BS 3293 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.

Nominal
pipe size		Outside
diameter of
flange, O		Outside
diameter,
R		Thickness of
flange min., C		Outside
diameter of
large end of hub, X		Outside diameter
of small end of
hub: Welding neck, A		Length through hub, YFillet radiusFlange bore, BDiameter of
bolt circle, D		Diameter of
bolt holes		Number of
bolt holes
26869.95742.9550.80723.90660.40127.006.35To be
specified by
the
purchaser		806.4534.9324
28927.10793.7552.39781.05711.20128.596.35863.6034.9328
30984.25857.2553.98831.85762.00130.186.35914.4034.9328
321060.45908.0557.15889.00812.80133.357.94977.9041.2828
341111.25958.8558.74939.80863.60134.947.941028.7041.2832
361168.401022.3560.33996.95914.40136.537.941085.8541.2832
381238.251073.1560.331060.45965.20136.539.531149.3541.2832
401289.051123.9563.501111.251016.00139.709.531200.1541.2836
421346.201193.8066.681168.401066.80142.889.531257.3041.2836
441403.351244.6066.681219.201117.60142.8811.111314.4541.2840
461454.151295.4068.261270.001168.40144.4611.111365.2541.2840
481511.301358.9069.851327.151219.20146.0511.111422.4041.2844

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