
| Pipe Size (inch) | Nominal Outside diameter (Nominal Size) | Mean Outside diameter Min – Max | Outside diameter at Any Point Min – Max | Class-1 0.25 MPa (2.5 Kg/cm²) | Class-2 0.40 MPa (4.0 Kg/cm²) | Class-3 0.60 MPa (6 Kg/cm²) | Class-4 0.80 MPa (8.0 Kg/cm²) | Class-5 1.00 MPa (10 Kg/cm²) | Class-6 1.25 MPa (12.5 Kg/cm²) |
|---|---|---|---|---|---|---|---|---|---|
| Min – Max | Min – Max | Min – Max | Min – Max | Min – Max | Min – Max | ||||
| 0.5″ | 20 | 20.0 – 20.3 | 19.5 – 20.5 | – | – | – | – | 1.1 – 1.5 | 1.4 – 1.8 |
| 0.75″ | 25 | 25.0 – 25.3 | 24.5 – 25.5 | – | – | – | 1.2 – 1.6 | 1.4 – 1.8 | 1.7 – 2.1 |
| 1.0″ | 32 | 32.0 – 32.3 | 31.5 – 32.5 | – | – | – | 1.5 – 1.9 | 1.8 – 2.2 | 2.2 – 2.7 |
| 1.25″ | 40 | 40.0 – 40.3 | 39.5 – 40.5 | – | – | 1.4 – 1.8 | 1.8 – 2.2 | 2.2 – 2.7 | 2.8 – 3.3 |
| 1.5″ | 50 | 50.0 – 50.3 | 49.5 – 50.6 | – | – | 1.7 – 2.1 | 2.3 – 2.8 | 2.8 – 3.3 | 3.4 – 4.0 |
| 2.0″ | 63 | 63.0 – 63.3 | 62.2 – 63.8 | – | 1.5 – 1.9 | 2.2 – 2.7 | 2.8 – 3.3 | 3.5 – 4.1 | 4.3 – 5.0 |
| 2.5″ | 75 | 75.0 – 75.3 | 74.1 – 75.9 | – | 1.8 – 2.2 | 2.6 – 3.1 | 3.4 – 4.0 | 4.2 – 4.9 | 5.1 – 5.9 |
| 3.0″ | 90 | 90.0 – 90.3 | 88.9 – 91.1 | 1.3 – 1.7 | 2.1 – 2.6 | 3.1 – 3.7 | 4.0 – 4.6 | 5.0 – 5.7 | 6.1 – 7.1 |
| 4.0″ | 110 | 110.0 – 110.4 | 108.6 – 111.4 | 1.6 – 2.0 | 2.5 – 3.0 | 3.7 – 4.3 | 4.9 – 5.6 | 6.1 – 7.1 | 7.5 – 8.7 |
| 4.5″ | 125 | 125.0 – 125.4 | 123.5 – 126.5 | 1.8 – 2.2 | 2.9 – 3.4 | 4.3 – 5.0 | 5.6 – 6.4 | 6.9 – 8.0 | 8.5 – 9.8 |
| 5.0″ | 140 | 140.0 – 140.5 | 138.3 – 141.7 | 2.0 – 2.4 | 3.2 – 3.8 | 4.8 – 5.5 | 6.3 – 7.3 | 7.7 – 8.9 | 9.5 – 11.0 |
| 6.0″ | 160 | 160.0 – 160.5 | 158.0 – 162.0 | 2.3 – 2.8 | 3.7 – 4.3 | 5.4 – 6.2 | 7.2 – 8.3 | 8.8 – 10.2 | 10.9 – 12.6 |
| 7.0″ | 180 | 180.0 – 180.6 | 177.8 – 182.2 | 2.6 – 3.1 | 4.2 – 4.9 | 6.1 – 7.1 | 8.0 – 9.2 | 9.9 – 11.4 | 12.2 – 14.1 |
| 8.0″ | 200 | 200.0 – 200.6 | 197.6 – 202.4 | 2.9 – 3.4 | 4.6 – 5.3 | 6.8 – 7.9 | 8.9 – 10.3 | 11.0 – 12.7 | 13.6 – 15.7 |
| 9.0″ | 225 | 225.0 – 225.7 | 222.3 – 227.7 | 3.3 – 3.9 | 5.2 – 6.0 | 7.6 – 8.8 | 10.0 – 11.5 | 12.4 – 14.3 | 15.3 – 17.6 |
| 10.0″ | 250 | 250.0 – 250.8 | 247.0 – 253.0 | 3.6 – 4.2 | 5.7 – 6.5 | 8.5 – 9.8 | 11.2 – 12.9 | 13.8 – 15.9 | 17.0 – 19.6 |
| 11.0″ | 280 | 280.0 – 280.9 | 276.6 – 283.4 | 4.1 – 4.8 | 6.4 – 7.4 | 9.5 – 11.0 | 12.5 – 14.4 | 15.4 – 17.8 | 19.0 – 21.9 |
| 12.0″ | 315 | 315.0 – 316.0 | 311.2 – 318.8 | 4.6 – 5.3 | 7.2 – 8.3 | 10.7 – 12.4 | 14.0 – 16.1 | 17.3 – 19.9 | 21.4 – 24.7 |
| 14.0″ | 355 | 355.0 – 356.1 | 350.7 – 359.3 | 5.1 – 5.9 | 8.1 – 9.4 | 12.0 – 13.8 | 15.8 – 18.2 | 19.6 – 22.6 | 24.1 – 27.8 |
| 16.0″ | 400 | 400.0 – 401.2 | 395.2 – 404.8 | 5.8 – 6.7 | 9.1 – 10.5 | 13.5 – 15.6 | 17.8 – 20.5 | 22.0 – 25.3 | 27.2 – 31.3 |

| Pipe Size (inch) | Nominal Outside diameter (Nominal Size) | Mean Outside diameter Min – Max | Outside diameter at Any Point Min – Max | Class-1 0.25 MPa (2.5 Kg/cm²) | Class-2 0.40 MPa (4.0 Kg/cm²) | Class-3 0.60 MPa (6 Kg/cm²) | Class-4 0.80 MPa (8.0 Kg/cm²) | Class-5 1.00 MPa (10 Kg/cm²) | Class-6 1.25 MPa (12.5 Kg/cm²) |
|---|---|---|---|---|---|---|---|---|---|
| Min – Max | Min – Max | Min – Max | Min – Max | Min – Max | Min – Max | ||||
| 0.5″ | 20 | 20.0 – 20.3 | 19.5 – 20.5 | – | – | – | – | 1.1 – 1.5 | 1.4 – 1.8 |
| 0.75″ | 25 | 25.0 – 25.3 | 24.5 – 25.5 | – | – | – | 1.2 – 1.6 | 1.4 – 1.8 | 1.7 – 2.1 |
| 1.0″ | 32 | 32.0 – 32.3 | 31.5 – 32.5 | – | – | – | 1.5 – 1.9 | 1.8 – 2.2 | 2.2 – 2.7 |
| 1.25″ | 40 | 40.0 – 40.3 | 39.5 – 40.5 | – | – | 1.4 – 1.8 | 1.8 – 2.2 | 2.2 – 2.7 | 2.8 – 3.3 |
| 1.5″ | 50 | 50.0 – 50.3 | 49.5 – 50.6 | – | – | 1.7 – 2.1 | 2.3 – 2.8 | 2.8 – 3.3 | 3.4 – 4.0 |
| 2.0″ | 63 | 63.0 – 63.3 | 62.2 – 63.8 | – | 1.5 – 1.9 | 2.2 – 2.7 | 2.8 – 3.3 | 3.5 – 4.1 | 4.3 – 5.0 |
| 2.5″ | 75 | 75.0 – 75.3 | 74.1 – 75.9 | – | 1.8 – 2.2 | 2.6 – 3.1 | 3.4 – 4.0 | 4.2 – 4.9 | 5.1 – 5.9 |
| 3.0″ | 90 | 90.0 – 90.3 | 88.9 – 91.1 | 1.3 – 1.7 | 2.1 – 2.6 | 3.1 – 3.7 | 4.0 – 4.6 | 5.0 – 5.7 | 6.1 – 7.1 |
| 4.0″ | 110 | 110.0 – 110.4 | 108.6 – 111.4 | 1.6 – 2.0 | 2.5 – 3.0 | 3.7 – 4.3 | 4.9 – 5.6 | 6.1 – 7.1 | 7.5 – 8.7 |
| 4.5″ | 125 | 125.0 – 125.4 | 123.5 – 126.5 | 1.8 – 2.2 | 2.9 – 3.4 | 4.3 – 5.0 | 5.6 – 6.4 | 6.9 – 8.0 | 8.5 – 9.8 |
| 5.0″ | 140 | 140.0 – 140.5 | 138.3 – 141.7 | 2.0 – 2.4 | 3.2 – 3.8 | 4.8 – 5.5 | 6.3 – 7.3 | 7.7 – 8.9 | 9.5 – 11.0 |
| 6.0″ | 160 | 160.0 – 160.5 | 158.0 – 162.0 | 2.3 – 2.8 | 3.7 – 4.3 | 5.4 – 6.2 | 7.2 – 8.3 | 8.8 – 10.2 | 10.9 – 12.6 |
| 7.0″ | 180 | 180.0 – 180.6 | 177.8 – 182.2 | 2.6 – 3.1 | 4.2 – 4.9 | 6.1 – 7.1 | 8.0 – 9.2 | 9.9 – 11.4 | 12.2 – 14.1 |
| 8.0″ | 200 | 200.0 – 200.6 | 197.6 – 202.4 | 2.9 – 3.4 | 4.6 – 5.3 | 6.8 – 7.9 | 8.9 – 10.3 | 11.0 – 12.7 | 13.6 – 15.7 |
| 9.0″ | 225 | 225.0 – 225.7 | 222.3 – 227.7 | 3.3 – 3.9 | 5.2 – 6.0 | 7.6 – 8.8 | 10.0 – 11.5 | 12.4 – 14.3 | 15.3 – 17.6 |
| 10.0″ | 250 | 250.0 – 250.8 | 247.0 – 253.0 | 3.6 – 4.2 | 5.7 – 6.5 | 8.5 – 9.8 | 11.2 – 12.9 | 13.8 – 15.9 | 17.0 – 19.6 |
| 11.0″ | 280 | 280.0 – 280.9 | 276.6 – 283.4 | 4.1 – 4.8 | 6.4 – 7.4 | 9.5 – 11.0 | 12.5 – 14.4 | 15.4 – 17.8 | 19.0 – 21.9 |
| 12.0″ | 315 | 315.0 – 316.0 | 311.2 – 318.8 | 4.6 – 5.3 | 7.2 – 8.3 | 10.7 – 12.4 | 14.0 – 16.1 | 17.3 – 19.9 | 21.4 – 24.7 |
| 14.0″ | 355 | 355.0 – 356.1 | 350.7 – 359.3 | 5.1 – 5.9 | 8.1 – 9.4 | 12.0 – 13.8 | 15.8 – 18.2 | 19.6 – 22.6 | 24.1 – 27.8 |
| 16.0″ | 400 | 400.0 – 401.2 | 395.2 – 404.8 | 5.8 – 6.7 | 9.1 – 10.5 | 13.5 – 15.6 | 17.8 – 20.5 | 22.0 – 25.3 | 27.2 – 31.3 |