What is a Slip-On Flange?

Slip-on flange, also referred to as “hubbed flange,” is a type of flange that slips over the end of a pipe. This flange also comes with a low-profile hub. This means the hub does not protrude significantly from the flange’s surface.

Main Features of a Slip-On Flange

A slip-on flange is a widely used component in various piping systems. It is known for its simple yet effective design. This flange can be easily slipped over the pipe’s end. Afterward, it is welded both inside and outside to ensure a leakage-free connection.

Explore Our Slip-On Flange>>>

Slip-On Flange Dimensions

The dimension of slip-on flanges is crucial for selecting the right flange for your project. Slip-on flanges are available in a wide range of sizes — typically from 1/2″ to 60″ in diameter. Their pressure ratings range from 150 lbs to 2500 lbs. Considering these specifications, slip-on flanges are suitable for various applications, from small-scale piping installations to large industrial networks.

Ease of Installation for Slip-On Flanges

As the name implies, you can seamlessly slide this flange onto the pipe to achieve precise positioning before welding. Many users find this quality helpful in minimizing the risk of pipe misalignment. Thus, you can achieve a secure and reliable connection. This ease of use makes slip-on flanges a go-to option for projects where time and accuracy are critical.

Versatility of Slip-On Flanges

Slip-on flanges are compatible with both seamless and welded pipes. They are also available in different materials such as carbon steel, stainless steel, and alloy steel. Some manufacturers even make tailored slip-on flanges to meet their customers’ specific needs.

Slip-On Flanges Are Cost Effectiveness

Thanks to their simpler design and reduced material usage, slip-on flanges are generally more affordable than other flange types. This makes slip-on flanges an attractive option for piping networks where budget constraints are a concern.

Slip-On Flanges Has Reduced Welding Requirements

Compared to weld neck flanges, slip-on flanges require less welding, which simplifies the installation process. The welding typically involves securing the flange to the pipe by welding around the outer and inner diameters.

How Do Slip-On Flanges Work?

A slip-on flange works by providing security and leak-resistant connection between pipes or fittings. The slip-on flange’s design enables it to be ideal for low-pressure piping systems.

The installation process starts with slipping the flange over the end of the pipe. The flange’s inner diameter and the pipe’s outer diameter must match. A precise fit is needed to obtain a consistent flow path within the system.

After being properly positioned, the flange is welded in place to ensure a stable and durable connection. The welding process involves applying welds on both the inside and outside of the flange. It is also essential for preventing leaks and keeping the flange in place while in operation.

Slip-On Flange Types

To accommodate various demands and environments, slip-on flanges come in different types. the 3 most commonly used slip on flanges are standard slip-on flange, slip-on raised-faced flange, and slip-on ring-type joint flange.

Standard Slip-On Flange

The standard slip-on flange is the most common type used across various piping systems. It is designed to slip over the pipe. The pipe end extends slightly beyond the flange face before being welded.

Raised Face Slip-On Flange

The raised face slip-on flange features a small portion extruded from the bottom face of the flange, known as the raised face. This area serves as a gasket seat during installation, providing improved sealing performance. As the pressure rating increases, the height of this raised face also increases.

RTJ Slip-On Flange

The RTJ (Ring Type Joint) slip-on flange includes a small groove machined into the raised face. This groove is designed to accommodate a gasket ring, enhancing the flange’s sealing capabilities. The RTJ slip-on flange is particularly suited for high-pressure applications where a more robust seal is required.

Comparison Table: Types of Slip-On Flanges

Slip-On Flange Uses

Because of their versatility, slip-on flanges have become in demand in a wide range of industries. Below are some of the common slip-on flange applications:

Low-Pressure Piping Systems

Slip-on flanges are perfect for low-pressure piping systems. In such scenarios, ease of installation and cost-effectiveness are prioritized over high strength. These flanges are typically used in water distribution systems.

Chemical Processing Plants

Chemical-processing plants often use slip-on flanges. The latter’s ability to handle different ranges of chemicals and fluids. The flange under consideration can be made from stainless steel and other corrosion-resistant alloys.

HVAC Systems

Heating, ventilation, and air conditioning (HVAC) systems often opt for slip-on flanges. The flanges provide a secure connection and can be easily installed and adjusted as needed.

Shipbuilding and Marine Applications

The main features of slip-on flanges are widely used in the shipbuilding industry. Here, the flanges are used in piping systems on board ships and other marine vessels.

Water, Gas, and Oil Pipelines

In the oil and gas industries, slip-on flanges are useful in pipelines that transport water, gas, and oil. Many engineers favor these flanges because they are more economical while providing robust connections in low-pressure settings.

Meet Longan Flange

If you are seeking high-quality slip-on flanges, Longan Flange is a manufacturer you can trust. Longan specializes in producing different types of flanges. The team also offers customization options to meet specific project requirements.

With over 100 CNC lathes and 10 machining lathes for heavy-duty processing, Long’an Flange can produce flanges with high precision and consistency. The company operates 16 high-precision machining centers. This explains why Longan Flange meets the highest standards of quality and accuracy.

Frequently Asked Questions

Are slip-on flanges appropriate for underground sewage systems?

Slip-on flanges are not recommended for underground sewage systems. This is due to the required welding process in such a context. According to experts, it is better to use flange adapters. Looking for other more suitable flanges may also work.

Is any specific surface preparation needed before welding slip-on flanges?

For better results, you may thoroughly clean slip-on flange surfaces. This practice ensures that the flange is free of debris or contaminants before welding.

Are slip-on flanges suitable for steam systems?

You may use slip-on flanges for steam piping systems. However, remember that their suitability still depends on the specific pressure and temperature conditions. Before buying slip-on flanges for steam systems, first, verify the application requirements. Consulting relevant standards may also help.

Do slip-on flanges provide a leak-proof connection?

When properly installed and welded, slip-on flanges can provide a secure connection that minimizes the risk of leaks.