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What is Blind Flange
Flanges are used to connect pipes with each other, to valves, to fittings, and to specialty items such as strainers and pressure vessels and then the cover plate will be connected to create the - Blind Flange".
Blind flange could also called blind disk or flange pipe plug what owing to their function way. Actually the blind flange has no holes in the center and for to seal the pipe opening. The difference is blind flange is a detachable equipment, easy to replace or do maintenance.
Alloy Steel Blind Flange application are popular in many field, such as chemical industry and oil&gas project. Alloy Steel Blind Flange is a solid disk used to block off a pipeline or to create a stop what is useful for making repairs to a pipeline and for expansion or continuation of the pipeline simply by adding onto the final flange.
Specification of ASME B16.5 Forged Steel Flanges
ASME B16.5 standard covers pressure temperature ratings, materials, dimensions, tolerances, marking, testing and methods of designating openings for pipe flanges and flanged fittings. Such as weld neck flanges, slip-on flanges, socket weld flanges, threaded flanges, blind flanges, lap joint flanges and flangolets.
| Sealing Face | RF, FF, FTJ |
| Size Range | 1/2"- 60"/ DN15-DN1500 |
| Pressure Rating | Class 150, 300, 600, 900, 1500, 2500lb |
| Standard | ASME / ANSI B16.5, ASME B16.47 Series A/B |
| Alloy Steel | ASTM A182 F11 / 12 / 5 / 9 / 91 / 92 |
ASTM A182 F11 Blind Flange
ASTM A182 F11 is a relatively common alloy flange, which is divided into three grades, each with different chemical composition and mechanical property requirements, to accommodate different environments for pipeline systems.
Chemical Compsition
GRADE | LIMIT | C | Mn | P | S | Si | Cr | Mo |
ASTM A182 F11 CLASS1 | MIN | 0.05 | 0.30 | 0.50 | 1.00 | 0.44 | ||
MAX | 0.15 | 0.60 | 0.030 | 0.030 | 1.00 | 1.50 | 0.65 | |
ASTM A182 F11 CLASS2 | MIN | 0.10 | 0.30 | 0.50 | 1.00 | 0.44 | ||
MAX | 0.20 | 0.80 | 0.040 | 0.040 | 1.00 | 1.50 | 0.65 | |
ASTM A182 F11 CLASS3 | MIN | 0.10 | 0.30 | 0.50 | 1.00 | 0.44 | ||
MAX | 0.20 | 0.80 | 0.040 | 0.040 | 1.00 | 1.50 | 0.65 |
Mechenical Properties
GRADE | TENSILE STRENGTH MIN （Mpa） | YIELD STRENGTH MIN （Mpa） | ELONGATION MIN | REDUCTION OF AREA MIN | HARDNESS |
ASTM A182 F11 CLASS1 | 415 | 205 | 20 | 45 | 121-174 |
ASTM A182 F11 CLASS2 | 485 | 275 | 20 | 30 | 143-207 |
ASTM A182 F11 CLASS3 | 515 | 310 | 20 | 30 | 156-207 |
Alloy steel blind flange have strong corrosion resistance, high temperature resistance, excellent sealing performance, and rigid and elastic requirements, and are widely used in various industrial fields.
Alloy Steel Blind Flange Testing
We off profession testing for our every client,also ensure that all our materials go through strict quality tests before dispatching them to our clients as below:
• Mechanical Testing Such as Tensile of Area
• Hardness Test
• Chemical Analysis – Spectro Analysis
• Positive Material Identification – PMI Testing
• Micro and Micro Test
Class 150 Blind Flange Dimensions & Weight Chart
| NPS | A | C | G | H | I | J | W |
| inch | inch | inch | No. of holes | inch | inch | kg/pc | |
| mm | mm | mm | mm | mm | |||
| 1/2 | 3.5 | 0.44 | 1.38 | 4 | 0.62 | 2.38 | 0.42 |
| 88.9 | 11.2 | 35.1 | 15.7 | 60.45 | |||
| 3/4 | 3.88 | 0.5 | 1.69 | 4 | 0.62 | 2.75 | 0.61 |
| 98.6 | 12.7 | 42.9 | 15.7 | 69.85 | |||
| 1 | 4.25 | 0.56 | 2 | 4 | 0.62 | 3.12 | 0.86 |
| 108 | 14.2 | 50.8 | 15.7 | 79.25 | |||
| 1-1/4 | 4.62 | 0.62 | 2.5 | 4 | 0.62 | 3.5 | 1.17 |
| 117.3 | 15.7 | 63.5 | 15.7 | 88.9 | |||
| 1-1/2 | 5 | 0.69 | 2.88 | 4 | 0.62 | 3.88 | 1.53 |
| 127 | 17.5 | 73.15 | 15.7 | 98.6 | |||
| 2 | 6 | 0.75 | 3.62 | 4 | 0.75 | 4.75 | 2.42 |
| 152.4 | 19.1 | 91.9 | 19.1 | 120.7 | |||
| 2-1/2 | 7 | 0.88 | 4.12 | 4 | 0.75 | 5.5 | 3.94 |
| 177.8 | 22.4 | 104.6 | 19.1 | 139.7 | |||
| 3 | 7.5 | 0.94 | 5 | 4 | 0.75 | 6 | 4.93 |
| 190.5 | 23.9 | 127 | 19.1 | 152.4 | |||
| 3-1/2 | 8.5 | 0.94 | 5.5 | 8 | 0.75 | 7 | 6.17 |
| 215.9 | 23.9 | 139.7 | 19.1 | 177.8 | |||
| 4 | 9 | 0.94 | 6.19 | 8 | 0.75 | 7.5 | 7 |
| 228.6 | 23.9 | 157.2 | 19.1 | 190.5 | |||
| 5 | 10 | 0.94 | 7.31 | 8 | 0.88 | 8.5 | 8.63 |
| 254 | 23.9 | 185.7 | 22.4 | 215.9 | |||
| 6 | 11 | 1 | 8.5 | 8 | 0.88 | 9.5 | 11.3 |
| 279.4 | 25.4 | 215.9 | 22.4 | 241.3 | |||
| 8 | 13.5 | 1.12 | 10.62 | 8 | 0.88 | 11.75 | 19.6 |
| 342.9 | 28.4 | 269.7 | 22.4 | 298.5 | |||
| 10 | 16 | 1.19 | 12.75 | 12 | 1 | 14.25 | 28.8 |
| 406.4 | 30.2 | 323.9 | 25.4 | 362 | |||
| 12 | 19 | 1.25 | 15 | 12 | 1 | 17 | 43.2 |
| 482.6 | 31.75 | 381 | 25.4 | 431.8 | |||
| 14 | 21 | 1.38 | 16.25 | 12 | 1.12 | 18.75 | 58.1 |
| 533.4 | 35.1 | 412.8 | 28.4 | 476.3 | |||
| 16 | 23.5 | 1.44 | 18.5 | 16 | 1.12 | 21.25 | 76 |
| 596.9 | 36.6 | 469.9 | 28.4 | 539.8 | |||
| 18 | 25 | 1.56 | 21 | 16 | 1.25 | 22.75 | 93.7 |
| 635 | 39.6 | 533.4 | 31.75 | 577.9 | |||
| 20 | 27.5 | 1.69 | 23 | 20 | 1.25 | 25 | 122 |
| 698.5 | 42.9 | 584.2 | 31.75 | 635 | |||
| 24 | 32 | 1.88 | 27.25 | 20 | 1.38 | 29.5 | 185 |
| 812.8 | 47.8 | 692.2 | 35.1 | 749.3 |
Notes:
1) Weights are based on manufacturer's data and are approximate.
2) Flat face flanges may be provided at full thickness, C, or with raised face removed (the latter is nonstandard).
3) If you need class 300 ,600 ,900 ,1500 ,2500 flanges,please contact us.
What is Blind Flange
Flanges are used to connect pipes with each other, to valves, to fittings, and to specialty items such as strainers and pressure vessels and then the cover plate will be connected to create the - Blind Flange".
Blind flange could also called blind disk or flange pipe plug what owing to their function way. Actually the blind flange has no holes in the center and for to seal the pipe opening. The difference is blind flange is a detachable equipment, easy to replace or do maintenance.
Alloy Steel Blind Flange application are popular in many field, such as chemical industry and oil&gas project. Alloy Steel Blind Flange is a solid disk used to block off a pipeline or to create a stop what is useful for making repairs to a pipeline and for expansion or continuation of the pipeline simply by adding onto the final flange.
Specification of ASME B16.5 Forged Steel Flanges
ASME B16.5 standard covers pressure temperature ratings, materials, dimensions, tolerances, marking, testing and methods of designating openings for pipe flanges and flanged fittings. Such as weld neck flanges, slip-on flanges, socket weld flanges, threaded flanges, blind flanges, lap joint flanges and flangolets.
| Sealing Face | RF, FF, FTJ |
| Size Range | 1/2"- 60"/ DN15-DN1500 |
| Pressure Rating | Class 150, 300, 600, 900, 1500, 2500lb |
| Standard | ASME / ANSI B16.5, ASME B16.47 Series A/B |
| Alloy Steel | ASTM A182 F11 / 12 / 5 / 9 / 91 / 92 |
ASTM A182 F11 Blind Flange
ASTM A182 F11 is a relatively common alloy flange, which is divided into three grades, each with different chemical composition and mechanical property requirements, to accommodate different environments for pipeline systems.
Chemical Compsition
GRADE | LIMIT | C | Mn | P | S | Si | Cr | Mo |
ASTM A182 F11 CLASS1 | MIN | 0.05 | 0.30 | 0.50 | 1.00 | 0.44 | ||
MAX | 0.15 | 0.60 | 0.030 | 0.030 | 1.00 | 1.50 | 0.65 | |
ASTM A182 F11 CLASS2 | MIN | 0.10 | 0.30 | 0.50 | 1.00 | 0.44 | ||
MAX | 0.20 | 0.80 | 0.040 | 0.040 | 1.00 | 1.50 | 0.65 | |
ASTM A182 F11 CLASS3 | MIN | 0.10 | 0.30 | 0.50 | 1.00 | 0.44 | ||
MAX | 0.20 | 0.80 | 0.040 | 0.040 | 1.00 | 1.50 | 0.65 |
Mechenical Properties
GRADE | TENSILE STRENGTH MIN （Mpa） | YIELD STRENGTH MIN （Mpa） | ELONGATION MIN | REDUCTION OF AREA MIN | HARDNESS |
ASTM A182 F11 CLASS1 | 415 | 205 | 20 | 45 | 121-174 |
ASTM A182 F11 CLASS2 | 485 | 275 | 20 | 30 | 143-207 |
ASTM A182 F11 CLASS3 | 515 | 310 | 20 | 30 | 156-207 |
Alloy steel blind flange have strong corrosion resistance, high temperature resistance, excellent sealing performance, and rigid and elastic requirements, and are widely used in various industrial fields.
Alloy Steel Blind Flange Testing
We off profession testing for our every client,also ensure that all our materials go through strict quality tests before dispatching them to our clients as below:
• Mechanical Testing Such as Tensile of Area
• Hardness Test
• Chemical Analysis – Spectro Analysis
• Positive Material Identification – PMI Testing
• Micro and Micro Test
Class 150 Blind Flange Dimensions & Weight Chart
| NPS | A | C | G | H | I | J | W |
| inch | inch | inch | No. of holes | inch | inch | kg/pc | |
| mm | mm | mm | mm | mm | |||
| 1/2 | 3.5 | 0.44 | 1.38 | 4 | 0.62 | 2.38 | 0.42 |
| 88.9 | 11.2 | 35.1 | 15.7 | 60.45 | |||
| 3/4 | 3.88 | 0.5 | 1.69 | 4 | 0.62 | 2.75 | 0.61 |
| 98.6 | 12.7 | 42.9 | 15.7 | 69.85 | |||
| 1 | 4.25 | 0.56 | 2 | 4 | 0.62 | 3.12 | 0.86 |
| 108 | 14.2 | 50.8 | 15.7 | 79.25 | |||
| 1-1/4 | 4.62 | 0.62 | 2.5 | 4 | 0.62 | 3.5 | 1.17 |
| 117.3 | 15.7 | 63.5 | 15.7 | 88.9 | |||
| 1-1/2 | 5 | 0.69 | 2.88 | 4 | 0.62 | 3.88 | 1.53 |
| 127 | 17.5 | 73.15 | 15.7 | 98.6 | |||
| 2 | 6 | 0.75 | 3.62 | 4 | 0.75 | 4.75 | 2.42 |
| 152.4 | 19.1 | 91.9 | 19.1 | 120.7 | |||
| 2-1/2 | 7 | 0.88 | 4.12 | 4 | 0.75 | 5.5 | 3.94 |
| 177.8 | 22.4 | 104.6 | 19.1 | 139.7 | |||
| 3 | 7.5 | 0.94 | 5 | 4 | 0.75 | 6 | 4.93 |
| 190.5 | 23.9 | 127 | 19.1 | 152.4 | |||
| 3-1/2 | 8.5 | 0.94 | 5.5 | 8 | 0.75 | 7 | 6.17 |
| 215.9 | 23.9 | 139.7 | 19.1 | 177.8 | |||
| 4 | 9 | 0.94 | 6.19 | 8 | 0.75 | 7.5 | 7 |
| 228.6 | 23.9 | 157.2 | 19.1 | 190.5 | |||
| 5 | 10 | 0.94 | 7.31 | 8 | 0.88 | 8.5 | 8.63 |
| 254 | 23.9 | 185.7 | 22.4 | 215.9 | |||
| 6 | 11 | 1 | 8.5 | 8 | 0.88 | 9.5 | 11.3 |
| 279.4 | 25.4 | 215.9 | 22.4 | 241.3 | |||
| 8 | 13.5 | 1.12 | 10.62 | 8 | 0.88 | 11.75 | 19.6 |
| 342.9 | 28.4 | 269.7 | 22.4 | 298.5 | |||
| 10 | 16 | 1.19 | 12.75 | 12 | 1 | 14.25 | 28.8 |
| 406.4 | 30.2 | 323.9 | 25.4 | 362 | |||
| 12 | 19 | 1.25 | 15 | 12 | 1 | 17 | 43.2 |
| 482.6 | 31.75 | 381 | 25.4 | 431.8 | |||
| 14 | 21 | 1.38 | 16.25 | 12 | 1.12 | 18.75 | 58.1 |
| 533.4 | 35.1 | 412.8 | 28.4 | 476.3 | |||
| 16 | 23.5 | 1.44 | 18.5 | 16 | 1.12 | 21.25 | 76 |
| 596.9 | 36.6 | 469.9 | 28.4 | 539.8 | |||
| 18 | 25 | 1.56 | 21 | 16 | 1.25 | 22.75 | 93.7 |
| 635 | 39.6 | 533.4 | 31.75 | 577.9 | |||
| 20 | 27.5 | 1.69 | 23 | 20 | 1.25 | 25 | 122 |
| 698.5 | 42.9 | 584.2 | 31.75 | 635 | |||
| 24 | 32 | 1.88 | 27.25 | 20 | 1.38 | 29.5 | 185 |
| 812.8 | 47.8 | 692.2 | 35.1 | 749.3 |
Notes:
1) Weights are based on manufacturer's data and are approximate.
2) Flat face flanges may be provided at full thickness, C, or with raised face removed (the latter is nonstandard).
3) If you need class 300 ,600 ,900 ,1500 ,2500 flanges,please contact us.
