Dimensions Weld Neck & Blind flanges ASME B16.47 Series A Class 150


Weld Neck flange

OTHER PRESSURE CLASSES

150
300
400
600
900
NPS OD D B
(WNF)
B
(BLF)
H A
26 660.4 870 68.3 68.3 120.6 676
28 711.2 925 71.5 71.5 125.6 727
30 762 985 74.7 74.7 136.6 781
32 812.8 1060 81 81 144.6 832
34 863.6 1110 82.6 82.6 149.6 883
36 914.4 1170 90.5 90.5 157.6 933
38 965.2 1240 87.4 87.4 157.6 991
40 1016 1290 90.5 90.5 163.6 1041
42 1066.8 1345 96.9 96.9 171.6 1092
44 1117.6 1405 101.7 101.7 177.6 1143
46 1168.4 1455 103.2 103.2 185.6 1197
48 1219.2 1510 108 108 192.6 1248
50 1270 1570 111.2 111.2 203.6 1302
52 1320.8 1625 115.9 115.9 209.6 1353
54 1371.6 1685 120.7 120.7 215.6 1403
56 1422.4 1745 123.9 123.9 228.6 1457
58 1473.2 1805 128.6 128.6 234.6 1508
60 1524 1855 131.8 131.8 239.6 1559


Blind flange

NPS G K L No of
Bolts
Stud Bolt
Dia x L
26 749 806.4 34.9 24 1.1/4 222
28 800 863.6 34.9 28 1.1/4 228
30 857 914.4 34.9 28 1.1/4 234
32 914 977.9 41.3 28 1.1/2 266
34 965 1028.7 41.3 32 1.1/2 266
36 1022 1085.8 41.3 32 1.1/2 279
38 1073 1149.4 41.3 32 1.1/2 279
40 1124 1200.2 41.3 36 1.1/2 279
42 1194 1257.3 41.3 36 1.1/2 292
44 1245 1314.4 41.3 40 1.1/2 304
46 1295 1365.2 41.3 40 1.1/2 304
48 1359 1422.4 41.3 44 1.1/2 317
50 1410 1479.6 47.6 44 1.3/4 336
52 1461 1536.7 47.6 44 1.3/4 349
54 1511 1593.8 47.6 44 1.3/4 355
56 1575 1651 47.6 48 1.3/4 361
58 1626 1708.2 47.6 48 1.3/4 374
60 1676 1759 47.6 52 1.3/4 381

Important Information

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

Measuring lengths of Stud Bolts

 

Hex bolts are measured from under the head to the top of de bolt


Measuring lengths of Hex bolts


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