An orifice plate holder (also known as an orifice flange pair) is the pressure-containing piping element of an orifice meter assembly, such as a set of orifice flanges or orifice fitting, used to contain and position the orifice plate in the piping system.
There are several different types of orifice plate holders. The simplest is an orifice flange which consists of a flange with pressure taps drilled to measure the change in pressure across the orifice plate.
Certain assembly types such as a Daniel Senior Orifice Fitting allow for the orifice plate to be removed from the line without taking the process line out of service. This is ideal for use when there are critical processes where flow to equipment cannot be removed.
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