Where is the weep hole located when the orifice is metering liquids?

The weep hole is positioned at the top of the orifice plate when it is utilized for metering liquids. This placement is critical for ensuring proper functioning and accuracy of the flow measurement. When fluids flow through the orifice, the design allows for any air that might accumulate above the liquid level to escape through the weep hole. This prevents air entrapment, which could lead to inaccurate readings and affect the measurement of the liquid's flow rate.

Furthermore, positioning the weep hole at the top helps to maintain the correct hydraulic balance and ensures that the pressure differential across the orifice can be accurately measured. This is particularly important in applications where precise flow measurement is necessary, such as in process control and monitoring within industrial settings.