Socket Weld Flanges
Stellanox Steel supplies high-performance Socket Weld Flanges manufactured for high-pressure, small bore piping systems that demand a compact, strong, and leak-proof joint. These flanges are commonly fabricated from Stainless Steel, Carbon Steel, Alloy Steel, Inconel, Monel, Hastelloy, Nickel Alloys, and Titanium, and are widely used in hydraulic lines, steam systems, oil & gas networks, chemical process units, and marine platforms.
All socket weld flanges are available in Raised Face (RF) and Flat Face (FF) configurations, and conform to ASME B16.5, ASME B16.47, EN, ISO, and DIN standards.
What are Socket Weld Flanges?
Socket Weld Flanges (SW Flanges) are designed with a recessed socket into which the pipe is inserted and fillet welded. This design delivers a smooth bore and better flow characteristics, making socket weld flanges ideal for high-pressure, non-corrosive fluid pipelines.
They are especially effective for piping systems ≤ 2” (50mm) in diameter, where butt welding becomes challenging. The strong inner support provided by the socket helps the joint resist fatigue, making it suitable for repetitive pressure or thermal cycles.
| Products |
|---|
|
Stainless Steel |
|
Carbon Steel |
|
Duplex Stainless Steel |
|
Super Duplex Stainless Steel |
|
Alloy Steel |
|
Titanium |
|
Hastelloy |
|
Inconel |
|
Monel |
|
Aluminium |
|
Copper |
|
Pure Nickel |
|
Flanges |
|
Forged Fittings |
|
Valves |
|
Fasteners |
Key Features
Leak-Proof Connection with Inner Pipe Support
Compact Design for Small Bore, High-Pressure Systems
Smooth Bore Ensures Minimal Turbulence or Pressure Drop
Less Welding Than Butt Weld = Lower Fabrication Time
Available in RF and FF Faces
ASME, DIN, EN, BS, ISO Certified
Specification
| Property | Details |
|---|---|
| Sizes Available | ½” NB to 2” NB (DN15 – DN50) |
| Pressure Ratings | Class 150, 300, 600, 900, 1500, 2500 |
| Face Types | RF (Raised Face), FF (Flat Face) |
| Weld Type | Fillet Weld at Pipe & Flange Interface |
| Materials | SS 304/316, CS A105, Alloy F11/F22, Monel, Inconel, Hastelloy |
| Standards | ASME B16.5, B16.47, EN 1092-1, DIN 2565, ISO 7005-1 |
| Certifications | EN 10204 3.1/3.2, NACE MR0175, PED, ISO, CE, IBR |
Materials Grades
| Material | Grades |
|---|---|
| Stainless Steel | 304, 304L, 316, 316L |
| Carbon Steel | A105, A350 LF2 |
| Alloy Steel | A182 F11, F22 |
| Nickel Alloys | Inconel 600/625, Monel 400 |
| Titanium | Gr. 2, Gr. 5 |
Weight
| Size (inches) | Approx. Weight (kg) | Pressure Class | Standard |
|---|---|---|---|
| 2" | 3.10 | 300# | ANSI B16.5 |
| 4" | 6.80 | 300# | ANSI B16.5 |
| 6" | 12.30 | 300# | ANSI B16.5 |
| 8" | 20.80 | 300# | ANSI B16.5 |
| 10" | 32.10 | 300# | ANSI B16.5 |
Applications
Petrochemical Plants: High-pressure transfer lines, refinery skids
Steam & Boiler Systems: High-temperature small-bore connections
Hydraulic Systems: Leak-proof joints in power transmission lines
Marine & Offshore: Bilge systems, ballast piping, seawater applications
Water Treatment & Filtration Units: Small diameter fluid transfer
LNG & Cryogenic Plants: Compact design for low-temperature systems
Benefits
Low-Cost, Compact Design for High-Pressure Small-Bore Systems
Strong Fillet Weld Minimizes Risk of Leakage
Smooth Flow Characteristics Due to Internal Bore Alignment
Simple to Align, Tack, and Weld
Ideal for Piping Systems with Frequent Pressure/Temp Cycles
Fully Certified with Traceability & Custom Machining Options
2025 Stellanox Steel |