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Dimensions of Class 150 Blanks for Use With Raised Face Flanges
The dimensions of Class 150 blanks for use with raised face (RF) flanges are standardized under the ASME B16.48 standard. These blanks, including spectacle blinds, spades, and spacers, are designed to fit raised face flanges in piping systems, ensuring proper sealing and isolation when required. Below are the dimensions commonly associated with Class 150 blanks for raised face flanges:
Dimensions of Class 150 Blanks for Use With Raised Face Flanges
| NPS | Inside Diameter,B,mm(in.) | Outside Diameter,O,mm(in.) | Centerline Dimension,A,mm(in.) | Thickness,t,mm(in.) | Web Width,W,mm(in.) |
| ½ | 16 (0.62) | 45 (1.75) | 60 (2.38) | 3.0 (0.12) | 38 (1.50) |
| ¾ | 21 (0.82) | 54 (2.12) | 70 (2.75) | 3.0 (0.12) | 38 (1.50) |
| 1 | 27 (1.05) | 64 (2.50) | 80 (3.12) | 3.0 (0.12) | 38 (1.50) |
| 1¼ | 42 (1.66) | 73 (2.88) | 90 (3.50) | 6.4 (0.25) | 38 (1.50) |
| 1½ | 48 (1.90) | 83 (3.25) | 100 (3.88) | 6.4 (0.25) | 38 (1.50) |
| 2 | 61 (2.38) | 102 (4.00) | 120 (4.75) | 6.4 (0.25) | 51 (2.00) |
| 2½ | 73 (2.88) | 121 (4.75) | 140 (5.50) | 6.4 (0.25) | 51 (2.00) |
| 3 | 89 (3.50) | 133 (5.25) | 150 (6.00) | 6.4 (0.25) | 64 (2.50) |
| 3½ | 102 (4.00) | 159 (6.25) | 175 (7.00) | 9.7 (0.38) | 64 (2.50) |
| 4 | 114 (4.50) | 171 (6.75) | 190 (7.50) | 9.7 (0.38) | 64 (2.50) |
| 5 | 141 (5.56) | 194 (7.62) | 215 (8.50) | 9.7 (0.38) | 76 (3.00) |
| 6 | 168 (6.62) | 219 (8.62) | 240 (9.50) | 12.7 (0.50) | 76 (3.00) |
| 8 | 219 (8.62) | 276 (10.88) | 300 (11.75) | 12.7 (0.50) | 76 (3.00) |
| 10 | 273 (10.75) | 337 (13.25) | 360 (14.25) | 15.7 (0.62) | 102 (4.00) |
| 12 | 324 (12.75) | 406 (16.00) | 430 (17.00) | 19.1 (0.75) | 102 (4.00) |
| 14 | 356 (14.00) | 448 (17.62) | 475 (18.75) | 19.1 (0.75) | 108 (4.25) |
| 16 | 406 (16.00) | 511 (20.12) | 540 (21.25) | 22.4 (0.88) | 108 (4.25) |
| 18 | 457 (18.00) | 546 (21.50) | 580 (22.75) | 25.4 (1.00) | 114 (4.50) |
| 20 | 508 (20.00) | 603 (23.75) | 635 (25.00) | 28.4 (1.12) | 121 (4.75) |
| 24 | 610 (24.00) | 714 (28.12) | 750 (29.50) | 31.8 (1.25) | 140 (5.50) |
NOTES:
(1)Hole size(where required due to bolt spacing)shall be the same as the flange bolt hole and located such that it will not interfere with bolting
between two flanges.
(2)Optional raised face.Refer to para.4.3.1.
(3)The thickness of the web (or tie bar)dimension,Wt shall be as determined by para.4.1.
Haihao Group can provide a variety ASME B16.48 standard flange,as follows:
- Dimensions of Class 150 Blanks for Use With Raised Face Flanges
- Dimensions of Class 300 Blanks for Use With Raised Face Flanges
- Dimensions of Class 600 Blanks for Use With Raised Face Flanges
- Dimensions of Class 900 Blanks for Use With Raised Face Flanges
- Dimensions of Class 1500 Blanks for Use With Raised Face Flanges
- Dimensions of Class 2500 Blanks for Use With Raised Face Flanges
- Dimensions of Class 150 Female Ring-Joint Facing Figure-8 Blanks
- Dimensions of Class 300 Female Ring-Joint Facing Figure-8 Blanks
- Dimensions of Class 600 Female Ring-Joint Facing Figure-8 Blanks
- Dimensions of Class 900 Female Ring-Joint Facing Figure-8 Blanks
- Dimensions of Class 1500 Female Ring-Joint Facing Figure-8 Blanks
- Dimensions of Class 2500 Female Ring-Joint Facing Figure-8 Blanks
- Dimensions of Class 150 Male Ring-Joint Facing Figure-8 Blanks
- Dimensions of Class 300 Male Ring-Joint Facing Figure-8 Blanks
- Dimensions of Class 600 Male Ring-Joint Facing Figure-8 Blanks
- Dimensions of Class 900 Male Ring-Joint Facing Figure-8 Blanks
- Dimensions of Class 1500 Male Ring-Joint Facing Figure-8 Blanks
- Dimensions of Class 2500 Male Ring-Joint Facing Figure-8 Blanks
Key Considerations
1.Material Selection: The material must be compatible with the flange material and capable of withstanding the pipeline’s pressure, temperature, and medium. Common materials include carbon steel, stainless steel, and alloys.
2.Raised Face Compatibility: The raised face diameter ensures proper gasket sealing and flange compatibility.
3.Thickness: The thickness of blanks is based on the flange rating and application. Proper thickness ensures adequate strength for pressure containment.
4.Marking and Certification: Blanks should include markings for material type, pressure rating, and size, and be certified to meet ASME standards.
5.Inspection and Testing:
- Dimensional checks: Ensure compatibility with flange specifications.
- Non-destructive testing (NDT): Detect internal defects.
- Material testing: Verify chemical and mechanical properties.
Applications
Class 150 blanks are ideal for:
- Isolating pipeline sections during maintenance or repairs.
- Blocking flow in high-pressure systems for safety.
- Allowing full flow during system operation with spacers.
For detailed project requirements or precise dimensions for a specific application, it’s recommended to consult the ASME B16.48 standard or contact professional supplier like Haihao Group. Email:sales@haihaogroup.com