ASME B16.47 Series B / API 605 Class 600 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 26 890 111.2 181 698 660.4 727 635.0 806.4 28 44.5 13 259.28 28 950 115.9 190 752 711.2 784 685.8 863.6 28 47.6 13 299.55 30 1020 125.5 205 806 762.0 841 736.6 927.1 28 50.8 13 372.00 32 1085 130.2 216 860 812.8 895 787.4 984.2 28 54.0 13 432.05 34 1160 141.3 233 914 863.6 953 838.2 1054.1 24 60.3 14 542.78 36 1215 146.1 243 968 914.4 1010 889.0 1104.9 28 60.3 14 ...