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 inch 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 | 2.38 | 1.90 | 3.00 |
| 2 | 1-1/4 | 2.38 | 1.66 | 3.00 |
| 2 | 1 | 2.38 | 1.32 | 3.00 |
| 2-1/2 | 2 | 2.88 | 2.38 | 3.75 |
| 2-1/2 | 1-1/2 | 2.88 | 1.90 | 3.75 |
| 2-1/2 | 1-1/4 | 2.88 | 1.66 | 3.75 |
| 3 | 2-1/2 | 3.50 | 2.88 | 4.50 |
| 3 | 2 | 3.50 | 2.38 | 4.50 |
| 3 | 1-1/2 | 3.50 | 1.90 | 4.50 |
| 3-1/2 | 3 | 4.00 | 3.50 | 5.25 |
| 3-1/2 | 2-1/2 | 4.00 | 2.88 | 5.25 |
| 3-1/2 | 2 | 4.00 | 2.38 | 5.25 |
| 4 | 3-1/2 | 4.50 | 4.00 | 6.00 |
| 4 | 3 | 4.50 | 3.50 | 6.00 |
| 4 | 2-1/2 | 4.50 | 2.88 | 6.00 |
| 4 | 2 | 4.50 | 2.38 | 6.00 |
| 5 | 4 | 5.56 | 4.50 | 7.50 |
| 5 | 3-1/2 | 5.56 | 4.00 | 7.50 |
| 5 | 3 | 5.56 | 3.50 | 7.50 |
| 5 | 2-1/2 | 5.56 | 2.88 | 7.50 |
| 20 | 10 | 20.00 | 10.75 | 30.00 |
| 6 | 5 | 6.62 | 5.56 | 9.00 |
| 6 | 4 | 6.62 | 4.50 | 9.00 |
| 6 | 3-1/2 | 6.62 | 4.00 | 9.00 |
| 6 | 3 | 6.62 | 3.50 | 9.00 |
| 24 | 16 | 24.00 | 16.00 | 36.00 |
| 8 | 6 | 8.62 | 6.62 | 12.00 |
| 8 | 5 | 8.62 | 5.56 | 12.00 |
| 8 | 4 | 8.62 | 4.50 | 12.00 |
| 10 | 8 | 10.75 | 8.62 | 15.00 |
| 10 | 6 | 10.75 | 6.62 | 15.00 |
| 10 | 5 | 10.75 | 5.56 | 15.00 |
| 12 | 10 | 12.75 | 10.75 | 18.00 |
| 12 | 8 | 12.75 | 8.62 | 18.00 |
| 12 | 6 | 12.75 | 6.62 | 18.00 |
| 14 | 12 | 14.00 | 12.75 | 21.00 |
| 14 | 10 | 14.00 | 10.75 | 21.00 |
| 14 | 8 | 14.00 | 8.62 | 21.00 |
| 16 | 14 | 16.00 | 14.00 | 24.00 |
| 16 | 12 | 16.00 | 12.75 | 24.00 |
| 16 | 10 | 16.00 | 10.75 | 24.00 |
| 18 | 16 | 18.00 | 16.00 | 27.00 |
| 18 | 14 | 18.00 | 14.00 | 27.00 |
| 18 | 12 | 18.00 | 12.75 | 27.00 |
| 18 | 10 | 18.00 | 10.75 | 27.00 |
| 20 | 18 | 20.00 | 18.00 | 30.00 |
| 20 | 16 | 20.00 | 16.00 | 30.00 |
| 20 | 14 | 20.00 | 14.00 | 30.00 |
| 20 | 12 | 20.00 | 12.75 | 30.00 |
| 24 | 22 | 24.00 | 22.00 | 36.00 |
| 24 | 20 | 24.00 | 20.00 | 36.00 |
| 24 | 18 | 24.00 | 18.00 | 36.00 |
| 24 | 14 | 24.00 | 14.00 | 36.00 |
| 24 | 12 | 24.00 | 12.75 | 36.00 |
