ASME B16.11 Elbow ASME B16.11 is a standard developed by the American Society of Mechanical Engineers (ASME) that covers the design, material, manufacturing, testing, and inspection requirements for forged steel fittings, including elbows. Specifically, ASME B16.11 covers socket-welding and threaded forged fittings. When it comes to elbows, ASME B16.11 provides specifications for forged steel elbows that are intended for use in high-pressure and high-temperature applications. These elbows are commonly used to change the direction of the fluid flow in a piping system.
| Size | Class | Range | Dimension | Specification |
| 1/4" to 4" | 2000, 3000, 6000, 9000 | Elbow, Tee, Nipple, Coupling, Plug, Socket, Bushing, Union, Welding Outlets, Socket Weld Outlets, Threaded Outlets | ANSI B 16.11 | ASTM A 182 |
| Class 2000 | Nominal Pipe Size | 1/8 | 1/4 | 3/8 | 1/2 | 3/4 | 1 | 1 1/4 | 1 1/2 | 2 | 2 1/2 | 3 | 4 |
| B | – | 29/32 | 1 1/16 | 1 5/16 | 1 9/16 | 1 27/32 | 2 7/32 | 2 1/2 | 3 1/32 | 3 11/16 | 4 5/16 | 5 3/4 | |
| F | – | 3/4 | 3/4 | 1 | 1 1/8 | 1 1/4 | 1 5/16 | 1 3/8 | 1 11/16 | 2 1/16 | 2 1/2 | 3 1/8 | |
| Wt | – | 0.188 | 0.236 | 0.435 | 0.740 | 1.058 | 1.375 | 1.740 | 2.883 | 7.750 | 11.313 | 19.125 | |
Class 3000 |
1/8 | 1/4 | 3/8 | 1/2 | 3/4 | 1 | 1 1/4 | 1 1/2 | 2 | 2 1/2 | 3 | 4 | |
| B | 29/32 | 1 1/16 | 1 5/16 | 1 9/16 | 1 27/32 | 2 7/32 | 2 1/2 | 3 1/32 | 3 11/32 | 4 | 4 3/4 | 6 | |
| F | 3/4 | 3/4 | 1 | 1 1/8 | 1 1/4 | 1 5/16 | 1 3/8 | 1 11/16 | 1 3/4 | 2 1/16 | 2 1/2 | 3 1/8 | |
| Wt | 0.250 | 0.290 | 0.500 | 0.750 | 1.188 | 1.988 | 2.235 | 3.000 | 4.930 | 7.375 | 13.588 | 19.063 | |
Class 6000 |
1/8 | 1/4 | 3/8 | 1/2 | 3/4 | 1 | 1 1/4 | 1 1/2 | 2 | 2 1/2 | 3 | 4 | |
| B | 1 1/6 | 1 5/16 | 1 9/16 | 1 27/32 | 2 7/32 | 2 1/2 | 3 1/32 | 3 11/32 | 4 | 4 3/4 | 5 3/4 | – | |
| F | 3/4 | 1 | 1 1/8 | 1 1/4 | 1 5/16 | 1 3/8 | 1 11/16 | 1 3/4 | 2 1/16 | 2 1/2 | 3 1/8 | – | |
| Wt | 0.250 | 0.640 | 0.500 | 1.438 | 2.188 | 2.785 | 4.688 | 5.750 | 9.500 | 15.000 | 30.563 | – | |
