The Orifice Flange is used to measure the flow of product through the piping system. When the Orifice Plate is installed there is a restriction of flow creating a differential pressure and this is used to measure the flow rate of liquids, steam or gases. The Orifice Plate is a thin plate with a centre bore that is determined by the desired flow rate. Orifice Flange assemblies are available in all ASTM material Grades and fall under ASME B16.36 and are supplied with either a Raised Face or Ring Type Joint facing. They are not made in 150# rated Flanges because these Flangesare not thick enough to allow for the drilling of the pressure taps, but are supplied in the 300#, 600#, 900#, 1500# and 2500# Classes.
