ASME B16.47 Series A/MSS SP-44 Class 900 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	1085	139.7	286	775	660.4	749	635.0	952.5	20	73.0	11	683.01
28	1170	142.9	298	832	711.2	800	685.8	1022.4	20	79.4	13	808.16
30	1230	149.3	311	889	762.0	857	736.6	1085.8	20	79.4	13	924.60
32	1315	158.8	330	946	812.8	914	787.4	1155.7	20	85.7	13	1114.09
34	1395	165.1	349	1006	863.6	965	838.2	1225.6	20	92.1	14	1298.15
36	1460	171.5	362	1064	914.4	1022	889.0	1289.0	20	92.1	14	1472.04
38	1460	190.5	352	1073	965.2	1099	939.8	1289.0	20	92.1	19	1436.84
40	1510	196.9	364	1127	1016.0	1162	990.6	1339.8	24	92.1	21	1518.64
42	1560	206.4	371	1176	1066.0	1213	1040.6	1390.6	24	92.1	21	1654.33
44	1650	214.4	391	1235	1117.6	1270	1092.2	1463.7	24	98.4	22	1941.88
46	1735	225.5	411	1292	1168.4	1334	1143.0	1536.7	24	104.8	22	2261.24
48	1785	233.4	419	1343	1219.2	1384	1193.8	1587.5	24	104.8	24	2425.26

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