Regarding the installation locations of flow meters and valves
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Under normal circumstances, flow meters are installed in front of valves, as valves represent a form of resistance and also an unknown factor. It’s not rigorous to have it sandwiched between tests. So, if the flow meter is installed behind the valve, how much of an impact will that have on the test results? And what factors affect the test results? I hope the teachers can provide an answer
It’s better to test it in front of the valve; this way, the results will be more accurate
Flow meters should generally be installed upstream of the control valve; if installed downstream, the flow meter must meet the requirements for a straight pipe section.
Could the teacher specify what the requirements are? And then, if the requirements are not met, what extent of error will it cause in the experimental results?
I know that; my flowmeter’s pressure rating is not sufficient at the moment. The flow meter will get damaged if installed in front. If it’s placed behind the valve, it should work more or less, but I’m not sure what impact it will have on the experimental results
Typically, flowmeters require straight pipe sections before and after them, such as 20 units in front and 5 units behind; if these requirements set by the manufacturer are met, there should be no problems
It can be placed either in front or behind; the main thing to consider is whether it meets the installation requirements of the flow meter
This post was last edited by CHANGBAISHI on 2017-4-12 at 11:33. The impact of the valves on either side of the flow meter is ignored; appropriate consideration should be given to maintenance aspects. Generally, the installation distance for orifice plate flow meters is determined based on a multiple of the nominal diameter of the straight pipe; the specific requirements in this regard can be found in the instructions provided by the manufacturer. It is also necessary to have compensation devices for pressure and temperature. Ultimately, the installation must be carried out in accordance with the requirements provided by the flow meter manufacturer, taking the compensation factors into account as well.
Does the teacher mean that installing it before and after the valve results in no error or only a very small error in the experiment?
The installation requirements for flowmeters generally involve straight pipe sections, with no obstacles allowed in these sections of the pipeline. It is recommended to consult the flow meter installation instructions. There are various types of flow meters available these days; just choose one that meets the requirements. Speaking of valves, they constitute an obstacle in straight pipe sections; therefore, such valves should not be present in straight pipe sections. Emphasize that check the instructions.