Sch 80 CPVC Flanges & Their 7 Latest Different Types


If you are in need of dependable and durable flanges for your industrial projects, Sch 80 CPVC Flanges might just be the item for you. Designed to withstand high temperatures and corrosive environments, these flanges offer unparalleled strength and reliability.

Whether you’re working in chemical processing, water treatment, or any other demanding industry, Sch 80 CPVC Flanges are the ideal choice to ensure a secure and leak-free connection. With their easy installation and long-lasting performance, you can rest assured that your projects will be completed with precision and efficiency. Trust Sch 80 CPVC Flanges for all your industrial flange needs.

Definition of Sch 80 CPVC Flanges

Sch 80 CPVC (Chlorinated Polyvinyl Chloride) flanges are pipe fittings used to connect pipes and create a tight seal. They are made from a combination of CPVC material, which is known for its high strength and resistance to corrosion, chemicals, and high temperatures. 

Sch 80 refers to the Schedule 80 rating of the flanges, indicating their ability to withstand high pressure and heavy-duty applications. These flanges are designed to meet specific dimensions and standards to ensure compatibility with CPVC pipes.

Importance and Uses of Schedule 80 CPVC Flanges

Sch 80 CPVC flanges are commonly used in industrial settings where there is a need for reliable and durable pipe connections. They are widely used in applications such as chemical processing plants, water treatment facilities, and power generation plants.  The importance of Sch 80 CPVC flanges lies in their ability to create secure and leak-free connections, ensuring the efficient flow of fluids and gases within the piping systems.

Overview of Sch 80 CPVC Material

CPVC stands for Chlorinated Polyvinyl Chloride, a thermoplastic polymer known for its exceptional durability and resistance to harsh environments. It is a special type of PVC that has undergone a chlorination process, resulting in improved temperature resistance and chemical compatibility. CPVC material is especially suitable for handling hot liquids or corrosive substances. It offers excellent mechanical strength, impact resistance and can withstand high pressures.

You need to know different flanges before buying for your pipe system.

cpvc flangesBlind Flanges

Blind flanges are used to seal the threaded end of a pipeline, preventing the flow of fluids or gases. They are solid discs with bolt holes around the perimeter, allowing them to be securely bolted to the corresponding flange on the pipe end. Blind flanges are commonly used when there is a need for future expansion or maintenance, as they can easily be removed and replaced.

Threaded Flanges

Threaded flanges have internal threads that allow them to be screwed onto threaded pipes. They provide a strong connection that is resistant to loosening due to vibrations or fluctuations in temperature. Threaded flanges are often used in low-pressure applications or where the pipes need to be easily dismantled.

Weld Neck Flanges

Weld neck flanges have a long tapered hub that provides reinforcement and support to the flange. They are designed to be welded directly to the pipe, resulting in a strong and permanent connection. Weld neck flanges are commonly used in high-pressure and high-temperature applications, as they offer excellent structural integrity and resistance to leakage.

Lap Joint Flanges

Lap joint flanges consist of two parts: a stub end and a loose backing flange. The stub end is welded to the pipe, while the backing flange is free to rotate around the stub end. This design allows for easy alignment and adjustment during installation. Lap joint flanges are often used in applications where frequent dismantling is required.

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Slip-on Flanges

Slip-on flanges are slightly larger than the pipe, allowing them to slip over the pipe end easily. They are then welded both inside and outside to provide a secure connection. Slip-on flanges are popular due to their ease of installation and cost-effectiveness. They are commonly used in low-pressure applications.

Socket Weld Flanges

Socket weld flanges have a socket or recess into which the pipe end fits. The pipe is then welded to the flange socket for a strong connection. Socket weld flanges are used in applications where there is a need for high strength and reliability, particularly in high-pressure piping systems.

Van Stone Flange

The Van Stone flange is a two-piece flange with a rotating ring that simplifies bolt alignment. This flange has one female threaded end connecting to a male fitting or nipple.

Durability and Lifespan

Schedule 80 CPVC flange is highly durable and has a long lifespan. CPVC material offers excellent strength and resistance to impact, making the flanges suitable for withstanding heavy loads and harsh environments. With proper installation and maintenance, Sch 80 CPVC flanges can serve reliably for many years.

Temperature Resistance

One of the key properties of CPVC material is its exceptional temperature resistance. Sch 80 CPVC flanges can withstand high temperatures up to 200°F (93°C) without losing their structural integrity or experiencing significant degradation. This makes them ideal for applications where hot fluids or gases are transported.

Corrosion and Chemical Resistance

Sch 80 CPVC flanges exhibit excellent resistance to corrosion and a wide range of chemicals. The CPVC material is inherently resistant to many acids, alkalis, salts, and oxidizing agents. This resistance allows Sch 80 CPVC flanges to be used in corrosive environments without the risk of deterioration or failure.

Pressure Handling Capacity

Sch 80 CPVC flanges are designed to handle high-pressure applications. The Schedule 80 rating indicates they can withstand higher internal and external pressures than lower schedule ratings. This makes Schedule 80 CPVC flanges suitable for industrial applications where robustness and pressure resistance are crucial.


Sch 80 CPVC flanges come in various dimensions to accommodate different pipe sizes. The flange’s outer diameter and the pipe’s inner diameter should match for a proper fit. The dimensions of Sch 80 CPVC flanges are standardized and follow industry-specific standards to ensure compatibility and interchangeability.

Bolt Circle Diameter

The bolt circle diameter refers to measuring the circle formed by the bolting holes on the flange. This diameter determines the size and spacing of the bolt holes. The bolt circle diameter of Sch 80 CPVC flanges is specified according to the pipe size and van stone flange standard.

bolt holesNumber of Bolt Holes

The number of bolt holes on a Sch 80 CPVC flange depends on size and pressure rating. Generally, flanges with larger diameters or higher pressure ratings have more bolt holes to distribute the load evenly. The number and arrangement of bolt holes adhere to specific standards to ensure proper installation and structural integrity.

Nominal Size

The nominal size of Sch 80 CPVC flanges refers to the pipe size they are compatible with. Selecting the correct nominal size is important to ensure a secure and leak-free connection. The nominal size of the flange should match the outer diameter of the pipe it is connected to.

See also  Sch 80 CPVC Elbows

Regular Cleaning

Regular cleaning is essential to maintain the performance and longevity of Sch 80 CPVC flanges. Dirt, debris, and chemical deposits can accumulate on the surface of the flanges, leading to potential issues such as leakage or reduced flow capacity. Cleaning can be done using a mild detergent, CPVC-specific cleaning solution, and a soft-bristle brush or cloth.

Periodic Checks for Damages

Periodic checks for damages should be carried out to identify any signs of wear, cracks, or corrosion on Sch 80 CPVC flanges. Visual inspections can help detect any visible issues, while pressure tests or leak tests can be conducted to ensure their functionality. Any damaged flanges should be promptly replaced to avoid compromising the integrity of the piping system.

Replacement of Damaged Flanges

In cases where Sch 80 CPVC flanges are damaged, it is crucial to replace them to maintain the efficiency and safety of the overall system. Damaged flanges can leak, leading to costly repairs, environmental hazards, or even accidents. Replacement flanges should be of the same specifications and properly installed to ensure a secure connection.

Safety Measures During Maintenance

During maintenance activities involving Sch 80 CPVC flanges, it is important to adhere to safety procedures to prevent accidents or injuries. This includes wearing appropriate personal protective equipment, following proper handling guidelines for chemicals or solvents, and ensuring the area is well-ventilated. It is also advisable to perform maintenance during scheduled shutdowns or when the system is inactive.


Leakage Issues

One of the most common issues with Sch 80 CPVC flanges is leakage. Leaks can occur due to poor installation, flange damage, or sealing material degradation. It is important to address leaks promptly to prevent further damage to the piping system and ensure fluid or gas flow integrity.

Issues with Incorrect Installation

Incorrect installation can lead to various issues with Sch 80 CPVC flanges. These include misalignment, improper torquing of bolts, insufficient sealing, or inadequate pipe surface preparation. Improper installation can result in leakage, reduced flow capacity, or even structural failure of the flanged connections.

Issues Arising from Physical Damage

Physical damage to Sch 80 CPVC flanges can occur due to external factors such as impact, extreme temperatures, or chemical exposure. Physical damage can compromise the structural integrity of the flange and lead to leakage or failure. Regular inspections and prompt replacement of damaged flanges are essential in preventing potential issues.

Faulty Manufacturing Defects

In rare cases, Sch 80 CPVC flanges may have manufacturing defects affecting their performance or reliability. These defects include dimensional inaccuracies, weak spots, or faulty material composition. Flanges with manufacturing defects should be identified and replaced immediately to avoid potential risks or failures.

Identifying the Issue

issues with flangesThe first step in solving common issues with Sch 80 CPVC flanges is identifying the specific problem. This can be done through visual inspections, pressure tests, or leak tests. Identifying the root cause of the issue will help determine the most appropriate solution and prevent further complications.

Proper Maintenance and Care

Proper maintenance and care of Sch 80 CPVC flanges can help prevent common issues from occurring. This includes regular cleaning, inspections, and adherence to installation and maintenance guidelines.

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Many issues can be avoided by following best practices, such as using the correct tools and materials, applying solvent cement correctly, and ensuring proper alignment during installation.

Approach to Repairing Damaged Flanges

If a Sch 80 CPVC flange is damaged but repairable, the appropriate approach should be taken to restore its functionality. This may involve removing the damaged portion, applying a patch or sealant, or reinforcing the weakened areas. Repairs should be carried out by qualified professionals with expertise in working with CPVC materials.

When to Replace the Flange

In some cases, replacing a Sch 80 CPVC flange may be necessary rather than attempting to repair it. This is particularly true for severe damage, significant deterioration, or when the van stone flange no longer meets the required standards. Replacement flanges should be of the same specifications and installed correctly to ensure compatibility and maintain the integrity of the piping system.

Material Standards

When purchasing Sch 80 CPVC flanges, ensuring that the material meets the required standards is important. CPVC material should comply with industry-specific strength, temperature resistance, and chemical compatibility standards. This ensures the flanges are suitable for the intended application and perform reliably in the desired conditions.

Dimensional Standards

They should adhere to specific dimensional standards to ensure compatibility with CPVC pipes and other flanged components. The flanges should have accurate measurements and appropriate tolerances to ensure a proper fit and secure connection. Checking for compliance with dimensional standards is essential to prevent issues during installation or operation.

Seller Reputation

When purchasing Sch 80 CPVC flanges, buying from reputable sellers or manufacturers is advisable. Sellers with a good reputation for quality and customer service are more likely to provide reliable and genuine products. Researching the seller’s reputation, reading customer reviews, and seeking recommendations can help ensure a satisfactory purchasing experience.

Budget and Pricing

Pricing is an important consideration when purchasing Sch 80 CPVC flanges. It is essential to compare prices from different sellers to ensure a fair and competitive deal. However, it is equally important to consider the overall value offered, including material quality, dimensional accuracy, and manufacturer reputation. Striking a balance between budget and quality can help make an informed purchasing decision.

In conclusion, Schedule 80 CPVC flanges are essential for industrial piping systems. They provide reliable and durable connections, ensuring the efficient flow of fluids and gases. With excellent physical properties, such as temperature resistance, corrosion resistance, and pressure handling capacity, they are suitable for various applications.

Proper installation, maintenance, and care are crucial for maximizing their performance and lifespan. Pipe Xpress is a leading pipe supplier that you can trust. You can purchase PVC fittings and CPVC valves, drainage pipes, and more. Just call us at 610-918-7120.

By considering important factors, such as material standards, dimensional standards, seller reputation, and budget, when purchasing Sch 80 CPVC flanges, one can ensure a successful and cost-effective solution.

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