Orifice Flanges

Orifice flanges, which come in pairs, are a single component of an Orifice flange union assembly. The Orifice flange union is composed of two Orifice flanges, an Orifice plate, bolts, nuts, jack screws and two gaskets.

Used for measuring the volumetric flow rate of liquids and gases through a pipeline, Orifice flanges come with a pipe tap for measuring the pressure drop of flow through the orifice plate. Orifice plates do not come with the flange pair, and are procured based on the specific requirements of the facility. Jack screws are used to separate the flanges when changing the orifice plate. Orifice flanges are installed in a straight run of pipe in order to avoid turbulence at the plate.

Orifice flanges are essentially Weld Neck, Slip-On or Threaded flanges that are machined to add radial, tapped holes in the flange ring for meter connections and jack screws. When choosing the type of Orifice flange that best suits your requirements, the merits and drawbacks of standard Weld Neck, Slip-On and Threaded flanges may apply.

Available with either raised faces or RTJ (Ring Type Joint) facings, Orifice flanges are finished with alignment dowel pins, which assure proper alignment of the flange bore within required tolerances. They are available in carbon steel, stainless and alloy grades, in classes 300# through 2500#. Because the thickness of 150# flanges is not sufficient for drilling the pressure taps, Orifice flanges are not available in 150#.

At James Duva, Inc. we are committed to providing our valued clients with the best quality products and customer service in the industry. We understand your jobs are top priority, so you can confidently work with us, knowing you’re getting a partner you can rely on.