ANSI B16.5 Class 300 Flanges | Blind
ANSI B16.5 Class 300 Blind Flanges are commonly used to close the ports of pipes or equipment, capable of withstanding a pressure of 300 pounds-force per square inch (PSIG) in the ANSI (American National Standards Institute) standard. Blind flanges are designed without a central hole or opening., It can be installed on the pipeline port and tightly connected to the pipeline flange using fasteners to achieve isolation or sealing.
YANHAO ANSI B16.5 blind flanges are made of stainless steel, carbon steel, and alloy steel, and can be galvanized after heat treatment according to application requirements. We also provide additional components such as gasket flanges, bolts, nuts, flange covers, or flange cover gaskets. We usually offer standard flanges; if you need to order special types of flanges, please get in touch with our experts.
ANSI B16.5 Class 300(blind) dimensions
| Nominal Pipe Size | Outside Diameter (O) | Bolt Circle (W) | Raised Face Diameter (R) | Number of Holes | Diameter of Holes | Thickness (T) | Approximate Weight (lbs) |
|---|---|---|---|---|---|---|---|
| 1/2 | 3.75 | 2.62 | 1.38 | 4 | 0.63 | 0.50 | 2 |
| 3/4 | 4.62 | 3.25 | 1.69 | 4 | 0.75 | 0.56 | 3 |
| 1 | 4.88 | 3.50 | 2.00 | 4 | 0.75 | 0.62 | 3 |
| 1 1/4 | 5.25 | 3.88 | 2.50 | 4 | 0.75 | 0.69 | 4 |
| 1 1/2 | 6.12 | 4.50 | 2.88 | 4 | 0.88 | 0.75 | 6 |
| 2 | 6.50 | 5.00 | 3.62 | 8 | 0.75 | 0.81 | 8 |
| 2 1/2 | 7.50 | 5.88 | 4.12 | 8 | 0.88 | 0.94 | 12 |
| 3 | 8.25 | 6.62 | 5.00 | 8 | 0.88 | 1.06 | 16 |
| 3 1/2 | 9.00 | 7.25 | 5.50 | 8 | 0.88 | 1.12 | 21 |
| 4 | 10.00 | 7.88 | 6.19 | 8 | 0.88 | 1.19 | 27 |
| 5 | 11.00 | 9.25 | 7.31 | 8 | 0.88 | 1.31 | 35 |
| 6 | 12.50 | 10.62 | 8.50 | 12 | 0.88 | 1.38 | 50 |
| 8 | 15.00 | 13.00 | 10.62 | 12 | 1.00 | 1.56 | 81 |
| 10 | 17.50 | 15.25 | 12.75 | 16 | 1.13 | 1.81 | 124 |
| 12 | 20.50 | 17.75 | 15.00 | 16 | 1.25 | 1.94 | 185 |
| 14 | 23.00 | 20.25 | 16.25 | 20 | 1.25 | 2.06 | 250 |
| 16 | 25.50 | 22.50 | 18.50 | 20 | 1.38 | 2.19 | 295 |
| 18 | 28.00 | 24.75 | 21.00 | 24 | 1.38 | 2.31 | 395 |
| 20 | 30.50 | 27.00 | 23.00 | 24 | 1.38 | 2.44 | 505 |
| 22 | 33.00 | 29.25 | 25.25 | 24 | 1.63 | 2.56 | 640 |
| 24 | 36.00 | 32.00 | 27.25 | 24 | 1.63 | 2.69 | 790 |
Blind Flange
Blind Flanges are flanges without a central hole and are also commonly known as Blank Flanges or Flange Covers. The primary function of blind flanges is to isolate pipelines or close off equipment ports. They are typically used in industry for pipeline blocking, segmental sealing of pipelines, preventing intermixing of media, leaks.
