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 | 760 | 31.9 | 705 | 723.9 | 36 | 19.1 | 117.25 |
| 28 | 815 | 31.9 | 756 | 774.7 | 40 | 19.1 | 134.93 |
| 30 | 865 | 31.9 | 806 | 825.5 | 44 | 19.1 | 152.14 |
| 32 | 915 | 33.5 | 857 | 876.3 | 48 | 19.1 | 178.51 |
| 34 | 965 | 36.6 | 908 | 927.1 | 52 | 19.1 | 216.20 |
| 36 | 1035 | 40.9 | 965 | 992.2 | 40 | 22.2 | 276.83 |
| 38 | 1085 | 43.0 | 1016 | 1043.0 | 40 | 22.2 | 319.83 |
| 40 | 1135 | 43.0 | 1067 | 1093.8 | 44 | 22.2 | 350.06 |
| 42 | 1185 | 46.3 | 1118 | 1144.6 | 48 | 22.2 | 409.80 |
| 44 | 1250 | 47.7 | 1175 | 1203.3 | 36 | 25.4 | 470.06 |
| 46 | 1300 | 49.3 | 1226 | 1254.1 | 40 | 25.4 | 524.76 |
| 48 | 1355 | 52.5 | 1276 | 1304.9 | 44 | 25.4 | 605.63 |
| 50 | 1405 | 54.1 | 1327 | 1355.7 | 44 | 25.4 | 671.18 |
| 52 | 1455 | 55.7 | 1378 | 1409.7 | 48 | 25.4 | 740.35 |
| 54 | 1510 | 58.9 | 1429 | 1460.5 | 48 | 25.4 | 842.56 |
| 56 | 1575 | 60.4 | 1486 | 1520.8 | 40 | 28.6 | 939.53 |
| 58 | 1625 | 62.0 | 1537 | 1571.6 | 44 | 28.6 | 1025.55 |
| 60 | 1675 | 65.2 | 1588 | 1622.4 | 44 | 28.6 | 1145.32 |