In this article, we shall learn about Vortex Flow Meters.
A vortex train is generated when a bluff body is placed in a pipe stream containing liquid or gas. This train consists of high and low-pressure areas which can be measured by a specially manufactured sensor.
Vortex flow meters measure fluid velocity using a principle of operation referred to as the von Kármán effect, which states that when flow passes by a bluff body, a repeating pattern of swirling vortices is generated.
In a Vortex flow meter, an obstruction in the flow path, often referred to as a shedder bar, serves as the bluff body.
The shedder bar causes process fluid to separate and form areas of alternating differential pressure known as vortices around the backside of the shedder bar.
The number of formations of these vortices depends on the flow rate, if we measure these vortices we can get the equivalent volumetric flow rate.
Also Read: Types of Vortex Sensors
Vortex meters are commonly used in the following services:
Vortex meters have the following characteristics:
Vortex meters have the following limitations:
Vortex meters are installed directly in the process piping and are normally supported by the piping. They may be installed in any orientation. A vortex meter should be installed so that the meter body is not subjected to piping strain.
In liquid applications, the piping should be arranged so that the meter is kept full. Block and bypass valves should be provided when operating conditions do not permit shutdown.
Vortex meters are sometimes damaged during the start-up of new installations as a result of debris in the line. The line should be flushed and hydrostatically tested before the meter is installed.
Since the velocity profile is critical, it is imperative that gaskets not protrude into the flow stream when flanged meters are installed. Field calibration of vortex meters is limited to electrically spanning the converter or, on a pulse-output type, adjusting the scaling factor.
Vortex flow meters offer many advantages for flow measurement including easy installation without impulse lines, no moving parts to maintain or repair, less leak potential, and a wide flow turndown range. Vortex meters also offer very low power consumption, allowing for use in remote areas.
Additionally, Vortex meters are unique in that they can accommodate liquids, gasses, steam, and corrosive applications. Vortex flowmeters are also able to withstand high process pressures and temperatures.
Here we shall see which type of vortex meter to use in different operating conditions and services.
Interest to add any further points? Share with us through below comments section below.
Author: Kalpit Patel
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