IS 1538 Table 21 800 double flanged 1/4 (90°) bends — IS 1538
IS 1538 Table 21 800 double flanged 1/4 (90°) bends to IS 1538: e — wall thickness 26.8 mm, r — bend radius 785 mm, a — straight 115 mm, b — centre to face 900 mm, kg — mass approx. 890 mm.
Dimensions of IS 1538 Table 21 800 double flanged 1/4 (90°) bends
| Symbol | Dimension | Value |
|---|---|---|
| · | e — Wall thickness | 26.8 mm (1.055 in) |
| · | r — Bend radius | 785 mm (30.906 in) |
| · | a — Straight | 115 mm (4.528 in) |
| · | b — Centre to face | 900 mm (35.433 in) |
| · | kg — Mass approx. | 890 mm (35.039 in) |
SKU TSH-FLANGE-IS-1538-DOUBLE-FLANGED-1-4-90-BENDS-800 · Standard IS 1538 · teshi-web
Purchase description
IS 1538 TABLE 21, 800, DOUBLE FLANGED 1/4 (90°) BENDS, ASTM A105N, IS 1538
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.
- IS 1538 has a single flange series (no separate PN tables). Bolt holes are drilled off-centres unless otherwise specified.
- Raised flanges: thickness including the raised face = flange thickness + raised-face height.
- 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 — IS 1538 Table 21, double flanged 1/4 (90°) bends
8010012515020025030035040045050060070075090010001050110012001500
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.