Weld Neck Flange

Weld Neck Flange

Flanges are made with a protruded ridge or a rim, which is present in the external or internal region of a piping system. These components allow for a reliable solution aimed at joining various applications together. They add flexibility and help in maintaining the integrity of the system. The items can be easily dismantled and can provide access to different parts of the pipeline.

What is the purpose of a weld neck flange?

Weld-neck flanges are a popular flange for high-pressure and temperature applications. These components can be easily identified by a long or protruding hub. This hub is directly butt welded to pipe to provide a natural and reliable connection. The tapered hub helps in distributing equal weight throughout the entire pipe. It creates a smooth transition towards all the elements and helps prevent any turbulence across the system. Furthermore, these modules provide support to different pipes, tubes, valves as they are put through vigorous stress while processing different fluids and gases. It can also be utilized to help reduce low cycle fatigue, which is generally caused by line expansion and several other variable forces.

How does a weld neck flange work?

These components are known for the tapered hub, which comes in two designs. This hub acts as a support device and supports several items through vigorous grinding and movement of fluids or gases. Once the flange is welded to the pipe it shares the stress of the pipe. It also helps in the reduction of the concentration of stress from the base to the hub. They are well suited for applications in hostile environments where stress along with temperature and pressure parameters are at the highest. Its supreme resilience in this condition due to its unique chemical make-up allows it to be used in pressures up to 5000psi.

What is the strongest type of piping flange and why?

Weld-neck flanges are the strongest flange within the piping industry. The high level of joint integrity in these components is due to the butt-welding procedure followed while welding it to the pipe. Furthermore, the internal diameter of the flange is similar to the pipe, which helps in cross-sectional flow. This gives these elements excellent integrity along with high structural strength with stress distribution across the system.

What are weld neck flange faces?

These elements are available with a raised face, flat face, and ring typeface. They are also available in a male/female and a tonge and groove face, which are very uncommon. RF flange is the most common and is widely seen in various process plants. They are raised so that the gasket can be inserted and a tight seal can be attained in the system. A FF flange component possesses a gasket surface in the same plane as a bolting circle. They are widely used in applications where flanges are produced due to casting. An RTJ flange is preferred in high-pressure and elevated temperature systems. The grooves on their face, which seal ring gaskets as they are bolted with screws or nuts.

When would you need to use a welding neck flange?

These components are expensive and are preferred in limited applications. They are utilized in critical and severe conditions. Some of these conditions include high pressures, fluctuating temperature system. They are also seen in  volatile compounds, and hazardous items, which require to be kept in check.

Where do you use a welding neck flange?

These components are designed to provide support to high pressures/temperatures fluids and gases as they travel the system. They are widely seen in steam lines, oil and gas pipelines, refined hydrocarbons, petrochemical facilities, firefighting structures, etc. The items are preferred in environments where leaks must be prevented. Apart from this, they are used in modules to reduce the number of welds to prevent corrosion.

What are its advantages & limitations?

In these flanges, the long neck forms an integral and important part of piping systems. They have a high and rigid load carrying capacity and can easily assemble an automated production line. The labor cost while producing these components is greatly reduced due to lower welding stress. Apart from this, the entire structure can be easily installed.

The flanges of this range have a few limitations, one being that the flange thickness, is less and there is a considerable difference between the lower and upper sections. This creates certain difficulties in its formation. They can also be produced following a limited processes making, them a little expensive.

Ramesh Steel Corporation