What is a Socket Weld Flange
A Socket Weld Flange is designed for small-bore, high-pressure piping systems. The pipe is inserted into a recessed socket area and fillet welded to the flange hub, creating a strong, leak-proof connection.
Key Features
- Socket bore matches pipe outer diameter for precise fit
- Fillet weld provides strong mechanical connection
- Internal crevice minimized for better flow characteristics
- Available in raised face (RF) or ring type joint (RTJ)
Advantages
- Excellent for high-pressure applications
- Better fatigue strength than slip-on flanges
- No beveling required for welding
- Good flow characteristics with proper gap
- Cost-effective for small diameter piping
Applications
- High-pressure steam lines (NPS 2 and below)
- Hydraulic systems
- Chemical injection lines
- Instrument tubing connections
- High-pressure process piping
Installation Guidelines
Important: Leave a 1.6mm (1/16 inch) gap between pipe end and socket bottom to allow for thermal expansion and reduce weld stress.
Standards and Specifications
- ASME B16.5: NPS 1/2 to 3, Class 150-2500
- ASME B16.11: Forged fittings, socket weld and threaded
- EN 1092-1: European standard socket weld flanges
Material Options
- Stainless Steel: 304/304L, 316/316L, 321, 347
- Carbon Steel: ASTM A105, A350 LF2
- Alloy Steel: F11, F22, F91
- Duplex Steel: 2205, 2507
Socket weld flanges are the ideal choice for small-bore, high-pressure piping systems where leak-tight integrity is critical.
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