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BL Flange
SDFL
The EN 1092-1 DN40 PN25 stainless steel BL flange delivers heavy-duty isolation for demanding industrial pipelines, combining a robust Type 05B blank face design with PN25 (2.5 MPa) pressure capability. Constructed from F316 stainless steel (1.4401)—enhanced with 2–3% molybdenum—it resists aggressive chemicals, making it a staple in chemical processing, mining, and LNG applications where corrosion and pressure risks are critical.
Parameter | Details |
Standard | EN 1092-1 Type 05B (Blind Flange) |
Material | Stainless steel F316 (1.4401, 16Cr-10Ni-2Mo, 485 MPa minimum yield strength) |
Pressure Rating | PN25 (2.5 MPa, certified for high-pressure cyclic service) |
Dimensions | OD: 150mm, Bolt Circle: 110mm, Thickness: 20mm, Hub Diameter: 76mm |
Bolt Holes | 8x M16 (pitch circle diameter 110mm, ±0.5mm positional tolerance) |
Seal Type | Flat Face (FF, Ra ≤ 3.2μm, compatible with EN 1514-2 gaskets) |
Temperature Range | -20°C to 600°C (retains ductility at cryogenic temperatures) |
Molybdenum-Enhanced Corrosion Resistance: F316’s 2–3% molybdenum content forms a protective oxide layer, resisting chloride pitting in seawater (35,000 ppm Cl⁻) and 5% sulfuric acid, with a pitting resistance equivalent (PREN) of 32.
High-Durability Construction: A 20mm thick profile and reinforced bolt circle ensure 15+ years of service in harsh conditions, withstanding vibration from pumps and compressors.
Precision Machined Sealing Surface: EN 1092-1 mandates ±1.6mm bolt hole tolerance and Ra ≤ 3.2μm finish, ensuring consistent gasket contact and reducing leak rates to <1x10⁻⁶ Pa·m³/s.
Industry-Leading Certifications: Certified to API 605 (large-diameter flanges) and ISO 9001:2015, with material traceability from melt to delivery.
Chemical Processing: Isolates reactor vessels during catalyst replacement, withstanding pH 2–12 process fluids (e.g., acetic acid, sodium hydroxide).
Mining: Seals slurry pipelines in copper leaching operations, resisting 10% sulfuric acid and abrasive mineral particles (200μm maximum size).
LNG Terminals: Used in cryogenic transfer lines, maintaining ductility at -162°C LNG temperatures and preventing brittle fracture during cold startups.
Q: What is the difference between F304 and F316?
A: F316 adds 2–3% molybdenum, increasing chloride resistance by 2–3x (PREN 32 vs. F304’s 20) and extending service life in coastal or chemical environments.
Q: Can this flange be used with metric and imperial pipes?
A: Yes. Pair with DN40 to NPS 1-1/2" reducing flanges (EN 1092-1 Type 11) to connect metric (48.3mm OD) and imperial (48.3mm OD) pipes, ensuring pressure compatibility.
Q: How to test for leaks?
A: For critical applications, perform helium mass spectrometry testing (ISO 15184), detecting leaks as low as 1x10⁻⁹ mbar·L/s—ideal for LNG and pharmaceutical systems.
The EN 1092-1 DN40 PN25 stainless steel BL flange delivers heavy-duty isolation for demanding industrial pipelines, combining a robust Type 05B blank face design with PN25 (2.5 MPa) pressure capability. Constructed from F316 stainless steel (1.4401)—enhanced with 2–3% molybdenum—it resists aggressive chemicals, making it a staple in chemical processing, mining, and LNG applications where corrosion and pressure risks are critical.
Parameter | Details |
Standard | EN 1092-1 Type 05B (Blind Flange) |
Material | Stainless steel F316 (1.4401, 16Cr-10Ni-2Mo, 485 MPa minimum yield strength) |
Pressure Rating | PN25 (2.5 MPa, certified for high-pressure cyclic service) |
Dimensions | OD: 150mm, Bolt Circle: 110mm, Thickness: 20mm, Hub Diameter: 76mm |
Bolt Holes | 8x M16 (pitch circle diameter 110mm, ±0.5mm positional tolerance) |
Seal Type | Flat Face (FF, Ra ≤ 3.2μm, compatible with EN 1514-2 gaskets) |
Temperature Range | -20°C to 600°C (retains ductility at cryogenic temperatures) |
Molybdenum-Enhanced Corrosion Resistance: F316’s 2–3% molybdenum content forms a protective oxide layer, resisting chloride pitting in seawater (35,000 ppm Cl⁻) and 5% sulfuric acid, with a pitting resistance equivalent (PREN) of 32.
High-Durability Construction: A 20mm thick profile and reinforced bolt circle ensure 15+ years of service in harsh conditions, withstanding vibration from pumps and compressors.
Precision Machined Sealing Surface: EN 1092-1 mandates ±1.6mm bolt hole tolerance and Ra ≤ 3.2μm finish, ensuring consistent gasket contact and reducing leak rates to <1x10⁻⁶ Pa·m³/s.
Industry-Leading Certifications: Certified to API 605 (large-diameter flanges) and ISO 9001:2015, with material traceability from melt to delivery.
Chemical Processing: Isolates reactor vessels during catalyst replacement, withstanding pH 2–12 process fluids (e.g., acetic acid, sodium hydroxide).
Mining: Seals slurry pipelines in copper leaching operations, resisting 10% sulfuric acid and abrasive mineral particles (200μm maximum size).
LNG Terminals: Used in cryogenic transfer lines, maintaining ductility at -162°C LNG temperatures and preventing brittle fracture during cold startups.
Q: What is the difference between F304 and F316?
A: F316 adds 2–3% molybdenum, increasing chloride resistance by 2–3x (PREN 32 vs. F304’s 20) and extending service life in coastal or chemical environments.
Q: Can this flange be used with metric and imperial pipes?
A: Yes. Pair with DN40 to NPS 1-1/2" reducing flanges (EN 1092-1 Type 11) to connect metric (48.3mm OD) and imperial (48.3mm OD) pipes, ensuring pressure compatibility.
Q: How to test for leaks?
A: For critical applications, perform helium mass spectrometry testing (ISO 15184), detecting leaks as low as 1x10⁻⁹ mbar·L/s—ideal for LNG and pharmaceutical systems.
