Flow meter selection

For the accurate measurement of flow rate in half-pipe conditions, you may need to consider using a specialized flow meter, such as a turbine flow meter or an vortex flow meter, as these meters can provide relatively accurate readings in such scenarios. 1. Turbine flow meter: A turbine flow meter determines flow rate by measuring the rotational speed of the turbine blades as liquid or gas passes through them. They are very effective for measuring half-pipe flow within a certain range. 2. Vortex flow meter: A vortex flow meter measures flow rate by utilizing the vortex vibrations that occur when fluid flows past the vortex sensor. They can also be applied to the case of semi-pipe flow. When selecting an appropriate flow meter, factors such as pipe size, fluid properties, accuracy requirements, and environmental conditions need to be taken into account. It is best to consult a professional flow meter supplier or engineer to ensure that the selected model meets your specific requirements. The accuracy and performance of flow meters depend on various factors, including flow rate range, pressure, temperature, etc.; therefore, it is necessary to carefully evaluate and select the appropriate type of flow meter. .

This post was last edited by sun_fm on 2023-10-13 08:25. Metal pipes? Self-flow/overflow? Can it make a U-turn? Or local necking? If possible, an electromagnetic flowmeter should be given priority. It is very difficult to measure the flow rate when the pipe is not full; therefore, one should first find a way to fill the pipe, and then consider the installation requirements (such as straight sections of pipe)

There is some information available online that can serve as a reference for this approach: the non-full-pipe electromagnetic flowmeter, the DN500 semi-pipe sewage flowmeter. A non-full-pipe flowmeter consists of a flow velocity sensor, a level sensor, and a flow display unit; it continuously measures the flow velocity and liquid level of the fluid in the pipeline. Users only need to enter the inner diameter of a circular pipe or the width of a square pipe, and the non-full-pipe flowmeter will automatically calculate the flow rate in the pipe, as well as displaying various measurement parameters such as the instantaneous flow rate, flow velocity, and cumulative flow.

Ask the manufacturers of electromagnetic flowmeters if they have models that can measure the half-pipe level; in other words, models that, in addition to measuring flow rate, also include a sensor for measuring water level. For generally sealed DN450 pipelines, necking or U-bends are generally not recommended in the design process, as they will cause pressure drops; this can be taken into account before designing the pipeline.

A mass flow meter can also be considered; it is relatively expensive. I’m not familiar with half-pipe flow meters; if the manufacturer can provide them, then they would be quite suitable