Dimensions Orifice Weld Neck RTJ flanges ASME B16.36 Class 900
OTHER PRESSURE CLASSES
900
| NPS | Out Side DIA |
Min thk Flg |
Hgt Flg |
Grv NO |
Pitch DIA |
Grv Depth |
| O | T | H | P | E | ||
| 1 | 125 | 36.6 | 81 | R16 | 50.80 | 6.35 |
| 1.1/2 | 155 | 36.6 | 84 | R20 | 68.27 | 6.35 |
| 2 | 165 | 36.6 | 84 | R23 | 82.55 | 7.92 |
| 2.1/2 | 190 | 36.6 | 87 | R26 | 101.60 | 7.92 |
| 3 | 240 | 38.1 | 102 | R31 | 123.83 | 7.92 |
| 4 | 290 | 44.5 | 114 | R37 | 149.23 | 7.92 |
| 6 | 380 | 55.6 | 140 | R45 | 211.12 | 7.92 |
| 8 | 470 | 63.5 | 162 | R49 | 269.88 | 7.92 |
| 10 | 545 | 69.9 | 184 | R53 | 323.85 | 7.92 |
| 12 | 610 | 79.4 | 200 | R57 | 381.00 | 7.92 |
| 14 | 640 | 85.8 | 213 | R62 | 419.10 | 11.13 |
| 16 | 705 | 88.9 | 216 | R66 | 469.90 | 11.13 |
| 18 | 785 | 101.6 | 229 | R70 | 533.40 | 12.70 |
| 20 | 855 | 108.0 | 248 | R74 | 584.20 | 12.70 |
| 24 | 1040 | 139.7 | 292 | R78 | 692.15 | 15.88 |
| NPS | Grv Width |
R Btm |
Hgt Oval Ring |
Hub DIA |
Hub DIA |
DIA of Tap |
| F | R | W | X | A | Tg | |
| 1 | 8.74 | 0.8 | 25.4 | 54 | 33.5 | 6.4 |
| 1.1/2 | 8.74 | 0.8 | 25.4 | 70 | 48.3 | 6.4 |
| 2 | 11.91 | 0.8 | 27.0 | 84 | 60.3 | 6.4 |
| 2.1/2 | 11.91 | 0.8 | 27.0 | 100 | 73.0 | 6.4 |
| 3 | 11.91 | 0.8 | 27.0 | 127 | 88.9 | 9.5 |
| 4 | 11.91 | 0.8 | 27.0 | 159 | 114.3 | 12.7 |
| 6 | 11.91 | 0.8 | 27.0 | 235 | 168.3 | 12.7 |
| 8 | 11.91 | 0.8 | 27.0 | 298 | 219.1 | 12.7 |
| 10 | 11.91 | 0.8 | 27.0 | 368 | 273.0 | 12.7 |
| 12 | 11.91 | 0.8 | 27.0 | 419 | 323.8 | 12.7 |
| 14 | 16.66 | 1.5 | 33.3 | 451 | 355.6 | 12.7 |
| 16 | 16.66 | 1.5 | 36.5 | 508 | 406.4 | 12.7 |
| 18 | 19.84 | 1.5 | 39.7 | 565 | 457.2 | 12.7 |
| 20 | 19.84 | 1.5 | 39.7 | 622 | 508.0 | 12.7 |
| 24 | 26.97 | 2.4 | 47.6 | 749 | 609.6 | 12.7 |
| NPS | Bolt Circle |
NO of Bolts |
DIA of Holes |
DIA Stud Bolts |
Stud Bolt L |
| 1 | 88.9 | 4 | 3/4 | 5/8 | 140 |
| 1.1/2 | 114.3 | 4 | 7/8 | 3/4 | 140 |
| 2 | 127.0 | 8 | 3/4 | 5/8 | 140 |
| 2.1/2 | 149.2 | 8 | 7/8 | 3/4 | 145 |
| 3 | 190.5 | 8 | 1 | 7/8 | 165 |
| 4 | 235.0 | 8 | 1.1/4 | 1.1/8 | 190 |
| 6 | 317.5 | 12 | 1.1/4 | 1.1/8 | 210 |
| 8 | 393.7 | 12 | 1.1/2 | 13/8 | 240 |
| 10 | 469.9 | 16 | 1.1/2 | 13/8 | 255 |
| 12 | 533.4 | 20 | 1.1/2 | 13/8 | 275 |
| 14 | 558.8 | 20 | 1.5/8 | 1.1/2 | 290 |
| 16 | 616.0 | 20 | 1.3/4 | 1.5/8 | 305 |
| 18 | 685.8 | 20 | 2 | 17/8 | 350 |
| 20 | 749.3 | 20 | 2.1/8 | 2 | 375 |
| 24 | 901.7 | 20 | 25/8 | 2.1/2 | 470 |
General Notes..
- Dimensions are in millimeters, except for bolts and bolt holes.
- All other dimensions are in accordance with ASME B16.5.
- Ring joint flanges larger than NPS 12 will require angular meter taps.
Notes..
- Other NPT sizes may be furnished if required.
- Bolt lengths for raised face flanges include allowance for orifice and gasket thickness
of 6 mm (0.25 in.) for NPS 3 to NPS 12 and 10 mm (0.38 in.) for NPS 14 to NPS 24.
Bolt lengths for ring-type joint flanges include allowance of 15 mm (0.62 in.) for NPS 3 to NPS 10
and 19 mm (0.75 in.) for NPS 12. - Bore (B) is to be specified by the purchaser.
- The length of the Stud Bolt does not include the height of the chamfers (points).
Tolerances
Tolerances on all dimensions shall be as shown in ASME B16.5 except for those shown below.
Pressure Tap Location
Tolerance on location of center of pressure tap hole from flange face shall be..
- ±0.5 mm (±0.02 in.) for flanges smaller than NPS 4
- ±0.8 mm (±0.03 in.) for flanges NPS 4 and larger
Bore Diameter
- Bore diameter tolerance (Welding Neck flanges only) is ±0.5% of nominal value.
Studs are measured parallel to the axis (L) from the first to the thread without the chamfers (points). S = free threads equals 1/3 time bolt dia
Hex bolts are measured from under the head to the top of de bolt
