Pipe flange

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.   Rated Diameter Flange Screws Weight of a flange (7,85 Kg/dm3) D b k Number Thread d2 Shape B Kg 15 95 14 65 4 M 12 14 0,72 20 105 16 75 1,01 25 115 16 85 1,23 32 140 16 100 M 16 18 1,8 40 150 16 110 2,09 50 165 18 125 2,88 65 185 18 145 3,66 80 200 20 160 4,77 100 220 20 180 8 5,65 125 250 22 210 8,42 150 285 22 240 M 20 22 10,4 200 340 24 295 16,5 250 395 26 350 12 24 300 445 26 400 30,9 350 505 26 460 16 40,6 400 565 26 515 M 24 26 49,4 500 670 28 620 20 75