Orifice flow meter for gas and gas flow conditions of natural gas

Abstract: The gas quality and gas flow condition information of the orifice flowmeter meter is provided by the excellent flowmeter and flowmeter manufacturers and quotation manufacturers. The natural gas passing through the orifice flowmeter is purified natural gas, and the flow of the gas stream should be subsonic, stable or only change slowly with time. The airflow is a homogeneous single-phase Newtonian fluid. If the gas contains no more than 2% solids by mass. More flowmeter manufacturers choose models and price quotations. You are welcome to inquire. The following is the details of the article on the gas quality and airflow conditions of the orifice flowmeter. The natural gas passing through the orifice flowmeter is the purified natural gas, and the flow of the gas stream should be kept subsonic, stable or only change slowly with time. The airflow is a homogeneous single-phase Newtonian fluid. If the gas contains no more than 2% by mass of solid or liquid particles and is uniformly dispersed, it can also be considered as a uniform single-phase Newtonian fluid. Before the airflow passes through the orifice, its beam should be parallel to the axis of the pipeline, the airflow should be fully turbulent and without vortex, and the vortex angle at all points of the pipeline cross-section should be less than 2°That is, there is no vortex. Through the measurement survey, it is found that the gas flow conditions of about 50% of the measurement points in the natural gas measurement in the oil field have the following two characteristics. The gas flow is unstable and changes greatly and periodically with time, which is a pulsating fluid. Causes of pulsation sources [reciprocating compressors, engines, and vane superchargers; slamming of pressure regulating valves or loose and worn spools; irregular movement of a large amount of water or oil condensate in the pipeline. The gas has a large water content and entrains crude oil and trace particles of impurities. When the gas flows through the throttling device, condensate is generated. If the air quality and air flow conditions do not meet the requirements specified in the standard 'Measurement of Natural Gas Flow Rate with Standard Orifice Flowmeter', additional measurement errors will inevitably occur. In order to obtain accurate metering values, the pulsation of the air flow must be suppressed and the moisture and impurities in the air must be eliminated. The gas entering the orifice flowmeter must first pass through the gas-liquid separator and filter. Install the measuring tube in a position where it is advantageous to eliminate pulsation, such as at the inlet of the pressure regulating valve or away from the source of pulsation. In order to reduce the pulsation amplitude, a container can be added to the pipeline between the pulsation source and the measuring tube, or a special pulsation attenuator can be designed. Installing a throttle valve or restrictor between the pulsation source and the measuring tube of the sewage flowmeter is the most effective way to reduce pulsation, but the pressure drop of this method is too large and should not be used unless conditions permit. On the premise that the differential pressure remains high, a smaller measuring tube can be used, and the opening diameter of the orifice plate is basically unchanged. A gas-liquid separator with a certain volume is installed at the outlet of the pressure taking pipe before and after the flowmeter, so that the differential and static pressure signals entering the flowmeter can be separated and buffered before entering the metering device. The upstream and downstream pressure-guiding valves on the pressure-guiding pipeline should use large-diameter ball valves. In order to prevent the pressure-guiding pipe from freezing and blocking, the pressure-guiding pipe must be insulated, and heating compensation and heat preservation measures must be added. In the case of air pulsation at the measurement point of the open channel flow due to the downstream fluctuation source, the air flow pulsation at the measurement point can be reduced by adjusting the valve position of the valve on the downstream side of the flow meter (close down). Experiments have proved that the effect of controlling the pulsation of air flow by closing the downstream valve of the metering tube is very obvious. When this method is used in practice, it must be carried out under the condition of ensuring safe production. Experiments have proved that the above method can effectively suppress the pulsation of the air flow, eliminate the moisture and impurities in the gas, and reduce the additional measurement error of the flowmeter. The above is the whole content of this article. You are welcome to inquire about the flowmeter selection and quotation of our factory. 'Quality and Airflow Conditions of Orifice Flow Meter for Natural Gas'

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