What is GI Flanges?


Galvanized Iron (GI) flanges are circular components used to connect pipes or valves in a piping system. They are made from mild steel that has been coated with zinc to provide enhanced corrosion resistance. This zinc coating protects the underlying steel from rust and other forms of corrosion, making GI flanges ideal for applications in environments exposed to moisture, humidity, or corrosive substances.

Types of GI Flanges

There are various types of GI flanges available, each designed for specific applications and connection methods:

Slip-on Flanges: These flanges have a slightly larger bore diameter than the pipe and are slipped onto the pipe end before being welded.

Weld Neck Flanges: These flanges have a tapered neck that is welded to the pipe end, providing a strong and reliable connection.

Socket Weld Flanges: These flanges have a socket that fits over the end of the pipe, and the pipe is then welded into the socket.

Blind Flanges: These flanges are solid discs without a bore, used to cap off a pipe or valve.

Lap Joint Flanges: These flanges have a raised face on one side and a recessed face on the other, connected using a gasket and bolts.

Orifice Flanges: These flanges have a specific bore size and shape to accommodate an orifice plate, used to measure fluid flow rates.

Applications of GI Flanges

GI flanges are widely used in various industries due to their superior corrosion resistance:

Marine Applications: Shipbuilding, offshore platforms, and marine equipment

Chemical Processing: Handling corrosive chemicals and substances

Water Treatment: Connecting pipes and valves in water treatment facilities

Construction: Building infrastructure and piping systems

Agriculture: Irrigation systems and agricultural equipment

Benefits of Using GI Flanges

Enhanced Corrosion Resistance: The zinc coating provides excellent protection against rust and corrosion, extending the lifespan of the flanges.

Versatility: GI flanges can be used in a wide range of applications, both indoors and outdoors.

Durability: The zinc coating enhances the durability and strength of the flanges.

Low Maintenance: GI flanges generally require less maintenance compared to uncoated steel flanges.

Environmental Friendliness: The zinc coating can help prevent the release of harmful substances into the environment.

Choosing the Right GI Flange

When selecting GI flanges, consider the following factors:

Pipe Size: Ensure the flange is compatible with the pipe size you are using.

Pressure Rating: Choose a flange with a pressure rating that meets the requirements of your application.

Temperature Rating: Select a flange that can withstand the operating temperature of your system.

Flange Face: Consider the type of flange face (raised face, flat face, etc.) required for your application.

Gasket Type: Choose a gasket that is compatible with the flange face and the fluid being handled.