Weld Neck Flange RF 38" Class 150 Series A — ASME B16.47 Series A
Weld Neck Flange RF 38" Class 150 Series A to ASME B16.47 Series A: outside diameter 1240 mm, flange thickness, min 87.4 mm, raised face diameter 1073 mm, raised face height 1.6 mm, bolt circle (pcd) 1149.4 mm; approx. weight 397.1 kg.
Dimensions of Weld Neck Flange RF 38" Class 150 Series A
| Symbol | Dimension | Value |
|---|---|---|
| O | Outside diameter | 1240 mm (48.819 in) |
| tf | Flange thickness, min | 87.4 mm (3.441 in) |
| R | Raised face diameter | 1073 mm (42.244 in) |
| f | Raised face height | 1.6 mm (0.063 in) |
| W | Bolt circle (PCD) | 1149.4 mm (45.252 in) |
| n | Number of bolt holes | 32 |
| h | Bolt hole diameter | 41.28 mm (1.625 in) |
| d | Stud bolt size | 1-1/2" |
| Y | Length through hub | 156 mm (6.142 in) |
| X | Hub diameter at base | 991 mm (39.016 in) |
| A | Hub diameter at weld | 965.2 mm (38.000 in) |
| m | Approximate weight | 397.1 kg (875.45 lb) |
SKU TSH-FLANGE-WN-B1647A-150-38 · Standard ASME B16.47 Series A · weight: Calculated from nominal dimensions, carbon steel (ρ 7850 kg/m³)
Purchase description
FLANGE, WELD NECK, RAISED FACE, 38" (DN 950), CLASS 150, ASTM A105N, ASME B16.47 SERIES A
Available materials: ASTM A105N, ASTM A350 LF2 Cl 1, ASTM A182 F304/304L, ASTM A182 F316/316L, ASTM A182 F11 Cl 2, ASTM A182 F22 Cl 3, ASTM A182 F51 (Duplex), ASTM A182 F53 (Super Duplex), ASTM A694 F52 / F60, IS 2062 E250 (plate).
Bolting and gasket
32 stud bolts 1-1/2" UNC × 285 mm (11.25") with 64 heavy hex nuts — ASTM A193 B7 studs + A194 2H heavy hex nuts. Gasket: Spiral wound 38" Class 150, ASME B16.20, SS316 + graphite, CS outer ring.
Notes
- Weld-end bore and weld bevel to suit the specified pipe wall (ASME B16.25).
- Source: Teshi dimension master (ASME B16.47-2011 tables).
Same size, other ratings
Other sizes — Weld Neck, Class 150
Frequently asked questions
What are the main types of pipe flanges?
Weld neck (WN), slip-on (SO), blind (BL), socket weld (SW), threaded (THD), lap joint (LJ) and plate flanges. Special types include orifice, long weld neck, reducing flanges and spectacle blinds.
When should I use a weld neck flange instead of a slip-on?
Use weld neck flanges for high pressure, high or cycling temperature, and lines with vibration or fatigue loading. The tapered hub and full-penetration butt weld spread stress smoothly. Slip-on flanges are cheaper and easier to align, but their fatigue life is roughly one third of a WN.
What does Class 150, 300 or 600 mean on a flange?
The ASME class is a pressure-rating designation, not a pressure in psi. The allowable pressure depends on the material group and temperature. A Class 150 A105 flange is rated 19.6 bar at 38 °C but 13.8 bar at 200 °C.
Is a 150# flange rated for 150 psi?
No. A Class 150 carbon-steel flange is rated about 285 psi (19.6 bar) at ambient temperature, and about 170 psi (11.7 bar) at 260 °C. The "150" is a class number.