Brothers, why can flow meters be measured through a bypass pipe?
Thread Content
Upon reading this, it is clear that when using an electromagnetic flowmeter to measure liquids prone to scaling, it is best to install the sensor on a bypass pipe and attach stop valves at both ends of the sensor; this allows for cleaning without interrupting production. My question is: why is it still possible to measure an accurate flow rate when a bypass pipe is added to the pipeline? By dividing the pipeline in two, doesn’t that mean half of the liquid no longer flows through the flow meter? Is it perhaps because the measured value is then doubled? I don’t quite understand this.
The main pipe and the bypass pipe have the same diameter. During normal operation, the stop valves upstream and downstream of the flow meter are closed, allowing the fluid to flow only through the main pipe. To measure the flow rate and replace the flow meter, the main pipeline shut-off valve is closed, while the shut-off valves upstream and downstream of the flow meter are opened, allowing the fluid to flow through the bypass pipe only. This operating condition is only applicable to processes that do not display flow rates in real time.
Do not use bypass when using flow. During cleaning, open the valves before and after the flow meter and activate the bypass.
It’s simply a setting method for cleaning the flow meter without shutting down production. This process is additional in the setup of self-regulating valves. For reference.