An orifice plate flowmeter is a type of flowmeter that is used to measure the flow rate of liquids, gases, and steam in a pipe. It works by creating a restriction in the flow of the fluid, which causes a pressure drop across the orifice plate. The flow rate can then be calculated using the pressure drop and the fluid's density, viscosity, and temperature.
The orifice plate is a thin piece of metal or other material that is inserted into the pipe. It has a circular opening (or "orifice") of a specific size and shape, which creates the restriction in the flow. The orifice plate is typically installed in a pipe using flanges, which hold it in place and provide a means for connecting pressure-sensing devices.
Orifice plate flowmeters are widely used in industrial applications due to their accuracy, reliability, and ease of use. They are used in a variety of industries, including oil and gas, chemical, water treatment, and power generation. Orifice plate flowmeters are able to measure wide range of flow rates, have a relatively low cost and can handle high pressure and temperatures. However, they are not suitable for measurement of slurry, multiphase and gas flow with high percentage of solids.