Plate & blind flange NB 350 Class 400 — ASME B16.5
Plate & blind flange NB 350 Class 400 to ASME B16.5: outside dia 585 mm, pcd 514.4 mm, no. of holes 20, hole dia 34.9 mm, rf dia 412.8 mm.
Dimensions of Plate & blind flange NB 350 Class 400
| Symbol | Dimension | Value |
|---|---|---|
| OD | Outside dia | 585 mm (23.031 in) |
| · | PCD | 514.4 mm (20.252 in) |
| · | No. of holes | 20 |
| · | Hole dia | 34.9 mm (1.374 in) |
| · | RF dia | 412.8 mm (16.252 in) |
| · | RF height | 6.4 mm (0.252 in) |
| · | Bore / ID (plate/slip-on) | 359.2 mm (14.142 in) |
| · | Thickness — plate RF | 66.8 mm (2.630 in) |
| · | Thickness — plate FF | 60.4 mm (2.378 in) |
| · | Thickness — blind RF | 66.8 mm (2.630 in) |
| · | Thickness — blind FF | 60.4 mm (2.378 in) |
| · | Teshi QC flag | STD |
SKU TSH-FLANGE-ASME-B16-5-CLASS-400-350 · Standard ASME B16.5 · Teshi master data
Purchase description
PLATE & BLIND FLANGE, NB 350, CLASS 400, ASTM A105N, ASME B16.5
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
- SORF (slip-on RF) rows are identical to PLATE rows in all dimension fields; shown once.
Other sizes — Plate & blind flange, Class 400
NB 15NB 20NB 25NB 32NB 40NB 50NB 65NB 80NB 100NB 125NB 150NB 200NB 250NB 300NB 400NB 450NB 500NB 600
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.