ASME B16.47 Series A/MSS SP-44 Class 300 WN

The Welding neck flanges is normally referred to as the high hub flange. It is designed to transfer stresses to the pipe, thereby reducing high stress concentrations at the base of the flange.

The welding neck flange is the best designed butt-welded flange of those currently available because of its inherent structural value. It is expensive because of the design.

Norminal Pipe Size	O.D.of Flange, O	Min.Thick-ness of WN Flange, tf	Lenth Through Hub, Y	Diam. of Hub, X	Hub Diam. Top, A	Raised Fase Diam., R	Bore (XS)	Diam of Bolt Circle	No.of Bolt Holes	Diam.of Bolt Hole	Min.Fillet Radius, r1	Approxi-mate Weight kgs
26	970	77.8	183	721	660.4	749	635.0	876.3	28	44.5	10	281.42
28	1035	84.2	195	775	711.2	800	685.8	939.8	28	44.5	11	341.50
30	1090	90.5	208	827	762.0	857	736.6	997.0	28	47.6	11	391.62
32	1150	96.9	221	881	812.8	914	787.4	1054.1	28	50.8	11	453.92
34	1205	100.1	230	937	863.6	965	838.2	1104.9	28	50.8	13	507.59
36	1270	103.2	240	991	914.4	1022	889.0	1168.4	32	54.0	13	566.57
38	1170	106.4	179	994	965.2	1029	939.8	1092.2	32	41.3	13	319.44
40	1240	112.8	192	1048	1016.0	1086	990.6	1155.7	32	44.5	13	386.54
42	1290	117.5	198	1099	1066.8	1137	1041.4	1206.5	32	44.5	13	420.71
44	1355	122.3	205	1149	1117.6	1194	1092.2	1263.6	32	47.6	13	480.07
46	1415	127.0	214	1203	1168.4	1245	1143.0	1320.8	28	50.8	13	544.96
48	1465	131.8	222	1254	1219.2	1302	1193.8	1371.6	32	50.8	13	580.44
50	1530	138.2	230	1305	1270.0	1359	1244.6	1428.8	32	54.0	13	660.93
52	1580	142.9	237	1356	1320.8	1410	1295.4	1479.6	32	54.0	13	708.91
54	1660	150.9	251	1410	1371.6	1467	1346.2	1549.4	28	60.3	13	863.02
56	1710	152.4	259	1464	1422.4	1518	1397.0	1600.2	28	60.3	13	909.29
58	1760	157.2	265	1514	1473.2	1575	1447.8	1651.0	32	60.3	13	952.75
60	1810	162.0	271	1565	1524.0	1626	1498.6	1701.8	32	60.3	13	1012.28