What are common types of Flanges?

 

What are common types of Flanges?

Here are the common types of flanges,
explained simply and clearly:

1. Weld Neck Flange (WN)
Description:
Has a long tapered neck that is welded to the pipe.
Use:
High-pressure, high-temperature systems.
Advantage: 

Very strong; reduces stress at the base of the flange.
Common Industries:
Oil & gas, power plants, petrochemical.

2. Slip-On Flange (SO)
Description:
Slips over the pipe, then welded on the inside and outside.
Use:
Low-pressure applications where welding is easier.
Advantage:
Easy to align and install.
Limitation:
Less strength than weld neck flanges.

3. Blind Flange (BL)
Description:
A solid plate (no hole in the middle) that closes the end of a pipe.
Use: Sealing off pipe ends, valves, or pressure vessel openings.
Advantage:
Allows easy access to the pipe for maintenance or pressure testing.

4. Socket Weld Flange (SW)
Description:
The pipe is inserted into a socket and then fillet welded around the joint.
Use:
Small-diameter, high-pressure pipelines.
Advantage:
Smooth bore for better flow; good for smaller pipe systems.

5. Threaded Flange (TH)
Description:
Has internal threads; screws onto a pipe without welding.
Use:
Low-pressure, non-critical applications.
Advantage:
Easy installation; no welding required.
Limitation:
Not good for high-temperature or high-pressure.

6. Lap Joint Flange (LJ)
Description:
Works with a stub end; the flange is loose and not welded to the pipe.
Use:
Systems that require frequent disassembly.
Advantage:
Easy alignment and rotation; cost-effective for special materials.

7. Long Weld Neck Flange (LWN)
Description:
Similar to weld neck but with a longer neck.
Use:
Pressure vessels and high-pressure systems.
Advantage:
Acts like an extension of the pipe or vessel nozzle.

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