Skip to content

5 Important Questions to Ask About Pipe Flange

Most people need to learn what long weld neck flanges are and their use. Some people work in specific industries that encounter the flanges each day. Here you will understand everything you need to know about the basic flanges, including the long weld neck flanges.

Weld-neck flanges


Where do you use flanges the most?

A flange comes disc-shaped, and we use them mostly when building pipelines. According to the Pipeline and Hazardous Materials Safety Administration, 1,382,569 million miles of pipelines deliver oil and gas daily. Long weld necks and other kinds of flanges are a part of pipeline engineering. Flanges are one of the essential parts of pipeline engineering. We use them to connect pipes together and ensure the proper seal.

What is the function of flanges?

Flanges are useful to connect pipes and can also help connect chuck valves, T, and other pipeline parts. Therefore, we consider them a mechanical way to connect pipelines and their parts.

You can weld flanges sometimes, and in other cases, you can hold them together with the fasteners. It all depends on the pipeline engineering and where you can use the flange to determine how well you can connect them.

What are the different flange types?

There are many flanges designed for different purposes. For example, there are high hub flanges, expander flanges, long weld neck flanges, anchor flanges, blind flanges, and more. Within each kind of flange category, there are subcategories.

The metal material may vary, the sizes vary, and how the flange is attached may vary. You can get a lot to learn about the flanges. A proper flange is essential to get off the right seal. A too-large or too-small flange will throw the entire design off.

What is the height of the face in the raised face flange?

The height of the flange face should not be random but, instead, based on the flange ratings. For example, for 300# & 150#, the height of the raised face is 1/16”, which is approximately 1.6 mm, and above 300#, it is 1/4”, which is 6.35 mm.

What is the serration on the flange face, and what type is used on flange faces?

Flange faces could be serrated and smooth type. The flange face with small grooves is known as serration.

The serration is critical as it helps prevent leakages from the flange. Even small damage to the face may lead to the plant shutdown. Thus, if you are working with a flange, ensure to take measures and protect the flange while handling it.

Serration could be concentric or spiral rings. When we talk about concentric ring-type finishing, it is when the fluid used is of very low density. If you use the spiral-type finish with lower-density fluid, it may find a leakage path through the spiral cavity.


The above questions clearly define the pipe flange. The right source, like Texas Flange, will likely offer you a wide variety of high-quality flanges that will fit the project’s needs. Texas Flange will also be able to answer questions and make suggestions to ensure you get the right flange for your project. Call Texas Flange to learn more about our quality flange and how they enhance pipeline projects worldwide.

0 0 votes
Article Rating
Notify of
1 Comment
Newest Most Voted
Inline Feedbacks
View all comments