Plate & blind flange NB 1800 PN25 — IS 9523
Plate & blind flange NB 1800 PN25 to IS 9523: outside dia 2195 mm, pcd 2070 mm, no. of holes 44, hole dia 70 mm, rf dia 1980 mm.
Dimensions of Plate & blind flange NB 1800 PN25
| Symbol | Dimension | Value |
|---|---|---|
| OD | Outside dia | 2195 mm (86.417 in) |
| · | PCD | 2070 mm (81.496 in) |
| · | No. of holes | 44 |
| · | Hole dia | 70 mm (2.756 in) |
| · | RF dia | 1980 mm (77.953 in) |
| · | RF height | 5 mm (0.197 in) |
| · | Bore / ID (plate) | 1823 mm (71.772 in) |
| · | Thickness — plate RF | 88 mm (3.465 in) |
| · | Thickness — plate FF | 83 mm (3.268 in) |
| · | Thickness — blind RF | 88 mm (3.465 in) |
| · | Thickness — blind FF | 83 mm (3.268 in) |
| · | Teshi QC flag | STD~ID |
SKU TSH-FLANGE-IS-9523-PN25-1800 · Standard IS 9523 · Teshi master data
Purchase description
PLATE & BLIND FLANGE, NB 1800, 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).
Notes
- Blind rows record ID as [0.0] in source; omitted.
- Verified flag values are copied from the source: 'STD', 'STD~ID' or 'CHECK'. The source does not define them; 'STD~ID' presumably means standard dimensions with a derived/non-standard ID, and 'CHECK' rows were flagged for review.
- Size column is the NB taken from the source Key (e.g. 'NB150'); 'Size label in source' is the Size cell as typed.
Same size, other ratings
Other sizes — Plate & blind flange, PN25
NB 80NB 100NB 125NB 150NB 200NB 250NB 300NB 350NB 400NB 450NB 500NB 600NB 700NB 750NB 800NB 900NB 1000NB 1100NB 1200NB 1400NB 1600NB 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.