Series B weld neck flange 56" Class 150 (NPS 26–60) — ASME B16.47 Series B (API 605)
Series B weld neck flange 56" Class 150 (NPS 26–60) to ASME B16.47 Series B (API 605): outside diameter 1600.2 mm, raised face dia. 1492.2 mm, bolt circle 1543 mm, no. of holes 60, hole diameter 31.8 mm.
Dimensions of Series B weld neck flange 56" Class 150 (NPS 26–60)
| Symbol | Dimension | Value |
|---|---|---|
| · | Outside diameter | 1600.2 mm (63.000 in) |
| · | Raised face dia. | 1492.2 mm (58.748 in) |
| · | Bolt circle | 1543 mm (60.748 in) |
| · | No. of holes | 60 |
| · | Hole diameter | 31.8 mm (1.252 in) |
| · | Bolt size | 1-1/8 in |
SKU TSH-FLANGE-ASME-B16-47-SERIES-B-API-605-CLASS-150-NPS-26-60-56 · Standard ASME B16.47 Series B (API 605) · verified by 2+ sources
Purchase description
SERIES B WELD NECK FLANGE, 56", 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).
Notes
- PARTIAL TABLE. Inch values converted to mm at 25.4; null = not verifiable from search results.
- Bolt count and stud size for all sizes: Wermac B16.47B stud table, matched by a second listing (NPS | N | D) and Wermac Class 150 flange page (26–30, 58–60). Metric spot-check: Wermac/Marcel Forged NPS 26 RF 711, PCD 744.5, hole 22.2 mm; NPS 60 RF 1600, PCD 1662.1, hole 34.9 mm.
- OD / bolt circle / hole dia: API International (Table 38C); NPS 26, 32, 56, 58, 60 cross-checked with Ferrobend / Project Materials / Piping Pipeline. NPS 28, 34, 38 OD and PCD from API International only. NPS 40, 42, 48, 54 OD/RF/PCD from API International; NPS 40 also matched by a second table.
- Thickness: only NPS 26 (1.57 in; API International, Texas Flange, Marcel Forged 39.8 mm) and NPS 60 (2.94 in; API International, Marcel Forged 74.7 mm) recorded. Ferrobend lists larger 'max thickness' values (26: 1.62, 40: 2.19, 60: 3.00); a Project Materials table gives NPS 40 min WN 2.13 vs Ferrobend 2.19 — left null.
- Hub length: NPS 26 3.44 in (Texas Flange + API Intl; Ferrobend says 3.50). NPS 30/36/42 from Texas Flange only; NPS 40 5.00 in Texas Flange + API Intl. Hub dia NPS 26 26.94 in (Ferrobend; piping-world 684 mm), NPS 40 41.31 in single-source.
- A Project Materials chart labelled Series B (NPS 26 OD 724 mm, 24 bolts) conflicts with all other sources and was rejected.
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.