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| ASME B16.5 Superior Weld Neck Flange
Weld neck flange is characterized by butt-welding process, the flange and the pipeline are closely combined, and can withstand high temperature and high pressure and high frequency vibration and other harsh environmental conditions under the use of the requirements; at the same time, the necking butt-welding flange also has a compact structure, easy to install and other characteristics, and it has been widely used in the fields of chemical industry, petroleum, pharmaceuticals and other fields.
Weld neck flange requires high material quality, strength and pressure resistance, and has good sealing performance and stability. It is suitable for connecting pipelines that require high pressure and high temperature conditions. Weld neck flanges are mainly used in harsh working conditions, such as pipelines with thermal expansion or other loads that cause the flanges to be subjected to high stress or repeated stress changes, pipelines with large fluctuations in pressure and temperature, or pipelines with high temperatures, high pressures and sub-zero low temperatures. Weld neck flanges are usually made of carbon steel, stainless steel, duplex steel, alloy steel and other materials, which are widely used in various industries due to their high quality, low cost and good performance.
| Advantage
1. Pipeline Safety Connection
Weld neck flange, also called WN flange. It's a type of pipeline connector commonly used to connect two pipelines used for conveying liquid or gas, ensuring the normal flow of liquid or gas.
2. Security Assurance
The use of neck welded flanges to connect pipelines can improve the safety and stability of the pipeline and reduce the risk of leakage in the pipeline system.
3. High Pressure Adaption
The neck welded flange can withstand high temperature and high pressure, and is suitable for various high temperature and high pressure working environments to ensure the normal operation of the pipeline system. The high stiffness and ductility of carbon steel as well as the corrosion resistance of stainless steel make it suitable for complex engineering project.
4. Easy Maintenance
The pipeline system connected with neck welded flanges facilitates maintenance and replacement of pipeline components, reducing the cost and time of maintenance and replacement of components.
| Size
| Weld Neck Flange Class 150 lb Dimension | |||||||||||
| NPS | A | B | C | D | E | F | G | H |  I | J | W |
| inch | inch | inch | inch | inch | inch | inch | No. of Holes | inch | inch | kg/pc | |
| mm | mm | mm | mm | mm | mm | mm | mm | mm | |||
| 1/2 | 3.5 | 0.62 | 0.44 | 1.88 | 0.84 | 1.19 | 1.38 | 4 | 0.62 | 2.38 | 0.48 |
| 88.9 | 15.7 | 11.2 | 47.8 | 21.3 | 30.2 | 35 | 15.7 | 60.45 | |||
| 3/4 | 3.88 | 0.82 | 0.5 | 2.06 | 1.05 | 1.5 | 1.69 | 4 | 0.62 | 2.75 | 0.71 |
| 98.6 | 20.8 | 12.7 | 52.3 | 26.7 | 38.1 | 42.9 | 15.7 | 69.85 | |||
| 1 | 4.25 | 1.05 | 0.56 | 2.19 | 1.32 | 1.94 | 2 | 4 | 0.62 | 3.12 | 1.01 |
| 108 | 26.7 | 14.2 | 55.6 | 33.5 | 49.3 | 50.8 | 15.7 | 79.25 | |||
| 1 1/4 | 4.62 | 1.38 | 0.62 | 2.25 | 1.66 | 2.31 | 2.55 | 4 | 0.62 | 3.5 | 1.33 |
| 117.3 | 35.1 | 15.7 | 57.15 | 42.2 | 58.7 | 63.5 | 15.7 | 88.9 | |||
| 1 1/2 | 5 | 1.61 | 0.69 | 2.44 | 1.9 | 2.56 | 2.88 | 4 | 0.62 | 3.88 | 1.72 |
| 127 | 40.9 | 17.5 | 62 | 48.3 | 65 | 73.15 | 15.7 | 98.6 | |||
| 2 | 6 | 2.07 | 0.75 | 2.5 | 2.38 | 3.06 | 3.62 | 4 | 0.75 | 4.75 | 2.58 |
| 152.4 | 52.6 | 19.1 | 63.5 | 60.45 | 77.7 | 91.9 | 19.1 | 120.7 | |||
| 2 1/2 | 7 | 2.47 | 0.88 | 2.75 | 2.88 | 3.56 | 4.12 | 4 | 0.75 | 5.5 | 4.11 |
| 177.8 | 62.7 | 22.4 | 69.85 | 73.15 | 90.4 | 104.6 | 19.1 | 139.7 | |||
| 3 | 7.5 | 3.07 | 0.94 | 2.75 | 3.5 | 4.25 | 5 | 4 | 0.75 | 6 | 4.92 |
| 190.5 | 78 | 23.9 | 69.85 | 88.9 | 108 | 127 | 19.1 | 152.4 | |||
| 3 1/2 | 8.5 | 3.55 | 0.94 | 2.81 | 4 | 4.81 | 5.5 | 8 | 0.75 | 7 | 6.08 |
| 215.9 | 90.2 | 23.9 | 71.4 | 101.6 | 122.2 | 139.7 | 19.1 | 177.8 | |||
| 4 | 9 | 4.03 | 0.94 | 3 | 4.5 | 5.31 | 6.19 | 8 | 0.75 | 7.5 | 6.84 |
| 228.6 | 102.4 | 23.9 | 76.2 | 114.3 | 134.9 | 157.2 | 19.1 | 190.5 | |||
| 5 | 10 | 5.05 | 0.94 | 3.5 | 5.56 | 6.44 | 7.31 | 8 | 0.88 | 8.5 | 8.56 |
| 254 | 128.3 | 23.9 | 88.9 | 141.2 | 163.6 | 185.7 | 22.4 | 215.9 | |||
| 6 | 11 | 6.07 | 1 | 3.5 | 6.63 | 7.56 | 8.5 | 8 | 0.88 | 9.5 | 10.6 |
| 279.4 | 154.2 | 25.4 | 88.9 | 168.4 | 192 | 215.9 | 22.4 | 241.3 | |||
| 8 | 13.5 | 7.98 | 1.12 | 4 | 8.63 | 9.69 | 10.62 | 8 | 0.88 | 11.75 | 17.6 |
| 342.9 | 202.7 | 28.4 | 101.6 | 219.2 | 246.1 | 269.7 | 22.4 | 298.5 | |||
| 10 | 16 | 10.02 | 1.19 | 4 | 10.75 | 12 | 12.75 | 12 | 1 | 14.25 | 24 |
| 406.4 | 254.5 | 30.2 | 101.6 | 273 | 304.8 | 323.8 | 25.4 | 362 | |||
| 12 | 19 | 12 | 1.25 | 4.5 | 12.75 | 14.38 | 15 | 12 | 1 | 17 | 36.5 |
| 482.6 | 304.8 | 31.75 | 114.3 | 323.8 | 365.3 | 381 | 25.4 | 431.8 | |||
| 14 | 21 | 1.38 | 5 | 14 | 15.75 | 16.25 | 12 | 1.12 | 18.75 | 48.4 | |
| 533.4 | 35.1 | 127 | 355.6 | 400.1 | 412.7 | 28.4 | 476.3 | ||||
| 16 | 23.5 | 1.44 | 5 | 16 | 18 | 18.5 | 16 | 1.12 | 21.25 | 60.6 | |
| 596.9 | 36.6 | 127 | 406.4 | 475.2 | 469.9 | 28.4 | 539.8 | ||||
| 18 | 25 | 1.56 | 5.5 | 18 | 19.88 | 21 | 16 | 1.25 | 22.75 | 68.3 | |
| 635 | 39.6 | 139.7 | 457.2 | 505 | 533.4 | 31.75 | 577.9 | ||||
| 20 | 27.5 | 1.69 | 5.69 | 20 | 22 | 23 | 20 | 1.25 | 25 | 84.5 | |
| 698.5 | 42.9 | 144.5 | 508 | 558.8 | 584.2 | 31.75 | 635 | ||||
| 24 | 32 | 1.88 | 6 | 24 | 26.12 | 27.25 | 20 | 1.38 | 29.5 | 115 | |
| 812.8 | 47.8 | 152.4 | 609.6 | 663.4 | 692.1 | 35.1 | 749.3 | ||||
| Flange parameter table
| ASME B16.5 Superior Weld Neck Flange
Weld neck flange is characterized by butt-welding process, the flange and the pipeline are closely combined, and can withstand high temperature and high pressure and high frequency vibration and other harsh environmental conditions under the use of the requirements; at the same time, the necking butt-welding flange also has a compact structure, easy to install and other characteristics, and it has been widely used in the fields of chemical industry, petroleum, pharmaceuticals and other fields.
Weld neck flange requires high material quality, strength and pressure resistance, and has good sealing performance and stability. It is suitable for connecting pipelines that require high pressure and high temperature conditions. Weld neck flanges are mainly used in harsh working conditions, such as pipelines with thermal expansion or other loads that cause the flanges to be subjected to high stress or repeated stress changes, pipelines with large fluctuations in pressure and temperature, or pipelines with high temperatures, high pressures and sub-zero low temperatures. Weld neck flanges are usually made of carbon steel, stainless steel, duplex steel, alloy steel and other materials, which are widely used in various industries due to their high quality, low cost and good performance.
| Advantage
1. Pipeline Safety Connection
Weld neck flange, also called WN flange. It's a type of pipeline connector commonly used to connect two pipelines used for conveying liquid or gas, ensuring the normal flow of liquid or gas.
2. Security Assurance
The use of neck welded flanges to connect pipelines can improve the safety and stability of the pipeline and reduce the risk of leakage in the pipeline system.
3. High Pressure Adaption
The neck welded flange can withstand high temperature and high pressure, and is suitable for various high temperature and high pressure working environments to ensure the normal operation of the pipeline system. The high stiffness and ductility of carbon steel as well as the corrosion resistance of stainless steel make it suitable for complex engineering project.
4. Easy Maintenance
The pipeline system connected with neck welded flanges facilitates maintenance and replacement of pipeline components, reducing the cost and time of maintenance and replacement of components.
| Size
| Weld Neck Flange Class 150 lb Dimension | |||||||||||
| NPS | A | B | C | D | E | F | G | H | I | J | W |
| inch | inch | inch | inch | inch | inch | inch | No. of Holes | inch | inch | kg/pc | |
| mm | mm | mm | mm | mm | mm | mm | mm | mm | |||
| 1/2 | 3.5 | 0.62 | 0.44 | 1.88 | 0.84 | 1.19 | 1.38 | 4 | 0.62 | 2.38 | 0.48 |
| 88.9 | 15.7 | 11.2 | 47.8 | 21.3 | 30.2 | 35 | 15.7 | 60.45 | |||
| 3/4 | 3.88 | 0.82 | 0.5 | 2.06 | 1.05 | 1.5 | 1.69 | 4 | 0.62 | 2.75 | 0.71 |
| 98.6 | 20.8 | 12.7 | 52.3 | 26.7 | 38.1 | 42.9 | 15.7 | 69.85 | |||
| 1 | 4.25 | 1.05 | 0.56 | 2.19 | 1.32 | 1.94 | 2 | 4 | 0.62 | 3.12 | 1.01 |
| 108 | 26.7 | 14.2 | 55.6 | 33.5 | 49.3 | 50.8 | 15.7 | 79.25 | |||
| 1 1/4 | 4.62 | 1.38 | 0.62 | 2.25 | 1.66 | 2.31 | 2.55 | 4 | 0.62 | 3.5 | 1.33 |
| 117.3 | 35.1 | 15.7 | 57.15 | 42.2 | 58.7 | 63.5 | 15.7 | 88.9 | |||
| 1 1/2 | 5 | 1.61 | 0.69 | 2.44 | 1.9 | 2.56 | 2.88 | 4 | 0.62 | 3.88 | 1.72 |
| 127 | 40.9 | 17.5 | 62 | 48.3 | 65 | 73.15 | 15.7 | 98.6 | |||
| 2 | 6 | 2.07 | 0.75 | 2.5 | 2.38 | 3.06 | 3.62 | 4 | 0.75 | 4.75 | 2.58 |
| 152.4 | 52.6 | 19.1 | 63.5 | 60.45 | 77.7 | 91.9 | 19.1 | 120.7 | |||
| 2 1/2 | 7 | 2.47 | 0.88 | 2.75 | 2.88 | 3.56 | 4.12 | 4 | 0.75 | 5.5 | 4.11 |
| 177.8 | 62.7 | 22.4 | 69.85 | 73.15 | 90.4 | 104.6 | 19.1 | 139.7 | |||
| 3 | 7.5 | 3.07 | 0.94 | 2.75 | 3.5 | 4.25 | 5 | 4 | 0.75 | 6 | 4.92 |
| 190.5 | 78 | 23.9 | 69.85 | 88.9 | 108 | 127 | 19.1 | 152.4 | |||
| 3 1/2 | 8.5 | 3.55 | 0.94 | 2.81 | 4 | 4.81 | 5.5 | 8 | 0.75 | 7 | 6.08 |
| 215.9 | 90.2 | 23.9 | 71.4 | 101.6 | 122.2 | 139.7 | 19.1 | 177.8 | |||
| 4 | 9 | 4.03 | 0.94 | 3 | 4.5 | 5.31 | 6.19 | 8 | 0.75 | 7.5 | 6.84 |
| 228.6 | 102.4 | 23.9 | 76.2 | 114.3 | 134.9 | 157.2 | 19.1 | 190.5 | |||
| 5 | 10 | 5.05 | 0.94 | 3.5 | 5.56 | 6.44 | 7.31 | 8 | 0.88 | 8.5 | 8.56 |
| 254 | 128.3 | 23.9 | 88.9 | 141.2 | 163.6 | 185.7 | 22.4 | 215.9 | |||
| 6 | 11 | 6.07 | 1 | 3.5 | 6.63 | 7.56 | 8.5 | 8 | 0.88 | 9.5 | 10.6 |
| 279.4 | 154.2 | 25.4 | 88.9 | 168.4 | 192 | 215.9 | 22.4 | 241.3 | |||
| 8 | 13.5 | 7.98 | 1.12 | 4 | 8.63 | 9.69 | 10.62 | 8 | 0.88 | 11.75 | 17.6 |
| 342.9 | 202.7 | 28.4 | 101.6 | 219.2 | 246.1 | 269.7 | 22.4 | 298.5 | |||
| 10 | 16 | 10.02 | 1.19 | 4 | 10.75 | 12 | 12.75 | 12 | 1 | 14.25 | 24 |
| 406.4 | 254.5 | 30.2 | 101.6 | 273 | 304.8 | 323.8 | 25.4 | 362 | |||
| 12 | 19 | 12 | 1.25 | 4.5 | 12.75 | 14.38 | 15 | 12 | 1 | 17 | 36.5 |
| 482.6 | 304.8 | 31.75 | 114.3 | 323.8 | 365.3 | 381 | 25.4 | 431.8 | |||
| 14 | 21 | 1.38 | 5 | 14 | 15.75 | 16.25 | 12 | 1.12 | 18.75 | 48.4 | |
| 533.4 | 35.1 | 127 | 355.6 | 400.1 | 412.7 | 28.4 | 476.3 | ||||
| 16 | 23.5 | 1.44 | 5 | 16 | 18 | 18.5 | 16 | 1.12 | 21.25 | 60.6 | |
| 596.9 | 36.6 | 127 | 406.4 | 475.2 | 469.9 | 28.4 | 539.8 | ||||
| 18 | 25 | 1.56 | 5.5 | 18 | 19.88 | 21 | 16 | 1.25 | 22.75 | 68.3 | |
| 635 | 39.6 | 139.7 | 457.2 | 505 | 533.4 | 31.75 | 577.9 | ||||
| 20 | 27.5 | 1.69 | 5.69 | 20 | 22 | 23 | 20 | 1.25 | 25 | 84.5 | |
| 698.5 | 42.9 | 144.5 | 508 | 558.8 | 584.2 | 31.75 | 635 | ||||
| 24 | 32 | 1.88 | 6 | 24 | 26.12 | 27.25 | 20 | 1.38 | 29.5 | 115 | |
| 812.8 | 47.8 | 152.4 | 609.6 | 663.4 | 692.1 | 35.1 | 749.3 | ||||
| Flange parameter table
