Expander Flange
 | An expander flange, sometimes referred to as an expanding flange or flange expander, is a mechanical component used to connect pipes or tubes of varying diameters. It allows for a smooth transition between different pipe sizes, ensuring a proper and secure fit.
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Here’s a brief overview of how it works and why it’s used:
Purpose: Expander flanges are designed to connect pipes or tubes of different sizes, accommodating changes in diameter without causing flow restrictions or leaks. They are commonly used in industries where pipes of varying sizes need to be joined, such as in plumbing, HVAC systems, and various industrial processes.
Design: An expander flange typically has a tapered or conical shape that gradually increases in diameter. This design helps to ensure a smooth transition between the smaller and larger pipe sections.
Installation: To install an expander flange, it is usually bolted or welded to the ends of the pipes or tubes being connected. The flanges are then aligned and fastened together to create a secure joint.
Materials: Expander flanges can be made from various materials, including steel, stainless steel, and other alloys, depending on the application and the type of fluid or gas being transported.
Applications: These flanges are used in a variety of applications where pipes of different sizes need to be joined, such as in water supply systems, oil and gas pipelines, and ventilation systems.
If you have specific details or a particular application in mind, let me know, and I can provide more tailored information!
Expander Flange Class 150 Dimensions
| Pipe Size (NPS) | Outside Diameter of Flange A | Diameter of Raised Face B | Thickness of Flange C | Diameter of Bore D | Diameter of Bore D2 | Diameter of Hub at Weld H | Diameter of Hub at Base J | Length of Hub K | Compound Taper CT | Slope at Bevel SB | Number of Bolt Holes | Diameter of Bolt Holes | Bolt Circle Diameter P | Approx. Weight (lb) | Design Type |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 2 x 3 | 6 | 3 5/8 | 3/4 | 2.067 | 3.068 | 3.500 | 3 1/16 | 2 1/2 | – | 16° | 4 | 3/4 | 4 3/4 | 6 | A |
| 2 x 4 | 6 | 3 5/8 | 3/4 | 2.067 | 4.026 | 4.500 | 3 1/16 | 3 5/8 | 1/2 | 29° * | 4 | 3/4 | 4 3/4 | 6 | C |
| 3 x 4 | 7 1/2 | 5 | 15/16 | 3.068 | 4.026 | 4.500 | 4 1/4 | 2 3/4 | – | 15° | 4 | 3/4 | 6 | 11 | A |
| 4 x 6 | 9 | 6 3/16 | 15/16 | 4.026 | 6.065 | 6.625 | 5 5/16 | 3 1/4 | 1/2 | 30° * | 8 | 3/4 | 7 1/2 | 15 | C |
| 6 x 8 | 11 | 8 1/2 | 1 | 6.065 | 7.981 | 8.625 | 7 9/16 | 4 | 1/2 | 28° * | 8 | 7/8 | 9 1/2 | 24 | C |
| 8 x 10 | 13 1/2 | 10 5/8 | 1 1/8 | 7.981 | 10.020 | 10.750 | 9 11/16 | 4 | 1/2 | 29° * | 8 | 7/8 | 11 3/4 | 39 | C |
| 8 x 12 | 13 1/2 | 10 5/8 | 1 1/8 | 7.981 | 12.000 | 12.750 | 9 11/16 | 6 | 1/2 | 29° * | 8 | 7/8 | 11 3/4 | 39 | C |
| 10 x 12 | 16 | 12 3/4 | 1 3/16 | 10.020 | 12.000 | 12.750 | 12 | 3 15/16 | 1/2 | 39° * | 12 | 1 | 14 1/4 | 52 | C |
| 10 x 14 | 16 | 12 3/4 | 1 3/16 | 10.020 | 13.250 | 14.000 | 12 | 5 7/16 | 5/8 | 30° * | 12 | 1 | 14 1/4 | 52 | C |
| 12 x 14 | 19 | 15 | 1 1/4 | 12.000 | 13.250 | 14.000 | 14 3/8 | 4 1/2 | – | 11° | 12 | 1 | 17 | 80 | D |
| 12 x 16 | 19 | 15 | 1 1/4 | 12.000 | 15.250 | 16.000 | 14 3/8 | 4 13/16 | 5/8 | 30° * | 12 | 1 | 17 | 80 | C |
| 14 x 16 | 21 | 16 1/4 | 1 3/8 | 13.250 | 15.250 | 16.000 | 15 3/4 | 5 | – | 15° | 12 | 1 1/8 | 18 3/4 | 120 | A |
| 14 x 18 | 21 | 16 1/4 | 1 3/8 | 13.250 | 17.250 | 18.000 | 15 3/4 | 5 11/16 | 5/8 | 30° * | 12 | 1 1/8 | 18 3/4 | 120 | C |
| 18 x 20 | 25 | 21 | 1 9/16 | 17.250 | 19.250 | 20.000 | 19 7/8 | 5 1/2 | – | 14° | 16 | 1 1/4 | 22 3/4 | 140 | A |
| 18 x 24 | 25 | 21 | 1 9/16 | 17.250 | 23.250 | 24.000 | 19 7/8 | 8 13/16 | 5/8 | 28° * | 16 | 1 1/4 | 22 3/4 | 140 | C |
| 20 x 24 | 27 1/2 | 23 | 1 11/16 | 19.250 | 23.250 | 24.000 | 22 | 6 7/16 | 5/8 | 30° * | 20 | 1 1/4 | 25 | 170 | C |
| 24 x 30 | 32 | 27 1/4 | 1 7/8 | 23.250 | 29.250 | 30.000 | 26 1/8 | 8 11/16 | 3/4 | 30° * | 20 | 1 3/8 | 29 1/2 | 260 | C |
Expander Flange Class 300 Dimensions
| Pipe Size (NPS) | Outside Diameter of Flange A | Diameter of Raised Face B | Thickness of Flange C | Diameter of Bore D | Diameter of Bore D2 | Diameter of Hub at Weld H | Diameter of Hub at Base J | Length of Hub K | Compound Taper CT | Slope at Bevel SB | Number of Bolt Holes | Diameter of Bolt Holes | Bolt Circle Diameter P | Approx. Weight (lb) | Design Type |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 2 x 3 | 6 1/2 | 3 5/8 | 7/8 | 2.067 | 3.068 | 2.375 | 3 5/16 | 2 3/4 | – | 15° | 8 | 3/4 | 5 | 9 | A |
| 2 x 4 | 6 1/2 | 3 5/8 | 7/8 | 2.067 | 4.026 | 2.375 | 3 5/16 | 2 3/4 | 1/2 | 29° * | 8 | 3/4 | 5 | 9 | C |
| 3 x 4 | 8 1/4 | 5 | 1 1/8 | 3.068 | 4.026 | 3.500 | 4 5/8 | 3 1/8 | – | 13° | 8 | 7/8 | 6 5/8 | 15 | D |
| 4 x 6 | 10 | 6 3/16 | 1 1/4 | 4.026 | 6.065 | 4.500 | 5 3/4 | 3 3/8 | 1/2 | 30° * | 8 | 7/8 | 7 7/8 | 25 | C |
| 6 x 8 | 12 1/2 | 8 1/2 | 1 7/16 | 6.065 | 7.981 | 6.625 | 8 1/8 | 3 7/8 | 1/2 | 22° * | 12 | 7/8 | 10 5/8 | 42 | B |
| 8 x 10 | 15 | 10 5/8 | 1 5/8 | 7.981 | 10.020 | 8.625 | 10 1/4 | 4 3/8 | – | 20° | 12 | 1 | 13 | 67 | A |
| 10 x 12 | 17 1/2 | 12 3/4 | 1 7/8 | 10.020 | 12.000 | 10.750 | 12 5/8 | 4 5/8 | – | 20° | 16 | 1 1/8 | 15 1/4 | 91 | A |
| 12 x 14 | 20 1/2 | 15 | 2 | 12.000 | 13.250 | 12.750 | 14 3/4 | 5 1/8 | – | 11° | 16 | 1 1/4 | 17 3/4 | 138 | D |
| 14 x 16 | 23 | 16 1/4 | 2 1/8 | 13.250 | 15.250 | 14.000 | 16 3/4 | 5 5/8 | – | 16° | 20 | 1 1/4 | 20 1/4 | 186 | D |
| 16 x 18 | 25 1/2 | 18 1/2 | 2 1/4 | 15.250 | 17.250 | 16.000 | 19 | 5 3/4 | – | 16° | 20 | 1 3/8 | 22 1/2 | 246 | D |
| 18 x 20 | 28 | 21 | 2 3/8 | 17.250 | 19.250 | 18.000 | 21 | 6 1/4 | – | 14° | 24 | 1 3/8 | 24 3/4 | 305 | D |
| 20 x 24 | 30 1/2 | 23 | 2 1/2 | 19.250 | 23.250 | 20.000 | 23 1/8 | 6 3/8 | 5/8 | 29° * | 24 | 1 3/8 | 27 | 378 | B |
| 24 x 30 | 36 | 27 1/4 | 2 3/4 | 23.250 | 29.250 | 24.000 | 27 5/8 | 6 5/8 | 3/4 | 30° * | 24 | 1 5/8 | 32 | 545 | B |
Expander Flange Class 400 Dimensions
| Pipe Size (NPS) | Outside Diameter of Flange A | Diameter of Raised Face B | Thickness of Flange C | Diameter of Bore D | Diameter of Bore D2 | Diameter of Hub at Weld H | Diameter of Hub at Base J | Length of Hub K | Compound Taper CT | Slope at Bevel SB | Number of Bolt Holes | Diameter of Bolt Holes | Bolt Circle Diameter P | Approx. Weight (lb) | Design Type |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 2 x 3 | 6 1/2 | 3 5/8 | 1 | * | * | 2.375 | 3 5/16 | 2 7/8 | – | 14° | 8 | 3/4 | 5 | 12 | A |
| 2 x 4 | 6 1/2 | 3 5/8 | 1 | * | * | 2.375 | 3 5/16 | 2 7/8 | 1/2 | 29° ** | 8 | 3/4 | 5 | 12 | C |
| 3 x 4 | 8 1/4 | 5 | 1 1/4 | * | * | 3.500 | 4 5/8 | 3 1/4 | – | 13° | 8 | 7/8 | 6 5/8 | 23 | D |
| 4 x 6 | 10 3/4 | 6 3/16 | 1 1/2 | * | * | 4.500 | 6 | 4 | – | 21° | 8 | 1 | 8 1/2 | 42 | A |
| 6 x 8 | 14 | 8 1/2 | 1 7/8 | * | * | 6.625 | 8 3/4 | 4 5/8 | – | 21° | 12 | 1 1/8 | 11 1/2 | 81 | D |
| 8 x 10 | 16 1/2 | 10 5/8 | 2 3/16 | * | * | 8.625 | 10 3/4 | 5 1/4 | – | 19° | 12 | 1 1/4 | 13 3/4 | 117 | D |
| 10 x 12 | 20 | 12 3/4 | 2 1/2 | * | * | 10.750 | 13 1/2 | 6 | – | 16° | 16 | 1 3/8 | 17 | 189 | D |
| 12 x 14 | 22 | 15 | 2 5/8 | * | * | 12.750 | 15 3/4 | 6 1/8 | – | 10° | 20 | 1 3/8 | 19 1/4 | 226 | D |
| 14 x 16 | 23 3/4 | 16 1/4 | 2 3/4 | * | * | 14.000 | 17 | 6 1/2 | – | 15° | 20 | 1 1/2 | 20 3/4 | 347 | D |
| 16 x 18 | 27 | 18 1/2 | 3 | * | * | 16.000 | 19 1/2 | 7 | – | 14° | 20 | 1 5/8 | 23 3/4 | 481 | D |
| 18 x 20 | 29 1/4 | 21 | 3 1/4 | * | * | 18.000 | 21 1/2 | 7 1/4 | – | 14° | 20 | 1 3/4 | 25 3/4 | 555 | D |
| 20 x 24 | 32 | 23 | 3 1/2 | * | * | 20.00 | 24 | 7 1/2 | 5/8 | 28° ** | 24 | 1 3/4 | 28 1/2 | 690 | E |
| 24 x 30 | 37 | 27 1/4 | 4 | * | * | 24.00 | 28 1/4 | 8 | 3/4 | 28° ** | 24 | 2 | 33 | 977 | C |
- Dimensions per ASME B16.5 – Pipe Flanges and Flanged Fittings: NPS 1/2 through NPS 24 Metric/Inch Standard
- Bolt circle diameters are 1/8 inch larger than bolt diameter
- * To be specified by purchaser.
- ** The slope at the welding bevel approximates 1:3 maximum size. The flange bore has a compound angle of 18° through dimension “CT” and the remaining taper as indicated.