The Welding Neck Flange Is Normally Referred To As The "High Hup" Flange.
It Is Designed To Transfer Stresses To The Pipe, Thereby Reducing High Stress Concentrations At The Base Of The Flange The Welding Neck Flanges Is The Best Designed Butt-Welded Flange Of Those Currently Available Because Of Its Inherent Structural Value It Is Expensive Because Of The Design.