Weld Neck Flange Dimensions : Class 150 to Class 2500
Weld Neck Flange Dimensions: Class 150 to Class 2500
Weld neck flanges are widely used in high-pressure piping systems due to their strong and durable design. They are characterized by a long tapered hub that provides excellent stress distribution and resistance to bending. Weld neck flanges are available in various pressure classes, ranging from Class 150 to Class 2500, and their dimensions are standardized by ASME B16.5.
This article provides detailed dimension tables for weld neck flanges across different pressure classes, including diameter, thickness, bolt circle diameter, and number of bolts.
Table of Contents
- Weld Neck Flange Overview
- Dimension Tables for Weld Neck Flanges
- Class 150 Dimensions
- Class 300 Dimensions
- Class 600 Dimensions
- Class 900 Dimensions
- Class 1500 Dimensions
- Class 2500 Dimensions
- Key Notes on Dimensions
- Frequently Asked Questions (FAQ)
Weld Neck Flange Overview {#weld-neck-flange-overview}
Weld neck flanges are designed for high-pressure and high-temperature applications. They are welded directly to the pipe, ensuring a strong and leak-proof connection. The dimensions of weld neck flanges are standardized to ensure compatibility across different manufacturers and systems.
Key Features:
- Tapered Hub: Provides stress distribution and resistance to bending.
- Raised Face (RF): Common sealing surface for high-pressure applications.
- Available Pressure Classes: Class 150, 300, 600, 900, 1500, and 2500.
Dimension Tables for Weld Neck Flanges {#dimension-tables-for-weld-neck-flanges}
Below are the dimension tables for weld neck flanges according to ASME B16.5. Dimensions are in millimeters (mm).
Class 150 Dimensions {#class-150-dimensions}
| Nominal Pipe Size (NPS) | Outside Diameter (OD) | Bolt Circle Diameter (BCD) | Number of Bolts | Bolt Hole Diameter | Flange Thickness (T) | Hub Diameter (B) | Raised Face Height (RF) |
|---|---|---|---|---|---|---|---|
| 1/2 | 89 | 60.3 | 4 | 15.9 | 11.2 | 21.3 | 1.6 |
| 1 | 108 | 79.4 | 4 | 15.9 | 12.7 | 27.7 | 1.6 |
| 2 | 152 | 120.7 | 4 | 19.1 | 15.7 | 53.5 | 1.6 |
| 4 | 229 | 190.5 | 8 | 19.1 | 19.1 | 102.3 | 1.6 |
| 6 | 279 | 241.3 | 8 | 22.2 | 22.2 | 154.1 | 1.6 |
| 8 | 343 | 298.5 | 8 | 22.2 | 24.3 | 202.7 | 1.6 |
Class 300 Dimensions {#class-300-dimensions}
| Nominal Pipe Size (NPS) | Outside Diameter (OD) | Bolt Circle Diameter (BCD) | Number of Bolts | Bolt Hole Diameter | Flange Thickness (T) | Hub Diameter (B) | Raised Face Height (RF) |
|---|---|---|---|---|---|---|---|
| 1/2 | 95 | 66.7 | 4 | 15.9 | 14.3 | 21.3 | 2.0 |
| 1 | 117 | 82.6 | 4 | 15.9 | 16.7 | 27.7 | 2.0 |
| 2 | 165 | 127 | 8 | 19.1 | 20.7 | 53.5 | 2.0 |
| 4 | 254 | 190.5 | 8 | 22.2 | 24.3 | 102.3 | 2.0 |
| 6 | 318 | 261.9 | 12 | 22.2 | 28.6 | 154.1 | 2.0 |
| 8 | 381 | 333.4 | 12 | 25.4 | 31.8 | 202.7 | 2.0 |
Class 600 Dimensions {#class-600-dimensions}
| Nominal Pipe Size (NPS) | Outside Diameter (OD) | Bolt Circle Diameter (BCD) | Number of Bolts | Bolt Hole Diameter | Flange Thickness (T) | Hub Diameter (B) | Raised Face Height (RF) |
|---|---|---|---|---|---|---|---|
| 1/2 | 95 | 66.7 | 4 | 15.9 | 15.7 | 21.3 | 2.0 |
| 1 | 124 | 88.9 | 4 | 19.1 | 19.1 | 27.7 | 2.0 |
| 2 | 184 | 139.7 | 8 | 19.1 | 25.4 | 53.5 | 2.0 |
| 4 | 292 | 215.9 | 8 | 22.2 | 31.8 | 102.3 | 2.0 |
| 6 | 394 | 292.1 | 12 | 25.4 | 38.1 | 154.1 | 2.0 |
| 8 | 483 | 362.0 | 12 | 28.6 | 44.5 | 202.7 | 2.0 |
Class 900 Dimensions {#class-900-dimensions}
| Nominal Pipe Size (NPS) | Outside Diameter (OD) | Bolt Circle Diameter (BCD) | Number of Bolts | Bolt Hole Diameter | Flange Thickness (T) | Hub Diameter (B) | Raised Face Height (RF) |
|---|---|---|---|---|---|---|---|
| 1/2 | 108 | 69.9 | 4 | 15.9 | 22.2 | 21.3 | 2.0 |
| 1 | 133 | 95.3 | 4 | 19.1 | 25.4 | 27.7 | 2.0 |
| 2 | 197 | 152.4 | 8 | 22.2 | 31.8 | 53.5 | 2.0 |
| 4 | 318 | 241.3 | 8 | 25.4 | 41.3 | 102.3 | 2.0 |
| 6 | 419 | 317.5 | 12 | 28.6 | 50.8 | 154.1 | 2.0 |
| 8 | 521 | 393.7 | 12 | 31.8 | 57.2 | 202.7 | 2.0 |
Class 1500 Dimensions {#class-1500-dimensions}
| Nominal Pipe Size (NPS) | Outside Diameter (OD) | Bolt Circle Diameter (BCD) | Number of Bolts | Bolt Hole Diameter | Flange Thickness (T) | Hub Diameter (B) | Raised Face Height (RF) |
|---|---|---|---|---|---|---|---|
| 1/2 | 121 | 76.2 | 4 | 15.9 | 25.4 | 21.3 | 2.0 |
| 1 | 152 | 101.6 | 4 | 19.1 | 28.6 | 27.7 | 2.0 |
| 2 | 216 | 165.1 | 8 | 22.2 | 38.1 | 53.5 | 2.0 |
| 4 | 343 | 266.7 | 8 | 28.6 | 50.8 | 102.3 | 2.0 |
| 6 | 470 | 393.7 | 12 | 31.8 | 63.5 | 154.1 | 2.0 |
| 8 | 610 | 482.6 | 12 | 35.0 | 76.2 | 202.7 | 2.0 |
Class 2500 Dimensions {#class-2500-dimensions}
| Nominal Pipe Size (NPS) | Outside Diameter (OD) | Bolt Circle Diameter (BCD) | Number of Bolts | Bolt Hole Diameter | Flange Thickness (T) | Hub Diameter (B) | Raised Face Height (RF) |
|---|---|---|---|---|---|---|---|
| 1/2 | 133 | 82.6 | 4 | 15.9 | 28.6 | 21.3 | 2.0 |
| 1 | 165 | 114.3 | 4 | 19.1 | 31.8 | 27.7 | 2.0 |
| 2 | 267 | 190.5 | 8 | 25.4 | 47.8 | 53.5 | 2.0 |
| 4 | 406 | 317.5 | 8 | 31.8 | 63.5 | 102.3 | 2.0 |
| 6 | 559 | 482.6 | 12 | 35.0 | 82.6 | 154.1 | 2.0 |
| 8 | 711 | 571.5 | 12 | 41.3 | 101.6 | 202.7 | 2.0 |
Key Notes on Dimensions {#key-notes-on-dimensions}
- Raised Face (RF): The raised face height is typically 1.6 mm for Classes 150 and 300 and 2.0 mm for Classes 600 and above.
- Bolt Holes: The number and size of bolt holes increase with the flange pressure class to ensure a secure connection.
- Tapered Hub: The hub dimensions vary depending on the pipe size and pressure class to provide optimal stress distribution.
Frequently Asked Questions (FAQ) {#faq}
1. What is the purpose of a weld neck flange?
A weld neck flange is designed to provide a strong and leak-proof connection in high-pressure and high-temperature piping systems.
2. How are weld neck flange dimensions standardized?
Weld neck flange dimensions are standardized according to ASME B16.5, ensuring compatibility across different manufacturers.
3. What is the difference between Class 150 and Class 2500 flanges?
The main difference lies in their pressure-handling capacity. Class 150 flanges are suitable for low-pressure applications, while Class 2500 flanges are designed for extremely high-pressure systems.
4. Can weld neck flanges be used in corrosive environments?
Yes, weld neck flanges can be made from materials such as stainless steel, duplex steel, or nickel alloys to resist corrosion in harsh environments.
5. How do I select the right flange class for my application?
The flange class is selected based on the operating pressure, temperature, and material compatibility of the piping system.
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