Series B weld neck flange 34" Class 150 (NPS 26–60) — ASME B16.47 Series B (API 605)
Series B weld neck flange 34" Class 150 (NPS 26–60) to ASME B16.47 Series B (API 605): outside diameter 1004.8 mm, bolt circle 957.3 mm, no. of holes 40, hole diameter 25.4 mm.
Dimensions of Series B weld neck flange 34" Class 150 (NPS 26–60)
| Symbol | Dimension | Value |
|---|---|---|
| · | Outside diameter | 1004.8 mm (39.559 in) |
| · | Bolt circle | 957.3 mm (37.689 in) |
| · | No. of holes | 40 |
| · | Hole diameter | 25.4 mm (1.000 in) |
| · | Bolt size | 7/8 in |
SKU TSH-FLANGE-ASME-B16-47-SERIES-B-API-605-CLASS-150-NPS-26-60-34 · Standard ASME B16.47 Series B (API 605)
Purchase description
SERIES B WELD NECK FLANGE, 34", CLASS 150 (NPS 26–60), ASTM A105N, ASME B16.47 SERIES B (API 605)
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).
Same size, other ratings
Other sizes — Series B weld neck flange, Class 150 (NPS 26–60)
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.