『Installation requirements for wedge flowmeter』Related information(clamp on meter|electromagnetic meter|venturi meterrotameter|orifice meter|ultrasonic flow meter|mass flow meter|coriolis mass flow meter|coriolis flow meter|magnetic flow meter|magmeter flow meter|magflow flow meter|mag meter flow meter|electromagnetic flow meter|vortex flow meter|turbine flow meter|thermal mass flow meter|thermal flow meter|rotameter flow meter)
Why cant a globe valve be directly installed on the front end of a wedge-shaped flowmeter? Wedge flowmeter is a flowmeter that utilizes the principle of conversion between dynamic pressure energy and static pressure energy: (throttling type) In the same closed pipeline, when the fluid flows rapidly and the velocity increases, its static pressure energy will be converted into dynamic pressure energy. So in the same closed pipeline, the higher the flow velocity, the lower the static pressure. By installing a throttling element in the fluid pathway to increase the flow rate of the fluid passing through it, a static pressure zone with different pressures will be formed before and after the throttling element. The square of the pressure difference (differential pressure) is proportional to the flow rate. By measuring the differential pressure and taking the square root, the flow rate value can be obtained. The throttling element of a wedge flowmeter is a wedge-shaped protrusion on the pipe wall, and the flow rate can be determined by measuring the pressure difference before and after the protrusion when the fluid passes through it. Due to the relationship between differential pressure and flow rate being obtained through experiments and calculations on the basis of a straight pipe section, its parameters are determined based on the fluid flow characteristics in the straight pipe. Installing elbows, tees, valves, insertion components, etc. at the front end of the flowmeter will affect the flow characteristics of the fluid, so a certain amount of straight pipe section must be left. The length of the straight pipe section of a wedge-shaped flowmeter is generally 5-20 diameter lengths, which can be found in the flowmeter manu
2. Installation method of wedge-shaped flowmeter
The installation of wedge-shaped flowmeter needs to be combined with pipeline layout, fluid characteristics and equipment requirements. The specific methods are as follows:
1. Installation direction and fluid flow direction: wedge-shaped flowmeter is usually equipped with front and rear measuring pipes, supporting horizontal or vertical pipeline installation.
. Vertical installation requirements: If the sensor is installed in a vertical pipeline without a grip, the fluid must flow from top to bottom to avoid measurement deviation caused by incorrect fluid direction. Precautions for liquid measurement: When measuring liquids, it is necessary to ensure that the differential pressure transmitter can smoothly eliminate bubbles. If bubbles accumulate, it may cause zero drift of the instrument, affecting measurement accuracy. Figure: Schematic diagram of fluid direction and differential pressure transmitter position when installed vertically2. Configuration of straight pipe section and pipeline requirements. Necessity of straight pipe section: Straight pipe sections need to be configured upstream and downstream of the sensor to eliminate the influence of eddy currents or uneven flow velocity distribution in the pipeline on measurement. Pipeline conditions: The inner wall of the straight pipe section should be smooth, clean, and free of attachments (such as rust, welding slag, etc.) to avoid impurities interfering with fluid flow. The length of the straight pipe section: The specific length needs to be determined based on the diameter of the pipeline, the size of the wedge-shaped element, and the process requirements (specific values are not pro
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