ANSI / ASME B16.5 Class 300 Blind Flange Dimensions
The ANSI/ASME B16.5 Class 300 Blind Flange is a type of blind flange that complies with the ANSI/ASME B16.5 standard and is suitable for Class 300 pressure ratings.
ANSI / ASME B16.5 Class 300 Blind Flange
Class 300 Blind Flange Dimensions in Inch/lbs
Class 300 Blind Flange Dimensions in mm/kg
Class 300 Blind Flange Dimensions in Inch/lbs
| Nominal Pipe Size | Outside Diameter(O) | Thickness (T) | Raised Face Diameter(R) | Approximate Weight (lbs) | Bolt Circle (C) | Number of Holes | Diameter of Holes |
| 1/2 | 3.75 | 0.56 | 1.38 | 2 | 2.63 | 4 | 0.63 |
| 3/4 | 4.63 | 0.63 | 1.69 | 3 | 3.25 | 4 | 0.75 |
| 1 | 4.88 | 0.69 | 2.00 | 3 | 3.50 | 4 | 0.75 |
| 1 1/4 | 5.25 | 0.75 | 2.50 | 4 | 3.88 | 4 | 0.75 |
| 1 1/2 | 6.13 | 0.81 | 2.88 | 6 | 4.50 | 4 | 0.88 |
| 2 | 6.50 | 0.88 | 3.63 | 8 | 5.00 | 8 | 0.75 |
| 2 1/2 | 7.50 | 1.00 | 4.13 | 12 | 5.88 | 8 | 0.88 |
| 3 | 8.25 | 1.13 | 5.00 | 16 | 6.63 | 8 | 0.88 |
| 3 1/2 | 9.00 | 1.19 | 5.50 | 21 | 7.25 | 8 | 0.88 |
| 4 | 10.00 | 1.25 | 6.19 | 27 | 7.88 | 8 | 0.88 |
| 5 | 11.00 | 1.38 | 7.31 | 35 | 9.25 | 8 | 0.88 |
| 6 | 12.50 | 1.44 | 8.50 | 50 | 10.63 | 12 | 0.88 |
| 8 | 15.00 | 1.63 | 10.63 | 81 | 13.00 | 12 | 1.00 |
| 10 | 17.50 | 1.88 | 12.75 | 124 | 15.25 | 16 | 1.13 |
| 12 | 20.50 | 2.00 | 15.00 | 185 | 17.75 | 16 | 1.25 |
| 14 | 23.00 | 2.13 | 16.25 | 250 | 20.25 | 20 | 1.25 |
| 16 | 25.50 | 2.25 | 18.50 | 295 | 22.50 | 20 | 1.38 |
| 18 | 28.00 | 2.38 | 21.00 | 395 | 24.75 | 24 | 1.38 |
| 20 | 30.50 | 2.50 | 23.00 | 505 | 27.00 | 24 | 1.38 |
| 22 | 33.00 | 2.63 | 25.25 | 640 | 29.25 | 24 | 1.63 |
| 24 | 36.00 | 2.75 | 27.25 | 790 | 32.00 | 24 | 1.63 |
Class 300 Blind Flange Dimensions in mm/kg
| Nominal Pipe Size | Outside Diameter(O) | Thickness (T) | Raised Face Diameter(R) | Approximate Weight (Kg) | Bolt Circle (C) | Number of Holes | Diameter of Holes |
| 1/2 | 95.25 | 14.22 | 35.05 | 0.91 | 66.80 | 4 | 16.00 |
| 3/4 | 117.60 | 16.00 | 42.93 | 1.36 | 82.55 | 4 | 19.05 |
| 1 | 123.95 | 17.53 | 50.80 | 1.36 | 88.90 | 4 | 19.05 |
| 1 1/4 | 133.35 | 19.05 | 63.50 | 1.81 | 98.55 | 4 | 19.05 |
| 1 1/2 | 155.70 | 20.57 | 73.15 | 2.72 | 114.30 | 4 | 22.35 |
| 2 | 165.10 | 22.35 | 92.20 | 3.63 | 127.00 | 8 | 19.05 |
| 2 1/2 | 190.50 | 25.40 | 104.90 | 5.44 | 149.35 | 8 | 22.35 |
| 3 | 209.55 | 28.70 | 127.00 | 7.26 | 168.40 | 8 | 22.35 |
| 3 1/2 | 228.60 | 30.23 | 139.70 | 9.53 | 184.15 | 8 | 22.35 |
| 4 | 254.00 | 31.75 | 157.23 | 12.25 | 200.15 | 8 | 22.35 |
| 5 | 279.40 | 35.05 | 185.67 | 15.88 | 234.95 | 8 | 22.35 |
| 6 | 317.50 | 36.58 | 215.90 | 22.68 | 270.00 | 12 | 22.35 |
| 8 | 381.00 | 41.40 | 270.00 | 36.74 | 330.20 | 12 | 25.40 |
| 10 | 444.50 | 47.75 | 323.85 | 56.25 | 387.35 | 16 | 28.70 |
| 12 | 520.70 | 50.80 | 381.00 | 83.91 | 450.85 | 16 | 31.75 |
| 14 | 584.20 | 54.10 | 412.75 | 113.40 | 514.35 | 20 | 31.75 |
| 16 | 647.70 | 57.15 | 469.90 | 133.81 | 571.50 | 20 | 35.05 |
| 18 | 711.20 | 60.45 | 533.40 | 179.17 | 628.65 | 24 | 35.05 |
| 20 | 774.70 | 63.50 | 584.20 | 229.06 | 685.80 | 24 | 35.05 |
| 22 | 838.20 | 66.80 | 641.35 | 290.30 | 742.95 | 24 | 41.40 |
| 24 | 914.40 | 69.85 | 692.15 | 358.34 | 812.80 | 24 | 41.40 |
The ANSI/ASME B16.5 Class 300 Blind Flange is a standard flange used to seal pipeline ends or equipment openings, offering advantages such as complete sealing, easy installation and removal, and high adaptability.
Features of ASME B16.5 300# Blind Flange
- Standard: Complies with ANSI/ASME B16.5.
- Pressure Rating: Class 300 (maximum working pressure of 300 psi at ambient temperature).
- Type: Blind Flange.
- Material: Carbon steel (e.g., ASTM A105), stainless steel (e.g., ASTM A182), alloy steel (e.g., ASTM A182 F11), etc.
- Facing Types: Raised face (RF), flat face (FF), ring-type joint (RTJ), etc.
- Size Range: Typically from 1/2″ to 24″.
Applications of ASME B16.5 300# Blind Flange
- Sealing Pipeline Ends: Used to seal temporarily unused pipeline ends.
- Equipment Isolation: Used to isolate equipment or pipeline systems for maintenance and inspection.
- Pressure Testing: Used for pressure testing of pipeline systems to ensure sealing.
- Preventing Media Leakage: Used to prevent media leakage or the entry of external contaminants into the system.
The ANSI/ASME B16.5 Class 300 Blind Flange is widely used in industries such as oil and gas, chemicals, and power to ensure system sealing and safety. Proper selection and use of blind flanges are key to ensuring the long-term stable operation of pipeline systems.
For more technical support, please contact SSM.
FAQ
- Installation considerations:
- Ensure the flange and pipeline or equipment connection surfaces are clean.
- Use appropriate gaskets and bolts, and tighten to the specified torque.
- Perform leak tests to ensure sealing.
- Selection criteria:
- Nominal pipe size (NPS) of the pipeline or equipment.
- System pressure rating and operating temperature.
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