Raised face flanges
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What is raised face flanges?
A raised face flanges is a common type of flange that can be easily identified. The Raised face flanges has a raised face that has a gasket surface raised above their bolting circle face. The flanges can be enclosed with a combination of different gaskets. A Raised face flange concentrates more pressure on the smaller gasket area. This allows it to increase its pressure containment of the joint. The Rf flange creates strong seals and is very reliable. The height of these flanges is defined by the flange pressure rating. ANSI raised face flanges is designed in pressure classes of 150# to 2500#.
Raised Face Flange dimensions, weight and specification

Check ASME b16.5 RF flanges class 150/ 600 dimensions, types, and serration
What is the difference between a smooth finish and a serration RF flange?
The raised flange face is designed with a smooth and serrated surface finish. A smooth Slip on raised face flange has a smooth surface that has no apparent tool markings visible to the naked eye. This is achieved by forming the contact surface of the gasket with a continuous spiral groove. The Serrated raised face flange has some smoothness and has some form of tool marking on the flange face. The flanges are produced with a non-metallic gasket. The serrated Raised face threaded flange can be designed in either concentric or spiral specifications.
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What is the use of a stainless steel raised face flange in the refinery & petrochemical industry?
The SS raised face flange is designed to operate in higher pressure and temperature conditions. The versatile design of the Raised face long weld neck flange allows it to create a strong sealing. The sealing is essential in petrochemical and refineries as they are subject to vigorous conditions. The Socket weld raised face flange ensures there is stability and reliability across this harsh environment.
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Which tests are required for an a350 lf2 rf flange?
The A350 lf2 raised face flanges is subject to various tests to determine its performance in the system. Generally, a Weld neck raised face flanges is Charpy notch tested, radiography, ultrasonic, impact, and mechanical tests. The flanges can also be subject to visual and material inspection before delivery to the customer.
Types of raised face flanges
Stainless steel raised face flange
Alloy steel rf flange
ASTM A105 raised face weld neck flange
Duplex steel rf ff flange
SS serrated raised face flange
ANSI raised face flange
ASTM A182 F304 blind raised face flange
Carbon steel raised face flange
Super Duplex rf flange
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How do you determine the ideal size and thickness of a raised face flange?
The ideal size and thickness of a raised face flanges are based on your requirements. Generally, a Weld neck rf flanges can be calculated by measuring its outer and internal diameters. Once you get the correct measurement check whether the dimensions of the Weld neck raised face flange to fit your piping equipment.
The flange thickness can be calculated by understanding the pressure and temperature condition of the flange in the piping system. You can check the Raised face weld neck flange thickness by checking the ASME pressure vessel design calculations and determining its ratings. Once you find the rating you can check the ASME B16.5 table to get the standard thickness.
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When do you install the carbon steel blind raised face flange in pipeline?
Installing a Raised face threaded flange properly is important to get the best performance. A Raised face blind flanges is installed at the hydraulic systems to terminate the flow of media. These flanges are inserted by bolting them efficiently at the ends of the pipeline. However, the Blind raised face flanges can also be welded using standard procedures.