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.
A figure-8 blank (also called a Spectacle Blind Flange) is a pressure-retaining plate with one solid end and one open end connected with a web or tie bar.
A figure-8 blank (also called a Spectacle Blind Flange) is a pressure-retaining plate with one solid end and one open end connected with a web or tie bar.
| NPS | Inside Diameter, B | Outside Diameter, O | Centerline Dimension, A | Thick-ness, t | Web Width, W | Approximate Weight kgs | |
| 1/2 | 16 | 51 | 65 | 6.4 | 38 | 7 | 0.67 |
| 3/4 | 21 | 64 | 80 | 6.4 | 38 | 7 | 1.04 |
| 1 | 27 | 70 | 90 | 6.4 | 57 | 7 | 1.28 |
| 1 1/4 | 37 | 79 | 100 | 9.7 | 57 | 7 | 1.78 |
| 1 1/2 | 43 | 92 | 115 | 9.7 | 67 | 7 | 2.42 |
| 2 | 55 | 108 | 125 | 9.7 | 57 | 7 | 3.07 |
| 2 1/2 | 67 | 127 | 150 | 12.7 | 67 | 7 | 4.79 |
| 3 | 83 | 146 | 170 | 12.7 | 67 | 7 | 6.13 |
| 3 1/2 | 96 | 159 | 185 | 15.7 | 76 | 7 | 7.89 |
| 4 | 108 | 191 | 215 | 15.7 | 76 | 7 | 11.50 |
| 5 | 135 | 238 | 265 | 19.1 | 86 | 7 | 19.80 |
| 6 | 162 | 264 | 290 | 22.4 | 86 | 7 | 25.77 |
| 8 | 212 | 318 | 350 | 28.4 | 95 | 7 | 41.75 |
| 10 | 265 | 397 | 430 | 35.1 | 105 | 7 | 74.93 |
| 12 | 315 | 454 | 490 | 41.1 | 105 | 7 | 107.25 |
| 14 | 346 | 489 | 525 | 44.5 | 114 | 7 | 130.32 |
| 16 | 397 | 562 | 605 | 50.8 | 124 | 7 | 190.96 |
| 18 | 448 | 610 | 655 | 53.8 | 133 | 7 | 229.02 |
| 20 | 497 | 679 | 725 | 63.5 | 133 | 7 | 324.54 |
| 24 | 597 | 787 | 840 | 73.2 | 152 | 7 | 477.35 |
