Saturated steam vortex flowmeter

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1. Vortex flowmeter | Several factors affecting accuracy

The factors affecting the accuracy of vortex flowmeters mainly include the following: Saturated steam dryness: When measuring saturated steam with a vortex flowmeter, its dryness is required to be no less than 85%. In actual working conditions, the dryness of saturated steam in the boiler is already below 100%, which may further decrease to below 85% after pipeline transmission, resulting in a decrease in measurement accuracy. Measuring pipeline flow velocity: Uneven flow velocity or fluid distribution inside the pipeline can cause measurement errors. For example, solid particles carried in gas may form sediments, and non streamlined objects may be corroded by corrosion chambers, requiring the installation of filters in front of pipelines. When there is liquid carried in the gas or liquid sediment in the pipeline, a liquid removal device needs to be installed before the inlet of the flowmeter. For media that are prone to liquid deposition due to seasonal temperature, it is necessary to increase the dew point value through a heat tracing system to prevent liquid precipitation. Measuring pipeline vibration: The vibration of equipment or pipelines can interfere with the measurement accuracy of vortex flowmeters. When installing, try to avoid vibration sources as much as possible. If it is necessary to install in a vibrating environment, anti vibration brackets should be installed in front and behind the instrument to reduce the impact. Vortex generation body contamination in flow meters: Dirt or entanglement in the medium may alter the geometric dimensions of the vortex generation body, causing changes in the flow coefficient and affecting measurement accur

acy. During use, it is necessary to regularly clean the object and keep its surface clean. Flow meter installation: Vortex flow meters have clear requirements for the front and rear straight pipe sections. If they do not meet the standards, it may affect the correct formation of the Karman vortex principle and lead to deviations in saturated steam measurement values. For gases or vapors that require temperature and pressure compensation, if a split type vortex flowmeter is used, attention should be paid to the fluid flow direction when installing temperature and pressure instruments to avoid vortex interference with measurement. In addition to the above factors, changes in pipeline pressure and improper selection of flow meters may also affect measurement accuracy. For example, pressure fluctuations may cause changes in fluid density, while incorrect selection may result in a mismatch between the flow meter range and actual operating conditions. Therefore, in the process of scheme formulation, selection, installation, use, and maintenance, these factors need to be comprehensively considered to ensure measurement accuracy.

2. What are the differences between vortex street and turbine flowmeter?

The difference between a vortex flowmeter and a turbine flowmeter mainly lies in their working principle, applicable medium, cost, and application scenarios, as follows:

1. Differences in working principle. Vortex flowmeter: When fluid flows through non streamlined obstacles, periodic vortices (vortex streets) will form behind the obstacles.

. The vortex frequency is directly proportional to the fluid velocity, and the flow rate can be calculated by measuring the frequency. The formula is: f=Kv, where f

1. Vortex flowmeter | Several factors affecting accuracy

2. What are the differences between vortex street and turbine flowmeter?

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