ASME B16.36 Technical Specifications
Class 1500 Weld Neck Orifice Flanges — ASME B16.36 Dimensions & Weights
Complete technical specifications and standard dimensions for Class 1500 Weld Neck Orifice Flanges manufactured in accordance with ASME B16.36. Engineered for high-pressure applications with standard 0.25" raised face or Ring-Type Joint (RTJ).
ASME B16.36 Class 1500 Weld Neck Orifice Flange Technical Drawing (ASME B16.36 Standard Assembly)
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Class 1500WN 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|
| 1" | 5.88" | 1.50" | 2.00" | 2.06" | 1.32" | 3.25" | 1/4" NPT | 4.00" | 1.00" | 4 | 7/8" |
| 1-1/2" | 7.00" | 1.50" | 2.88" | 2.75" | 1.90" | 3.50" | 1/4" NPT | 4.88" | 1.12" | 4 | 1" |
| 2" | 8.50" | 1.50" | 3.62" | 4.12" | 2.38" | 4.00" | 1/4" NPT | 6.50" | 1.00" | 8 | 7/8" |
| 2-1/2" | 9.62" | 1.62" | 4.12" | 4.88" | 2.88" | 4.12" | 1/4" NPT | 7.50" | 1.12" | 8 | 1" |
| 3" | 10.50" | 1.88" | 5.00" | 5.25" | 3.50" | 4.62" | 3/8" NPT | 8.00" | 1.25" | 8 | 1-1/8" |
| 4" | 12.25" | 2.12" | 6.19" | 6.38" | 4.50" | 4.88" | 1/2" NPT | 9.50" | 1.38" | 8 | 1-1/4" |
| 6" | 15.50" | 3.25" | 8.50" | 9.00" | 6.63" | 6.75" | 1/2" NPT | 12.50" | 1.50" | 12 | 1-3/8" |
| 8" | 19.00" | 3.62" | 10.62" | 11.50" | 8.63" | 8.38" | 1/2" NPT | 15.50" | 1.75" | 12 | 1-5/8" |
| 10" | 23.00" | 4.25" | 12.75" | 14.50" | 10.75" | 10.00" | 1/2" NPT | 19.00" | 2.00" | 12 | 1-7/8" |
| 12" | 26.50" | 4.88" | 15.00" | 16.50" | 12.75" | 11.12" | 1/2" NPT | 22.50" | 2.12" | 16 | 2" |
| 14" | 29.50" | 5.25" | 16.25" | 18.75" | 14.00" | 11.75" | 1/2" NPT | 25.00" | 2.38" | 16 | 2-1/4" |
| 16" | 32.50" | 5.75" | 18.50" | 21.00" | 16.00" | 12.25" | 1/2" NPT | 27.75" | 2.62" | 16 | 2-1/2" |
| 18" | 36.00" | 6.38" | 21.00" | 23.25" | 18.00" | 12.88" | 1/2" NPT | 30.50" | 2.88" | 16 | 2-3/4" |
| 20" | 38.75" | 7.00" | 23.00" | 25.50" | 20.00" | 14.00" | 1/2" NPT | 32.75" | 3.12" | 16 | 3" |
| 22" | 41.25" | 7.62" | 25.25" | 27.75" | 22.00" | 15.00" | 1/2" NPT | 35.00" | 3.38" | 16 | 3-1/4" |
| 24" | 46.00" | 8.00" | 27.25" | 30.00" | 24.00" | 16.00" | 1/2" NPT | 39.00" | 3.62" | 16 | 3-1/2" |
📋 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.
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