Long Weld Neck Flange: Features and Industrial Applications

Long Weld Neck Flange: Features and Industrial Applications

A Long Weld Neck Flange, commonly called an LWN flange, is a specialized flange with a longer neck than a standard weld neck flange.

Its extended hub provides additional structural support and can help connect piping systems with equipment such as pressure vessels and heat exchangers.

Why Use a Long Weld Neck Flange?

The extended neck can provide a smooth transition between the pipe and flange while reducing stress concentration.

Long weld neck flanges are commonly considered for applications involving:

• High pressure
• High temperature
• Heavy-duty equipment
• Pressure vessels
• Process piping

Common Applications

LWN flanges are widely used in:

• Oil and gas facilities
• Petrochemical plants
• Refineries
• Power plants
• Pressure vessel systems

Manufacturing Process

A high-quality LWN flange normally requires accurate forging and machining.

The typical production process includes:

1. Raw material inspection
2. Heating and forging
3. Heat treatment
4. CNC machining
5. Drilling
6. Dimensional inspection
7. Surface finishing

Because the flange neck is an important structural component, accurate machining and material control are essential.

As an experienced China steel flange manufacturer, we supply long weld neck flanges in carbon steel, stainless steel, and alloy steel according to customer specifications and applicable standards.