Plate & blind flange NB 350 PN25 — IS 9523
Plate & blind flange NB 350 PN25 to IS 9523: outside dia 555 mm, pcd 490 mm, no. of holes 16, hole dia 34 mm, rf dia 448 mm.
Dimensions of Plate & blind flange NB 350 PN25
| Symbol | Dimension | Value |
|---|---|---|
| OD | Outside dia | 555 mm (21.850 in) |
| · | PCD | 490 mm (19.291 in) |
| · | No. of holes | 16 |
| · | Hole dia | 34 mm (1.339 in) |
| · | RF dia | 448 mm (17.638 in) |
| · | RF height | 4 mm (0.157 in) |
| · | Bore / ID (plate) | 358.6 mm (14.118 in) |
| · | Thickness — plate RF | 30 mm (1.181 in) |
| · | Thickness — plate FF | 26 mm (1.024 in) |
| · | Thickness — blind RF | 30 mm (1.181 in) |
| · | Thickness — blind FF | 26 mm (1.024 in) |
| · | Teshi QC flag | STD~ID |
SKU TSH-FLANGE-IS-9523-PN25-350 · Standard IS 9523 · Teshi master data
Purchase description
PLATE & BLIND FLANGE, NB 350, PN25, ASTM A105N, IS 9523
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 — Plate & blind flange, PN25
NB 80NB 100NB 125NB 150NB 200NB 250NB 300NB 400NB 450NB 500NB 600NB 700NB 750NB 800NB 900NB 1000NB 1100NB 1200NB 1400NB 1600NB 1800NB 2000
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.