Long weld neck flange

A long weld-neck flange has an integral neck or hub extended beyond the geometry of a conventional weld-neck flange. This longer, pipe-like transition between the flange body and weld end is the defining distinction from the standard weld-neck identity. Its duty, neck length, bore and connection details must be selected from the relevant piping or equipment drawings. The name alone does not establish vessel-nozzle service, a reinforcement function, a standard, pressure class or one bore configuration.