What is the scientific name of the thing in the red circle, and what is its principle?
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I recently saw two pipes connected to the coupling flange; it seems that there is air circulation inside, but I’m not sure of its exact technical name. Does anyone know?
It might be a \"flow meter\" or a \"measurement instrument\", commonly used to measure the flow rate of gases or liquids passing through pipes.
Yes, it’s a bit similar to yours; there’s a display on top that shows real-time data, but I don’t know what it’s called
The one on the pipeline is an orifice plate, and the one above it is a differential pressure transmitter, which measures the differential pressure in the pipeline; together with the display instrument, they constitute a differential pressure flow meter, also known as an orifice plate flow meter.
Throttle orifice flow meter (differential pressure flow meter)
Orifice plate flow meters are commonly used for steam measurement.
Vertical sampling lines for steam pipes require the installation of a liquid collection tank; in saturated steam pipes without such a tank, the measurement data will be inaccurate.