1/2 in (15 mm) Blind Flange, ANSI B16.5 Class 300 | P3FB15
Available
This AAP blind flange is made from carbon steel to ANSI B16.5 Class 300 (manufacturer-stated). It is supplied in 12 sizes from 1/2 in (15 mm) to 12 in (300 mm).
A blind flange has no centre bore. It closes off the end of a pipe run, a valve port or a vessel nozzle, and can be unbolted when you need access for inspection, cleaning or pressure testing. AAP describes forged steel flanges as commonly specified in the oil, gas, petrochemical and mining sectors, where pressure, temperature and safety considerations are higher. They are hot forged and then machined.
AAP's temperature and pressure table for ASTM A105 flanges lists a maximum working pressure of 5,110 kPa (51.1 bar) for Class 300 from -29 to 38 °C, falling to 2,880 kPa (28.8 bar) at 425 °C. AAP notes that A105 forgings are not recommended for prolonged use above 427 °C.
Where this product is used
- Closing off spare pipe ends, valve ports and vessel nozzles
- Isolating a line so it can be pressure tested
- Pipework that has to be opened for inspection or cleaning
- Oil, gas, petrochemical and mining pipework
Features
- 12 sizes from 1/2 in (15 mm) to 12 in (300 mm)
- Made to ANSI B16.5 Class 300 (manufacturer-stated)
- Material: carbon steel (AAP quotes ratings for ASTM A105 forgings)
- Raised face, 1.6 mm raised face height
- Maximum working pressure 5,110 kPa (51.1 bar) up to 38 °C, per the manufacturer
- No centre bore, so it closes off the pipe end
- Marked where possible with heat number, size, table, grade and dimensional standard
Key specifications
| Specification | Detail |
|---|---|
| Brand | AAP |
| Flange type | Blind flange |
| Standard (manufacturer-stated) | ANSI B16.5 Class 300 |
| Material | Carbon steel (AAP quotes ratings for ASTM A105 forgings) |
| Face | Raised face, 1.6 mm raised face height |
| Connection | Blind, no centre bore |
| Sizes | 1/2 in (15 mm) to 12 in (300 mm) (12 sizes) |
| Maximum working pressure | 5,110 kPa (51.1 bar) at -29 to 38 °C |
| Marking | Where possible: heat number, size, table, grade and dimensional standard |
Options and part numbers
| Size | Part number | OD (mm) | PCD (mm) | Holes | Bolt size | Thickness (mm) | Weight (kg) |
|---|---|---|---|---|---|---|---|
| 1/2 in (15 mm) | P3FB15 | 95.3 | 66.6 | 4 x 16 mm | 1/2 in | 14.3 | 0.9 |
| 3/4 in (20 mm) | P3FB20 | 117.5 | 82.5 | 4 x 20 mm | 5/8 in | 15.9 | 1.4 |
| 1 in (25 mm) | P3FB25 | 123.9 | 88.9 | 4 x 20 mm | 5/8 in | 17.5 | 1.4 |
| 1-1/4 in (32 mm) | P3FB32 | 133.4 | 98.4 | 4 x 20 mm | 5/8 in | 19.1 | 1.8 |
| 1-1/2 in (40 mm) | P3FB40 | 155.6 | 114.3 | 4 x 22 mm | 3/4 in | 20.7 | 2.7 |
| 2 in (50 mm) | P3FB50 | 165.2 | 127 | 8 x 20 mm | 5/8 in | 22.3 | 3.6 |
| 3 in (80 mm) | P3FB80 | 209.6 | 168.2 | 8 x 22 mm | 3/4 in | 28.6 | 7.3 |
| 4 in (100 mm) | P3FB94 | 254.1 | 200 | 8 x 22 mm | 3/4 in | 31.8 | 12.5 |
| 6 in (150 mm) | P3FB96 | 317.6 | 269.8 | 12 x 22 mm | 3/4 in | 36.5 | 22.7 |
| 8 in (200 mm) | P3FB98 | 381 | 330.2 | 12 x 26 mm | 7/8 in | 41.1 | 36.8 |
| 10 in (250 mm) | P3FBX25 | 444.5 | 387.35 | 16 x 28 mm | 1 in | 47.75 | 56.8 |
| 12 in (300 mm) | P3FBX30 | 520.7 | 450.85 | 16 x 32 mm | 1-1/8 in | 50.8 | 84 |
Selecting the right option
Choose the blind flange that matches the standard, table or class and size of the flange it closes. Match the standard and table or class to the mating flange and compare the drilling dimensions listed on this page, because flanges made to different standards are not interchangeable. Gaskets and bolting are not part of this listing. If you are not sure what suits, contact AIMS with the standard and size of the mating flange.
Related products
See also AAP Slip-On Weld Flange, ANSI B16.5 Class 300, AAP Weld Neck Flange, ANSI B16.5 Class 300, AAP Screwed Flange NPT, ANSI B16.5 Class 300, AAP Blind Flange, ANSI B16.5 Class 150 and AAP Blind Flange, ANSI B16.5 Class 600.
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1/2"
Model Number: P3FB15
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1"
Model Number: P3FB25
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1-1/4"
Model Number: P3FB32
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1-1/2"
Model Number: P3FB40
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2"
Model Number: P3FB50
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3/4"
Model Number: P3FB20
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3"
Model Number: P3FB80
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4"
Model Number: P3FB94
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6"
Model Number: P3FB96
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8"
Model Number: P3FB98
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10"
Model Number: P3FBX25
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12"
Model Number: P3FBX30
