20K Flange Dimensions 300 — JIS B2220
20K Flange Dimensions 300 to JIS B2220: a — pipe od 318.5 mm, d — flange od 480 mm, c — flange 36 mm, d1 — raised face 395 mm, k — bolt circle 430 mm.
Dimensions of 20K Flange Dimensions 300
| Symbol | Dimension | Value |
|---|---|---|
| · | A — Pipe OD | 318.5 mm (12.539 in) |
| · | D — Flange OD | 480 mm (18.898 in) |
| · | C — Flange | 36 mm (1.417 in) |
| · | d1 — Raised face | 395 mm (15.551 in) |
| · | K — Bolt circle | 430 mm (16.929 in) |
| · | n — Bolts | 16 |
| · | L — Hole dia | 27 mm (1.063 in) |
| · | Bolt — Size | M24 |
SKU TSH-FLANGE-JIS-B2220-300 · Standard JIS B2220 · teshi-web
Purchase description
20K FLANGE DIMENSIONS, 300, ASTM A105N, JIS B2220
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 millimetres. Nominal size is the JIS 'A' size (e.g. 100A = DN 100).
- Thickness values in parentheses apply to blind flanges.
- Values are nominal dimensions from the standard; a dash (—) means the value is not listed. Verify against the current edition before design, purchase or fabrication.
Other sizes — 20K Flange Dimensions, Standard
101520253240506580(90)100125150200250350400450500(550)600650700750800850900
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.