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What is Flat Flange? Types, Dimension and Uses

February 6, 2023February 6, 2023 | 5:16 pm
Flat Flange

In this blog, we will discuss what a flat flange is, the different types of flat flanges available on the market, and how they can be used in many applications. With this information, you should know to make an informed decision when purchasing a flat flange for your next project.

What is Flat Flange?

A flat flange is a mechanical fitting typically used as part of a piping system. It consists of two components – the body and the gasket. The body connects two pieces of pipe and provides support for them while the gasket seals off any openings between them. This ensures that no air or other gases escape from the pipes, which would otherwise create an unsafe situation.

Flat Flanges Types

Flat flanges are available in various types to suit different needs. Slip-on flanges, for instance, easily slide over the pipe and are then secured with welding or bolting. Weld neck flanges are notable for their elongated neck, which provides enhanced support and distributes stress more effectively. Socket weld flanges are equipped with a socket for straightforward insertion of the pipe, while blind flanges are specifically designed to seal the end of a piping system. Each type serves distinct purposes across a range of industrial applications.

Flat Flanges Uses

Flat flanges can be used in many applications, from residential plumbing systems to industrial chemical processing plants. Residential plumbing systems are often used as part of water lines or gas lines since their tight seal ensures no air leaks into the home environment. Industrial chemical processing plants are often used in conjunction with valves and pumps for safely and efficiently controlling pressurized liquids or gases safely and efficiently. They can also be found in power plant environments where their ability to handle high temperatures helps ensure that processes run smoothly without interruption due to overheating or excessive pressure build-up.

Flat Flange Dimension

NPS Diameter of Pipe Flange I.Diameter NUmber of holes Flange Diameter Thickness of Flange Diameter of Bolt Circle Diameter of Bolt Holes Approx. Weight
DN ISO DIN D5 BN D b K d2 KG/PCS
10 – 14 14.5 4 90 16 60 14 0.7
17.2 – 17.7 4 90 16 60 14 0.69
15 – 20 21 4 95 16 65 14 0.77
21.3 – 22 4 95 16 65 14 0.77
20 – 25 26 4 105 18 75 14 1.06
26.9 – 27.6 4 105 18 75 14 1.05
25 – 30 31 4 115 18 85 14 1.27
33.7 – 34.4 4 115 18 85 14 1.25
32 – 38 39 4 140 18 100 18 1.86
42.4 – 43.1 4 140 18 100 18 1.83
40 – 44.5 45.5 4 150 18 110 18 2.12
48.3 – 49 4 150 18 110 18 2.09
50 – 57 58.1 4 165 20 125 18 2.78
60.3 – 61.1 4 165 20 125 18 2.74
65 76.1 – 77.1 8 185 22 145 18 3.48
80 88.9 – 90.3 8 200 24 160 18 4.33
100 – 108 109.6 8 235 24 190 22 5.82
114.3 – 115.9 8 235 24 190 22 5.61
125 – 133 134.8 8 270 26 220 26 7.91
139.7 – 141.6 8 270 26 220 26 7.6
150 – 159 161.1 8 300 28 250 26 10.12
168.3 – 170.5 8 300 28 250 26 9.58
175 193.7 – 196.1 12 350 32 295 30 14.45
200 219.1 – 221.8 12 375 34 320 30 16.9
250 – 267 270.2 12 450 38 385 33 27.28
273 – 276.2 12 450 38 385 33 26.51
300 323.9 – 327.6 16 515 42 450 33 36.38
350 355.6 – 359.7 16 580 46 510 36 52.83
– 368 372.2 16 580 46 510 36 50.24
400 406.4 – 411 16 660 50 585 39 74.71
– 419 423.7 16 660 50 585 39 71.44
500 508 – 513.6 20 755 52 670 42 86.87
600 610 – 616.5 20 890 54 795 48 121.84
700 711 – 716 24 995 58 900 48 150.93
800 813 – 818 24 1140 64 1030 56 219.08
900 914 – 920 28 1250 70 1140 56 271.16
1000 1016 – 1022 28 1360 78 1250 56 344.95

Conclusion:

Flat flanges offer an efficient way to connect multiple parts securely while still allowing for easy disassembly when necessary. They come in various sizes and styles, so you can find one that best fits your needs depending on what type of application you’re using it for. Whether you need one for residential plumbing or industrial chemical processing, knowing more about flat flanges and how they work will help ensure that your project runs smoothly without any unexpected problems arising due to improper installation or maintenance procedures. Thanks for reading!

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