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1, leak. Leakage may occur at the connection point of the process piping, the valve, and the seal of the pump, causing air to enter the liquid process medium. There may also be air in the population of the system. Check the system for leaks and fix leaks found.
2, cavitation and flash phenomenon. When the system is at or near the evaporation pressure of the process liquid medium, causing air bubbles to enter the process liquid, cavitation and flashing occur. If the sensor is in close proximity to a device (such as a regulator) that produces a pressure drop, installing the sensor upstream of the device can reduce the chance of flashing. Alternatively, increasing the back pressure downstream of the sensor can also reduce the occurrence of cavitation and flashing phenomena. This is the reason why the orifice flowmeter should be used to ensure that the pressure before and after the throttle is within 0.75 when it is used in the field.
3, the high point in the system. When measuring liquids, air bubbles (non-condensing bubbles) are collected at the height of the system. If the flow rate of the liquid is low and/or the high point is very high relative to the system, the carried air bubbles will grow and remain. If the air bubbles mix with liquid and pass through the sensor, measurement errors occur. A possible solution is to install the purge valve (for non-hazardous gases) or the getter (for hazardous gases) at the point of the system, upstream of the sensor, depending on the condition of the device and the procedure.
4, splash flow. When the liquid flow rate is reduced to only partially filled with the sensor tube, there will be "splashing." This phenomenon is usually caused by the liquid flowing down to a vertical pipeline installed on the In order to rule out this situation, the liquid should flow from the bottom up to the vertically mounted sensor.This is why the throttling device (orifice flowmeter) is installed, if it encounters any vertical installation, the process allows it. Next, try to choose the flow from bottom to top.
Throttle device to measure the application of two-phase flow
Key words: throttling device, two-phase flow, sensor orifice flowmeter has been in the field of measuring the flow of two-phase flow in the fluid has been a hundred years of history, its measurement advantages and characteristics have been described in detail in the previous article, Here today, we will give you a brief introduction of the main locations of the two-phase flow generated at the process site: