Application of throttling device to measure two-phase flow

Abstract: The application information of throttling device to measure two-phase flow is provided by excellent flowmeter and flowmeter manufacturers. Keywords: throttling device, two-phase flow, sensor orifice plate flowmeter has a history of hundreds of years in field measurement of two-phase flow fluid. Its measurement advantages and characteristics have been introduced in detail in the previous article. Here today, for everyone. More flowmeter manufacturers choose models and price quotations. You are welcome to inquire. The following is the application article details of the throttling device to measure two-phase flow. Keywords: throttling device, two-phase flow, sensor orifice plate flowmeter has a history of hundreds of years in field measurement of two-phase flow fluid. Its measurement advantages and characteristics have been introduced in detail in the previous article. Today, I will introduce to you the main places where two-phase flow occurs in the process site: 1. Leakage. Leaks can occur at process line connections, valves, and pump seals, allowing air to enter the liquid process medium. Air entry is also possible at the population of the system. Check for leaks in the system and repair those found. 2. Cavitation and flash evaporation. Cavitation and flashing occur when the system is operating at or near the evaporation pressure of the process liquid medium, causing air bubbles to enter the process liquid. If the sensor is in close proximity to equipment that produces a pressure drop, such as a regulating valve, installing the sensor upstream of the equipment can reduce the chance of flashing. Alternatively, increasing the back pressure downstream of the sensor can also reduce the occurrence of cavitation and flashing. This is the reason why the orifice flowmeter should pay attention to the pressure before and after the throttling part to ensure that the pressure is within 0.75 when the orifice flowmeter is used in the field. 3. The high point in the system. When measuring liquids, entrained air bubbles (non-condensable air bubbles) are collected at high points in the system. If the flow rate of the liquid is low, and/or the high point is very high relative to the system, the entrained air bubbles will grow and persist. If air bubbles get into the liquid and pass through the sensor, a measurement error occurs. A possible solution is to install a bleed valve (for harmless gases) or an aerator (for harmful gases) at the point of the system, upstream of the sensor, according to the situation and regulatory requirements of the installation. 4. Splash”. Occurs when the flow rate of the liquid is reduced to only partially fill the sensor's tube“splash”Phenomenon. This phenomenon is usually caused by the flow of liquid down to a sensor mounted on a vertical line. To rule this out, the liquid should flow from the bottom up to the vertically mounted sensor. This is why when the throttling device (orifice flowmeter) is installed, if it is installed vertically, if the process allows, try to choose the flow direction from bottom to top. The above is the whole content of this article. You are welcome to inquire about the flowmeter selection and quotation of our factory. 'Application of throttling device to measure two-phase flow'

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