What kind of flow meter requires straight pipe runs for accurate readings?

Venturi flow meters operate based on the principle of fluid dynamics, where the flow rate is determined by measuring the pressure difference before and after a constriction in the pipeline. For these meters to provide accurate readings, it is essential to have straight pipe runs on either side of the meter. This is because irregular flow patterns, such as turbulence or swirls caused by bends, valves, or fittings in the piping system, can lead to inaccurate pressure readings, thereby affecting the calculated flow rate.

By maintaining straight pipe runs, the flow characteristics entering and exiting the Venturi meter remain consistent, ensuring the meter can accurately measure the differential pressure. This design requirement helps to streamline the flow and reduce disturbances that could otherwise alter the meter's performance. While other types of flow meters also benefit from straight runs, Venturi meters specifically necessitate this design to ensure reliable operation and measurement fidelity.