Plate & blind flange NB 300 Class F — AWWA C207
Plate & blind flange NB 300 Class F to AWWA C207: outside dia 520.7 mm, bore / id (plate) 327.2 mm, thickness — plate rf 41.4 mm, thickness — blind rf 41.4 mm.
Dimensions of Plate & blind flange NB 300 Class F
| Symbol | Dimension | Value |
|---|---|---|
| OD | Outside dia | 520.7 mm (20.500 in) |
| · | Bore / ID (plate) | 327.2 mm (12.882 in) |
| · | Thickness — plate RF | 41.4 mm (1.630 in) |
| · | Thickness — blind RF | 41.4 mm (1.630 in) |
| · | Teshi QC flag | STD |
SKU TSH-FLANGE-AWWA-C207-CLASS-F-300 · Standard AWWA C207 · Teshi master data
Purchase description
PLATE & BLIND FLANGE, NB 300, CLASS F, ASTM A105N, AWWA C207
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
- PLATE FF thickness identical to PLATE thickness for every size; FF column omitted.
- BLIND FF thickness identical to BLIND thickness for every size; FF column omitted.
Same size, other ratings
Other sizes — Plate & blind flange, Class F
NB 100NB 125NB 150NB 200NB 250NB 350NB 400NB 450NB 500NB 550NB 600NB 650NB 700NB 750NB 800NB 850NB 900NB 950NB 1000NB 1050NB 1100NB 1150NB 1200
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.