The Types and Uses of Weld Neck Flanges

Weld neck flanges have long tapered hubs that are butt welded to a pipe or fitting. The conditions they are used in are usually severe. Conditions are sometimes constant or have wide fluctuations.

Long Neck Welding (abbreviated LWN) flanges are similar to a standard Welding Neck flange, but the "Neck" is considerably longer. This type 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".

The Two Types of Weld Neck Flanges

There are two types of weld neck flanges, which are standard and long. Standard weld neck flanges are used in butt weld fittings. Long weld neck flanges are used with vessel nozzles and equipment. The flanges are created to match the pipe’s inside diameter or fitting. The reason why it is bored to match is because it reduces the corrosion and turbulence that takes place inside of the pipe.

Long weld neck flanges are called by this name due to their longer neck as compared to standard flanges. These flanges are used in applications as nozzles for columns or barrels.

Applications that Use Weld Neck Flanges

Weld neck flanges are used in applications where the conditions are severe and critical. Some of these conditions include high pressure, wide fluctuations in temperature and pressure, high temperature, fluids that are volatile and hazardous, and temperatures in the sub-zero range.

Meeting ASME Standards

Forged Components offers standard connections in a full range of pressure rating classes and sizes as according to ASME standards of ASME Section VIII Div. 1 and ASME B16.5 in the latest specifications. Connections can also be manufactured to match ASME Section VIII Div. 2 or other specifications desired. ANSI flanges are manufactured according to the material grades and customer’s custom orders.

Standards, Dimensions & Weight of WN flange

The welding neck flange is the best designed butt-welded flange of those currently available becuase of its inherent structural value.