Flange Basics – Explained by an Engineer

Flanges are essential components in piping systems, used to connect pipes, valves, pumps, and other equipment, providing easy access for cleaning, inspection, and modification. Understanding the different types of flanges and their specific applications can help ensure the reliability and efficiency of your system. In this blog, we’ll explore various types of flanges.

Split Flanges (SFS): Split flanges are designed for easy installation and removal without the need to disassemble the connected equipment. They are typically used in high-pressure hydraulic systems where maintenance and repair accessibility are crucial.

Monoblock Forged Flanges (MFS): These are single-piece flanges forged from a solid block of material. They are highly durable and suitable for high-stress applications, providing excellent strength and resistance to deformation.

Buttweld Swivel Flanges (SAO/SAOC/HAO/HAOC): These flanges are designed to accommodate angular movement and slight misalignment in piping systems. They are connected by welding the flange to the pipe, providing a strong and leak-proof joint. The swivel feature allows for easier alignment of bolt holes during assembly, making them ideal for applications requiring frequent disassembly and reassembly.

Buttweld Solid Flanges (SBO/SBOC/HBO/HBOC): These flanges are welded directly to the pipe, creating a permanent and robust connection. They are commonly used in high-pressure and high-temperature applications due to their ability to withstand extreme conditions. The solid design ensures a secure fit and reduces the risk of leaks.

Socket Weld Flanges (SCO/SCOC/HCO/HCOC): These flanges are used in systems with small-diameter pipes. The pipe is inserted into a socket end and welded around the outside, providing a smooth bore and better flow characteristics. They are suitable for high-pressure applications and are easier to install compared to buttweld flanges.

Blind Flanges (OSB/OHB): Blind flanges are used to close off the ends of piping systems or vessels, effectively stopping the flow of fluid. They are essential for maintenance, allowing sections of the system to be isolated. These flanges are capable of withstanding high pressure and are used in a variety of industrial applications.

Buttweld Swivel Flanges (SAI/SAIC/HAI/HAIC): Similar to their ISO 6162 counterparts, these flanges are used for larger diameter pipes. The swivel feature aids in the alignment of bolt holes, and the buttweld connection provides a strong and durable joint. These flanges are ideal for heavy-duty applications requiring frequent maintenance.

Buttweld Solid Flanges (SBI/SBIC/HBI/HBIC): These flanges are designed for use with larger diameter pipes and are connected by welding the flange to the pipe. The solid construction provides excellent strength and durability, making them suitable for high-pressure and high-temperature environments.

Blind Flanges (SSB/SHB): Used to seal off the ends of piping systems, these blind flanges are essential for maintenance and isolation of system sections. They are designed to handle high-pressure applications and provide a secure seal, preventing any leakage.

Understanding the different types of flanges and their specific applications is crucial for maintaining the integrity and efficiency of piping systems. Each type of flange, from split and monoblock forged to buttweld and socket weld, serves a unique purpose and is selected based on the requirements of the system. By choosing the appropriate flange for your application, you can ensure a reliable and long-lasting connection in your piping network.

Leave a Comment

Your email address will not be published. Required fields are marked *