BS 3293 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.


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
261016.00749.30107.956.35747.71671.51222.2514.29To be
specified by
the
purchaser
914.4050.8028
281073.15800.10111.136.35803.28723.90234.9515.88965.2053.9828
301130.30857.25114.306.35862.01774.70247.6517.461022.3553.9828
321193.80914.40117.486.35917.58825.50260.3517.461079.5060.3328
341244.60965.20120.656.35973.14877.89269.8819.051130.3060.3328
361314.451022.35123.836.351031.88928.69282.5819.051193.8066.6828

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