 |
| Quantity: | |
|---|---|
BL Flange
SDFL
| Nominal Size | Outer Diameter | Central circle diameter | Bolt Hole Diameter | Number of Bolt Holes | Flange Ring Height | Sealing Face Diameter | Sealing Face Height | |
| DN | NPS | A | J | I | G | |||
| 15 | 1/2 | 95.2 | 66.5 | 15.7 | 4 | 14.2 | 35.1 | 1.6 |
| 20 | 3/4 | 117.3 | 82.6 | 19 | 4 | 15.7 | 42.9 | 1.6 |
| 25 | 1 | 123.9 | 88.9 | 19 | 4 | 17.5 | 50.8 | 1.6 |
| 32 | 1-1/4 | 133.3 | 98.6 | 19 | 4 | 19 | 63.5 | 1.6 |
| 40 | 1-1/2 | 155.4 | 114.3 | 22.3 | 4 | 20.6 | 73.15 | 1.6 |
| 50 | 2 | 165.1 | 127 | 19.1 | 8 | 22.3 | 91.9 | 1.6 |
| 65 | 2-1/2 | 190.5 | 149.4 | 22.3 | 8 | 25.4 | 104.6 | 1.6 |
| 80 | 3 | 209.5 | 168.1 | 22.3 | 8 | 28.4 | 127 | 1.6 |
| 90 | 3-1/2 | 228.6 | 184.2 | 22.3 | 8 | 30.2 | 139.7 | 1.6 |
| 100 | 4 | 254 | 200.1 | 22.3 | 8 | 31.7 | 157.2 | 1.6 |
| 125 | 5 | 279.4 | 234.9 | 22.3 | 8 | 35 | 185.7 | 1.6 |
| 150 | 6 | 317.5 | 269.7 | 22.3 | 12 | 36.5 | 215.9 | 1.6 |
| 200 | 8 | 381 | 330.2 | 25.4 | 12 | 41.1 | 269.7 | 1.6 |
| 250 | 10 | 444.5 | 387.3 | 28.4 | 16 | 47.7 | 323.9 | 1.6 |
| 300 | 12 | 520.7 | 450.8 | 31.7 | 16 | 50.8 | 381 | 1.6 |
| 350 | 14 | 584.2 | 514.3 | 31.7 | 20 | 53.8 | 412.8 | 1.6 |
| 400 | 16 | 647.7 | 571.5 | 35 | 20 | 57.15 | 469.9 | 1.6 |
| 450 | 18 | 711.2 | 628.6 | 35 | 24 | 60.45 | 533.4 | 1.6 |
| 500 | 20 | 774.7 | 685.8 | 35 | 24 | 63.5 | 584.2 | 1.6 |
| 600 | 24 | 914.4 | 812.8 | 41.1 | 24 | 69.85 | 692.2 | 1.6 |
Application Field：
Oil & Gas Industry:Pipeline Maintenance & Isolation, Subsea Pipelines, LNG Terminals, Wellhead Pressure Testing, Tank & Reactor Closure.Chemical & Pharmaceutical:Multi-Product Line Switching, High-Pressure Reactor Safety, Polymerization Reactors
Power & Energy:Boiler & Steam System Shutdown, Nuclear Plant Radiation Containment, Primary Loop.
Water Treatment & Municipal:Water Tank & Network Isolation, Desalination Systems.
Shipbuilding & Offshore:Marine Propulsion System Maintenance, Offshore Platform Safety, Drilling Rigs.
Specialized Industries:Food & Beverage, Aerospace.
Precautions for Use：
Pressure Rating Match:Select blind flanges matching pipeline pressure (e.g., Class 150, PN20), avoiding overpressure failure (per ASME B16.5, GB/T 9123).
Material Selection:For corrosive media (acids, alkalis, brine): use stainless/alloy steel (e.g., 316L for chloride resistance).
Sealing Surface Inspection:Before installation: clean sealing surfaces (RF/FF/TG) of scratches/impurities.During installation: tighten bolts evenly (cross - pattern), use torque wrench in stages (e.g., 50 - 100 N·m per specification) to avoid uneven load leakage.
Pressure - Bearing Operation Safety:When working under pressure: depressurize first (pipeline pressure ≤0), operate by certified personnel, wear PPE (goggles, acid - resistant gloves), following GB 30871 for petrochemical blind - flange operations.
Marking & Documentation:Mark blind - flange locations on P&IDs/site (e.g., "BL - 01, DN50, Class 300"), document installation time, pressure rating, material for maintenance traceability (e.g., petrochemical "blind - flange ledger").
| Nominal Size | Outer Diameter | Central circle diameter | Bolt Hole Diameter | Number of Bolt Holes | Flange Ring Height | Sealing Face Diameter | Sealing Face Height | |
| DN | NPS | A | J | I | G | |||
| 15 | 1/2 | 95.2 | 66.5 | 15.7 | 4 | 14.2 | 35.1 | 1.6 |
| 20 | 3/4 | 117.3 | 82.6 | 19 | 4 | 15.7 | 42.9 | 1.6 |
| 25 | 1 | 123.9 | 88.9 | 19 | 4 | 17.5 | 50.8 | 1.6 |
| 32 | 1-1/4 | 133.3 | 98.6 | 19 | 4 | 19 | 63.5 | 1.6 |
| 40 | 1-1/2 | 155.4 | 114.3 | 22.3 | 4 | 20.6 | 73.15 | 1.6 |
| 50 | 2 | 165.1 | 127 | 19.1 | 8 | 22.3 | 91.9 | 1.6 |
| 65 | 2-1/2 | 190.5 | 149.4 | 22.3 | 8 | 25.4 | 104.6 | 1.6 |
| 80 | 3 | 209.5 | 168.1 | 22.3 | 8 | 28.4 | 127 | 1.6 |
| 90 | 3-1/2 | 228.6 | 184.2 | 22.3 | 8 | 30.2 | 139.7 | 1.6 |
| 100 | 4 | 254 | 200.1 | 22.3 | 8 | 31.7 | 157.2 | 1.6 |
| 125 | 5 | 279.4 | 234.9 | 22.3 | 8 | 35 | 185.7 | 1.6 |
| 150 | 6 | 317.5 | 269.7 | 22.3 | 12 | 36.5 | 215.9 | 1.6 |
| 200 | 8 | 381 | 330.2 | 25.4 | 12 | 41.1 | 269.7 | 1.6 |
| 250 | 10 | 444.5 | 387.3 | 28.4 | 16 | 47.7 | 323.9 | 1.6 |
| 300 | 12 | 520.7 | 450.8 | 31.7 | 16 | 50.8 | 381 | 1.6 |
| 350 | 14 | 584.2 | 514.3 | 31.7 | 20 | 53.8 | 412.8 | 1.6 |
| 400 | 16 | 647.7 | 571.5 | 35 | 20 | 57.15 | 469.9 | 1.6 |
| 450 | 18 | 711.2 | 628.6 | 35 | 24 | 60.45 | 533.4 | 1.6 |
| 500 | 20 | 774.7 | 685.8 | 35 | 24 | 63.5 | 584.2 | 1.6 |
| 600 | 24 | 914.4 | 812.8 | 41.1 | 24 | 69.85 | 692.2 | 1.6 |
Application Field：
Oil & Gas Industry:Pipeline Maintenance & Isolation, Subsea Pipelines, LNG Terminals, Wellhead Pressure Testing, Tank & Reactor Closure.Chemical & Pharmaceutical:Multi-Product Line Switching, High-Pressure Reactor Safety, Polymerization Reactors
Power & Energy:Boiler & Steam System Shutdown, Nuclear Plant Radiation Containment, Primary Loop.
Water Treatment & Municipal:Water Tank & Network Isolation, Desalination Systems.
Shipbuilding & Offshore:Marine Propulsion System Maintenance, Offshore Platform Safety, Drilling Rigs.
Specialized Industries:Food & Beverage, Aerospace.
Precautions for Use：
Pressure Rating Match:Select blind flanges matching pipeline pressure (e.g., Class 150, PN20), avoiding overpressure failure (per ASME B16.5, GB/T 9123).
Material Selection:For corrosive media (acids, alkalis, brine): use stainless/alloy steel (e.g., 316L for chloride resistance).
Sealing Surface Inspection:Before installation: clean sealing surfaces (RF/FF/TG) of scratches/impurities.During installation: tighten bolts evenly (cross - pattern), use torque wrench in stages (e.g., 50 - 100 N·m per specification) to avoid uneven load leakage.
Pressure - Bearing Operation Safety:When working under pressure: depressurize first (pipeline pressure ≤0), operate by certified personnel, wear PPE (goggles, acid - resistant gloves), following GB 30871 for petrochemical blind - flange operations.
Marking & Documentation:Mark blind - flange locations on P&IDs/site (e.g., "BL - 01, DN50, Class 300"), document installation time, pressure rating, material for maintenance traceability (e.g., petrochemical "blind - flange ledger").
