Orifice Flange is intended for use instead of standard pipe flanges when an orifice plate or flow nozzle must be installed. Pairs of pressure “Tappings”, mostly on 2 sides, directly opposite each other, are machined into the orifice flange. This makes separate orifice carriers or tappings in the pipe wall unnecessary.
On the image above a set Orifice Flange is shown, where the tappings are sealed with a plug, and where a jack screw is machined. This jack screw is used to facilitate separating the flanges for inspection or replacement of the “Orifice Plate” and gaskets.
The range of orifice flange covers all standard sizes and ranges, and all common flange materials.Flanges are available in Welding Neck, Slip On, and Threaded form, and are typically supplied with two ½” NPT tappings in each flange. Notes: 1. The American National Pipe Thread Tapered NPT is the best known and most widely used connection where the pipe thread provides both the mechanical joint and the hydraulic seal. NPT has a tapered male and female thread which seals with Teflon tape or jointing compound. 2. ASME B1.20.1 covers dimensions and gaging of NPT pipe threads for general purpose applications.
ASME B16.36 covers Dimensions and dimensional tolerances from orifice flanges (similar to those covered in ASME B16.5) that have orifice pressure differential connections. Coverage is limited to the following flanges:
Welding Neck Classes 300, 400, 600, 900, 1500, 2500
Threaded Class 300
Slip On Class 300
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