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Daniel Orifice Flange Union
Economical and easy-to-use, Daniel™ Orifice Flange Unions securely hold an orifice plate in the line to ensure differential pressure measurement in accordance with AGA 3, API 14.
3 and OIML 5167. This low maintenance flow measurement device simplifies the plate inspection and removal process with one tool required for flange separation. Rigorous manufacturing procedures, including correct alignment of the flange bore and plate centering, ensure every Daniel flange union meets strict AGA tolerances for reliable, long term measurement performance. The device is available in a range of standard line sizes and configurations with optional materials available upon request to meet more severe application requirements.
Daniel Orifice Flange Union


Measurement Type
Differential pressure
Fluid Type
Liquid, gas
Discharge Coefficient Uncertainty
In accordance with AGA 3/API 14.3
Line Size
.5-in to 36-in (150 to 3650 mm)
Max. Operating Pressure
ANSI 2500
Process Temperature Range
-20°F to +160°F (-29°C to +71°C )
Flange Type
Weldneck-raised face ANSI 300 to 600 in all sizes; Weldneck-Raised Face in ANSI 900 to 2500 in 2-in to12-in; Weldneck-Ring Joint ANSI 300 to 2500 in 2-in to 12-in
Process Wetted Material
Carbon Steel (WCB and LCC), 316/316L SST, Duplex


  • Emerson’s latest generation of DanPac Systems offers smart, integrated custody transfer solutions facilitating exceptional accuracy and unsurpassed control of flow metering installations. DanPac Systems feature a comprehensive configuration utility
  • Maximize uptime by performing plate changes and maintenance without removing the fitting from the line
  • Virtually eliminate maintenance time and cost with simple fitting design that has few parts
  • Achieve concentricity in accordance with the latest AGA 3/API 14.3 standards for consistently accurate measurement
  • Ensure a secure seal between the orifice plate and body seats with superior plate sealing
  • Rely on proper tap hole location, bolt and flange facings, bore smoothness and more to meet strict tolerances
  • Improve safety with manufacturing in accordance with ASTM and ANSI flange connection specifications
  • Ensure performance in accordance with ASME with optional hydrostatic testing to 1.5 times operating pressure