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BL Flange
SDFL
This ASME B16.5 blind flange stands as a versatile isolation solution for pipeline maintenance, shutdowns, and system modifications. Constructed from high-grade F304/F316 stainless steel—known for their excellent corrosion resistance and mechanical strength—it provides a secure seal for pipe ends while withstanding the demands of high-pressure industrial environments. Unlike welded caps, its bolted design allows for easy access during inspections, making it a cost-effective choice for critical systems requiring frequent maintenance.
Parameter | Details |
Standard | ASME B16.5 (Class 150–2500) with full compliance to dimensional and material requirements |
Material | F304 (304SS, 18Cr-8Ni), F316 (316SS, 18Cr-10Ni-2Mo) with optional F316L for low-carbon applications |
Seal Type | Raised Face (RF) for general service, Ring Joint (RJ) for high-pressure Class 600+ systems |
Temperature Range | -20°C to 450°C (F304, suitable for ambient to moderate heat), -20°C to 600°C (F316, ideal for high-temperature steam) |
Quick Isolation: Bolt-on design enables tool-free disassembly during routine inspections, reducing downtime by up to 30% compared to welded alternatives. The flange’s flat sealing surface ensures uniform gasket compression for reliable isolation.
Heavy-Duty Construction: F316 grade incorporates molybdenum (2-3% content) to resist chloride stress corrosion cracking, making it indispensable in marine or brine systems where salt concentrations exceed 35,000 ppm.
Precision Machining: ASME B16.5 mandates ±1.6mm bolt hole diameter tolerance and Ra 12.5 surface finish on sealing faces, guaranteeing consistent gasket contact and minimizing leak paths.
Multi-Industry Approval: Certified to API 605 standards for large-diameter flanges (NPS 26"–60") and compliant with ASME BPVC Section IX for welding procedures, meeting safety requirements in pressure vessel and pipeline codes.
Refineries: Class 300 RF blind flanges isolate reactor sections during scheduled turnarounds, preventing hydrocarbon leakage in catalytic cracking units operating at 3 MPa pressure.
Water Treatment: F304 blind flanges with flat face (FF) seals are used in chlorinated water lines, where their non-reactive surface resists degradation from chlorine levels up to 5 ppm.
LNG Terminals: RJ-sealed F316 flanges maintain integrity in cryogenic LNG storage tanks, withstanding temperatures as low as -162°C while preventing cold gas leakage.
Q: How to test the flange’s seal integrity?
A: Perform hydrostatic testing at 1.5x the rated pressure (e.g., 4.5 MPa for Class 300) using a non-asbestos spiral-wound gasket; hold pressure for 30 minutes with no visible leakage or pressure drop exceeding 5%.
Q: Can it handle vacuum conditions?
A: Yes. Select Class 1500+ flanges paired with copper-asbestos or PTFE gaskets to maintain airtight seals in vacuum-rated systems (down to -1 bar), commonly used in chemical distillation columns.
Q: What bolt materials are recommended?
A: Use ASTM A193 B8 (stainless steel) bolts for F304 flanges and ASTM A193 B8M for F316 flanges to ensure material compatibility and corrosion resistance.
This ASME B16.5 blind flange stands as a versatile isolation solution for pipeline maintenance, shutdowns, and system modifications. Constructed from high-grade F304/F316 stainless steel—known for their excellent corrosion resistance and mechanical strength—it provides a secure seal for pipe ends while withstanding the demands of high-pressure industrial environments. Unlike welded caps, its bolted design allows for easy access during inspections, making it a cost-effective choice for critical systems requiring frequent maintenance.
Parameter | Details |
Standard | ASME B16.5 (Class 150–2500) with full compliance to dimensional and material requirements |
Material | F304 (304SS, 18Cr-8Ni), F316 (316SS, 18Cr-10Ni-2Mo) with optional F316L for low-carbon applications |
Seal Type | Raised Face (RF) for general service, Ring Joint (RJ) for high-pressure Class 600+ systems |
Temperature Range | -20°C to 450°C (F304, suitable for ambient to moderate heat), -20°C to 600°C (F316, ideal for high-temperature steam) |
Quick Isolation: Bolt-on design enables tool-free disassembly during routine inspections, reducing downtime by up to 30% compared to welded alternatives. The flange’s flat sealing surface ensures uniform gasket compression for reliable isolation.
Heavy-Duty Construction: F316 grade incorporates molybdenum (2-3% content) to resist chloride stress corrosion cracking, making it indispensable in marine or brine systems where salt concentrations exceed 35,000 ppm.
Precision Machining: ASME B16.5 mandates ±1.6mm bolt hole diameter tolerance and Ra 12.5 surface finish on sealing faces, guaranteeing consistent gasket contact and minimizing leak paths.
Multi-Industry Approval: Certified to API 605 standards for large-diameter flanges (NPS 26"–60") and compliant with ASME BPVC Section IX for welding procedures, meeting safety requirements in pressure vessel and pipeline codes.
Refineries: Class 300 RF blind flanges isolate reactor sections during scheduled turnarounds, preventing hydrocarbon leakage in catalytic cracking units operating at 3 MPa pressure.
Water Treatment: F304 blind flanges with flat face (FF) seals are used in chlorinated water lines, where their non-reactive surface resists degradation from chlorine levels up to 5 ppm.
LNG Terminals: RJ-sealed F316 flanges maintain integrity in cryogenic LNG storage tanks, withstanding temperatures as low as -162°C while preventing cold gas leakage.
Q: How to test the flange’s seal integrity?
A: Perform hydrostatic testing at 1.5x the rated pressure (e.g., 4.5 MPa for Class 300) using a non-asbestos spiral-wound gasket; hold pressure for 30 minutes with no visible leakage or pressure drop exceeding 5%.
Q: Can it handle vacuum conditions?
A: Yes. Select Class 1500+ flanges paired with copper-asbestos or PTFE gaskets to maintain airtight seals in vacuum-rated systems (down to -1 bar), commonly used in chemical distillation columns.
Q: What bolt materials are recommended?
A: Use ASTM A193 B8 (stainless steel) bolts for F304 flanges and ASTM A193 B8M for F316 flanges to ensure material compatibility and corrosion resistance.
