Long Radius Reducing Elbows are two in one fitting i.e. an elbow and a reducer. These are very sparingly used i.e. only when there is a space constraint. Normally we use a regular elbow and a reducer at one end. ASME B16.9 Table 2 provides dimensions for size range of 2” x 1” to 24” x 22”. This page provides metric dimensions for these elbows.
Available Dimensions are : OD1 | Large Size Outside Diameter, OD2 | Small Size Outside Diameter, A | Center to End Dimension.
| NPS1 | NPS2 | OD 1 | OD 2 | A |
|---|---|---|---|---|
| 2 | 1-1/2 | 60.3 | 48.3 | 76 |
| 2 | 1-1/4 | 60.3 | 42.2 | 76 |
| 2 | 1 | 60.3 | 33.4 | 76 |
| 2-1/2 | 2 | 73.0 | 60.3 | 95 |
| 2-1/2 | 1-1/2 | 73.0 | 48.3 | 95 |
| 2-1/2 | 1-1/4 | 73.0 | 42.2 | 95 |
| 3 | 2-1/2 | 88.9 | 73.0 | 114 |
| 3 | 2 | 88.9 | 60.3 | 114 |
| 3 | 1-1/2 | 88.9 | 48.3 | 114 |
| 3-1/2 | 3 | 101.6 | 88.9 | 133 |
| 3-1/2 | 2-1/2 | 101.6 | 73.0 | 133 |
| 3-1/2 | 2 | 101.6 | 60.3 | 133 |
| 4 | 3-1/2 | 114.3 | 101.6 | 152 |
| 4 | 3 | 114.3 | 88.9 | 152 |
| 4 | 2-1/2 | 114.3 | 73.0 | 152 |
| 4 | 2 | 114.3 | 60.3 | 152 |
| 5 | 4 | 141.3 | 114.3 | 190 |
| 5 | 3-1/2 | 141.3 | 101.6 | 190 |
| 5 | 3 | 141.3 | 88.9 | 190 |
| 5 | 2-1/2 | 141.3 | 73.0 | 190 |
| 20 | 10 | 508.0 | 273.0 | 762 |
| 6 | 5 | 168.3 | 141.3 | 229 |
| 6 | 4 | 168.3 | 114.3 | 229 |
| 6 | 3-1/2 | 168.3 | 101.6 | 229 |
| 6 | 3 | 168.3 | 88.9 | 229 |
| 24 | 16 | 610.0 | 406.4 | 914 |
| 8 | 6 | 219.1 | 168.3 | 305 |
| 8 | 5 | 219.1 | 141.3 | 305 |
| 8 | 4 | 219.1 | 114.3 | 305 |
| 10 | 8 | 273.0 | 219.1 | 381 |
| 10 | 6 | 273.0 | 168.3 | 381 |
| 10 | 5 | 273.0 | 141.3 | 381 |
| 12 | 10 | 323.8 | 273.0 | 457 |
| 12 | 8 | 323.8 | 219.1 | 457 |
| 12 | 6 | 323.8 | 168.3 | 457 |
| 14 | 12 | 355.6 | 323.8 | 533 |
| 14 | 10 | 355.6 | 273.0 | 533 |
| 14 | 8 | 355.6 | 219.1 | 533 |
| 16 | 14 | 406.4 | 355.6 | 610 |
| 16 | 12 | 406.4 | 323.8 | 610 |
| 16 | 10 | 406.4 | 273.0 | 610 |
| 18 | 16 | 457.0 | 406.4 | 686 |
| 18 | 14 | 457.0 | 355.6 | 686 |
| 18 | 12 | 457.0 | 323.8 | 686 |
| 18 | 10 | 457.0 | 273.0 | 686 |
| 20 | 18 | 508.0 | 457.0 | 762 |
| 20 | 16 | 508.0 | 406.4 | 762 |
| 20 | 14 | 508.0 | 355.6 | 762 |
| 20 | 12 | 508.0 | 323.8 | 762 |
| 24 | 22 | 610.0 | 559.0 | 914 |
| 24 | 20 | 610.0 | 508.0 | 914 |
| 24 | 18 | 610.0 | 457.0 | 914 |
| 24 | 14 | 610.0 | 355.6 | 914 |
| 24 | 12 | 610.0 | 323.8 | 914 |
