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 | 1085 | 160.4 | 749 | 952.5 | 20 | 73.0 | 1083.74 |
| 28 | 1170 | 171.5 | 800 | 1022.4 | 20 | 79.4 | 1342.81 |
| 30 | 1230 | 182.6 | 857 | 1085.8 | 20 | 79.4 | 1594.25 |
| 32 | 1315 | 193.7 | 914 | 1155.7 | 20 | 85.7 | 1927.07 |
| 34 | 1395 | 204.8 | 965 | 1225.6 | 20 | 92.1 | 2284.99 |
| 36 | 1460 | 214.4 | 1022 | 1289.0 | 20 | 92.1 | 2640.60 |
| 38 | 1460 | 215.9 | 1099 | 1289.0 | 20 | 92.1 | 2665.81 |
| 40 | 1510 | 223.9 | 1162 | 1339.8 | 24 | 92.1 | 2927.11 |
| 42 | 1560 | 231.8 | 1213 | 1390.6 | 24 | 92.1 | 3253.10 |
| 44 | 1650 | 242.9 | 1270 | 1463.7 | 24 | 98.4 | 3801.41 |
| 46 | 1735 | 255.6 | 1334 | 1536.7 | 24 | 104.8 | 4408.64 |
| 48 | 1785 | 263.6 | 1384 | 1587.5 | 24 | 104.8 | 4836.34 |