Flanges are essential components in pipeline systems, connecting pipes, valves, and other equipment. Lap joint and slip-on flanges are two of the most frequent types of flanges used in industrial pipes. Both of these flanges are intended to perform various functions, and recognizing their differences will help you select the best one for your unique requirements.
Newzel Industries manufactures and supplies high-quality flanges, including lap joint and slip-on flanges, in a variety of materials such as stainless steel, carbon steel, and alloy steel. In this blog, we will look at the distinctions between lap joint flanges and slip-on flanges, including their features, benefits, applications, and where to utilize each type.
What is a Lap Joint Flange?
A lap joint flange is a flange that is intended to fit over a pipe. It has a cylindrical neck that slides over the pipe, rather than being welded to it. Instead, it is fastened to the system using a stub end flange. The stub end is welded to the pipe, and bolts connect the lap joint flange to it.
The primary benefit of lap joint flanges is that they can be rotated to line with bolt holes in the piping system, making them easier to install and remove. This flange is best suited for applications that require frequent disassembly for maintenance, inspection, or cleaning.
What is a Slip-On Flange?
A slip-on flange, as the name implies, fits over the pipe and is then welded both inside and out to form a strong and solid connection. Slip-on flanges are more permanent than lap joint flanges since they are welded directly to the pipe. These flanges are commonly utilized in systems where the flange does not need to be rotated or disassembled after installation.
Slip-on flanges are manufactured in a variety of materials, including carbon steel, stainless steel, and alloy steel, and are intended for medium to low-pressure applications. They are simple to use and inexpensive for various plumbing systems.
Lap Joint Flange vs Slip-On Flange: Key Differences
| Feature | Lap Joint Flange | Slip-On Flange |
| Design and Installation | A lap joint flange is not welded directly to the pipe, but rather over a welded stub end flange. | A slip-on flange is welded directly to the pipe, both inside and out. |
| Flexibility and Maintenance | Lap joint flanges offer greater flexibility due to their ability to rotate, making it easier to align bolt holes and enabling easier disassembly for maintenance. | Slip-on flanges are more rigid and lack the flexibility of lap joint flanges, making them unsuitable for frequent disassembly. |
| Cost and Ease of Use | Lap joint flanges are often more expensive due to its design and the requirement for a stub end flange. | Slip-on flanges are more convenient and cost-effective, particularly for permanent installations. |
| Applications | Ideal for systems that require frequent disassembly, cleaning, or maintenance, such as those in chemical processing, pharmaceuticals, and food manufacturing. | Permanent installations include water treatment, oil and gas pipelines, and HVAC systems. |
| Pressure Rating | Typically used for medium-pressure systems. Design constraints make it unsuitable for high-pressure applications. | Suitable for medium to low-pressure systems, however welding restrictions may make it unsuitable for high-pressure applications. |
| Size and Variety | Lap joint flanges are available in bigger sizes and are commonly utilized for large diameter pipes that require flexibility during installation. | Slip-on flanges come in conventional sizes and are often used on medium to small diameter pipes. |
When should you choose lap joint flanges over slip-on flanges?
Lap joint flanges are ideal for systems that require frequent disassembly and repair. They are commonly employed in industries such as pharmaceuticals, food processing, and chemical processing, where frequent inspection, cleaning, or part replacement is required.
When to Choose Slip-On Flanges Over Lap Joint Flanges?
Slip-on flanges are suited for permanent installations that do not require regular maintenance or disassembly. These flanges are often utilized in water, HVAC, and oil and gas applications, where the pipe system is intended to last for long periods of time without frequent maintenance.
Conclusion
The decision between lap joint flanges and slip-on flanges is based on the unique needs of your piping system, such as ease of disassembly, pressure requirements, and cost considerations. Newzel Industries provides both types of flanges in a variety of materials and sizes to fulfill the needs of your projects. Whether you’re dealing with a high-maintenance industrial setup or a permanent plumbing installation, our knowledgeable staff can help you choose the best flange for your requirements.
For additional information on lap joint and slip-on flanges, or to obtain a price, please contact us now!
