What is Weld Neck Flange, Material Types, and Specifications

 



What is Weld Neck Flange?

What is Flange? The weld neck flange (WN flange) has a neck that relocates the pipe’s stress, thereby reducing the pressure collected in the flange bottom. This product is compatible with pipelines that work in high- or low-temperature conditions and bear high pressures. When the PN is greater than 2.5 MPa, it is specially designed for the pipe or the valve.

Two Shapes of Welding Neck Flange

A welding neck flange with hub comes in two shapes, one that has a reducing neck, referred to as a reducing weld neck flange manufacturers, and one that has a typical long neck, referred to as a long neck weld flange. A welding neck flange comes in two shapes, one that has a reducing neck, referred to as a reducing weld neck flange weld, and one that has a typical long neck, referred to as a long neck weld flange. Ss weld neck flange dimensions. Welded neck flange, Weld Neck flanges, long weld necks, long weld neck flange.

Reducing Weld Neck Flange

Due to its name, it is like a combination of a pipe reducer and flange, so it could be directly welded to a smaller pipe.

Long Weld Neck Flange

Often referred to as LWN flanges, the neck part resembles an elongated pipe with a flange attached. As a result, it is typically used as a nozzle for a column or barrel.

If you need a heavy LWN flange with a larger thickness and a different shape, you can choose from a normal thickness long welding neck flange.

 

Types of Flanges

Slip On flange.

Slip On flanges have a calculated strength of two-thirds that of Welding Neck flanges, and their fatigue life is one-third as long as Welding Neck flanges.

A flange is connected to a pipe by two filet welds, both on the outside and on the inside.

Socket Weld flange

Initially, socket weld flanges were developed to be used on small-sized high pressure piping. The static strength of these flanges is the same as that of Slip On flanges, but their fatigue strength is 50% higher than that of double-welded Slip On flanges.

In order to connect the pipe to the flange, there is one filet weld at the outside of the flange. A space must be created between the pipe and the flange or fitting prior to welding.

According to ASME B31.1 1998 127.3, Preparation for Welding (E) Socket Weld Assembly.

Prior to welding, the pipe or tube should be inserted into the socket to maximum depth and then withdrawn approximately 1/16″ (1.6 mm) away from contact between the end of the pipe and the socket shoulder.

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