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BL Flange
SDFL
This EN 1092-1 05B DN25 PN25 SS blind flange serves as a critical isolation component in high-pressure industrial systems, providing secure end-of-line sealing for pipelines operating up to 2.5 MPa. Its Type 05B blank face design eliminates dead spaces, while F304 stainless steel construction ensures resistance to corrosive media—making it indispensable in oil & gas, power, and water treatment applications where leakage risks are high.
Parameter | Details |
Standard | EN 1092-1 Type 05B (Blind Flange) |
Material | Stainless steel F304 (1.4301, 18Cr-8Ni, 200 HV hardness) |
Pressure Rating | PN25 (2.5 MPa, suitable for high-pressure isolation) |
Dimensions | OD: 115mm, Bolt Circle: 85mm, Thickness: 16mm, Hub Diameter: 57mm |
Bolt Holes | 4x M16 (pitch circle diameter 85mm, through-hole design) |
Seal Type | Flat Face (FF, Ra ≤ 3.2μm, compatible with full-face gaskets) |
Temperature Range | -20°C to 450°C (resistant to thermal cycling in steam systems) |
High-Pressure Sealing Integrity: The flat face design distributes clamping force evenly across EN 1514-2 gaskets, validated by hydrostatic testing at 3.75 MPa (1.5x rated pressure) for 30 minutes with zero leakage.
Chloride Stress Corrosion Resistance: F304’s chromium-nickel alloy resists cracking in marine or brine systems (35,000 ppm chloride), outperforming carbon steel by 5x in salt spray tests (ISO 9227).
Reinforced 05B Design: Type 05B includes a thickened center section (16mm) and radiused edges, reducing bending stress by 25% under cyclic pressure loads (0–2.5 MPa).
Multi-Certification Coverage: Compliant with ASME BPVC Section VIII (pressure vessels) and TR CU 032/2013 (EAC), enabling use in Russian and Eurasian industrial projects.
Oil & Gas: Isolates wellhead manifolds during maintenance, withstanding hydrogen sulfide (H₂S) levels up to 500 ppm in sour gas environments.
Power Plants: Seals steam turbine bypass lines, maintaining integrity at 450°C+ superheated steam and preventing energy loss in thermal cycles.
Water Treatment: Caps chlorinated water storage tanks (1–3 ppm free chlorine), with optional PTFE coating (50μm thickness) for enhanced chemical resistance.
Q: What gasket material is recommended for PN25?
A: Spiral-wound gaskets (EN 1514-4 Type CG) with 304 metal reinforcement and graphite filler, rated for 2.5 MPa and 450°C, ensure bubble-tight seals.
Q: Can this flange handle vacuum conditions?
A: Yes. For vacuum systems (-1 bar), specify Class 150 equivalent gaskets (e.g., copper-clad asbestos) and torque bolts to 150 N·m to prevent air ingress.
Q: How to verify bolt tightness?
A: Use a digital torque wrench set to 120–150 N·m for M16 A4-70 bolts, following a star pattern (tighten opposite bolts sequentially) to ensure uniform load.
This EN 1092-1 05B DN25 PN25 SS blind flange serves as a critical isolation component in high-pressure industrial systems, providing secure end-of-line sealing for pipelines operating up to 2.5 MPa. Its Type 05B blank face design eliminates dead spaces, while F304 stainless steel construction ensures resistance to corrosive media—making it indispensable in oil & gas, power, and water treatment applications where leakage risks are high.
Parameter | Details |
Standard | EN 1092-1 Type 05B (Blind Flange) |
Material | Stainless steel F304 (1.4301, 18Cr-8Ni, 200 HV hardness) |
Pressure Rating | PN25 (2.5 MPa, suitable for high-pressure isolation) |
Dimensions | OD: 115mm, Bolt Circle: 85mm, Thickness: 16mm, Hub Diameter: 57mm |
Bolt Holes | 4x M16 (pitch circle diameter 85mm, through-hole design) |
Seal Type | Flat Face (FF, Ra ≤ 3.2μm, compatible with full-face gaskets) |
Temperature Range | -20°C to 450°C (resistant to thermal cycling in steam systems) |
High-Pressure Sealing Integrity: The flat face design distributes clamping force evenly across EN 1514-2 gaskets, validated by hydrostatic testing at 3.75 MPa (1.5x rated pressure) for 30 minutes with zero leakage.
Chloride Stress Corrosion Resistance: F304’s chromium-nickel alloy resists cracking in marine or brine systems (35,000 ppm chloride), outperforming carbon steel by 5x in salt spray tests (ISO 9227).
Reinforced 05B Design: Type 05B includes a thickened center section (16mm) and radiused edges, reducing bending stress by 25% under cyclic pressure loads (0–2.5 MPa).
Multi-Certification Coverage: Compliant with ASME BPVC Section VIII (pressure vessels) and TR CU 032/2013 (EAC), enabling use in Russian and Eurasian industrial projects.
Oil & Gas: Isolates wellhead manifolds during maintenance, withstanding hydrogen sulfide (H₂S) levels up to 500 ppm in sour gas environments.
Power Plants: Seals steam turbine bypass lines, maintaining integrity at 450°C+ superheated steam and preventing energy loss in thermal cycles.
Water Treatment: Caps chlorinated water storage tanks (1–3 ppm free chlorine), with optional PTFE coating (50μm thickness) for enhanced chemical resistance.
Q: What gasket material is recommended for PN25?
A: Spiral-wound gaskets (EN 1514-4 Type CG) with 304 metal reinforcement and graphite filler, rated for 2.5 MPa and 450°C, ensure bubble-tight seals.
Q: Can this flange handle vacuum conditions?
A: Yes. For vacuum systems (-1 bar), specify Class 150 equivalent gaskets (e.g., copper-clad asbestos) and torque bolts to 150 N·m to prevent air ingress.
Q: How to verify bolt tightness?
A: Use a digital torque wrench set to 120–150 N·m for M16 A4-70 bolts, following a star pattern (tighten opposite bolts sequentially) to ensure uniform load.
