weld neck flange

Welded neck flange (WN flange) has a neck and it is designed to transfer stresses to the pipe, thereby reducing high stress concentrations at the base of the flange. It is compatible to the pipelines that works in high or low temperature and bear high pressure. Specially for the pipe or the valves when PN is larger than 2.5 Mpa.

Socket weld flanges are a less common but equally effective connection for flanges which require less overall available space than a traditional weld neck flange, with a counterbore in the center to allow for a clean weld of pipe into the socket.