Common Flange Types And Applications

Weld Neck Flange (WN)

• Description: Features a long, tapered hub for reinforcement, welded directly to the pipe.
• Applications: High-pressure and high-temperature environments, such as oil and gas pipelines and chemical processing plants.

Slip-On Flange (SO)

• Description: Slips over the pipe before welding, providing ease of alignment.
• Applications: Suitable for medium to high-pressure systems, often used in process piping.

Socket Weld Flange (SW)

• Description: Has a socket for the pipe to fit into, secured with a fillet weld.
• Applications: Used in small-diameter, high-pressure piping systems, ideal for hydraulic and gas lines.

Threaded Flange (RF)

• Description: Contains internal threads to match the pipe's external threads, eliminating the need for welding.
• Applications: Common in explosive environments and systems requiring frequent maintenance.

Blind Flange

• Description: A solid disc used to close off the end of a piping system.
• Applications: Used for pressure vessel closures and testing of piping systems.

Lap Joint Flange (LJ)

• Description: Used with a stub end, allowing for easy alignment and rotation.
• Applications: Ideal for systems requiring frequent disassembly.

Long Weld Neck Flange

• Description: Similar to weld neck but with an extended neck for bolt-up connections.
• Applications: Used in pressure vessels and heat exchangers.

Reducing Flange

• Description: Connects pipes of different diameters.
• Applications: Used in flow control systems and pump connections.

Orifice Flange

• Description: Used with orifice meters for flow measurement.
• Applications: Common in metering systems in process industries.

Ring-Type Joint Flange (RTJ)

• Description: Features a groove for a metal ring gasket, ensuring a leak-proof connection.
• Applications: Used in high-pressure and high-temperature environments, particularly in oil and gas pipelines.