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BL Flange
SDFL
Engineered as a high-pressure isolation solution, this EN 1092-1 05B DN15 PN25 SS304 blind flange integrates robust structural integrity with exceptional corrosion resistance. Its precision-machined blank face design (Type 05B) guarantees leak-free sealing even at 2.5 MPa (PN25) operating pressure, making it ideal for critical pipeline systems. Constructed from 304 stainless steel (1.4301)—a material renowned for its 18% chromium and 8% nickel composition—it delivers long-term durability in corrosive environments ranging from chemical processing plants to marine engineering applications.
Parameter | Details |
Standard | EN 1092-1 Type 05B (Blind Flange) |
Material | Stainless steel 304 (1.4301) |
Pressure Rating | PN25 (2.5 MPa) |
Dimensions | OD: 95mm, Bolt Circle: 65mm, Thickness: 14mm |
Bolt Holes | 4x M12 (pitch circle diameter 65mm) |
Seal Type | Flat Face (FF) |
Temperature Range | -20°C to 400°C |
High-Pressure Performance: The flat face design ensures uniform gasket compression across the entire sealing surface, validated through hydrostatic testing at 3.75 MPa (1.5 times the rated pressure) to meet EN 13445 standards .
Corrosion Resistance: 304 stainless steel forms a passive oxide layer that resists pH 4–8 chemical environments, making it suitable for mild acids, alkalis, and food-grade applications requiring strict hygiene compliance.
Reinforced 05B Design: Thicker profile (14mm) with reinforced edges enhances resistance to bending stress in high-vibration systems, such as reciprocating pump pipelines.
Multi-Certification: Compliant with ASME BPVC Section VIII for pressure vessel applications and PED 2014/68/EU for European market access, ensuring safety across global industries.
Chemical Processing: Effectively isolates reactor vessels during maintenance shutdowns, withstanding 2.5 MPa+ pressure in environments handling sulfuric acid and sodium hydroxide solutions.
Marine Engineering: Seals shipboard ballast water tanks and seawater cooling lines, where 304 stainless steel resists saltwater corrosion in offshore and coastal installations.
HVAC Systems: Used in steam condensate lines of power plants, maintaining integrity at 400°C temperatures in boiler feedwater circuits.
Q: What gasket material is recommended for PN25 applications?
A: Spiral-wound gaskets with graphite filler (EN 1514-4) are ideal, providing metal-to-metal sealing capability under high bolt loads.
Q: Can this flange be used in cryogenic environments?
A: For temperatures below -20°C, upgrade to 316L stainless steel (1.4404)—a low-carbon variant offering improved ductility to prevent brittle fracture.
Q: How to ensure proper bolt tightness?
A: Use a calibrated torque wrench set to 35–40 N·m for M12 bolts, following a diagonal cross-tightening sequence to ensure uniform pressure distribution.
Engineered as a high-pressure isolation solution, this EN 1092-1 05B DN15 PN25 SS304 blind flange integrates robust structural integrity with exceptional corrosion resistance. Its precision-machined blank face design (Type 05B) guarantees leak-free sealing even at 2.5 MPa (PN25) operating pressure, making it ideal for critical pipeline systems. Constructed from 304 stainless steel (1.4301)—a material renowned for its 18% chromium and 8% nickel composition—it delivers long-term durability in corrosive environments ranging from chemical processing plants to marine engineering applications.
Parameter | Details |
Standard | EN 1092-1 Type 05B (Blind Flange) |
Material | Stainless steel 304 (1.4301) |
Pressure Rating | PN25 (2.5 MPa) |
Dimensions | OD: 95mm, Bolt Circle: 65mm, Thickness: 14mm |
Bolt Holes | 4x M12 (pitch circle diameter 65mm) |
Seal Type | Flat Face (FF) |
Temperature Range | -20°C to 400°C |
High-Pressure Performance: The flat face design ensures uniform gasket compression across the entire sealing surface, validated through hydrostatic testing at 3.75 MPa (1.5 times the rated pressure) to meet EN 13445 standards .
Corrosion Resistance: 304 stainless steel forms a passive oxide layer that resists pH 4–8 chemical environments, making it suitable for mild acids, alkalis, and food-grade applications requiring strict hygiene compliance.
Reinforced 05B Design: Thicker profile (14mm) with reinforced edges enhances resistance to bending stress in high-vibration systems, such as reciprocating pump pipelines.
Multi-Certification: Compliant with ASME BPVC Section VIII for pressure vessel applications and PED 2014/68/EU for European market access, ensuring safety across global industries.
Chemical Processing: Effectively isolates reactor vessels during maintenance shutdowns, withstanding 2.5 MPa+ pressure in environments handling sulfuric acid and sodium hydroxide solutions.
Marine Engineering: Seals shipboard ballast water tanks and seawater cooling lines, where 304 stainless steel resists saltwater corrosion in offshore and coastal installations.
HVAC Systems: Used in steam condensate lines of power plants, maintaining integrity at 400°C temperatures in boiler feedwater circuits.
Q: What gasket material is recommended for PN25 applications?
A: Spiral-wound gaskets with graphite filler (EN 1514-4) are ideal, providing metal-to-metal sealing capability under high bolt loads.
Q: Can this flange be used in cryogenic environments?
A: For temperatures below -20°C, upgrade to 316L stainless steel (1.4404)—a low-carbon variant offering improved ductility to prevent brittle fracture.
Q: How to ensure proper bolt tightness?
A: Use a calibrated torque wrench set to 35–40 N·m for M12 bolts, following a diagonal cross-tightening sequence to ensure uniform pressure distribution.
