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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 | 6.4 |
| 20 | 3/4 | 117.3 | 82.6 | 19.1 | 4 | 15.7 | 42.9 | 6.4 |
| 25 | 1 | 123.9 | 88.9 | 19.1 | 4 | 17.5 | 50.8 | 6.4 |
| 32 | 1-1/4 | 133.3 | 98.6 | 19.1 | 4 | 20.6 | 63.5 | 6.4 |
| 40 | 1-1/2 | 155.4 | 114.3 | 22.4 | 4 | 22.3 | 73.15 | 6.4 |
| 50 | 2 | 165.1 | 127 | 19.1 | 8 | 25.4 | 91.9 | 6.4 |
| 65 | 2-1/2 | 190.5 | 149.4 | 22.4 | 8 | 28.4 | 104.6 | 6.4 |
| 80 | 3 | 209.5 | 168.1 | 22.4 | 8 | 31.7 | 127 | 6.4 |
| 100 | 4 | 254 | 200.2 | 25.4 | 8 | 35.1 | 157.2 | 6.4 |
| 125 | 5 | 279.4 | 235 | 25.4 | 8 | 38.1 | 185.7 | 6.4 |
| 150 | 6 | 317.5 | 269.7 | 25.4 | 12 | 41.1 | 215.9 | 6.4 |
| 200 | 8 | 381 | 330.2 | 28.4 | 12 | 47.8 | 269.7 | 6.4 |
| 250 | 10 | 444.5 | 387.4 | 31.8 | 16 | 53.8 | 323.9 | 6.4 |
| 300 | 12 | 520.7 | 450.9 | 35.1 | 16 | 57.15 | 381 | 6.4 |
| 350 | 14 | 584.2 | 514.4 | 35.1 | 20 | 60.45 | 412.8 | 6.4 |
| 400 | 16 | 647.7 | 571.5 | 38.1 | 20 | 63.5 | 469.9 | 6.4 |
| 450 | 18 | 711.2 | 628.7 | 38.1 | 24 | 66.55 | 533.4 | 6.4 |
| 500 | 20 | 774.7 | 685.8 | 41.1 | 24 | 69.85 | 584.2 | 6.4 |
| 600 | 24 | 914.4 | 812.8 | 47.8 | 24 | 76.2 | 692.2 | 6.4 |
Blind Flange is a type of flange without a central hole. It is mainly used to block, isolate, or repair pipeline systems, ensuring safety and tightness. It plays an important role in industrial pipelines. The following are its main application scenarios and function descriptions:
1.Pipeline system inspection and maintenance
When a certain section of the pipeline needs to be repaired, cleaned, or replaced, the blind flange can temporarily seal the pipeline to prevent medium leakage or the entry of external impurities.
2.Pressure testing and system isolation
In newly built or renovated pipeline systems, pressure testing (hydrostatic/pneumatic testing) is required. The blind flange can be used to seal the pipe ends to ensure the accuracy of the test.
3.Temporary blocking of multi - branch pipelines
In industries such as chemical and petroleum, some branch pipelines may not be used temporarily but may need to be re - activated in the future. The blind flange can be used for temporary blocking to avoid pipeline removal.
Advantageous technology achieves user benefits
Absolute sealing without holes design+metal gasket with zero leakage, ensuring safety
High pressure resistant thickened structure+high-strength material suitable for extreme working conditions
Quick disassembly and assembly of bolted connections, welding free, saving maintenance time by over 30%
Corrosion resistant special materials/surface treatment extend pipeline life
Standardized ASME/EN/GB certification compliance, worry free, globally applicable
| 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 | 6.4 |
| 20 | 3/4 | 117.3 | 82.6 | 19.1 | 4 | 15.7 | 42.9 | 6.4 |
| 25 | 1 | 123.9 | 88.9 | 19.1 | 4 | 17.5 | 50.8 | 6.4 |
| 32 | 1-1/4 | 133.3 | 98.6 | 19.1 | 4 | 20.6 | 63.5 | 6.4 |
| 40 | 1-1/2 | 155.4 | 114.3 | 22.4 | 4 | 22.3 | 73.15 | 6.4 |
| 50 | 2 | 165.1 | 127 | 19.1 | 8 | 25.4 | 91.9 | 6.4 |
| 65 | 2-1/2 | 190.5 | 149.4 | 22.4 | 8 | 28.4 | 104.6 | 6.4 |
| 80 | 3 | 209.5 | 168.1 | 22.4 | 8 | 31.7 | 127 | 6.4 |
| 100 | 4 | 254 | 200.2 | 25.4 | 8 | 35.1 | 157.2 | 6.4 |
| 125 | 5 | 279.4 | 235 | 25.4 | 8 | 38.1 | 185.7 | 6.4 |
| 150 | 6 | 317.5 | 269.7 | 25.4 | 12 | 41.1 | 215.9 | 6.4 |
| 200 | 8 | 381 | 330.2 | 28.4 | 12 | 47.8 | 269.7 | 6.4 |
| 250 | 10 | 444.5 | 387.4 | 31.8 | 16 | 53.8 | 323.9 | 6.4 |
| 300 | 12 | 520.7 | 450.9 | 35.1 | 16 | 57.15 | 381 | 6.4 |
| 350 | 14 | 584.2 | 514.4 | 35.1 | 20 | 60.45 | 412.8 | 6.4 |
| 400 | 16 | 647.7 | 571.5 | 38.1 | 20 | 63.5 | 469.9 | 6.4 |
| 450 | 18 | 711.2 | 628.7 | 38.1 | 24 | 66.55 | 533.4 | 6.4 |
| 500 | 20 | 774.7 | 685.8 | 41.1 | 24 | 69.85 | 584.2 | 6.4 |
| 600 | 24 | 914.4 | 812.8 | 47.8 | 24 | 76.2 | 692.2 | 6.4 |
Blind Flange is a type of flange without a central hole. It is mainly used to block, isolate, or repair pipeline systems, ensuring safety and tightness. It plays an important role in industrial pipelines. The following are its main application scenarios and function descriptions:
1.Pipeline system inspection and maintenance
When a certain section of the pipeline needs to be repaired, cleaned, or replaced, the blind flange can temporarily seal the pipeline to prevent medium leakage or the entry of external impurities.
2.Pressure testing and system isolation
In newly built or renovated pipeline systems, pressure testing (hydrostatic/pneumatic testing) is required. The blind flange can be used to seal the pipe ends to ensure the accuracy of the test.
3.Temporary blocking of multi - branch pipelines
In industries such as chemical and petroleum, some branch pipelines may not be used temporarily but may need to be re - activated in the future. The blind flange can be used for temporary blocking to avoid pipeline removal.
Advantageous technology achieves user benefits
Absolute sealing without holes design+metal gasket with zero leakage, ensuring safety
High pressure resistant thickened structure+high-strength material suitable for extreme working conditions
Quick disassembly and assembly of bolted connections, welding free, saving maintenance time by over 30%
Corrosion resistant special materials/surface treatment extend pipeline life
Standardized ASME/EN/GB certification compliance, worry free, globally applicable
