What is a WN flange?
A weld neck flange, also called a tapered hub flange or high-hub flange, is a kind of flange that can relocate stress to the pipes, ensuring a decrease in high-stress concentration at the bottom of the flange. There are two welding neck flanges designs – the first type is used with wipes while the second, longer type cannot be used with pipes but with a process plant. The weld neck flange comprises of a round fitting that extends beyond the rim of the circumference. These flanges, typically manufactured from forging, are actually welded to pipes.
Weld Neck Flange Dimensions
Below we list some sizes of weld neck flanges (Class 150) under ASME B16.5 (1/2” to 24”).
· The 1/2” NPS weldneck flange has inside diameter of 0.62” and outside diameter of 3.50”. The raised face’s thickness is 1.88” with four holes for bolts.
· The 3/4” NPS flange has inside diameter of 0.82” and the outside diameter of 3.88”. The raised face’s thickness is 2.06” with four bolt holes.
· The 1” NPS weldneck flange has inside diameter of 1.05” and outside diameter of 4.25”. The raised face’s thickness is 2.19” and the standard bolt holes are four in a number.
· 2” NPS weldneck Flange has inside diameter of 2.07” and outside diameter of 6.00”, The raised face’s thickness is of 2.50”.
· The 5” NPS Flange has 5.05” of inside diameter and the outer diameter is of 10.00”. The thickness of the raised face is 3.50”.
· The 6” NPS Flange has 6.065” of inside diameter and the outer diameter is of 11.00”. The thickness of the raised face is 3.50”.
· The 10” NPS flange has inside diameter dimension of 10.02” and the outer diameter of 16”. The thickness of the raised face is of 4.00”.
· The 20” NPS flange has inside diameter of 19.25” and the outer diameter of 27.50”. The thickness of the raised face is 5.69”.
· The 24” NPS Weld neck flange gets the interior diameter of 23.25” and the outer diameter of 32.00”.