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SO Flange
SDFL
| Nominal Size | Outer Diameter | Central circle diameter | Bolt Hole Diameter | Number of Bolt Holes | Inner Diameter | Flange Ring Height | Weld Groove Diameter | Flange Overall Height | Sealing Face Diameter | Sealing Face Height | |
| DN | NPS | A | J | I | B | C | F | D | G | ||
| 15 | 1/2 | 88.9 | 60.5 | 15.7 | 4 | 22.4 | 11.2 | 30.2 | 15.7 | 35.1 | 1.6 |
| 20 | 3/4 | 98.6 | 69.9 | 15.7 | 4 | 27.7 | 12.7 | 38.1 | 15.7 | 42.9 | 1.6 |
| 25 | 1 | 108 | 79.3 | 15.7 | 4 | 34.5 | 14.2 | 49.3 | 17.5 | 50.8 | 1.6 |
| 32 | 1-1/4 | 117.3 | 88.9 | 15.7 | 4 | 43.2 | 15.7 | 58.7 | 20.6 | 63.5 | 1.6 |
| 40 | 1-1/2 | 127 | 98.6 | 15.7 | 4 | 49.5 | 17.5 | 65 | 22.4 | 73.15 | 1.6 |
| 50 | 2 | 152.4 | 120.7 | 19.1 | 4 | 62 | 19.1 | 77.7 | 25.4 | 91.9 | 1.6 |
| 65 | 2-1/2 | 177.8 | 139.7 | 19.1 | 4 | 74.7 | 22.4 | 90.4 | 28.4 | 104.6 | 1.6 |
| 80 | 3 | 190.5 | 152.4 | 19.1 | 4 | 90.7 | 23.9 | 108 | 30.2 | 127 | 1.6 |
| 90 | 3-1/2 | 215.9 | 177.8 | 19.1 | 8 | 103.4 | 23.9 | 122.2 | 31.75 | 139.7 | 1.6 |
| 100 | 4 | 228.6 | 190.5 | 19.1 | 8 | 116.1 | 23.9 | 134.9 | 33.3 | 157.2 | 1.6 |
| 125 | 5 | 254 | 215.9 | 22.4 | 8 | 143.8 | 23.9 | 163.6 | 36.6 | 185.7 | 1.6 |
| 150 | 6 | 279.4 | 241.3 | 22.4 | 8 | 170.7 | 25.4 | 192 | 39.6 | 215.9 | 1.6 |
| 200 | 8 | 342.9 | 298.5 | 22.4 | 8 | 221.5 | 28.4 | 246.1 | 44.5 | 269.7 | 1.6 |
| 250 | 10 | 406.4 | 362 | 25.4 | 12 | 276.3 | 30.2 | 304.8 | 49.3 | 323.9 | 1.6 |
| 300 | 12 | 482.6 | 431.8 | 25.4 | 12 | 327.1 | 31.75 | 365.3 | 55.6 | 381 | 1.6 |
| 350 | 14 | 533.4 | 476.3 | 28.4 | 12 | 359.1 | 35.1 | 400.1 | 57.15 | 412.8 | 1.6 |
| 400 | 16 | 596.9 | 539.8 | 28.4 | 16 | 410.5 | 36.6 | 457.2 | 63.5 | 469.9 | 1.6 |
| 450 | 18 | 635 | 577.9 | 31.8 | 16 | 461.8 | 39.6 | 505 | 68.3 | 533.4 | 1.6 |
| 500 | 20 | 698.5 | 635 | 31.8 | 20 | 513.1 | 42.9 | 558.8 | 73.15 | 584.2 | 1.6 |
| 600 | 24 | 812.8 | 749.3 | 35.1 | 20 | 616 | 47.8 | 663.4 | 82.6 | 692.2 | 1.6 |
Application Field
Oil & Gas Industry:Low-Medium Pressure Piping Systems, Maintenance & Temporary Connections.
Chemical & Pharmaceutical :Corrosive Fluid Handling, Multi-Product Line Switching.
Power & Energy:Thermal Plant Cooling Systems, Renewable Energy.
Shipbuilding & Offshore:Ship Propulsion Systems, Offshore Platform Auxiliary Lines.
Water Treatment & Municipal:Water Supply Networks, Wastewater Plants.
Food & Beverage:Sanitary Piping, Clean-in-Place Systems.
Construction & HVAC:Central HVAC Systems, Fire Sprinkler Networks.
Mining & Metallurgy:Slurry Transportation, Smelter Cooling Water.
Characteristics
1.Easy Installation:
(1)Slides directly over pipe end, aligned before welding.
(2)Requires only fillet welds (inside & outside).
2.Lower Cost:
(1)Material cost ~30% less than WN flanges.
(2)Reduced machining complexity.
3.Compact Design:
(1)Shorter assembly length vs. WN flanges.
(2)Saves space in tight layouts.
4.Moderate Pressure Tolerance:
(1)Max pressure: Class 300 (PN40) at room temperature.
(2)Strength decreases significantly at high temperatures.
5.Stress Concentration Risk:
(1)Sudden transition at weld joints causes higher stress.
(2)Unsuitable for cyclic/shock loads.
6.Limited NDT Access:
Internal fillet weld hard to inspect via RT/UT.
