ASME B16.47 Series B/API 605 Class 150 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	785	39.8	87	684	661.9	711	636.5	744.5	36	22.2	10	62.61
28	835	43.0	94	735	712.7	762	687.3	795.3	40	22.2	10	71.98
30	885	43.0	98	787	763.5	813	738.1	846.1	44	22.2	10	78.00
32	940	44.6	106	840	814.3	864	788.9	900.1	48	22.2	10	90.31
34	1005	47.7	109	892	865.1	921	839.7	957.3	40	25.4	10	109.16
36	1055	50.9	116	945	915.9	972	890.5	1009.6	44	25.4	10	122.69
38	1125	52.5	122	997	968.2	1022	942.8	1070.0	40	28.6	10	146.24
40	1175	54.1	127	1049	1019.0	1080	993.6	1120.8	44	28.6	10	158.37
42	1225	57.3	132	1102	1069.8	1130	1044.4	1171.6	48	28.6	11	174.09
44	1275	58.9	135	1153	1120.6	1181	1095.2	1222.4	52	28.6	11	185.45
46	1340	60.4	143	1205	1171.4	1235	1146.0	1248.3	40	31.8	11	217.52
48	1390	63.6	148	1257	1222.2	1289	1196.8	1335.1	44	31.8	11	235.84
50	1445	66.8	152	1308	1273.0	1340	1247.6	1385.9	4	31.8	11	277.60
52	1495	68.4	156	1360	1323.8	1391	1298.4	1436.7	52	31.8	11	274.80
54	1550	70.0	160	1413	1374.6	1441	1349.2	1492.2	56	31.8	11	298.15
56	1600	71.6	165	1465	1425.4	1492	1400.0	1543.0	60	31.8	14	315.74
58	1675	73.1	173	1516	1476.2	1543	1450.8	1611.3	48	34.9	14	375.36
60	1725	74.7	178	1570	1527.0	1600	1501.6	1662.1	52	34.9	14	397.93