Engineers mainly use ASTM A182 F316 blind flange in piping systems, especially when the process needs to be changed or repaired. It can not only be used as an end cover for the piping system, but also can be used to isolate and close a certain part in the piping system.
Manufacturers produce it from various materials depending on the application requirements, including carbon steel, stainless steel, alloy steel, and nickel alloys, which provide resistance to high temperatures and corrosive environments. F316 blind flange is widely used in pipeline systems in petroleum, chemical, food, medicine and other industries.
Specification of Blind Flange
| Sealing Face | RF, FF, FTJ |
| Size Range | 1/2” – 48” / DN15 – DN1200 |
| Pressure Rating | Class 150, 300, 600, 900, 1500, 2500lb |
| Standard | ASME / ANSI B16.5, ASME B16.47 Series A/B |
| Carbon Steel | ASTM A105 / A105N |
| Low Temp Carbon Steel | ASTM A350 LF2/LF3 |
| Pipeline Steel | ASTM A694 F42 / 46 / 56 / 60 / 65 |
| Alloy Steel | ASTM A182 F11 / 12 / 5 / 9 / 91 / 92 |
| Stainless Steel | ASTM A182 F304/304L/304H, 316/316L, 310S, 317,347,904L |
| Duplex Stainless Steel | ASTM A182 F51, F53, F44 |
Key Features & Benefits
Superior Corrosion Resistance — Molybdenum improves resistance to chlorides, acidic environments.
Pressure Sealing — Ideal for terminating pipes or isolating process segments.
High Strength — Suitable for high-pressure applications.
Easy Maintenance Access — Can be unbolted to inspect or clean pipe systems.
Blind Flange Dimensions
| NPS | A | C | G | H | I | J | W |
| inch | No. of holes | inch | kg/pc | ||||
| mm | mm | ||||||
| 1/2 | 3.500 | 0.440 | 1.380 | 4 | 0.620 | 2.380 | 0.42 |
| 88.90 | 11.20 | 35.10 | 15.70 | 60.45 | |||
| 3/4 | 3.880 | 0.500 | 1.690 | 4 | 0.620 | 2.750 | 0.61 |
| 98.60 | 12.70 | 42.90 | 15.70 | 69.85 | |||
| 1 | 4.250 | 0.560 | 2.000 | 4 | 0.620 | 3.120 | 0.86 |
| 108.0 | 14.20 | 50.80 | 15.70 | 79.25 | |||
| 1-1/4 | 4.620 | 0.620 | 2.500 | 4 | 0.620 | 3.500 | 1.17 |
| 117.3 | 15.70 | 63.50 | 15.70 | 88.90 | |||
| 1-1/2 | 5.000 | 0.690 | 2.880 | 4 | 0.620 | 3.880 | 1.53 |
| 127.0 | 17.50 | 73.15 | 15.70 | 98.60 | |||
| 2 | 6.000 | 0.750 | 3.620 | 4 | 0.750 | 4.750 | 2.42 |
| 152.4 | 19.10 | 91.90 | 19.10 | 120.7 | |||
| 2-1/2 | 7.000 | 0.880 | 4.120 | 4 | 0.750 | 5.500 | 3.94 |
| 177.8 | 22.40 | 104.6 | 19.10 | 139.7 | |||
| 3 | 7.500 | 0.940 | 5.000 | 4 | 0.750 | 6.000 | 4.93 |
| 190.5 | 23.90 | 127.0 | 19.10 | 152.4 | |||
| 3-1/2 | 8.500 | 0.940 | 5.500 | 8 | 0.750 | 7.000 | 6.17 |
| 215.9 | 23.90 | 139.7 | 19.10 | 177.8 | |||
| 4 | 9.000 | 0.940 | 6.190 | 8 | 0.750 | 7.500 | 7.00 |
| 228.6 | 23.90 | 157.2 | 19.10 | 190.5 | |||
| 5 | 10.00 | 0.940 | 7.310 | 8 | 0.880 | 8.500 | 8.63 |
| 254.0 | 23.90 | 185.7 | 22.40 | 215.9 | |||
| 6 | 11.00 | 1.000 | 8.500 | 8 | 0.880 | 9.500 | 11.3 |
| 279.4 | 25.40 | 215.9 | 22.40 | 241.3 | |||
| 8 | 13.50 | 1.120 | 10.62 | 8 | 0.880 | 11.75 | 19.6 |
| 342.9 | 28.40 | 269.7 | 22.40 | 298.5 | |||
| 10 | 16.00 | 1.190 | 12.75 | 12 | 1.000 | 14.25 | 28.8 |
| 406.4 | 30.20 | 323.9 | 25.40 | 362.0 | |||
| 12 | 19.00 | 1.250 | 15.00 | 12 | 1.000 | 17.00 | 43.2 |
| 482.6 | 31.75 | 381.0 | 25.40 | 431.8 | |||
| 14 | 21.00 | 1.380 | 16.25 | 12 | 1.120 | 18.75 | 58.1 |
| 533.4 | 35.10 | 412.8 | 28.40 | 476.3 | |||
| 16 | 23.50 | 1.440 | 18.50 | 16 | 1.120 | 21.25 | 76.0 |
| 596.9 | 36.60 | 469.9 | 28.40 | 539.8 | |||
| 18 | 25.00 | 1.560 | 21.00 | 16 | 1.250 | 22.75 | 93.7 |
| 635.0 | 39.60 | 533.4 | 31.75 | 577.9 | |||
| 20 | 27.50 | 1.690 | 23.00 | 20 | 1.250 | 25.00 | 122 |
| 698.5 | 42.90 | 584.2 | 31.75 | 635.0 | |||
| 24 | 32.00 | 1.880 | 27.25 | 20 | 1.380 | 29.50 | 185 |
| 812.8 | 47.80 | 692.2 | 35.10 | 749.3 | |||
A182 F316 Blind Flange Pressure Rating Table
| Table Il-2-2.2 Pressure-Temperature Ratings for Group 2.2 Materials | |||||||
| Nominal Designation |
Forgings | Castings | Plates | ||||
| 16Cr-12Ni-2Mo | A182 Gr.F316(1) | A351 Gr.CF3M(2) | A240 Gr.316(1) | ||||
| 16Cr-12Ni-2Mo | A182 Gr.F316H | A351 Gr.CF8M (1) | A240 Gr.316H | ||||
| Working Pressures by Classes,psig | |||||||
| Class | |||||||
| Temp.,F | 150 | 300 | 400 | 600 | 900 | 1500 | 2500 |
| -20 to 100 | 275 | 720 | 960 | 1440 | 2160 | 3600 | 6000 |
| 200 | 235 | 620 | 825 | 1240 | 1860 | 3095 | 5160 |
| 300 | 215 | 560 | 745 | 1120 | 1680 | 2795 | 4660 |
| 400 | 195 | 515 | 685 | 1.025 | 1540 | 2570 | 4280 |
| 500 | 170 | 480 | 635 | 955 | 1435 | 2390 | 3980 |
| 600 | 140 | 450 | 600 | 900 | 1355 | 2255 | 3760 |
| 650 | 125 | 440 | 590 | 885 | 1325 | 2210 | 3680 |
| 700 | 110 | 435 | 580 | 870 | 1305 | 2170 | 3620 |
| 750 | 95 | 425 | 570 | 855 | 1280 | 2135 | 3560 |
| 800 | 80 | 420 | 565 | 845 | 1265 | 2110 | 3520 |
| 850 | 65 | 420 | 555 | 835 | 1255 | 2090 | 3480 |
| 900 | 50 | 415 | 555 | 830 | 1245 | 2075 | 3460 |
| 950 | 35 | 385 | 515 | 775 | 1160 | 1930 | 3220 |
| 1000 | 20 | 365 | 485 | 725 | 1090 | 1820 | 3030 |
| 1050 | 360 | 480 | 720 | 1080 | 1800 | 3000 | |
| 1100 | 305 | 405 | 610 | 915 | 1525 | 2545 | |
| 1150 | 235 | 315 | 475 | 710 | 1185 | 1970 | |
| 1200 | 185 | 245 | 370 | 555 | 925 | 1545 | |
| 1250 | 145 | 195 | 295 | 440 | 735 | 1230 | |
| 1300 | 115 | 155 | 235 | 350 | 585 | 970 | |
| 1350 | 95 | 130 | 190 | 290 | 480 | 800 | |
| 1400 | 75 | 100 | 150 | 225 | 380 | 630 | |
| 1450 | 60 | 80 | 115 | 175 | 290 | 485 | |
| 1500 | 40 | 55 | 85 | 125 | 205 | 345 | |
Comparison of F304 and F316 Materials
304 VS 316 Chemical Composition
| CHEMICAL | LIMITS | C | Mn | P | S | Si | Ni | Cr | Mo | N |
| ASTM A182 F304 | MIN | 8.0 | 18.0 | |||||||
| MAX | 0.08 | 2.00 | 0.045 | 0.030 | 1.00 | 11.0 | 20.0 | 0.10 | ||
| ASTM A182 F316 | MIN | 10.0 | 16.0 | 2.00 | ||||||
| MAX | 0.08 | 2.00 | 0.045 | 0.030 | 1.00 | 14.0 | 18.0 | 3.00 | 0.01 |
In an environment containing chloride ions, the corrosion resistance of A182 F316 blind flange is significantly better than that of F304. Since F304 does not contain molybdenum, its passivation film is easily destroyed by chloride ions, resulting in corrosion. The molybdenum element in F316 enhances the stability of the passivation film and can effectively resist the corrosion of chloride ions.
304 VS 316 Mechanical Property
| MATERIAL | T.S (MPA) | Y.S (MPA) | EL % | R/A % |
| ASTM A182 F304 | 515 min | 205 min | 30 min | 50 min |
| ASTM A182 F316 | 515 min | 205 min | 30 min | 50 min |
In low temperature environment, A182 F316 blind flange has better toughness than F304. This is because the higher nickel content of F316 helps maintain the stability of its austenite structure and prevents embrittlement at low temperatures.
.
Typical Applications
Offshore and Marine Piping
Chemical Processing Plants
Water Treatment Systems
Pharmaceutical and Food Processing
Heat Exchangers, Pumps, and Valve Ends
About Us
We are professional in manufacturing and exporting flanges in various materials.
