Problems with the use of vortex flowmeters
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The principle of the vortex flow meter allows it to measure both gases and liquids. The reason it is not recommended for measuring liquids is that fluctuations in flow rate can occur due to pressure at the pump outlet or vibrations; isn’t it possible to solve this by installing shock absorbers or mounting brackets in front of the flow meter? And why are there large fluctuations when measuring steam, resulting in inaccurate readings?
Vortex flow metering can be used for gases, steam, and liquids. The issues related to fluctuations are caused not only by pipe vibrations and fluctuations in the process medium itself, but also by other factors. For example, when measuring gases, fluctuations can occur if there is liquid present; similarly, fluctuations can also occur when measuring liquids with gas present. It is feasible to add shock-absorbing devices, or to install the flow meter at a distance from the pump outlet under certain conditions.
Vortex flowmeters are primarily used to eliminate square vibrations and interference; if fluctuations occur, it is necessary to check whether there are vibration sources at the installation location, electromagnetic interference, or whether the fluid flow is stable. We use vortex flowmeters to measure steam flow, and the results are quite stable and accurate...
Vortex street flowmeters can indeed measure liquids. Now, vortex street technology is no longer affected by vibrations. The main reason for not choosing vortex flowmeters is that electromagnetic flowmeters of the same diameter are cheaper, and they also have better corrosion resistance. Vortex flow meters are limited for small diameters and low flow rates. For non-conductive liquids such as pure water, vortex flow meters work very well. Vortex flow meters are the best for measuring steam!
Conductive liquids definitely give priority to electromagnets； Vortex flow meters are considered for use in non-conductive environments, but many recommend them not, stating that fluctuations occur as people walk back and forth and that they are not resistant to vibrations ； I consulted the manufacturer, and they said it’s possible – it’s shock-resistant ； I was also torn, but in the end I chose a rotameter and expanded the pipe diameter.
Vortex street. It is generally not recommended for small manufacturers, although vortex street technology is now quite mature. Saying that people walking back and forth have an impact is a bit excessive. When selecting vortex street sensors, it is essential to control the distance between them
Ultrasonic liquid measurement, liquid turbines, and porous orifice plates are also available as options. There is no need to be limited to vortex flowmeters and electromagnetic types.
That’s because you didn’t choose the right model; if you select Yokogawa DY or Rosemount, there are usually no problems
Vortex flow meters require straighter pipelines than electromagnetic and rotor-type meters; for the same diameter, vortex flow meters are generally more expensive than electromagnetic ones. It is more difficult to apply anti-corrosion measures to vortex flow meters, and their accuracy is also lower compared to electromagnetic meters, among other reasons. . .
Yokogawa’s vortex flow meters are earthquake-resistant; I’m not sure about other brands. Rotary flow meters have poor accuracy, are difficult to maintain, prone to getting stuck, and require a specific installation direction.