Daniel Orifice Flange Unions

DANIEL® ORIFICE FLANGE UNIONS

The Daniel Orifice Flange Union provides a reliable and durable solution for differential pressure flow measurement installations. Designed for long-term performance in demanding pipeline environments, these assemblies are built to deliver accurate and consistent measurement results.

Available in line sizes from 2 inches to 8 inches and pressure classes ranging from ANSI 600 to ANSI 2500, the assemblies can be supplied in either carbon steel or stainless steel to meet a wide range of application requirements.

Each unit is precision-manufactured to meet or exceed the requirements of AGA Report No. 3 and API 14.3, ensuring dependable performance and compliance with industry-recognized standards for orifice-based flow measurement.

Specifications:

• Mechanical Ratings:
  • Standard: 2-in to 8-in, ANSI 600-2500, Consult factory for other options
• Mechanical Ratings: Standard: Raised face weld neck and ring-joint weld neck
• Assembly: Carbon Steel: furnished complete with studs (ASTM A-193 GR B7), nuts (ASTM A-194 GR 2H), (2) 0.0625-in non-asbestos gaskets and (2) jackscrews Stainless Steel: furnished complete with zinc-plated studs (ASTM A-193 GR B7), nuts (ASTM A-194 GR 2H), (2) 0.0625-in non-asbestos gaskets, and (2) jackscrews
• Differential Pressure Taps:
  • Location and number of tap holes
  • • Standard: 2 tap holes with orientation on top and bottom 180 deg apart, in accordance with API 14.3 (AGA3) or ISO 5167
  • • Consult the factory for other tap locations and the number of tap options
  • Process connection
  • • Standard: .50-in NPT standard
  • • Consult the factory for other options
  • Types of tap connections
  • • Standard: Threaded
  • • Optional: Socket weld
  • • Consult factory for other options
  • Line bore tolerances
  • • Standard size: Sch 40 and 80
  • • Consult factory for other options
• Temperature Range:Standard: -20°F to +250°F (-29°C to +121°C)
  Standard (low temperature): -100°F to +250°F (-73°C to +121°C)
  Consult the factory for other options
• Material Specifications:
  • Standard: A105 Carbon Steel and A350 LF-2 (low temperature applications)
  • Consult the factory for other options
• Flow Measurement Code: API 14.3
  ISO-5167
• Design Code: ASME B16.36
• Gaskets:
  • Standard gaskets for RF flanges are 0.625-in thick. (0.125-in thick gaskets are available as an option.)
  • Grafoil gasket
  • Spiral wound gasket without an inner ring
  • Garlock gylon
  • Spiral wound gasket with inner ring
  • RTJ Flanges use Daniel model 560 or 590 style plate holders. The plate holder is designed with an equivalent ring gasket to match the R-number based on size and pressure class.

Applications:

• Bore Tolerances are well within the latest recommendations of API-14.3.
• Pressure Tap Hole Location is closely controlled. Tap hole centers are 0.938-in from bearing faces of raised face flanges, placing their centerline 1-in from the face of the orifice plate when a 0.063-in gasket thickness is included.

• 1. For 3-in and smaller flanges, tap location tolerance is ± 0.016-in.
• 2. For 4-in and larger flanges, tap location tolerance is ± 0.031-in.

• Pressure Tap Holes – Tap hole edges on the flange bore surface are carefully inspected to be free from burrs. All roughness is eliminated. Sizes are shown in the following tables.
• Flange Tap Connections – Standard connections are .50-in NPT. Other sizes and types are available on request.
• Gaskets – Two 0.063-in thick(1) precision die-cut gaskets are furnished with all raised face orifice flanges. Non-asbestos gaskets are standard.