Flange

Huaxi Special Steel Manufacturing Co., Ltd
Flange

Flange

Flange is a mechanical part used to connect pipes, valves, equipment or other components. It is usually disc-shaped with bolt holes and is sealed or fixed by bolts.

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Size Range

Size: 1/2”-60” (DN15-DN3000)
Wall thickness: Schedule 10(S) to SCH 16


Types

Types by connection method:
Slip-on FlangeWeld Neck Flange
Socket Weld Flange
Slip On Flange
Threaded Flange
Lap Joint Flange
Blind Flange

Types by sealing surface:
Flat Face (FF)
Raised Face (RF)
Ring Joint Face (RTJ)



Pipe flange connection types refer to the different methods used to join pipes, valves, and other equipment through the use of flanges. These connection methods play a critical role in ensuring a secure and leak-tight joint in various industrial applications. Here are some common pipe flange connection types:

Weld Neck Flange

This type of flange has a long tapered hub that gradually merges with the pipe, allowing for a smooth transition of stress from the flange to the pipe. Weld neck flanges are ideal for high-pressure and high-temperature applications, as they provide excellent structural integrity and reduce the risk of leakage.

Socket Weld Flange

Socket weld flanges are designed to be welded directly to the pipe. They have a socket-like recess on the inside to insert the pipe end. These flanges are suitable for smaller pipe sizes and systems with high pressure or temperature conditions.

Slip On Flange

Slip-on flanges have a slightly larger diameter than the pipe, and they are slid over the pipe before welding. They are easier to align and install, making them popular for applications with lower pressure and temperature requirements.

Threaded Flange

Threaded flanges have internal threads that allow them to be screwed onto the pipe. These are used for smaller pipe sizes and are often employed in low-pressure systems where welding is not feasible or necessary.

Lap Joint Flange

Lap joint flanges consist of two parts – the stub end and the backing flange. The stub end is welded to the pipe, while the backing flange is used to bolt the joint together. This type of flange is used in systems that require frequent dismantling.

Blind Flange

Blind flanges are used to close the end of a piping system. They do not have a center bore and are typically used for maintenance, inspection, or to block off a section of piping.



Standard & Grade

Carbon steel:
A105: Forgings, used for high-pressure and normal-temperature pipelines.
A350 LF2: Low-temperature forged steel (below -46°C).

Stainless steel:
A182 F304/F316: Austenitic stainless steel (corrosion resistant).

Alloy steel:
A182 F11/F22: Chromium-molybdenum steel (resistant to high temperature and high pressure, such as power station boilers).

Process

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