Blind Flange RF 26" Class 400 Series A — ASME B16.47 Series A
Blind Flange RF 26" Class 400 Series A to ASME B16.47 Series A: outside diameter 970 mm, flange thickness, min 98.5 mm, raised face diameter 749 mm, raised face height 6.4 mm, bolt circle (pcd) 876.3 mm; approx. weight 555 kg.
Dimensions of Blind Flange RF 26" Class 400 Series A
| Symbol | Dimension | Value |
|---|---|---|
| O | Outside diameter | 970 mm (38.189 in) |
| tf | Flange thickness, min | 98.5 mm (3.878 in) |
| R | Raised face diameter | 749 mm (29.488 in) |
| f | Raised face height | 6.4 mm (0.252 in) |
| W | Bolt circle (PCD) | 876.3 mm (34.500 in) |
| n | Number of bolt holes | 28 |
| h | Bolt hole diameter | 47.63 mm (1.875 in) |
| d | Stud bolt size | 1-3/4" |
| m | Approximate weight | 555 kg (1223.56 lb) |
SKU TSH-FLANGE-BL-B1647A-400-26 · Standard ASME B16.47 Series A · weight: Calculated from nominal dimensions, carbon steel (ρ 7850 kg/m³)
Purchase description
FLANGE, BLIND, RAISED FACE, 26" (DN 650), CLASS 400, ASTM A105N, ASME B16.47 SERIES A
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).
Bolting and gasket
28 stud bolts 1-3/4" UNC × 335 mm (13.25") with 56 heavy hex nuts — ASTM A193 B7 studs + A194 2H heavy hex nuts. Gasket: Spiral wound 26" Class 400, ASME B16.20, SS316 + graphite, CS outer ring.
Same size, other ratings
Other sizes — Blind, Class 400
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.