ASME B16.36 Technical Specifications
Class 900 Weld Neck Orifice Flanges — ASME B16.36 Dimensions & Weights
Complete technical specifications and standard dimensions for Class 900 Weld Neck Orifice Flanges (NPS 3" to 24") in accordance with ASME/ANSI B16.36. Heavy-duty construction complete with jack-screws, hex nuts, and radial taps.
ASME B16.36 Class 900 Weld Neck Orifice Flange Technical Drawing (ASME B16.36 Standard Assembly)
Explore ASME B16.36 Orifice Flange Classes & Types
Class 900 WN Orifice Flanges — Dimensions Chart (Inches)
| NPS | Flange OD (O) | Thickness (C) | RF Diam (R) | Hub Base (X) | Hub Bevel (A) | LTH (Y) | Tap Conn (TT) | Bolt Circle | Hole Dia | # Bolts | Bolt Dia |
|---|---|---|---|---|---|---|---|---|---|---|---|
| 3" | 9.50" | 1.50" | 5.00" | 5.00" | 3.50" | 4.00" | 3/8" NPT | 7.50" | 1.00" | 8 | 7/8" |
| 4" | 11.50" | 1.75" | 6.19" | 6.38" | 4.50" | 4.50" | 1/2" NPT | 9.25" | 1.25" | 8 | 1-1/8" |
| 6" | 15.00" | 2.19" | 8.50" | 9.00" | 6.63" | 5.50" | 1/2" NPT | 12.50" | 1.25" | 12 | 1-1/8" |
| 8" | 18.50" | 2.50" | 10.62" | 11.50" | 8.63" | 6.38" | 1/2" NPT | 15.50" | 1.50" | 12 | 1-3/8" |
| 10" | 21.50" | 2.75" | 12.75" | 14.50" | 10.75" | 7.25" | 1/2" NPT | 18.50" | 1.50" | 16 | 1-3/8" |
| 12" | 24.00" | 3.12" | 15.00" | 16.50" | 12.75" | 7.88" | 1/2" NPT | 21.00" | 1.50" | 20 | 1-3/8" |
| 14" | 25.25" | 3.38" | 16.25" | 17.75" | 14.00" | 8.38" | 1/2" NPT | 22.00" | 1.62" | 20 | 1-1/2" |
| 16" | 27.75" | 3.50" | 18.50" | 20.00" | 16.00" | 8.50" | 1/2" NPT | 24.25" | 1.75" | 20 | 1-5/8" |
| 18" | 31.00" | 4.00" | 21.00" | 22.25" | 18.00" | 9.00" | 1/2" NPT | 27.00" | 2.00" | 20 | 1-7/8" |
| 20" | 33.75" | 4.25" | 23.00" | 24.50" | 20.00" | 9.75" | 1/2" NPT | 29.50" | 2.12" | 20 | 2" |
| 22" | 36.25" | 4.62" | 25.25" | 26.75" | 22.00" | 10.25" | 1/2" NPT | 31.75" | 2.25" | 20 | 2-1/4" |
| 24" | 41.00" | 5.50" | 27.25" | 29.50" | 24.00" | 11.50" | 1/2" NPT | 35.50" | 2.62" | 20 | 2-1/2" |
📋 ASME B16.36 Orifice Flange Standard Notes
- Pressure Connections: Each orifice flange is supplied with two radial tapped pressure tap connections (standard 1/2" NPT, or 1/4" NPT / 3/8" NPT where specified) located 180 degrees apart.
- Jack-Screws: Supplied as an Orifice Union pair complete with precision jack-screws and hex nuts for spreading flanges during orifice plate installation or maintenance.
- Raised Face: Standard Class 300 and Class 400 feature a 1/16" (1.6 mm) raised face; Class 600, 900, 1500, and 2500 feature a standard 0.25" (6.4 mm) raised face or Ring Type Joint (RTJ).
- Bore Schedule: Bore diameter (B) for weld neck and slip on flanges must be specified by the purchaser to correspond with the piping schedule or wall thickness.
- Class 300 / 600 Equivalency: In accordance with ASME B16.36, Weld Neck Orifice Flanges in NPS 3" and smaller for Class 300 are identical in dimensions to Class 600 and may be dual-marked.
The Parts You Need, When You Need Them
Since 2006, Remi Tubes Industries has delivered precision Flange solutions with speed, affordability, and expertise. Need custom ASME B16.36 Orifice Flange assemblies? Let's discuss your project today!