Flat Welded Flange with Neck
A Flat Welded Flange with Neck (also known as a ”Slip-On Flange with Hub” or ”Hubbed Slip-On Flange”) is a type of flange designed for easy welding and alignment in piping systems. It combines features of both Slip-On Flanges and Weld Neck Flanges, offering a balance between cost-effectiveness and structural strength.
Key Features
- Hub (Neck) Design
- Unlike a standard Slip-On Flange (flat-faced), this flange has a short integrated hub (neck) that provides better reinforcement and stress distribution.
- The hub allows for a smoother transition between the pipe and flange, reducing turbulence and wear.
- Welding Method
- The flange is slipped over the pipe and then welded both inside and outside (fillet weld on the hub side and butt weld on the pipe side).
- This double welding ensures a strong, leak-proof connection.
- Material & Standards
- Common materials: Carbon Steel (ASTM A105), Stainless Steel (A182 F304/F316), Alloy Steel
- Standard dimensions: ASME B16.5, EN 1092-1, DIN, JIS, etc.
Advantages
✔ Easier Alignment – The hub helps guide the pipe into place, simplifying installation.
✔ Cost-Effective – Cheaper than Weld Neck Flanges but stronger than standard Slip-On Flanges.
✔ Good for Low-Pressure Systems – Suitable for moderate pressure and temperature applications.
✔ Smooth Bore – Reduces turbulence and erosion in fluid flow.
Disadvantages
❌ Not for High-Pressure/Temperature – Less robust than Weld Neck Flanges in extreme conditions.
❌ Double Welding Required – More welding work compared to Lap Joint or Threaded Flanges.
Common Applications
- Water & wastewater systems
- Oil & gas (low-pressure pipelines)
- Chemical processing
- HVAC & industrial piping
Comparison with Other Flange Types
| Feature | Flat Welded Flange with Neck | Standard Slip-On Flange | Weld Neck Flange |
|---|---|---|---|
| Strength | Medium | Low | High |
| Cost | Moderate | Low | High |
| Welding | Inside + Outside | Inside + Outside | Butt Weld Only |
| Best For | Moderate pressure systems | Low-pressure systems | High-pressure systems |
Conclusion
The Flat Welded Flange with Neck is a versatile and economical choice for piping systems requiring better strength than a Slip-On Flange but without the high cost of a Weld Neck Flange. It is widely used in industries where moderate pressure and alignment ease are key factors.
Mila
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