7 Types of Flanges Every Industrial Customer Should Know

Written by Amombi Emmanuel
December 15, 2025
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types of flanges used in industrial piping systems

Flanges are an integral component in many industrial applications, especially in the construction, petrochemical, and oilfield industries. They are used to connect pipes, valves, pumps, and other equipment in a piping system. A flange provides a secure and leak-proof joint, which is critical in applications where fluids or gases are transported at high pressures or temperatures.

For professionals new to piping systems, understanding what is a flange and how different flange types and uses vary by application helps ensure safe, reliable, and serviceable connections.

In this blog post, we will discuss the seven most common types of flanges used in industrial settings.

Blind Flange

A blind flange is a flat plate with bolt holes that is used to close the end of a piping system. It is commonly used in applications where future expansion or maintenance may be required. Blind flanges are also used to cap off pipes or valves that are not in use. They are available in a range of sizes and materials to suit different applications.


Weldneck Flange

A weldneck flange is a type of flange that has a long tapered hub and a neck that is welded to the pipe. The neck provides reinforcement to the pipe and allows for easy alignment during installation. Weldneck flanges are commonly used in high-pressure applications or in pipelines that carry corrosive fluids. They are available in various sizes and materials.


Slip on Flange

A slip-on flange is a flat plate with a bore that slips over the end of a pipe. The flange is then welded to the pipe, creating a secure and leak-proof joint. Slip-on flanges are commonly used in low-pressure applications or in pipelines that carry non-corrosive fluids. They are available in a range of sizes and materials.

Socket Weld Flange

A socket weld flange is a type of flange that is welded to the pipe using a socket weld connection. The socket weld connection provides a high-strength joint and allows for easy alignment during installation. Socket weld flanges are commonly used in high-pressure applications or in pipelines that carry corrosive fluids. They are available in various sizes and materials.


Threaded Flange

A threaded flange is a type of flange that has threads on the inside bore and outside diameter. The flange is screwed onto the pipe, creating a secure and leak-proof joint. Threaded flanges are commonly used in low-pressure applications or in pipelines that carry non-corrosive fluids. They are available in a range of sizes and materials.


Lap Joint Flange

A lap joint flange is a type of flange that is used with a stub end. The stub end is welded to the pipe, and the lap joint flange is bolted to the stub end. Lap joint flanges are commonly used in applications where frequent disassembly is required. They are available in various sizes and materials.


Long Weldneck Flange

A long weldneck flange is similar to a weldneck flange, but it has a longer neck. The longer neck provides additional reinforcement to the pipe and allows for easy alignment during installation. Long weldneck flanges are commonly used in high-pressure applications or in pipelines that carry corrosive fluids. They are available in various sizes and materials.

Long Weld Neck Flange | A105 | Domestic

$ 97.26

Long Weld Neck Flange | A105 | Import 2

$ 131.84

Long Weld Neck Flange | A105 | Import

$ 75.11

Long Weld Neck Flange | A105 | Domestic 2

$ 170.65

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How to Choose the Right Flange for Your Application

Selecting the right flange depends on pressure rating, operating temperature, material compatibility, and installation requirements. Knowing the different types of flanges allows engineers and procurement teams to match the flange design with system demands and long-term maintenance needs.

Conclusion

In conclusion, flanges are a critical component in industrial piping systems. Choosing the right type of flange for your application can ensure a secure and leak-proof joint, which is essential for maintaining the safety and efficiency of your operation. This overview of flange types and uses is intended to help industrial buyers make informed piping decisions.

Whether you need a blind flange, weldneck flange, slip on flange, socket weld flange, threaded flange, lap joint flange, or long weldneck flange, Trupply has you covered with a wide range of options in different sizes and materials.

Contact us today to learn more about our flange collections and how we can help you find the right solution for your needs.

Trupply is the leading Pipes, Flange & Fittings industrial supplier for construction, petrochemical, and oilfield customers because we offer competitive prices, exceptional customer service, and reliable delivery times. Visit us at www.trupply.com to learn more.

FAQs

1. What is a flange in piping systems?

A flange is a mechanical component used to connect pipes, valves, pumps, or equipment, allowing easy assembly, inspection, and maintenance of piping systems.

2. What are the most common flange type options?

The most common flange type options include blind, weld neck, slip on, socket weld, threaded, lap joint, and long weld neck flanges.

3. How do flange types and uses differ in industrial applications?

Flange types and uses differ based on pressure, temperature, corrosion resistance, and installation requirements, making proper selection critical for system performance.

4. Which flange is best for high-pressure piping?

Weld neck and socket weld flanges are commonly used in high-pressure applications due to their strength and reliable load distribution.

5. Where can I buy industrial flanges online in the USA?

You can source a wide range of certified industrial flanges from Trupply, a trusted supplier offering quality products, competitive pricing, and dependable delivery.