【Weekly Question 20090817】How to choose instruments for such operating conditions
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This post was last edited by stevenyjz on 2009-8-18 at 14:56. Flow measurement is required on-site; the medium is relatively clean. The measurement point is located below the equipment tower, with a short straight pipe section – at most 3D in front and 1D behind it. There is a valve behind the measurement point. Based on process calculations, the pressure loss at the measurement point can be only 5 KPa. Please share your ideas and discuss what kind of instruments would be appropriate to use under such operating conditions.
Use a turbine; turbines don’t have high requirements regarding the straight sections before and after them, and they also have strong resistance to interference – ensuring that the pipe is fully filled is sufficient
Throttle devices must not be used; electromagnetic or other types of instruments should be employed instead
There are many types of such flow meters that do not require throttling. Some devices have completely removed the orifice plates. However, I haven’t used my device yet.
It is recommended to use an electromagnetic flowmeter; such meters generate no resistance, and the key factor is the properties of your material
For material cleaning, a turbine type can be used; for cleaning that does not require such thoroughness, an electromagnetic type is suitable. A throttle type is not recommended due to its high pressure drop
Ross Monte 405: A compact panel-mounted unit with an integrated valve assembly that allows for the direct installation of differential pressure transmitters. Ideal for handling liquids, gases, and water vapor. The accuracy is ±0.5% due to the uncertainty in the flow coefficient. It meets ANSI 600# standards in terms of direct installation capabilities. It features a self-centering alignment ring; models 405C and 405P come with carefully designed panels
or using a T-type Anuba results in lower pressure loss.
Heavy medium characteristics: “clean”; installation conditions: “3D first, 1D later”; process requirements: “pressure loss”
Positive displacement flowmeters are generally used; turbine flowmeters and elliptical gear flowmeters are the best choices. 1# stevenyjz
The fellow forum members upstairs have already been introduced. Although the medium is relatively clean, as long as it is a conductive medium, an insert-type electromagnetic flowmeter can be used, which fully meets the requirements mentioned by the original poster ； If the dielectric constant of the medium is relatively low, a turbine flowmeter can be used, as it has lower requirements.