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What are the differences between vortex flowmeter and orifice flowmeter when measuring steam?
There are many differences between vortex flowmeter and orifice flowmeter when measuring steam, as follows: In terms of accuracy, orifice flowmeter: strictly calculate the flow rate according to the national standard calculation formula. For scenarios with strict requirements, such as heating stations, using orifice flowmeter can better meet the accuracy requirements.. Vortex flowmeter: using a simplified calculation formula to calculate flow rate, the accuracy is slightly inferior to that of orifice flowmeter. In terms of accuracy changes: Orifice flowmeter: The inner diameter is small, and the obtuse angle of the inner wall may change after prolonged use, or dust and pollutants may increase the wall thickness, affecting the calculation formula and directly affecting the accuracy. Vortex flowmeter: Over time, there may be occasional drift in accuracy and linearity, but it can be restored through recalibration. In terms of universality: Orifice flowmeter: It requires setting multiple parameters such as pipe diameter, wall thickness, material, Reynolds coefficient, etc., which have high professional requirements and are not very universal. It is generally used in heating stations and other places. Vortex flowmeter: with good accuracy and simplified calculation formula, it has low professional requirements and is more commonly used. In terms of range ratio: Orifice flowmeter: The range ratio is 1:3. Vortex flowmeter: The high range ratio can reach 1:15, and the measurable flow range is wider. In terms of pressure loss: Orifice flowmeter: It belongs to the nuclear flow device and has a higher pressure loss than vor
2. 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 sy
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