Weld Neck Flange DN 250 PN 40 — EN 1092-1 / IS 6392
Weld Neck Flange DN 250 PN 40 to EN 1092-1 / IS 6392: outside diameter 450 mm, bolt circle (pcd) 385 mm, number of bolt holes 12, bolt hole diameter 33 mm, pipe od (iso series) 273.1 mm.
Dimensions of Weld Neck Flange DN 250 PN 40
| Symbol | Dimension | Value |
|---|---|---|
| D | Outside diameter | 450 mm (17.717 in) |
| K | Bolt circle (PCD) | 385 mm (15.157 in) |
| n | Number of bolt holes | 12 |
| L | Bolt hole diameter | 33 mm (1.299 in) |
| M | Bolt size | M30 |
| A | Pipe OD (ISO series) | 273.1 mm (10.752 in) |
SKU TSH-FLANGE-WN-EN1092-40-250 · Standard EN 1092-1 / IS 6392
Purchase description
FLANGE, WELD NECK (TYPE 11), DN 250, PN 40, ASTM A105N, EN 1092-1 / IS 6392
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
- Flange thickness (C) and hub dimensions depend on the EN 1092-1 flange type and PN. Ask Teshi for the type-specific drawing.
- IS 6392 flanges of the same PN share this OD, PCD and drilling.
Same size, other ratings
Other sizes — Weld Neck, PN 40
DN 15DN 20DN 25DN 32DN 40DN 50DN 65DN 80DN 100DN 125DN 150DN 200DN 300
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.