transportation. Keep warm. Because natural gas is relatively pure, the measurement accuracy is≤±2%. (4) It is used for the internal handover measurement of natural gas produced and domestic among the secondary units of the enterprise. Such as residential gas consumption in living areas, fuel metering in heating stations, etc., the accuracy≤±1.5%. 3 Principles and technical features Measurement principle of precession vortex flowmeter: The gas entering the flowmeter generates a vortex flow under the action of the vortex generator. Acceleration; when the vortex flow suddenly enters the diffusion section, due to the change of pressure, the vortex flow moves against the forward direction; in the precession region, the signal frequency is proportional to the flow rate, and the piezoelectric sensor of the flow sensor detects this The frequency signal is sent to the flow computer for processing together with the temperature and pressure signals detected by the temperature sensor and the pressure sensor fixed on the flowmeter shell, and finally the temperature, pressure and standard state (20℃, 101.325kPa) volume flow and other parameters. It is suitable for the measurement of high flow rate and low density fluids such as pipeline gas, natural gas, LNG compressed natural gas, and superheated steam. The currently used intelligent precession vortex flowmeters mainly have the following characteristics: (1) Turndown ratio≥1:15, the circuit adopts surface mount technology and has a compact structure. The large-screen LCD displays standard volume flow, standard volume total, temperature, pressure and battery capacity, with clear and intuitive display and easy reading. (2) Adopting high technology of micro-power consumption, both internal and external power sources supply power, the internal battery can be used continuously for five years, the power consumption of the whole machine is low, and it has explosion-proof function, which can be used in the oil and gas gathering and transportation station warehouse. (3) Using high-performance microprocessor and modern filtering technology, the software has powerful functions and superior performance; it has 485 communication and (4-20) mA analog and pulse signal output, which is convenient for centralized control and automatic management. (4) The unique dual sensor and circuit processing technology is used to effectively solve the interference of pressure fluctuation and mechanical vibration to this type of flowmeter, and the measurement is accurate and reliable. It integrates temperature, pressure, flow sensor and flow computer, which can automatically track and correct the temperature, pressure and compression factor of the measured gas, and directly measure the volume flow and total amount of gas under standard conditions. (5) No mechanical moving parts, good stability, less maintenance, low requirements for straight pipe sections (front≥5DN, after≥3DN). (6) When the use and maintenance meet the installation technical requirements, there is basically no maintenance, so the flowmeter should try to avoid vibration, strong magnetic field and interfering components (such as compressors, separators, pressure regulating valves, large and small heads) as far as possible. and manifold, elbow, etc.), the measurement medium should be as pure single-phase fluid as possible. 4 Technical requirements and error control≤The actual, ΔP of the flowmeter below DN100 is 15% of the working pressure, which is a non-energy-saving instrument. At the same time, the following problems should be avoided in use. (1) The measurement medium should be a single Newtonian body as much as possible. If there are many impurities in crude oil and trace particles, a separation and filter should be installed before the flowmeter, otherwise the measured value will be larger than the actual value.

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