WELDING NECK FLANGES

This type of flange is distinguished from other types by their long tapered hub and gentle transition of thickness in the region of the butt weld joining them to the pipe. The long tapered hub provides an important reinforcement of the flange proper from the standpoint of strength and resistance to dishing.
This type of flange is preferred for every severe service condition, whether this results from high pressure or from sub-zero or elevated temperature, and whether loading conditions are substantially constant or fluctuate between wide limits.

Size:
1/2" ~ 24"

Classes are:
Class 150
Class 300
Class 600
Class 900
Class 1500
Class 2500