Pipe flange is a method of connecting pipes, valves, pumps and other equipment to form a piping system. It also provides easy access for cleaning, inspection or modification.
| Norminal Pipe Size | O.D.of Flange, O | Min.Thick-ness of BL Flange, tf | Raised Fase Diam., R | Diam of Bolt Circle | No.of Bolt Holes | Diam.of Bolt Hole | Approxi-mate Weight kgs |
| 26 | 865 | 87.4 | 737 | 803.3 | 32 | 34.9 | 389.14 |
| 28 | 920 | 87.4 | 787 | 857.2 | 36 | 34.9 | 440.39 |
| 30 | 990 | 92.1 | 845 | 920.8 | 36 | 38.1 | 536.06 |
| 32 | 1055 | 101.6 | 902 | 977.9 | 32 | 41.3 | 673.59 |
| 34 | 1110 | 101.6 | 953 | 1031.9 | 36 | 41.3 | 745.13 |
| 36 | 1170 | 101.6 | 1010 | 1089.0 | 32 | 44.5 | 831.08 |
| 38 | 1220 | 109.6 | 1060 | 1139.0 | 36 | 44.5 | 972.27 |
| 40 | 1275 | 114.3 | 1114 | 1190.6 | 40 | 44.5 | 1106.02 |
| 42 | 1335 | 117.5 | 1168 | 1244.6 | 36 | 47.6 | 1249.71 |
| 44 | 1385 | 125.5 | 1219 | 1295.4 | 40 | 47.6 | 1433.43 |
| 46 | 1460 | 128.6 | 1270 | 1365.2 | 36 | 50.8 | 1637.53 |
| 48 | 1510 | 133.4 | 1327 | 1416.0 | 40 | 50.8 | 1813.47 |
| 50 | 1560 | 138.2 | 1378 | 1466.8 | 44 | 50.8 | 2001.73 |
| 52 | 1615 | 142.6 | 1429 | 1517.6 | 48 | 50.8 | 2211.04 |
| 54 | 1675 | 147.7 | 1480 | 1578.0 | 48 | 50.8 | 2470.94 |
| 56 | 1765 | 155.4 | 1537 | 1651.0 | 36 | 60.3 | 2890.47 |
| 58 | 1825 | 160.4 | 1594 | 1712.9 | 40 | 60.3 | 3183.51 |
| 60 | 1880 | 165.1 | 1651 | 1763.7 | 40 | 60.3 | 3485.73 |