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BL Flange
SDFL
The EN 1092-1 05B DN20 PN25 SS blank flange provides secure high-pressure sealing in corrosive environments, leveraging a Type 05B blank face design and PN25 (2.5 MPa) rating to isolate pipelines in chemical, petrochemical, and marine sectors. Constructed from F316 stainless steel, it offers superior resistance to chloride-induced corrosion—critical for systems handling seawater, brines, or aggressive process fluids.
Parameter | Details |
Standard | EN 1092-1 Type 05B (Blind Flange) |
Material | Stainless steel F316 (1.4401, 16Cr-10Ni-2Mo, 210 HV hardness) |
Pressure Rating | PN25 (2.5 MPa, tested for 10,000 pressure cycles) |
Dimensions | OD: 105mm, Bolt Circle: 75mm, Thickness: 18mm, Hub Diameter: 57mm |
Bolt Holes | 4x M16 (pitch circle diameter 75mm, M16x2.0 thread) |
Seal Type | Flat Face (FF, Ra ≤ 3.2μm, compatible with full-face gaskets) |
Temperature Range | -20°C to 600°C (resistant to thermal shock from -196°C to 600°C) |
High-Pressure Performance: Engineered for leak-free operation at 2.5 MPa, validated by EN 1092-1 hydrostatic testing (3.75 MPa for 30 minutes) and pneumatic testing (1.5 MPa air).
Chloride Pitting Resistance: F316’s molybdenum content resists pitting in seawater and brines (19,000–35,000 ppm chloride), with a critical pitting temperature (CPT) of 40°C—higher than F304’s 10°C.
Vibration-Resistant 05B Design: A 18mm thick profile and reinforced edges reduce bending stress by 30% in high-vibration environments (e.g., near pumps or compressors).
European Safety Compliance: Compliant with PED 2014/68/EU (Module B+D) and EN 1090-2 (execution class 2), ensuring structural integrity in safety-critical systems.
Marine Engineering: Seals shipboard ballast water tanks, withstanding continuous saltwater immersion (35,000 ppm chloride) and preventing biofouling with optional copper-nickel plating.
Pharmaceuticals: Isolates sterile process lines during equipment maintenance, meeting USP Class VI biocompatibility standards (no cytotoxicity or pyrogenicity).
Power Generation: Used in boiler blowdown lines, where F316 withstands 600°C steam temperatures and resists corrosion from oxygenated feedwater (8–10 ppb O₂).
Q: Can this flange be painted for additional protection?
A: Yes. Apply epoxy coatings (ISO 12944-5, 120μm thickness) for atmospheric corrosion resistance in coastal or industrial outdoor installations, extending service life by 5+ years.
Q: What bolt torque is required?
A: Torque M16 A4-80 stainless steel bolts to 120–150 N·m using a torque wrench, following a diagonal sequence to ensure uniform gasket compression.
Q: How to handle flange misalignment?
A: Use EN 1092-1 Annex B alignment pins (M16 x 50mm) during installation to correct up to ±1.0mm axial misalignment, preventing gasket damage and leaks.
The EN 1092-1 05B DN20 PN25 SS blank flange provides secure high-pressure sealing in corrosive environments, leveraging a Type 05B blank face design and PN25 (2.5 MPa) rating to isolate pipelines in chemical, petrochemical, and marine sectors. Constructed from F316 stainless steel, it offers superior resistance to chloride-induced corrosion—critical for systems handling seawater, brines, or aggressive process fluids.
Parameter | Details |
Standard | EN 1092-1 Type 05B (Blind Flange) |
Material | Stainless steel F316 (1.4401, 16Cr-10Ni-2Mo, 210 HV hardness) |
Pressure Rating | PN25 (2.5 MPa, tested for 10,000 pressure cycles) |
Dimensions | OD: 105mm, Bolt Circle: 75mm, Thickness: 18mm, Hub Diameter: 57mm |
Bolt Holes | 4x M16 (pitch circle diameter 75mm, M16x2.0 thread) |
Seal Type | Flat Face (FF, Ra ≤ 3.2μm, compatible with full-face gaskets) |
Temperature Range | -20°C to 600°C (resistant to thermal shock from -196°C to 600°C) |
High-Pressure Performance: Engineered for leak-free operation at 2.5 MPa, validated by EN 1092-1 hydrostatic testing (3.75 MPa for 30 minutes) and pneumatic testing (1.5 MPa air).
Chloride Pitting Resistance: F316’s molybdenum content resists pitting in seawater and brines (19,000–35,000 ppm chloride), with a critical pitting temperature (CPT) of 40°C—higher than F304’s 10°C.
Vibration-Resistant 05B Design: A 18mm thick profile and reinforced edges reduce bending stress by 30% in high-vibration environments (e.g., near pumps or compressors).
European Safety Compliance: Compliant with PED 2014/68/EU (Module B+D) and EN 1090-2 (execution class 2), ensuring structural integrity in safety-critical systems.
Marine Engineering: Seals shipboard ballast water tanks, withstanding continuous saltwater immersion (35,000 ppm chloride) and preventing biofouling with optional copper-nickel plating.
Pharmaceuticals: Isolates sterile process lines during equipment maintenance, meeting USP Class VI biocompatibility standards (no cytotoxicity or pyrogenicity).
Power Generation: Used in boiler blowdown lines, where F316 withstands 600°C steam temperatures and resists corrosion from oxygenated feedwater (8–10 ppb O₂).
Q: Can this flange be painted for additional protection?
A: Yes. Apply epoxy coatings (ISO 12944-5, 120μm thickness) for atmospheric corrosion resistance in coastal or industrial outdoor installations, extending service life by 5+ years.
Q: What bolt torque is required?
A: Torque M16 A4-80 stainless steel bolts to 120–150 N·m using a torque wrench, following a diagonal sequence to ensure uniform gasket compression.
Q: How to handle flange misalignment?
A: Use EN 1092-1 Annex B alignment pins (M16 x 50mm) during installation to correct up to ±1.0mm axial misalignment, preventing gasket damage and leaks.
