Flange Types
Blind Flat Face Flange
A blind flat face flange is a solid disk-shaped flange with a flat sealing surface. It is used to seal or terminate the end of a piping system. The flat face design makes it ideal for applications with lower pressure ratings and where a smooth, even sealing surface is required.
Blind Flat Face
Flange Categories
Blind Flanges
Blind Flat Face
Blind Raised Face
Spectacle Blind
Blind Ring Joint
Weld Neck Flanges
Weld Neck Flat Face
Weld Neck Raised Face
Long Weld Neck
Socket Weld Flanges
Socket Weld Flat Face
Socket Weld Raised Face
Slip-on Weld Flanges
Slip on Weld Flat Face
Slip on Weld Raised Face
Threaded Flanges
Threaded Flat Face
Threaded Raised Face
Bossed Flanges
Bossed Flat Face
Bossed Raised Face
Orifice Flanges
Orifice Plate
Orifice Flange
Orifice Flange with Plate
Special Types
Lapped
Flange End Types
Screwed Ends
Features threaded connections for easy assembly and disassembly without welding. Commonly used in smaller diameter pipes and lower pressure applications.
Welded Ends
Provides a permanent, strong connection through welding. Preferred for high-pressure and high-temperature applications.
Lapped Ends
Features a lap joint that allows for easy rotation during assembly. Ideal for applications requiring frequent assembly and disassembly.
Flange Face Types
Ring Joint (RTJ)
Features a precision-machined groove for metallic ring gaskets. Provides superior sealing for high-pressure applications up to Class 2500. Ideal for critical services in petrochemical and offshore industries.
Flat Face (FF)
Sealing surface extends to the flange's outer edge. Designed for cast iron and plastic piping where even gasket pressure is crucial. Best suited for lower pressure applications up to Class 150.
Raised Face (RF)
Most common type with elevated sealing surface. Standard height: 1/16" (Class 150/300) and 1/4" (Class 600+). Features serrated spiral finish (3.2μm-6.3μm Ra) for improved sealing.
Large Raised Face (LRF)
Extended raised sealing area for better gasket stability. Designed for large diameter flanges (24"+). Prevents gasket blow-out in challenging applications.
Frequently Asked Questions
What is the most common type of flange?
The raised face flange is the most common type used in industrial applications. It provides excellent sealing capabilities and is suitable for most standard pressure ratings.
How do I choose the right flange type?
Consider factors such as operating pressure, temperature, media being transported, installation requirements, and industry standards when selecting a flange type.