ANSI / ASME B16.5 Class 400 Weld Neck Flange Dimensions
B16.5 400# Weld Neck Flange is a type of weld neck flange that conforms to the ASME B16.5 standard
ANSI / ASME B16.5 Class 400 Weld Neck Flange
Class 400 Weld Neck Flange Dimensions in Inch/lbs
Class 400 Weld Neck Flange Dimensions in mm/kg
Class 400 Weld Neck Flange Dimensions in Inch/lbs
| Nominal Pipe Size | Outside Diameter (Q) | Thickness (T) | Raised Face Diameter (R) | Length Thru Hub (Y) | Hub Diameter (X) | Bore (B) | Approximate Weight (lbs) | Bolt Circle (C) | Number of Holes | Diameter of Holes |
| 1/2 | 3.75 | 0.56 | 1.38 | 2.06 | 1.50 | Specified by purchaser | 2 | 2.63 | 4 | 0.63 |
| 3/4 | 4.63 | 0.63 | 1.69 | 2.25 | 1.88 | 4 | 3.25 | 4 | 0.75 | |
| 1 | 4.88 | 0.69 | 2.00 | 2.44 | 2.13 | 4 | 3.50 | 4 | 0.75 | |
| 1 1/4 | 5.25 | 0.81 | 2.50 | 2.63 | 2.50 | 6 | 3.88 | 4 | 0.75 | |
| 1 1/2 | 6.13 | 0.88 | 2.88 | 2.75 | 2.75 | 8 | 4.50 | 4 | 0.88 | |
| 2 | 6.50 | 1.00 | 3.63 | 2.88 | 3.31 | 12 | 5.00 | 8 | 0.75 | |
| 2 1/2 | 7.50 | 1.13 | 4.13 | 3.13 | 3.94 | 18 | 5.88 | 8 | 0.88 | |
| 3 | 8.25 | 1.25 | 5.00 | 3.25 | 4.63 | 23 | 6.63 | 8 | 0.88 | |
| 3 1/2 | 9.00 | 1.38 | 5.50 | 3.38 | 5.25 | 26 | 7.25 | 8 | 1.00 | |
| 4 | 10.00 | 1.38 | 6.19 | 3.50 | 5.75 | 35 | 7.88 | 8 | 1.00 | |
| 5 | 11.00 | 1.50 | 7.31 | 4.00 | 7.00 | 43 | 9.25 | 8 | 1.00 | |
| 6 | 12.50 | 1.63 | 8.50 | 4.06 | 8.13 | 57 | 10.63 | 12 | 1.00 | |
| 8 | 15.00 | 1.88 | 10.63 | 4.63 | 10.25 | 89 | 13.00 | 12 | 1.13 | |
| 10 | 17.50 | 2.13 | 12.75 | 4.88 | 12.63 | 125 | 15.25 | 16 | 1.25 | |
| 12 | 20.50 | 2.25 | 15.00 | 5.38 | 14.75 | 175 | 17.75 | 16 | 1.38 | |
| 14 | 23.00 | 2.38 | 16.25 | 5.88 | 16.75 | 230 | 20.25 | 20 | 1.38 | |
| 16 | 25.50 | 2.50 | 18.50 | 6.00 | 19.00 | 295 | 22.50 | 20 | 1.50 | |
| 18 | 28.00 | 2.63 | 21.00 | 6.50 | 21.00 | 350 | 24.75 | 24 | 1.50 | |
| 20 | 30.50 | 2.75 | 23.00 | 6.63 | 23.13 | 425 | 27.00 | 24 | 1.63 | |
| 22 | 33.00 | 2.88 | 25.25 | 6.75 | 25.25 | 505 | 29.25 | 24 | 1.75 | |
| 24 | 36.00 | 3.00 | 27.25 | 6.88 | 27.63 | 620 | 32.00 | 24 | 1.88 |
Class 400 Weld Neck Flange Dimensions in mm/kg
| Nominal Pipe Size | Outside Diameter (Q) | Thickness (T) | Raised Face Diameter (R) | Length Thru Hub (Y) | Hub Diameter (X) | Bore (B) | Approximate Weight (kg) | Bolt Circle (C) | Number of Holes | Diameter of Holes |
| 1/2 | 95.3 | 14.2 | 35.1 | 52.3 | 38.1 | Specified by purchaser | 0.9 | 66.8 | 4 | 16.0 |
| 3/4 | 117.6 | 16.0 | 42.9 | 57.2 | 47.8 | 1.8 | 82.6 | 4 | 19.1 | |
| 1 | 124.0 | 17.5 | 50.8 | 62.0 | 54.1 | 1.8 | 88.9 | 4 | 19.1 | |
| 1 1/4 | 133.4 | 20.6 | 63.5 | 66.8 | 63.5 | 2.7 | 98.6 | 4 | 19.1 | |
| 1 1/2 | 155.7 | 22.4 | 73.2 | 69.9 | 69.9 | 3.6 | 114.3 | 4 | 22.4 | |
| 2 | 165.1 | 25.4 | 92.2 | 73.2 | 84.1 | 5.4 | 127.0 | 8 | 19.1 | |
| 2 1/2 | 190.5 | 28.7 | 104.9 | 79.5 | 100.1 | 8.2 | 149.4 | 8 | 22.4 | |
| 3 | 209.6 | 31.8 | 127.0 | 82.6 | 117.6 | 10.4 | 168.4 | 8 | 22.4 | |
| 3 1/2 | 228.6 | 35.1 | 139.7 | 85.9 | 133.4 | 11.8 | 184.2 | 8 | 25.4 | |
| 4 | 254.0 | 35.1 | 157.2 | 88.9 | 146.1 | 15.9 | 200.2 | 8 | 25.4 | |
| 5 | 279.4 | 38.1 | 185.7 | 101.6 | 177.8 | 19.5 | 235.0 | 8 | 25.4 | |
| 6 | 317.5 | 41.4 | 215.9 | 103.1 | 206.5 | 25.9 | 270.0 | 12 | 25.4 | |
| 8 | 381.0 | 47.8 | 270.0 | 117.6 | 260.4 | 40.4 | 330.2 | 12 | 28.7 | |
| 10 | 444.5 | 54.1 | 323.9 | 124.0 | 320.8 | 56.7 | 387.4 | 16 | 31.8 | |
| 12 | 520.7 | 57.2 | 381.0 | 136.7 | 374.7 | 79.4 | 450.9 | 16 | 35.1 | |
| 14 | 584.2 | 60.5 | 412.8 | 149.4 | 425.5 | 104.3 | 514.4 | 20 | 35.1 | |
| 16 | 647.7 | 63.5 | 469.9 | 152.4 | 482.6 | 133.8 | 571.5 | 20 | 38.1 | |
| 18 | 711.2 | 66.8 | 533.4 | 165.1 | 533.4 | 158.8 | 628.7 | 24 | 38.1 | |
| 20 | 774.7 | 69.9 | 584.2 | 168.4 | 587.5 | 192.8 | 685.8 | 24 | 41.4 | |
| 22 | 838.2 | 73.2 | 641.4 | 171.5 | 641.4 | 229.1 | 743.0 | 24 | 44.5 | |
| 24 | 914.4 | 76.2 | 692.2 | 174.8 | 701.8 | 281.2 | 812.8 | 24 | 47.8 |
Features of ASME B16.5 400# Weld Neck Flange
- Standard: Complies with the ANSI/ASME B16.5 standard, suitable for connecting piping and fittings.
- Pressure Rating: Class 400, indicating a maximum allowable working pressure of 400 psi (pounds per square inch) at specific temperatures.
- Type: Weld Neck Flange, featuring a long neck design for easy welding to the pipe, providing better strength and sealing performance.
- Material: Common materials include carbon steel (e.g., ASTM A105), stainless steel (e.g., ASTM A182 F304/F316), and alloy steel (e.g., ASTM A182 F11/F22).
- Size Range: Covers pipe sizes from 1/2 inch to 24 inches.
- Facing Types: Common facing types include:
- Raised Face (RF): Suitable for most high-pressure applications.
- Ring-Type Joint (RTJ): Suitable for extremely high-pressure applications.
- Bolt Holes: Standardized number and diameter of bolt holes to ensure compatibility with other flanges.
- Application Environment: Suitable for high-pressure, high-temperature, or high-strength applications, such as in the oil and gas, chemical, power generation, and shipbuilding industries.
Applications of ASME B16.5 400# Weld Neck Flange
- Oil and Gas: Used in high-pressure and high-temperature piping systems.
- Chemical Industry: Suitable for transporting corrosive media.
- Power Generation: Used in high-pressure steam and cooling water systems in power plants.
- Shipbuilding: Utilized in ship piping systems.
- Water Treatment: Applied in high-pressure water treatment and transportation systems.
The ANSI/ASME B16.5 Class 400 Weld Neck Flange is a high-strength, high-sealing-performance flange suitable for extremely high-pressure and high-temperature piping systems. By understanding its features and common questions, you can better select, install, and maintain this type of flange to ensure the safe operation of piping systems.
For more technical support, please contact SSM.
FAQ
- Class 400 indicates that the flange has a maximum allowable working pressure of 400 psi at specific temperatures. As the temperature increases, the maximum allowable working pressure decreases.
- A Weld Neck Flange is connected to the pipe through welding, offering higher strength and sealing performance, making it suitable for high-pressure, high-temperature, or vibration-prone applications. Slip-On Flanges are used for low-pressure applications, while Blind Flanges are used to seal the ends of pipes.
- Select based on application requirements:
- Raised Face (RF): Suitable for most high-pressure applications.
- Ring-Type Joint (RTJ): Suitable for extremely high-pressure applications.
- Material selection affects the flange’s corrosion resistance, strength, and temperature range. For example:
- Carbon steel is suitable for general applications.
- Stainless steel is suitable for corrosive media.
- Alloy steel is suitable for high-temperature and high-pressure environments.
- Class 400 flanges are designed for higher pressure and are suitable for higher-pressure applications, while Class 300 flanges are used for medium-pressure environments.
- They are widely used in industries such as oil and gas, chemical, power generation, shipbuilding, and water treatment, especially in applications requiring high pressure and high temperature.
EN 
DE 
RU 
FA 
ID