Dimensions Weld Neck & Blind flanges ASME B16.47 Series B Class 900


Weld Neck flange

OTHER PRESSURE CLASSES

150
300
400
600
900
NPS OD D B
(WNF)
B
(BLF)
H A
26 660.4 1020 141.35 160.35 265.35 743
28 711.2 1105 154.05 173.05 282.35 797
30 762 1180 161.95 182.45 295.35 851
32 812.8 1240 166.75 192.35 309.35 908
34 863.6 1315 177.85 201.35 325.35 962
36 914.4 1345 179.45 208.05 331.35 1016
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


Blind flange

NPS G K L No of
Bolts
Stud Bolt
Dia x L
26 762 901.7 66.7 20 2.1/2 425
28 819 971.6 73 20 2.3/4 470
30 876 1035 79.4 20 3 495
32 927 1092.2 79.4 20 3 508
34 991 1155.7 85.7 20 3.1/4 540
36 1029 1200.2 79.4 24 3 533
38 1099 1289 92.1 20 3.1/2 591
40 1162 1339.8 92.1 24 3.1/2 603
42 1213 1390.6 92.1 24 3.1/2 622
44 1270 1463.7 98.4 24 3.3/4 654
46 1334 1536.7 104.8 24 4 686
48 1384 1587.5 104.8 24 4 705

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 B flanges are the same as for the Series A 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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