Different Types of Flanges Used in Industrial Piping and Plumbing Systems

Flanges are one of the most important components used in piping and plumbing systems across different industries. Whether it is oil and gas, chemical plants, water supply systems, or manufacturing units, flanges play a key role in connecting pipes, valves, pumps, and other equipment in a secure and leak proof manner.

A flange is a mechanical connector used to securely join pipes, valves, pumps, and other equipment in a piping system. It allows easy installation, removal, maintenance, inspection, and replacement of pipeline sections without cutting or welding the entire piping network or industrial system.

What is a Flange?

A flange is a flat or raised ring shaped component used to connect pipes, valves, pumps, or other equipment in a piping system. It is usually joined using bolts and nuts, and a gasket is placed between two flanges to ensure a tight seal.

Flanges are widely used because they make maintenance easy. Instead of cutting or welding pipes, workers can simply unbolt the flange connection and access the system.

In industries, companies like Seven Eleven Industries provide high quality flange solutions for various piping, plumbing, and industrial applications, ensuring excellent safety, long-lasting durability, reliable performance, and secure pipeline connections for different operational and commercial requirements.

Importance of Flanges in Piping Systems

Flanges are used for many reasons in industrial systems:

• Easy installation and removal of pipes in industrial systems

• Strong and leak-proof pipeline connection for secure operations

• Suitable for high pressure and high temperature applications

• Helps in system modification, inspection, and maintenance work

• Compatible with different pipe materials and piping systems

Because of these valuable benefits, flanges are widely preferred over permanent welding in modern piping systems for easy maintenance, quick installation, flexible connections, convenient inspection, and simple replacement work without damaging the overall pipeline structure or system performance. 

Different Types of Flanges

There are several types of flanges used in industrial piping and plumbing systems. Each flange type is designed for a specific purpose based on factors such as pressure rating, temperature conditions, pipe material, fluid type, and the overall application requirements of the piping system.

1. Blind Flange

A blind flange is a solid type of flange that does not have a center hole or opening. It is mainly used to seal or close the end of a pipe, valve, or pressure vessel opening, helping prevent the flow of liquids or gases within the piping system.

It is mainly used when a pipeline needs to be closed for maintenance or future expansion. Blind flanges are very strong and can handle high pressure.

2. SORF Flange (Slip On Raised Face Flange)

A SORF flange, also known as Slip On Raised Face flange, is one of the most commonly used flanges in piping systems. The pipe is inserted into the flange and then welded from both inside and outside.

Advantages:

• Easy to align and install in different industrial piping systems without complex procedures

• Cost effective flange option for commercial, plumbing, and industrial applications

• Suitable for low to medium pressure systems requiring secure pipe connections

3. Pipe Flange

A pipe flange is a general term used for flanges attached to pipes for secure joining and connection purposes in different piping systems. It connects two pipes or joins a pipe with equipment like pumps, valves, compressors, or other industrial machinery.

Pipe flanges are available in different materials such as stainless steel, carbon steel, alloy steel, and PVC depending on application needs, pressure requirements, temperature conditions, and the type of fluid used in the piping system.

4. Companion Flange

A companion flange is used to connect a pipe to a valve, pump, or other equipment. It ensures proper alignment and tight sealing between two components.

These flanges are commonly used in water supply systems, industrial machinery, pump connections, oil and gas pipelines, chemical industries, and various manufacturing applications for safe, reliable, and efficient operations.

5. PVC Flange

A PVC flange is made from polyvinyl chloride material and is mainly used in plastic piping systems.

Uses of PVC flange:

• Residential plumbing systems used in homes and buildings for safe water flow

• Water distribution systems for municipal supply, irrigation, and large-scale networks

• Chemical-resistant piping systems used in industries for handling corrosive fluids safely

6. Flange Valve Connection

A flange valve refers to a valve that is connected to a pipeline using flanges instead of threaded or welded joints. This type of connection is commonly used in industrial systems where frequent maintenance is required.

Flange valves provide:

• Easy replacement - Allows quick removal and installation of pipe sections without affecting the entire system setup

• Strong sealing - Provides a tight and secure joint that prevents leakage in piping and fluid handling systems

• Better control over fluid flow - Helps regulate, manage, and maintain smooth flow of liquids and gases efficiently in pipelines

Also Read: Adapters Industries Explained: Types, Uses, and Applications

Flange Bolt and Its Role

A flange bolt is a special type of bolt used to tighten two flanges together. It works along with nuts and washers to ensure a strong and leak-proof connection.

Flange bolts are designed to handle high pressure and vibration. Without proper tightening of flange bolts, the entire piping system may fail or leak.

What is Flange Size?

Flange size refers to the dimensions of the flange, including its diameter, thickness, and bolt hole arrangement. It is important to choose the correct flange size to match the pipe size and pressure rating.

Different industries follow internationally recognized standard sizing systems such as ANSI, DIN, or JIS, to ensure proper compatibility, accurate fitting, and reliable interchangeability across various piping components and industrial applications.

How to Measure Flange Size

Measuring flange size is important for installation and replacement. Here are simple steps:

1. Measure the outer diameter of the flange

2. Check the bolt hole circle diameter (PCD)

3. Count the number of bolt holes

4. Measure the pipe size it connects to

5. Check thickness and pressure rating

Applications of Flanges in Industry

Flanges are used in many industries, including:

• Oil and gas pipelines used for safe transport of oil and gas over long distances

• Chemical processing plants handling corrosive chemicals and high-pressure operations safely

• Water treatment systems for filtration, purification, and clean water distribution

• Power plants supporting steam, water, and high-temperature fluid systems

• Construction and infrastructure projects requiring strong and reliable piping connections

Because of their flexibility, durability, and strong performance, flanges are considered a standard and essential component in almost every type of modern industrial and commercial piping system. 

Conclusion

Flanges are essential components in modern piping and plumbing systems. From blind flange to SORF flange, each type has a specific role in ensuring safe and efficient connections between pipes and equipment. Understanding flange size, bolt usage, and measurement methods is important for proper installation and maintenance.

Industries rely heavily on high-quality flange solutions to maintain safety and performance in their systems. That is why reliable manufacturers like seven Eleven Industries play an important role in providing durable and precision-engineered flange products for different applications.

Frequently Asked Questions

1. What is the main purpose of a flange in piping systems?

To connect pipes, valves, and equipment securely with a strong, leak-proof, and easily removable joint.

2. Which industries commonly use flanges?

Oil, gas, chemical, water treatment, power generation, construction, and manufacturing industries widely use flanges.

3. What is the difference between a blind flange and a pipe flange?

Blind flange seals pipe ends, while pipe flange connects pipes or equipment for fluid flow.

4. How do I choose the correct flange size?

Choose based on pipe diameter, pressure rating, material type, and industrial standard specifications compatibility.

5. Why are flange bolts important?

Flange bolts provide strong tightening, ensuring secure, vibration-resistant, and completely leak-proof pipeline connections.