Dimensions Weld Neck & Blind flanges ASME B16.47 Series A Class 900
OTHER PRESSURE CLASSES
900
| NPS | OD | D | B (WNF) |
B (BLF) |
H | A |
| 26 | 660.4 | 1085 | 146.05 | 166.75 | 292.35 | 775 |
| 28 | 711.2 | 1170 | 149.25 | 177.85 | 304.35 | 832 |
| 30 | 762 | 1230 | 155.65 | 188.95 | 317.35 | 889 |
| 32 | 812.8 | 1315 | 165.15 | 200.05 | 336.35 | 946 |
| 34 | 863.6 | 1395 | 171.45 | 211.15 | 355.35 | 1006 |
| 36 | 914.4 | 1460 | 177.85 | 220.75 | 368.35 | 1064 |
| 38 | 965.2 | 1460 | 196.85 | 222.25 | 358.35 | 1073 |
| 40 | 1016 | 1510 | 203.25 | 230.25 | 370.35 | 1127 |
| 42 | 1066.8 | 1560 | 212.75 | 238.15 | 377.35 | 1176 |
| 44 | 1117.6 | 1650 | 220.75 | 249.25 | 397.35 | 1235 |
| 46 | 1168.4 | 1735 | 231.95 | 261.95 | 417.35 | 1292 |
| 48 | 1219.2 | 1785 | 239.75 | 269.95 | 425.35 | 1343 |
| NPS | G | K | L | No of Bolts |
Stud Bolt Dia x L |
|
| 26 | 749 | 952.5 | 73 | 20 | 2.3/4 | 476 |
| 28 | 800 | 1022.4 | 79.4 | 20 | 3 | 501 |
| 30 | 857 | 1085.8 | 79.4 | 20 | 3 | 520 |
| 32 | 914 | 1155.7 | 85.7 | 20 | 3.1/4 | 558 |
| 34 | 965 | 1225.6 | 92.1 | 20 | 3.1/2 | 584 |
| 36 | 1022 | 1289 | 92.1 | 20 | 3.1/2 | 603 |
| 38 | 1099 | 1289 | 92.1 | 20 | 3.1/2 | 622 |
| 40 | 1162 | 1339.8 | 92.1 | 24 | 3.1/2 | 635 |
| 42 | 1213 | 1390.6 | 92.1 | 24 | 3.1/2 | 654 |
| 44 | 1270 | 1463.7 | 98.4 | 24 | 3.3/4 | 685 |
| 46 | 1334 | 1536.7 | 104.8 | 24 | 4 | 723 |
| 48 | 1384 | 1587.5 | 104.8 | 24 | 4 | 736 |
Indications..
- OD = Diameter at Weld Bevel
- D = Overall Diameter of Flange
- B (WNF) = Minimum Thickness of Welding Neck Flange
- B (BLF) = Minimum Thickness of Blind Flange
- H = Length thru Hub
- A = Diameter at Base of Hub
- G = Outside Diameter of Raised Face
- K = Bolt Circle Diameter
- L = Diameter of Bolt Holes
General notes..
- Dimensions are in millimeters unless otherwise indicated.
- For dimensions "B" and "H" click IMPORTANT.
- Blind flanges ASME B16.47 series A flanges (≥ NPS 26) are MSS SP-44 flanges.
ASME has incorporated the MSS-SP44 specification into B16.47 Series A and the API 605 Specification into B16.47 series B.
These specification include only Welding Neck and Blind Flanges. - Dimensions for Classes 400, 600 and 900 NPS 38 and larger for Series A flanges are the same as for the Series B flanges.
- The length of the Stud Bolt does not include the height of the chamfers (points).
- The length of the Stud Bolts includes one Spiral Wound Gasket with a 4.5mm thick sealing element, which is compressed to 3mm while tightening the Raised Face flange connection.
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
