Long-pattern stub end

A long-pattern stub end forms the process-contacting part of a lap-joint flange assembly. Its pipe end is butt welded to the line, while its lap provides the seating face and a loose backing flange bears behind it. Long pattern identifies the body-length pattern and must not be automatically equated with stub-end Type A, B, or C. The greater pattern length can change clearance between the backing flange and weld. Selection should coordinate pattern length, lap and back-face profile, mating flange, gasket, material, end wall, and inspection needs.