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Flange Guide

Dimensions Weld Neck & Slip-On flanges BS 3293 Class 150

Weld Neck flange

Other Pressure Classes

150

Foreword

NPS O B1 C Y2 Y1 A
26 869.9 666.7 50.8 127.0 85.7 660.4
28 927.1 717.6 52.4 128.6 87.3 711.2
30 984.2 768.3 54.0 130.2 88.9 762.0
32 1060.4 819.1 57.1 133.3 92.1 812.8
34 1111.2 869.9 58.7 134.9 93.7 863.6
36 1168.4 920.7 60.3 136.5 95.2 914.4
38 1238.2 971.5 60.3 136.5 95.2 965.2
40 1289.0 1022.3 63.5 139.7 98.4 1016.0
42 1346.2 1073.2 66.7 142.9 101.6 1066.8
44 1403.3 1123.9 66.7 142.9 101.6 1117.6
46 1454.2 1174.7 68.3 144.5 103.2 1168.4
48 1511.1 1225.5 69.9 146.1 104.8 1219.2
Slip-On flange
NPS X R NBH DBH D r
26 723.9 742.9 24 34.9 806.4 6.35
28 781.0 793.7 28 34.9 863.6 6.35
30 831.8 857.2 28 34.9 914.4 6.35
32 889.0 908.0 28 41.3 977.9 7.94
34 939.8 958.8 32 41.3 1028.7 7.94
36 996.9 1022.3 32 41.3 1085.8 7.94
38 1060.4 1073.1 32 41.3 1149.3 9.53
40 1111.2 1123.9 36 41.3 1200.1 9.53
42 1168.4 1193.8 36 41.3 1257.3 9.53
44 1219.2 1244.6 40 41.3 1314.4 11.11
46 1270.0 1295.4 40 41.3 1365.2 11.11
48 1327.2 1358.9 44 41.3 1422.4 11.11

Weights of Class 150 Weld Neck & Slip-On flanges

NPS Weld Neck
kg
Slip-On
kg
26 118 107
28 134 122
30 153 138
32 190 170
34 212 184
36 242 211
38 284 249
40 311 272
42 358 313
44 376 331
46 399 349
48 440 381

Indications:

General note:

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BS 3293

Foreword: BS 3293:1960 is a dimensional British Standard only and applies to forged carbon steel slip-on and welding neck flanges of nominal sizes 26 in and larger, for use in the petroleum industry. Drilling, bolting, facing and thickness dimensions are applicable also to integral end flanges of valve and fittings. Four classes of flanges are provided for, namely Classes 150, 300, 400 and 600. BS 3293:1960 does not include pressure/temperature ratings; the flange designations quoted are for identification purposes only.