How should the flowmeter be positioned?
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The installation position of the flowmeter is not reasonable, and there will be a large error in the detection process. Due to the existence of choke parts in the pipeline installation, it will affect the flow rate of the fluid medium, so how to choose a reasonable distance to ensure that the detection is not affected by the flow meter installation is very important. At the same time, the choke also causes that the fluid medium cannot be filled with the pipe, and a large number of bubbles may be generated, which are all factors affecting flow measurement.
For example, three-way, elbow, all kinds of valves, variable-diameter (expansion or contraction pipe) are choke parts, will affect the flow rate of the fluid medium. The closer the fluid medium is to the baffle, the greater the influence on the velocity will be; the smaller the influence will be on the velocity of the fluid medium when it is far away from the baffle; when it is far away from a certain distance, the velocity of the fluid medium will return to a stable state. When close to the choke, the fluid medium fails to fill the pipe or bubbles are generated, which can not make the flowmeter work normally. Therefore, the distance between the flow meter and the choke is related to whether the flow meter can work normally.
1. electromagnetic flowmeter
Choke for the 90 ° elbow, tee, reducer, globe valves, etc., for flow meter with the choke a distance not less than 5 d, choke for various valves, both the distance of not less than 10 d.
2. VSF(vortex shedding flowmeter)
The flow arrestor is a elbow, the installation distance between the two shall not be less than 20D, the installation distance between two elbows in the same plane shall not be less than 25D, and the installation distance between two elbows in different planes shall not be less than 40D. If the diameter is concentric, the installation distance shall not be less than 15D; if the diameter is concentric, the installation distance shall not be less than 25D. If the choke is a regulating valve, the installation distance shall not be less than 50D.
This is just to say that there are two kinds of flowmeter installation process encountered flow arrester, flow meter and flow arrester between the rough choice of distance. There are other factors to be considered in the installation process, such as radiation source, heat source, strong vibration, strong electrical equipment, etc., will affect the normal operation of the flow meter.