A Complete Guide to SORF Flange

SORF Flange

As we all know, flanges are an essential component in pipeline systems used in various industries. They connect pipes, valves, and other equipment in the pipeline system. A SORF flange or Slip On Raised Face flange is a type of flange used in pipeline systems. This flange offers benefits like stress resistance, a raised face, and an easy installation. This blog post will provide a complete guide to the SORF Flange, its types, uses, and advantages.

What is SORF Flanges?

SORF Flanges, or Slip on Raised Face Flanges, are pipe fittings that connect pipes or other round equipment. They feature a flat face with two raised surfaces that provide increased mechanical strength and allow for easy installation thanks to their design. They can be made from different materials, such as carbon steel, alloy steel and stainless steel. Additionally, they offer the flexibility to use different types of bar stock material, such as round bars, forged bars, hollow bars or hex bars, depending on application needs. Overall, these flange designs effectively seal joints and keep them airtight at any pressure rating required.

Types of SORF Flange

SORF flanges come in different types depending on various factors, such as pressure classes, dimensions, and compatibility with other equipment. Some common types of are ANSI B16.5, ASME B16.47 SORF Flange, DIN, and BS. Each type has a specific pressure rating, temperature rating, and dimension. Choosing the right type of SORF flange is essential based on the application, pipeline system, and equipment it will be connected to.

Uses of SORF Flange

SORF flanges are commonly used in a variety of applications. The most popular applications include petrochemical, oil and gas, power generation, and water treatment industries. They are used in systems that are prone to thermal expansion or face high pressure or temperature. SORF flanges are known to provide excellent stress resistance and can prevent leaks in high-pressure pipelines.

Advantages of SORF Flange

One of the significant advantages of SORF flanges is that they are incredibly easy to install. They require less machining operation and are lighter in weight compared to other types of flanges. SORF flanges are also less expensive and can be used in low-pressure applications. The raised face of the SORF flange ensures that the gasket seats properly and reduces the risk of leakage. Lastly, SORF flanges are less prone to corrosion, making them ideal for pipelines transporting liquids or corrosive gases.

Installation of SORF Flange

The installation of a SORF flange is relatively easy and straightforward. First, the pipe must be inserted into the flange bore, while the raised face should be aligned with the pipe end. A gasket should then be placed on the raised face, followed by placing another flange on top. The bolts should then be inserted through the holes in the flange, and finally, the nuts should be tightened to ensure a secure fit.


In conclusion, SORF flanges are an excellent option for pipeline systems that face high-pressure or high-temperature applications. They provide excellent stress resistance, have a raised face, and are easy to install. With the different types of SORF flanges available, it is essential to choose the right one based on the pipeline system and the equipment it will be connected to. Proper installation of the SORF flange is also critical to prevent leaks or other damage to the pipeline system. By following the information provided in this blog post, you can ensure that you select and install the right SORF flange for your specific application.