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Blind Flange – Uses, Dimensions and Types

Blind Flanges

Blind flanges are essential components widely used across industries for sealing pipes and joining metal pieces. They serve to close openings in piping systems, ensuring tight seals to prevent fluid or gas leakage. Additionally, blind flanges find application in welding operations, acting as endpoints or temporary seals during fabrication. Available in different materials and pressure ratings, they offer versatility to suit diverse project needs. Let’s take a look at the different uses of blind flanges, how they’re welded, and the types available.

What is Blind Flange?

Blind flanges are special flanges that don’t have a hole in the middle. They’re mainly used to block or stop unwanted flow in pipes. You can replace other types of flanges like welded neck or slip-on ones with blind flanges because they work just as well in keeping the system intact and containing pressure. People use blind flanges when they need to stop a pipeline for checking, or when they’re building or fixing pipelines. Besides being used in pipes, blind flanges also have other uses like sealing valves, near vessels, and turbines.

Blind Flanges Uses

Blind flanges are essential sealing components in piping systems or machinery without threaded connections. They are particularly useful when standard threaded fittings are impractical due to size limitations or inaccessible areas. Their versatility allows for convenient replacement of damaged parts without necessitating the replacement of the entire unit. Moreover, blind flanges have applications as covers or plugs for valves, pumps, and equipment requiring temporary sealing during maintenance or repair work.

Blind Flange Welding

Blind flange welding involves joining two piping sections without an opening and selecting the appropriate welding method, such as arc welding or MIG welding. Before welding, thoroughly cleaning the surfaces is essential to ensure proper adhesion. Following safety protocols, each section is meticulously welded according to the manufacturer’s specifications. Maintaining neat and precise welds is critical to prevent potential leaks when pressure is applied later on.

Blind Flange Types

Blind flanges come in a variety of sizes and materials depending on their intended use case—there are stainless steel blind flanges, plastic blind flanges, carbon steel blind flanges, etc.—which makes them suitable for almost any situation you might encounter when dealing with pipes or other components that require sealing off during maintenance operations. Additionally, there are also special types, such as high-pressure blind flange, which is designed specifically for applications involving higher-than-normal levels of pressure or vacuum conditions; these types typically feature thicker walls than regular models in order to handle extreme conditions more effectively.

Blind Flange Dimension

Blind Flanges Dimensions 

FLANGE
NPS
Outside
Diameter
Bolt Circle (BC) Raised Face (R) Raised Face (RF) Raised Face
Thickness (T)
Flat Face
Thickness (T2)
Bolt Hole (B) No. of
Bolt Holes
1/2″ 3.50″ 2.38″ 1.38″ .063″ .44″ .38″ .62″ 4
3/4″ 3.88″ 2.75″ 1.69″ .063″ .50″ .44″ .62″ 4
1″ 4.25″ 3.12″ 2.00″ .063″ .56″ .50″ .62″ 4
1-1/4″ 4.62″ 3.50″ 2.50″ .063″ .62″ .56″ .62″ 4
1-1/2″ 5.00″ 3.88″ 2.88″ .063″ .68″ .62″ .62″ 4
2″ 6.00″ 4.75″ 3.62″ .063″ .75″ .69″ .75″ 4
2-1/2″ 7.00″ 5.50″ 4.12″ .063″ .88″ .82″ .75″ 4
3″ 7.50″ 6.00″ 5.00″ .063″ .94″ .88″ .75″ 4
3-1/2″ 8.50″ 7.00″ 5.50″ .063″ .94″ .88″ .75″ 8
4″ 9.00″ 7.50″ 6.19″ .063″ .94″ .88″ .75″ 8
5″ 10.00″ 8.50″ 7.31″ .063″ .94″ .88″ .88″ 8
6″ 11.00″ 9.50″ 8.50″ .063″ 1.00″ .94″ .88″ 8
8″ 13.50″ 11.75″ 10.62″ .063″ 1.12″ 1.06″ .88″ 8
10″ 16.00″ 14.25″ 12.75″ .063″ 1.19″ 1.13″ 1.00″ 12
12″ 19.00″ 17.00″ 15.00″ .063″ 1.25″ 1.19″ 1.00″ 12
14″ 21.00″ 18.75″ 16.25″ .063″ 1.38″ 1.32″ 1.12″ 12
16″ 23.50″ 21.25″ 18.50″ .063″ 1.44″ 1.38″ 1.12″ 16
18″ 25.00″ 22.75″ 21.00″ .063″ 1.56″ 1.50″ 1.25″ 16
20″ 27.50″ 25.00″ 23.00″ .063″ 1.69″ 1.63″ 1.25″ 20
22″ 29.50″ 27.25″ 25.25″ .063″ 1.81″ 1.75″ 1.38″ 20
24″ 32.00″ 29.50″ 27.25″ .063″ 1.88″ 1.82″ 1.38″ 20

Conclusion

Blind Flanges play an essential role in many industries due to their versatility and ability to handle various applications with ease. If you’re looking for an effective way to seal off pipes without having access to traditional threaded fittings or if you need a reliable way to join two pieces together without breaking your budget, then look no further than blind flange! It’s important, however, that you know exactly what type will suit your needs – whether that be a stainless steel model capable of handling high levels of pressure/vacuum – so make sure to do your research before committing to purchase! With the right knowledge hand, you’ll soon find yourself equipped with the perfect tools to complete the tasks quickly and efficiently!

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