ANSI / ASME B16.5 Class 900 Blind Flange Dimensions
The ANSI/ASME B16.5 Class 900 Blind Flange is a type of blind flange that complies with the ANSI/ASME B16.5 standard and is suitable for Class 900 pressure ratings.
ANSI / ASME B16.5 Class 900 Blind Flange
Class 900 Blind Flange Dimensions in Inch/lbs
Class 900 Blind Flange Dimensions in mm/kg
Class 900 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 | 4.75 | 0.88 | 1.38 | 4 | 3.25 | 4 | 0.88 |
| 3/4 | 5.13 | 1.00 | 1.69 | 6 | 3.50 | 4 | 0.88 |
| 1 | 5.88 | 1.13 | 2.00 | 8 | 4.00 | 4 | 1.00 |
| 1 1/4 | 6.25 | 1.13 | 2.50 | 9 | 4.38 | 4 | 1.00 |
| 1 1/2 | 7.00 | 1.25 | 2.88 | 13 | 4.88 | 4 | 1.13 |
| 2 | 8.50 | 1.50 | 3.63 | 25 | 6.50 | 8 | 1.00 |
| 2 1/2 | 9.63 | 1.63 | 4.13 | 35 | 7.50 | 8 | 1.13 |
| 3 | 9.50 | 1.50 | 5.00 | 29 | 7.50 | 8 | 1.00 |
| 4 | 11.50 | 1.75 | 6.19 | 54 | 9.25 | 8 | 1.25 |
| 5 | 13.75 | 2.00 | 7.31 | 87 | 11.00 | 8 | 1.38 |
| 6 | 15.00 | 2.19 | 8.50 | 115 | 12.50 | 12 | 1.25 |
| 8 | 18.50 | 2.50 | 10.63 | 200 | 15.50 | 12 | 1.50 |
| 10 | 21.50 | 2.75 | 12.75 | 290 | 18.50 | 16 | 1.50 |
| 12 | 24.00 | 3.13 | 15.00 | 415 | 21.00 | 20 | 1.50 |
| 14 | 25.25 | 3.38 | 16.25 | 520 | 22.00 | 20 | 1.63 |
| 16 | 27.75 | 3.50 | 18.50 | 600 | 24.25 | 20 | 1.75 |
| 18 | 31.00 | 4.00 | 21.00 | 850 | 27.00 | 20 | 2.00 |
| 20 | 33.75 | 4.25 | 23.00 | 1075 | 29.50 | 20 | 2.13 |
| 24 | 41.00 | 5.50 | 27.25 | 2025 | 35.50 | 20 | 2.63 |
Class 900 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 | 120.65 | 22.35 | 35.05 | 1.81 | 82.55 | 4 | 22.35 |
| 3/4 | 130.30 | 25.40 | 42.93 | 2.72 | 88.90 | 4 | 22.35 |
| 1 | 149.35 | 28.70 | 50.80 | 3.63 | 101.60 | 4 | 25.40 |
| 1 1/4 | 158.75 | 28.70 | 63.50 | 4.08 | 111.25 | 4 | 25.40 |
| 1 1/2 | 177.80 | 31.75 | 73.15 | 5.90 | 123.95 | 4 | 28.70 |
| 2 | 215.90 | 38.10 | 92.20 | 11.34 | 165.10 | 8 | 25.40 |
| 2 1/2 | 244.60 | 41.40 | 104.90 | 15.88 | 190.50 | 8 | 28.70 |
| 3 | 241.30 | 38.10 | 127.00 | 13.15 | 190.50 | 8 | 25.40 |
| 4 | 292.10 | 44.45 | 157.23 | 24.49 | 234.95 | 8 | 31.75 |
| 5 | 349.25 | 50.80 | 185.67 | 39.46 | 279.40 | 8 | 35.05 |
| 6 | 381.00 | 55.63 | 215.90 | 52.16 | 317.50 | 12 | 31.75 |
| 8 | 469.90 | 63.50 | 270.00 | 90.72 | 393.70 | 12 | 38.10 |
| 10 | 546.10 | 69.85 | 323.85 | 131.54 | 469.90 | 16 | 38.10 |
| 12 | 609.60 | 79.50 | 381.00 | 188.24 | 533.40 | 20 | 38.10 |
| 14 | 641.35 | 85.85 | 412.75 | 235.87 | 558.80 | 20 | 41.40 |
| 16 | 704.85 | 88.90 | 469.90 | 272.16 | 615.95 | 20 | 44.45 |
| 18 | 787.40 | 101.60 | 533.40 | 385.55 | 685.80 | 20 | 50.80 |
| 20 | 857.25 | 107.95 | 584.20 | 487.61 | 749.30 | 20 | 54.10 |
| 24 | 1041.40 | 139.70 | 692.15 | 918.52 | 901.70 | 20 | 66.80 |
Applications of Class 900 Blind Flanges
Class 900 Blind Flanges are commonly used in:
- High-pressure piping systems in industries such as oil and gas, chemical, and petrochemical.
- Closing off pipelines during testing or maintenance.
- Applications requiring isolation for inspection or repair.
- Pressure vessels and storage tanks to block openings.
Commonly Used for Class 900 Blind Flanges
- Carbon Steel (ASTM A105, ASTM A350 LF2)
- Stainless Steel (ASTM A182 F304/F316)
- Nickel Alloys (Inconel, Hastelloy)
- Duplex and Super Duplex Stainless Steels
An ANSI / ASME B16.5 Class 900 Blind Flange is a high-pressure rated flange (Class 900) with no center opening, designed to seal off or block the end of a piping system, valve, or vessel. It conforms to the ANSI / ASME B16.5 standard, which governs pipe flanges and flange fittings for pressure and temperature ratings.
For more technical support, please contact SSM.
FAQ
- Class 900 indicates that the flange can withstand a maximum pressure of 900 psi at a reference temperature, usually around 100°F. The pressure capacity decreases at higher temperatures, so it’s crucial to refer to ASME tables for temperature-pressure ratings.
- A blind flange lacks a bore and is used to block the flow in a piping system, while other types of flanges like slip-on, weld neck, and socket weld flanges have openings that allow fluid to pass through.
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