Welding Neck Orifice Flanges
Class 1500
| Nom. size | O | C | R | X | A | A | TT | No. of holes | Diam. of holes | Diam. of bolts |
Diam. of bolt circle | Groove # | |
| O | C | R | X | A | Y | TT | |||||||
| in. | 1″ | 5.88 | 1.5 | 2 | 2.06 | 1.32 | 3.25 | 1/04/07 | 4 | 1 | 7/8″ | 4 | R16 |
| mm. | 149.4 | 38.1 | 50.8 | 52.3 | 33.5 | 82.6 | 6.4 | 25.4 | 22.2 | 101.6 | |||
| in. | 1 1/2″ | 7 | 1.5 | 2.88 | 2.75 | 1.9 | 3.5 | 1/04/07 | 4 | 1.12 | 1″ | 4.88 | R20 |
| mm. | 177.8 | 38.1 | 73.2 | 69.9 | 48.3 | 88.9 | 6.4 | 28.4 | 25.4 | 124 | |||
| in. | 2″ | 8.5 | 1.5 | 3.62 | 4.12 | 2.38 | 4 | 1/04/07 | 8 | 1 | 7/8″ | 6.5 | R24 |
| mm. | 215.9 | 38.1 | 91.9 | 104.6 | 60.5 | 101.6 | 6.4 | 25.4 | 22.2 | 165.1 | |||
| in. | 2 1/2″ | 9.62 | 1.62 | 4.12 | 4.88 | 2.88 | 4.12 | 1/04/07 | 8 | 1.12 | 1″ | 7.5 | R27 |
| mm. | 244.3 | 41.1 | 104.6 | 124 | 73.2 | 104.6 | 6.4 | 28.4 | 25.4 | 190.5 | |||
| in. | 3″ | 10.5 | 1.88 | 5 | 5.25 | 3.5 | 4.62 | 3/08/07 | 8 | 1.25 | 1 1/8″ | 8 | R35 |
| mm. | 266.7 | 47.8 | 127 | 133.4 | 88.9 | 117.3 | 9.5 | 31.8 | 28.6 | 203.2 | |||
| in. | 4″ | 12.25 | 2.12 | 6.19 | 6.38 | 4.5 | 4.88 | 1/02/07 | 8 | 1.38 | 1 1/4″ | 9.5 | R39 |
| mm. | 311.2 | 53.8 | 157.2 | 162.1 | 114.3 | 124 | 12.7 | 35.1 | 31.8 | 241.3 | |||
| in. | 6″ | 15.5 | 3.25 | 8.5 | 9 | 6.63 | 6.75 | 1/02/07 | 12 | 1.5 | 1 3/8″ | 12.5 | R46 |
| mm. | 393.7 | 82.6 | 215.9 | 228.6 | 168.4 | 171.5 | 12.7 | 38.1 | 34.9 | 317.5 | |||
| in. | 8″ | 19 | 3.62 | 10.62 | 11.5 | 8.63 | 8.38 | 1/02/07 | 12 | 1.75 | 1 5/8″ | 15.5 | |
| mm. | 482.6 | 91.9 | 269.7 | 292.1 | 219.2 | 212.9 | 12.7 | 44.5 | 41.3 | 393.7 | |||
| in. | 10″ | 23 | 4.25 | 12.75 | 14.5 | 10.75 | 10 | 1/02/07 | 12 | 2 | 1 7/8″ | 19 | |
| mm. | 584.2 | 108 | 323.9 | 368.3 | 273.1 | 254 | 12.7 | 50.8 | 47.6 | 482.6 | |||
| in. | 12″ | 26.5 | 4.88 | 15 | 17.75 | 12.75 | 11.12 | 1/02/07 | 16 | 2.12 | 2″ | 22.5 | |
| mm. | 673.1 | 124 | 381 | 450.9 | 323.9 | 282.4 | 12.7 | 53.8 | 50.8 | 571.5 | |||
| in. | 14″ | 29.5 | 5.25 | 16.25 | 19.5 | 14 | 11.75 | 1/02/07 | 16 | 2.38 | 2 1/4″ | 25 | |
| mm. | 749.3 | 133.4 | 412.8 | 495.3 | 355.6 | 298.5 | 12.7 | 60.5 | 57.2 | 635 | |||
| in. | 16″ | 32.5 | 5.75 | 18.5 | 21.75 | 16 | 12.25 | 1/02/07 | 16 | 2.6 | 2 1/2″ | 27.8 | |
| mm. | 825.5 | 146.1 | 469.9 | 552.5 | 406.4 | 311.2 | 12.7 | 66.5 | 63.5 | 704.9 | |||
| in. | 18″ | 36 | 6.38 | 21 | 23.5 | 18 | 12.88 | 1/02/07 | 16 | 2.88 | 2 3/4″ | 30.5 | |
| mm. | 914.4 | 162.1 | 533.4 | 596.9 | 457.2 | 327.2 | 12.7 | 73.2 | 69.9 | 774.7 | |||
| in. | 20″ | 38.75 | 7 | 23 | 25.25 | 20 | 14 | 1/02/07 | 16 | 3.12 | 3″ | 32.75 | |
| mm. | 984.3 | 177.8 | 584.2 | 641.4 | 508 | 355.6 | 12.7 | 79.2 | 76.2 | 831.9 | |||
| in. | 24″ | 46 | 8 | 27.25 | 30 | 24 | 16 | 1/02/07 | 16 | 3.62 | 3 1/2″ | 39 | |
| mm. | 1168.4 | 203.2 | 692.2 | 762 | 609.6 | 406.4 | 12.7 | 91.9 | 88.9 | 990.6 |