Differentiatewith thehelp of simple diagramsorifice meterand venturi meter used for flowmeasurement

Orifice meter and Venturi meter are two types of differential pressure flow meters used for measuring the flow rate of fluids in pipelines. The main difference between the two meters is their shape and the way they create a pressure drop.

Orifice Meter:

An orifice meter consists of a flat disc with a hole in the center, called the orifice plate, which is placed perpendicular to the fluid flow. The plate creates a constriction in the pipe, causing a pressure drop across the orifice. The pressure drop is proportional to the flow rate of the fluid and is measured using a differential pressure transmitter.

Diagram of an Orifice Meter:

Venturi Meter:

A Venturi meter consists of a converging inlet section, a throat section, and a diverging outlet section. The fluid enters the meter through the converging section, which causes the velocity of the fluid to increase, and the pressure to decrease. The fluid then passes through the throat section, which has the smallest cross-sectional area and the highest velocity. The pressure drop across the throat section is measured using a differential pressure transmitter, which is proportional to the flow rate of the fluid.

Diagram of a Venturi Meter:

In summary, the main difference between the orifice meter and the venturi meter is the shape of the flow restriction. The orifice meter uses a flat plate with a hole in the center while the venturi meter uses a converging and diverging section to create a flow restriction. Both meters work based on the principle of measuring the pressure drop across a constriction in a pipe to determine the flow rate of the fluid