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SO Flange
SDFL
Designed as a cornerstone of high-integrity pipeline systems, this EN 1092-1 DN20 PN10 carbon steel necked welding flange merges robust structural performance with streamlined installation. Its weld-neck design (Type 11 per EN 1092-1) creates a continuous connection between the flange and pipe, eliminating weak points in high-pressure lines. Crafted from carbon steel S235JR (1.0037)—a material renowned for its balance of strength and affordability—it becomes an ideal choice for industrial environments where corrosion risks are minimal, such as water distribution, steam transport, and general mechanical systems.
Parameter | Details |
Standard | EN 1092-1 Type 11 (Weld Neck) |
Material | Carbon steel S235JR (1.0037, 235 MPa minimum yield strength) |
Pressure Rating | PN10 (1.0 MPa, suitable for low to medium pressure systems) |
Dimensions | OD: 105mm, Bolt Circle: 75mm, Thickness: 14mm, Neck Length: 30mm |
Bolt Holes | 4x M12 (pitch circle diameter 75mm, ±0.5mm positional tolerance) |
Seal Type | Raised Face (RF, 1.6mm height, Ra 12.5 surface finish) |
Temperature Range | -20°C to 300°C (ideal for saturated steam and hot water systems) |
Weld-Neck Reinforcement: The extended neck section distributes stress evenly across the weld joint, enhancing load-bearing capacity by 30% compared to slip-on flanges. This design minimizes stress concentration—critical for pipelines with cyclic pressure fluctuations (e.g., 0–1.0 MPa operating cycles).
Precision Machining: Adhering to EN 1092-1 standards, the flange boasts ±1.6mm outer diameter tolerance and ±0.5mm bolt hole alignment, ensuring uniform gasket compression and reducing leak risks by 40% in field tests.
Cost-Effective Carbon Steel: S235JR material delivers a 235 MPa yield strength at a fraction of alloy steel costs, making it perfect for non-corrosive applications like potable water lines and low-pressure steam systems.
Easy Welding Compatibility: Designed for full penetration fillet welds (per EN 1011-2), it forms metallurgical bonds with carbon steel pipes, eliminating crevices where corrosion could initiate.
Industrial Machinery: Connects compressed air lines in automotive assembly plants, withstanding pulsating pressures from reciprocating compressors (0.8–1.0 MPa).
HVAC Systems: Serves condensate drainage lines in commercial building heating systems, where S235JR resists thermal expansion stresses from -20°C (winter shutdowns) to 150°C (peak operation).
General Construction: Buried in municipal water distribution networks, with optional zinc plating (ISO 1461, 85μm minimum thickness) to resist soil moisture corrosion for 10+ years.
Q: Can this flange be used in corrosive environments?
A: For moderate exposure (e.g., humid industrial areas), hot-dip galvanized (HDG) coatings (ISO 1461, 85μm thickness) provide 5–7 years of protection. For severe conditions (e.g., coastal regions), upgrade to EN 1092-1 DN20 PN10 F304 stainless steel weld-neck flanges.
Q: What welding procedure is recommended?
A: Use GTAW (TIG) with ER70S-6 filler metal for root passes, followed by SMAW (Stick) with E4313 electrodes for fill and cap, per EN 1011-2 Annex C.
Q: What gasket material is suitable for steam applications?
A: Graphite-reinforced PTFE gaskets (EN 1514-2 Type CG) rated for 300°C+ and 1.5 MPa pressure ensure steam-tight seals in boiler feed lines.
Designed as a cornerstone of high-integrity pipeline systems, this EN 1092-1 DN20 PN10 carbon steel necked welding flange merges robust structural performance with streamlined installation. Its weld-neck design (Type 11 per EN 1092-1) creates a continuous connection between the flange and pipe, eliminating weak points in high-pressure lines. Crafted from carbon steel S235JR (1.0037)—a material renowned for its balance of strength and affordability—it becomes an ideal choice for industrial environments where corrosion risks are minimal, such as water distribution, steam transport, and general mechanical systems.
Parameter | Details |
Standard | EN 1092-1 Type 11 (Weld Neck) |
Material | Carbon steel S235JR (1.0037, 235 MPa minimum yield strength) |
Pressure Rating | PN10 (1.0 MPa, suitable for low to medium pressure systems) |
Dimensions | OD: 105mm, Bolt Circle: 75mm, Thickness: 14mm, Neck Length: 30mm |
Bolt Holes | 4x M12 (pitch circle diameter 75mm, ±0.5mm positional tolerance) |
Seal Type | Raised Face (RF, 1.6mm height, Ra 12.5 surface finish) |
Temperature Range | -20°C to 300°C (ideal for saturated steam and hot water systems) |
Weld-Neck Reinforcement: The extended neck section distributes stress evenly across the weld joint, enhancing load-bearing capacity by 30% compared to slip-on flanges. This design minimizes stress concentration—critical for pipelines with cyclic pressure fluctuations (e.g., 0–1.0 MPa operating cycles).
Precision Machining: Adhering to EN 1092-1 standards, the flange boasts ±1.6mm outer diameter tolerance and ±0.5mm bolt hole alignment, ensuring uniform gasket compression and reducing leak risks by 40% in field tests.
Cost-Effective Carbon Steel: S235JR material delivers a 235 MPa yield strength at a fraction of alloy steel costs, making it perfect for non-corrosive applications like potable water lines and low-pressure steam systems.
Easy Welding Compatibility: Designed for full penetration fillet welds (per EN 1011-2), it forms metallurgical bonds with carbon steel pipes, eliminating crevices where corrosion could initiate.
Industrial Machinery: Connects compressed air lines in automotive assembly plants, withstanding pulsating pressures from reciprocating compressors (0.8–1.0 MPa).
HVAC Systems: Serves condensate drainage lines in commercial building heating systems, where S235JR resists thermal expansion stresses from -20°C (winter shutdowns) to 150°C (peak operation).
General Construction: Buried in municipal water distribution networks, with optional zinc plating (ISO 1461, 85μm minimum thickness) to resist soil moisture corrosion for 10+ years.
Q: Can this flange be used in corrosive environments?
A: For moderate exposure (e.g., humid industrial areas), hot-dip galvanized (HDG) coatings (ISO 1461, 85μm thickness) provide 5–7 years of protection. For severe conditions (e.g., coastal regions), upgrade to EN 1092-1 DN20 PN10 F304 stainless steel weld-neck flanges.
Q: What welding procedure is recommended?
A: Use GTAW (TIG) with ER70S-6 filler metal for root passes, followed by SMAW (Stick) with E4313 electrodes for fill and cap, per EN 1011-2 Annex C.
Q: What gasket material is suitable for steam applications?
A: Graphite-reinforced PTFE gaskets (EN 1514-2 Type CG) rated for 300°C+ and 1.5 MPa pressure ensure steam-tight seals in boiler feed lines.
