weld neck flange and long weld neck flange

Weld neck flange and long weld neck flange are similar. They all have neck. But the neck of long weld neck flanges are longer than weld neck flange.

A weld neck flange is a type of flange which is easy to recognize. There are two designs. The regular type is used with pipes. The long type is unsuitable for pipes and it is used in process plant. A weld neck flange consists of a circular fitting with a protruding rim around the circumference. Generally machined from a forging, these flanges are typically butt welded to a pipe. The rim has a series of drilled holes that permit the flange to be affixed to another flange with bolts.

Long weld neck flange is often used as a nozzle for a barrel or column. In addition, there are the type LWN Heavy Barrel (HB) and the Equal LWN Barrel (E); they have a different shape and a thicker "Wall".