ASME B16.47 Series B / API 605 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	865	87.4	168	702	665.2	737	639.8	803.3	32	34.9	14	192.17
28	920	87.4	148	756	716.0	787	690.6	857.2	36	34.9	14	201.54
30	990	92.1	156	813	768.4	845	743.0	920.8	36	38.1	14	244.39
32	1055	101.6	167	864	819.2	902	793.8	977.9	32	41.3	16	302.35
34	1110	101.6	171	918	870.0	953	844.6	1031.9	36	41.3	16	325.93
36	1170	101.6	179	965	920.8	1010	895.4	1089.0	32	44.5	16	360.30
38	1220	109.6	165	1016	971.6	1060	946.2	1139.0	36	44.5	16	387.36
40	1275	114.3	197	1067	1022.4	1114	997.0	1190.6	40	44.5	16	442.44
42	1335	117.5	203	1118	1074.7	1168	1049.3	1244.6	36	47.6	16	491.16
44	1385	125.5	213	1173	1125.5	1219	1100.1	1295.4	40	47.6	16	541.07
46	1460	127.0	221	1229	1176.3	1270	1150.9	1365.2	36	50.8	16	633.78
48	1510	127.0	222	1278	1227.1	1327	1201.7	1416.0	40	50.8	16	651.27
50	1560	136.6	233	1330	1277.9	1378	1252.5	1466.8	44	50.8	16	715.51
52	1615	141.3	241	1383	1328.7	1429	1303.3	1517.6	48	50.8	16	775.24
54	1675	135.0	238	1435	1379.5	1480	1354.1	1578.0	48	50.8	16	804.16
56	1765	152.4	267	1494	1430.3	1537	1404.9	1651.0	36	60.3	17	1071.01
58	1825	152.4	273	1548	1481.1	1594	1455.7	1712.9	40	60.3	17	1137.64
60	1880	149.3	270	1599	1557.3	1651	1531.9	1763.7	40	60.3	17	1071.78