Vortex flow meters for measuring steam and gases
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When using a vortex flowmeter to measure liquids, it is necessary to ensure that the flow tube is filled; it cannot be installed at the highest point, and when measuring liquids, it should be installed vertically with the liquid flowing from bottom to top. But for measuring steam and gases, isn’t the flow tube always filled regardless of how it is installed?
That’s right; if you can ensure that the tube remains filled with liquid at all times, it’s also possible to install it from top to bottom. In fact, it’s best to check the installation instructions provided by the specific manufacturer, as there may be differences among different manufacturers.
The gas should be at a higher level, right? When you got started, didn’t you look at the “Field Instruments” volume in the collection of instrument technician exam questions? :Lol, this is what we learn when we start out – things like center, online/offline 0-45°, front 7 back 8, front 10 back 5D and so on!
Yes, vortex flowmeters do not require a full pipe condition for measuring steam and gases. Steam and gases can completely fill the pipeline as they flow, so regardless of the orientation in which the vortex flow meter is installed, it can accurately measure the flow rate of the fluid. This is also one of the reasons why vortex flowmeters are widely used in industry for measuring steam and gases. .
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Yes, when measuring the flow of gases and vapors, vortex flow meters should be operated at full pipe capacity, regardless of the installation method. Because gases and vapors are compressed inside the pipe, there is no issue of liquid level height similar to that in liquids. When measuring gases and vapors, vortex flowmeters require that the cross-sectional area of the pipe remain constant; they should be installed 30 times the inner diameter of the pipe ahead of them, in order to ensure stable flow. Additionally, the pipe must be free of any foreign objects, bends, or contractions. When measuring liquids, since liquids are incompressible fluids, changes in flow velocity and variations in liquid level occur as they move through pipes. Therefore, vortex flow meters need to be installed with the pipe completely filled, ensuring that the surface of the meter is level with the liquid surface, and the inlet of the meter should be at a higher level than the outlet. If the flow meter is installed at too high a position, it can lead to missed measurements and loss of flow, as well as affect the accuracy of the flow meter. It is recommended that when choosing a vortex flowmeter for liquid measurement, one should thoroughly understand the installation requirements and applicable range of the flowmeter to ensure accurate measurement results.
With steam, there is the issue of condensation, and with gases, there is the problem of liquid accumulation; both can affect measurements, so it’s important to avoid these situations.