Flange Types

A Weld Neck flange is attached by butt welding to the adjoining pipe, shell or fitting. It is designed to transfer stresses to the pipe, thereby reducing high stress concentrations at the base of the flange.

The smooth transition from flange thickness to pipe wall thickness produces an endurance strength of welding neck flanged assemblies similar to that of a butt welded joint between pipes, which, in practice, is the same as that of unwelded pipe. Thus 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.

Tri-Lad manufactures Welding Neck flanges to the following Specifications.

• CSA
• API 605
• ASME/ANSI B16.47 Series A
• ASME/ANSI B16.47 Series B
• ASME/ANSI B16.5
• INDUSTRY STANDARD
• MSS SP44
• AWWA C207