Raised Face Flanges

Raised Face Flanges – Uses, Dimensions, and Types

ByHeer Vohera

You might have heard about raised face flanges, but understanding their importance is essential. This guide aims to provide a thorough understanding of raised face flanges, including their applications, various types available, and the benefits they bring to welding processes.

What is Raised Face Flanges?

Raised face flanges are pipe fittings with a raised surface around the borehole. This raised portion helps centre and seal the gasket between mating flanges, enhancing sealing capabilities. Raised face flanges are commonly used in applications requiring a secure and tight seal, such as in high-pressure or high-temperature environments. They come in various sizes and materials to suit different piping needs, contributing to the reliability and efficiency of piping systems by ensuring effective sealing and alignment.

Raised Face Flanges Uses

Raised face flanges typically come with one or more raised faces, which form a seal when two flanges are bolted together. This flange type is commonly used in piping systems and various industrial applications where liquids or gases must be contained within a secure system. For example, raised face flanges can be used as joints in pipelines that contain hazardous materials, such as oil and gas. Additionally, they can also be used for connecting pipes and valves to create a secure seal between two components.

Raised Face Flanges Welding

When welding raised face flanges together, it’s essential to use a high-quality filler metal that is well-suited for the application at hand. Depending on the materials being welded together, this could mean using an austenitic stainless steel filler metal or a nickel-based alloy. Additionally, it’s also essential to ensure that all surfaces are clean before welding begins. Any dirt or debris should be removed before welding to provide the highest quality welds possible.

Raised Face Flange Types

Raised face flange come in several different sizes and shapes depending on the specific application for which it is intended. Common types include flat-faced, ring joint, slip-on, lap joint, socket welded and threaded varieties. Each type has its own unique properties that make them better suited for certain applications than others; therefore, it’s essential to research each type carefully before deciding on one for your project.

Raised Face Flange Dimensions

Raised Face Flange Dimensions

ANSI

 NOMINAL OUTSIDE OUTSIDE THICKNESS DIAMETER DIAMETER NUMBER DIAMETER
DIAMETER DIAMETER OF OF FLANGE OF BOLT OF BOLT
CLASS PIPE SIZE OF BOLTS OF BOLTS
OF FLANGE RAISED FACE tf CIRCLE HOLES
3/4 3.88 1.69 0.44 2.75 0.62 4 0.50
1 4.25 2.00 0.50 3.12 0.62 4 0.50
1 1/2 5.00 2.88 0.62 3.88 0.62 4 0.50
2 6.00 3.62 0.69 4.75 0.75 4 0.62
3 7.50 5.00 0.88 6.00 0.75 4 0.62
4 9.99 6.19 0.88 7.50 0.75 8 0.62
150 6 11.00 8.50 0.94 9.50 0.88 8 0.75
8 13.50 10.62 1.06 11.75 0.88 8 0.75
10 16.00 12.75 1.12 14.25 1.00 12 0.87
12 19.00 15.00 1.19 17.00 1.00 12 0.87
14 21.00 16.25 1.31 18.75 1.12 12 1.00
16 23.50 18.50 1.38 21.25 1.12 16 1.00
18 25.00 21.00 1.50 22.75 1.25 16 1.12
20 27.50 23.99 1.62 25.00 1.25 20 1.12
24 32.00 27.25 1.82 29.50 1.38 20 1.25
3/4 4.62 1.69 0.56 3.25 0.75 4 0.62
1 4.88 2.00 0.62 3.50 0.75 4 0.62
1 1/2 6.12 2.88 0.75 4.25 0.88 4 0.75
2 6.50 3.62 0.81 5.00 0.75 8 0.62
3 8.25 5.00 1.06 6.62 0.88 8 0.75
4 10.00 6.19 1.19 7.88 0.88 8 0.75
300 6 12.50 8.50 1.38 10.62 0.88 12 0.75
8 15.00 10.62 1.56 13.00 1.00 12 0.87
10 17.50 12.75 1.82 15.25 1.12 16 1.00
12 20.50 15.00 1.94 17.75 1.25 16 1.12
14 23.00 16.25 2.06 20.25 1.25 20 1.12
16 25.50 18.50 2.19 22.50 1.38 20 1.25
18 28.00 21.00 2.31 24.75 1.38 24 1.25
20 30.50 23.00 2.44 27.00 1.38 24 1.25
1 4.88 2.00 0.69 3.50 0.75 4 0.62
1 1/2 6.12 2.88 0.88 4.50 0.88 4 0.75
2 6.50 3.62 1.00 5.00 0.75 8 0.62
3 8.25 5.00 1.25 6.62 0.88 8 0.75
4 10.75 6.19 1.50 8.50 1.00 8 0.87
600 6 14.00 8.50 1.88 11.50 1.12 12 1.00
8 16.50 10.62 2.19 13.75 1.25 12 1.12
10 20.00 12.75 2.50 17.00 1.38 16 1.25
12 22.00 15.00 2.62 19.25 1.38 20 1.25
14 23.75 16.25 2.75 20.75 1.50 20 1.37
16 27.00 18.50 3.00 23.75 1.62 20 1.50
1 1/2 7.00 2.88 1.25 4.88 1.12 4 1.00
2 8.50 3.62 1.50 6.50 1.00 8 0.87
3 9.50 5.00 1.50 7.50 1.00 8 0.87
900 4 11.50 6.19 1.75 9.25 1.25 8 1.12
6 15.00 8.50 2.19 12.50 1.25 12 1.12
8 18.50 10.62 2.50 15.50 1.50 12 1.37
10 21.50 12.75 2.75 18.50 1.50 16 1.37
1 1/2 7.00 2.88 1.25 4.88 1.12 4 1.00
2 8.50 3.62 1.50 6.50 1.00 8 0.87
1500 3 10.50 5.00 1.88 8.00 1.25 8 1.12
4 12.25 6.19 2.12 9.50 1.38 8 1.25
6 15.50 8.50 3.25 12.50 1.50 12 1.37
8 19.00 10.62 3.62 15.50 1.75 12 1.62

Conclusion:

Raised face flanges offer numerous advantages over other types of pipe connections due to their capability to securely join two components together via bolting or welding methods while still providing an effective seal against liquids or gases travelling through the connection point. Additionally, several different types are available depending on the specific application requirements—from flat-faced varieties perfect for low-pressure applications to ring joint varieties suitable for use with higher-pressure systems. With such versatility and ease of use, no doubt raised face flanges will continue to remain popular among welders everywhere!

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