Class B Flange Dimensions 26 — AWWA C207
Class B Flange Dimensions 26 to AWWA C207: d — flange od 34.25 in, k — bolt circle 31.75 in, n — bolts 24, l — hole dia 1.375 in, bolt — size 1.25.
Dimensions of Class B Flange Dimensions 26
| Symbol | Dimension | Value |
|---|---|---|
| · | D — Flange OD | 34.25 in |
| · | K — Bolt circle | 31.75 in |
| · | n — Bolts | 24 |
| · | L — Hole dia | 1.375 in |
| · | Bolt — Size | 1.25 |
| · | C — Slip-on ring | 0.812 in |
SKU TSH-FLANGE-AWWA-C207-26 · Standard AWWA C207 · teshi-web
Purchase description
CLASS B FLANGE DIMENSIONS, 26, 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
- All dimensions are in inches (1 in = 25.4 mm).
- AWWA C207 drilling matches ASME B16.1 / B16.5 Class 125/150 drilling in the sizes they share, so AWWA flanges bolt to Class 150 valves and fittings.
- Pressure ratings are for water service at ambient temperature; refer to the standard for test pressures.
- Values are nominal, compiled from published copies of the standard; blank cells (—) are values not confirmed from the sources available. Verify against the current edition before design, purchase or fabrication.
Other sizes — Class B Flange Dimensions, Standard
45681012141618202224283032343638404244464850525460667278849096102108114120126132138144
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.