• ARO-OPAFU-WN1
What is a Weld Neck Orifice Flange Union?
A Weld Neck Orifice Flange Union is a specialized type of flange used in piping systems to measure the flow rate of fluids. It consists of a weld neck flange and an orifice plate, designed to be welded to the pipe. The orifice plate has a precisely measured hole that creates a pressure drop, allowing for the calculation of flow rate based on differential pressure measurements. This type of union is commonly used in industrial applications where accurate flow measurement is critical, such as in chemical processing, oil and gas, and power generation industries.
Product Data
OVERVIEW
TECH-INFO
DIMENSIONAL DATA
APPLICATIONS
ADVANTAGES
OVERVIEW
The Weld Neck Orifice Flange Union is tailored for high pressure applications, featuring a long, tapered hub for a robust welded connection, ensuring precise bore alignment and reducing stress concentrations.
The Weld Neck Ori ce Flange Union (ARO-OPAFU-WN1) offers reliable performance in high-pressure and high temperature environments. Its secure and precise design ensures accurate flow measurements and robust sealing. With a range of materials and standards compliance, it meets diverse industrial requirements, providing comprehensive documentation for quality assurance.
Features
- High-Pressure Capability : Ideal for high-pressure and high temperature environments.
- Secure Welded Seal : Provides a strong, leak-proof connection.
- Accurate Measurement : Ensures minimal flow disturbance due to precise alignment.
TECH-INFO
Technical Information
| Model Number | ARO-OPAFU-WN1 |
|---|---|
| Material | SS 304/L, 316/L, Duplex, Super Duplex, Hastelloy, Carbon Steel, Monel, Inconel, Titanium |
| Orifice Plate Types | Square Edge, Eccentric, Conical Entrance, Quarter Circle |
| Pressure Classes | 150, 300, 600, 900, 1500, 2500 |
| Standards | ISO 5167-2, ASME MFC-3M, ISO TR 15377, AGA 3 ANSI B16.36, B31.3 |
DIMENSIONAL DATA
Class 150 Weld Neck Flange Dimension
| Size ( Inch) | OD ( mm ) | Flange Thickness (mm) | Hub OD | Weld Neck OD | RF Diameter (mm) | RF Height (mm) | PCD (mm) | No of BoIts | BoIt Size (UNC) |
|---|---|---|---|---|---|---|---|---|---|
| 1/2 | 90 | 9.6 | 30 | 21.3 | 34.9 | 2 | 60.3 | 4 | 1/2 |
| 3/4 | 100 | 11.2 | 38 | 26.7 | 42.9 | 2 | 69.9 | 4 | 1/2 |
| 1 | 110 | 12.7 | 49 | 33.4 | 50.8 | 2 | 79.4 | 4 | 1/2 |
| 1 1/4 | 115 | 14.3 | 59 | 42.2 | 63.5 | 2 | 88.9 | 4 | 1/2 |
| 1 1/2 | 125 | 15.9 | 65 | 48.2 | 73 | 2 | 98.4 | 4 | 1/2 |
| 2 | 150 | 17.5 | 78 | 60.3 | 92.1 | 2 | 120.7 | 4 | 5/8 |
| 2 1/2 | 180 | 20.7 | 90 | 73 | 104.8 | 2 | 139.7 | 4 | 5/8 |
| 3 | 190 | 22.3 | 108 | 88.9 | 127 | 2 | 152.4 | 4 | 5/8 |
| 3 1/2 | 215 | 22.3 | 122 | 101.6 | 139.7 | 2 | 177.8 | 8 | 5/8 |
| 4 | 230 | 22.3 | 135 | 114.3 | 157.2 | 2 | 190.5 | 8 | 5/8 |
| 5 | 255 | 22.3 | 164 | 141.3 | 185.7 | 2 | 215.9 | 8 | 3/4 |
| 6 | 280 | 23.9 | 192 | 168.3 | 215.9 | 2 | 241.3 | 8 | 3/4 |
| 8 | 345 | 27 | 246 | 219.1 | 269.9 | 2 | 298.5 | 8 | 3/4 |
| 10 | 405 | 28.6 | 305 | 273 | 323.8 | 2 | 362 | 12 | 7/8 |
| 12 | 485 | 30.2 | 365 | 323.8 | 381 | 2 | 431.8 | 12 | 7/8 |
| 14 | 535 | 33.4 | 400 | 355.6 | 412.8 | 2 | 476.3 | 12 | 1 |
| 16 | 595 | 35 | 457 | 406.4 | 469.9 | 2 | 539.8 | 16 | 1 |
| 18 | 635 | 38.1 | 505 | 457.2 | 533.4 | 2 | 577.9 | 16 | 1 1/8 |
| 20 | 700 | 41.3 | 559 | 508 | 584.2 | 2 | 635 | 20 | 1 1/8 |
| 24 | 815 | 41.3 | 559 | 508 | 584.2 | 2 | 635 | 20 | 1 1/8 |
Class 300 Weld Neck Flange Dimensions
| Size ( Inch) | OD ( mm ) | Flange Thickness (mm) | Hub OD | Weld Neck OD | RF Diameter (mm) | RF Height (mm) | PCD (mm) | No of BoIts | BoIt Size (UNC) |
|---|---|---|---|---|---|---|---|---|---|
| 1/2 | 95 | 12.7 | 38 | 21.3 | 34.9 | 2 | 66.7 | 4 | 1/2 |
| 3/4 | 115 | 14.3 | 48 | 26.7 | 42.9 | 2 | 82.6 | 4 | 5/8 |
| 1 | 125 | 15.9 | 54 | 33.4 | 50.8 | 2 | 88.9 | 4 | 5/8 |
| 1 1/4 | 135 | 17.5 | 64 | 42.2 | 63.5 | 2 | 98.4 | 4 | 5/8 |
| 1 1/2 | 155 | 19.1 | 70 | 48.2 | 73 | 2 | 114.3 | 4 | 3/4 |
| 2 | 165 | 20.7 | 84 | 60.3 | 92.1 | 2 | 127 | 8 | 5/8 |
| 2 1/2 | 190 | 23.9 | 100 | 73 | 104.8 | 2 | 149.2 | 8 | 3/4 |
| 3 | 210 | 27 | 117 | 88.9 | 127 | 2 | 168.3 | 8 | 3/4 |
| 3 1/2 | 230 | 28.6 | 133 | 101.6 | 139.7 | 2 | 184.2 | 8 | 3/4 |
| 4 | 255 | 30.2 | 146 | 114.3 | 157.2 | 2 | 200 | 8 | 3/4 |
| 5 | 280 | 33.4 | 178 | 141.3 | 185.7 | 2 | 235 | 8 | 3/8 |
| 6 | 320 | 35 | 206 | 168.3 | 215.9 | 2 | 269.9 | 12 | 3/8 |
| 8 | 380 | 39.7 | 260 | 219.1 | 269.9 | 2 | 330.2 | 12 | 7/8 |
| 10 | 445 | 46.1 | 321 | 273 | 323.8 | 2 | 387.4 | 16 | 1 |
| 12 | 520 | 49.3 | 375 | 323.8 | 381 | 2 | 450.8 | 16 | 1 1/8 |
| 16 | 650 | 55.6 | 483 | 406.4 | 469.9 | 2 | 571.5 | 20 | 1 1/4 |
| 18 | 710 | 58.8 | 533 | 457.2 | 533.4 | 2 | 628.6 | 24 | 1 1/4 |
| 20 | 775 | 62 | 587 | 508 | 584.2 | 2 | 685.8 | 24 | 1 1/4 |
| 20 | 775 | 62 | 587 | 508 | 584.2 | 2 | 685.8 | 24 | 1 1/4 |
| 24 | 915 | 68.3 | 702 | 610 | 692.2 | 2 | 812.8 | 24 | 1 1/2 |
Class 600 Weld Neck Flange Dimension
| Size ( Inch) | OD ( mm ) | Flange Thickness (mm) | Hub OD | Weld Neck OD | RF Diameter (mm) | RF Height (mm) | PCD (mm) | No of BoIts | BoIt Size (UNC) |
|---|---|---|---|---|---|---|---|---|---|
| 1/2 | 95 | 14.3 | 38 | 21.3 | 34.9 | 7 | 66.7 | 4 | 1/2 |
| 3/4 | 115 | 15.9 | 48 | 26.7 | 42.9 | 7 | 82.6 | 4 | 5/8 |
| 1 | 125 | 17.5 | 54 | 33.4 | 50.8 | 7 | 88.9 | 4 | 5/8 |
| 1 1/4 | 135 | 20.7 | 64 | 42.2 | 63.5 | 7 | 98.4 | 4 | 5/8 |
| 1 1/2 | 155 | 22.3 | 70 | 48.2 | 73 | 7 | 114.3 | 4 | 3/4 |
| 2 | 165 | 25.4 | 84 | 60.3 | 92.1 | 7 | 127 | 8 | 5/8 |
| 2 1/2 | 190 | 28.6 | 100 | 73 | 104.8 | 7 | 149.2 | 8 | 3/4 |
| 3 | 210 | 31.8 | 117 | 88.9 | 127 | 7 | 168.3 | 8 | 3/4 |
| 3 1/2 | 230 | 35 | 133 | 101.6 | 139.7 | 7 | 184.2 | 8 | 7/8 |
| 4 | 275 | 38.1 | 152 | 114.3 | 157.2 | 7 | 215.9 | 8 | 7/8 |
| 5 | 330 | 44.5 | 189 | 141.3 | 185.7 | 7 | 266.7 | 8 | 1 |
| 6 | 355 | 47.7 | 222 | 168.3 | 215.9 | 7 | 292.1 | 12 | 1 |
| 8 | 420 | 55.6 | 273 | 219.1 | 269.9 | 7 | 349.2 | 12 | 1 1/8 |
| 10 | 510 | 63.5 | 343 | 273 | 323.8 | 7 | 431.8 | 16 | 1 1/4 |
| 12 | 560 | 66.7 | 400 | 323.8 | 381 | 7 | 489 | 20/td> | 1 1/4 |
| 14 | 605 | 69.9 | 432 | 355.6 | 412.8 | 7 | 527 | 20 | 1 3/8 |
| 16 | 685 | 76.2 | 495 | 406.4 | 469.9 | 7 | 603.2 | 20 | 1 1/2 |
| 18 | 745 | 82.6 | 546 | 457.2 | 533.4 | 7 | 654 | 20 | 1 5/8 |
| 20 | 815 | 88.9 | 610 | 508 | 584.2 | 7 | 723.9 | 24 | 1 5/8 |
| 24 | 940 | 101.6 | 718 | 610 | 692.2 | 7 | 838.2 | 24 | 1 7/8 |
Class 900 Weld Neck Flange Dimension
| Size ( Inch) | OD ( mm ) | Flange Thickness (mm) | Hub OD | Weld Neck OD | RF Diameter (mm) | RF Height (mm) | PCD (mm) | No of BoIts | BoIt Size (UNC) |
|---|---|---|---|---|---|---|---|---|---|
| 1/2 | 120 | 22.3 | 38 | 21.3 | 34.9 | 7 | 82.6 | 4 | 3/4 |
| 3/4 | 130 | 25.4 | 44 | 26.7 | 42.9 | 7 | 88.9 | 4 | 3/4 |
| 1 | 150 | 28.6 | 52 | 33.4 | 50.8 | 7 | 101.6 | 4 | 7/8 |
| 1 1/4 | 160 | 28.6 | 64 | 42.2 | 63.5 | 7 | 111.1 | 4 | 7/8 |
| 1 1/2 | 180 | 31.8 | 70 | 48.2 | 73 | 7 | 123.8 | 4 | 1 |
| 2 | 215 | 38.1 | 105 | 60.3 | 92.1 | 7 | 165.1 | 8 | 7/8 |
| 2 1/2 | 245 | 41.3 | 124 | 73 | 104.8 | 7 | 190.5 | 8 | 1 |
| 3 | 240 | 38.1 | 127 | 88.9 | 127 | 7 | 190.5 | 8 | 7/8 |
| 4 | 290 | 44.5 | 159 | 114.3 | 157.2 | 7 | 235 | 8 | 1 1/8 |
| 5 | 350 | 50.8 | 190 | 141.3 | 185.7 | 7 | 279.4 | 8 | 1 1/4 |
| 6 | 380 | 55.6 | 235 | 168.3 | 215.9 | 7 | 317.5 | 12 | 1 1/8 |
| 8 | 470 | 63.5 | 298 | 219.1 | 269.9 | 7 | 393.7 | 12 | 1 3/8 |
| 10 | 545 | 69.9 | 368 | 273 | 323.8 | 7 | 469.9 | 16 | 1 3/8 |
| 12 | 610 | 79.4 | 419 | 323.8 | 381 | 7 | 533.4 | 20 | 1 3/8 |
| 14 | 640 | 85.8 | 451 | 355.6 | 412.8 | 7 | 558.8 | 20/td> | 1 /1/2 |
| 16 | 705 | 88.9 | 508 | 406.4 | 469.9 | 7 | 616 | 20 | 1 5/8 |
| 18 | 785 | 101.6 | 565 | 457 | 533.4 | 7 | 685.8 | 20 | 1 7/8 |
| 20 | 855 | 108 | 622 | 508 | 584.2 | 7 | 749.3 | 20 | 2 |
| 24 | 1040 | 139.7 | 749 | 610 | 692.2 | 7 | 901.7 | 20 | 2 1/2 |
Class 1500 Weld Neck Flange Dimension
| Size ( Inch) | OD ( mm ) | Flange Thickness (mm) | Hub OD | Weld Neck OD | RF Diameter (mm) | RF Height (mm) | PCD (mm) | No of BoIts | BoIt Size (UNC) |
|---|---|---|---|---|---|---|---|---|---|
| 1/2 | 120 | 22.3 | 38 | 21.3 | 34.9 | 7 | 82.6 | 4 | 3/4 |
| 3/4 | 130 | 25.4 | 44 | 26.7 | 42.9 | 7 | 88.9 | 4 | 3/4 |
| 1 | 150 | 28.6 | 52 | 33.4 | 50.8 | 7 | 101.6 | 4 | 7/8 |
| 1 1/4 | 160 | 28.6 | 64 | 42.2 | 63.5 | 7 | 111.1 | 4 | 7/8 |
| 1 1/2 | 180 | 31.8 | 70 | 48.3 | 73 | 7 | 123.8 | 4 | 1 |
| 2 | 215 | 38.1 | 105 | 60.3 | 92.1 | 7 | 165.1 | 8 | 7/8 |
| 2 1/2 | 245 | 41.3 | 124 | 73 | 104.8 | 7 | 190.5 | 8 | 1 |
| 3 | 265 | 47.7 | 133 | 88.9 | 127 | 7 | 203.2 | 8 | 1 1/8 |
| 4 | 310 | 54 | 162 | 114.3 | 157.2 | 7 | 241.3 | 8 | 1 1/4 |
| 5 | 375 | 73.1 | 197 | 141.3 | 185.7 | 7 | 292.1 | 8 | 1 1/2 |
| 6 | 395 | 82.6 | 229 | 168.3 | 215.9 | 7 | 317.5 | 12 | 1 3/8 |
| 8 | 485 | 92.1 | 292 | 219.1 | 269.9 | 7 | 393.7 | 12 | 1 5/8 |
| 10 | 585 | 108 | 368 | 273 | 323.8 | 7 | 482.6 | 12 | 1 7/8 |
| 12 | 675 | 123.9 | 451 | 323.8 | 381 | 7 | 571.5 | 16 | 2 |
| 14 | 750 | 133.4 | 495 | 355.6 | 412.8 | 7 | 635 | 16 | 2 1/4 |
| 16 | 825 | 146.1 | 552 | 406.4 | 469.9 | 7 | 704.8 | 16 | 2 1/2 |
| 18 | 915 | 162 | 597 | 457 | 533.4 | 7 | 774.7 | 16 | 2 3/4 |
| 20 | 985 | 177.8 | 641 | 508 | 584.2 | 7 | 831.8 | 16 | 3 |
| 24 | 1170 | 203.2 | 762 | 610 | 692.2 | 7 | 990.6 | 16 | 3 1/2 |
Class 2500 Weld Neck Flange Dimension
| Size ( Inch) | OD ( mm ) | Flange Thickness (mm) | Hub OD | Weld Neck OD | RF Diameter (mm) | RF Height (mm) | PCD (mm) | No of BoIts | BoIt Size (UNC) |
|---|---|---|---|---|---|---|---|---|---|
| 1/2 | 135 | 30.2 | 43 | 21.3 | 34.9 | 7 | 88.9 | 4 | 3/4 |
| 3/4 | 140 | 31.8 | 51 | 26.7 | 42.9 | 7 | 95.2 | 4 | 3/4 |
| 1 | 160 | 35 | 57 | 33.4 | 50.8 | 7 | 108 | 4 | 7/8 |
| 1 1/4 | 185 | 38.1 | 73 | 42.2 | 63.5 | 7 | 130.2 | 4 | 1 |
| 1 1/2 | 205 | 44.5 | 79 | 48.3 | 73 | 7 | 146 | 4 | 1 1/8 |
| 2 | 235 | 50.9 | 95 | 60.3 | 92.1 | 7 | 171.4 | 8 | 1 |
| 2 1/2 | 265 | 57.2 | 114 | 73 | 104.8 | 7 | 196.8 | 8 | 1 1/8 |
| 3 | 305 | 66.7 | 133 | 88.9 | 127 | 7 | 228.6 | 8 | 1 1/4 |
| 4 | 355 | 76.2 | 165 | 114.3 | 157.2 | 7 | 273 | 8 | 1 1/2 |
| 5 | 420 | 92.1 | 203 | 141.3 | 185.7 | 7 | 323.8 | 8 | 1 3/4 |
| 6 | 485 | 108 | 235 | 168.3 | 215.9 | 7 | 368.3 | 8 | 2 |
| 8 | 550 | 127 | 305 | 219.1 | 269.9 | 7 | 438.2 | 12 | 2 |
| 10 | 675 | 165.1 | 375 | 273 | 323.8 | 7 | 539.8 | 12 | 2 1/2 |
| 12 | 760 | 184.2 | 441 | 323.8 | 381 | 7 | 619.1 | 12 | 2 3/4 |
APPLICATIONS
Applications of Arrotop Weld Neck Orifice Flange Union
Arrotop Weld Neck Orifice Flange Unions are used in various industrial applications where precise flow measurement is essential. Key applications include:
- Chemical Processing: Used to measure and control the flow of chemicals, ensuring accurate mixing and reaction rates.
- Oil and Gas Industry: Essential for measuring the flow of crude oil, natural gas, and refined products in pipelines, ensuring efficient operation and monitoring.
- Power Generation: Employed in power plants to measure the flow of steam, water, and other fluids, optimizing the efficiency of turbines and boilers.
- Water Treatment: Used to monitor and control the flow of water and chemicals in treatment plants, ensuring proper purification and distribution.
- Pharmaceutical Industry: Applied in the production processes to measure the flow of various liquids and gases, ensuring precise dosage and mixture ratios.
- Food and Beverage Industry: Utilized to measure and control the flow of ingredients and products, maintaining quality and consistency in production processes.
ADVANTAGES
Advantages of Arrotop’s Weld Neck Orifice Flange Union
The Arrotop Weld Neck Orifice Flange Union offers several advantages, making it a preferred choice for precise flow measurement in various industries:
- Accuracy: Provides highly accurate flow measurement due to the precisely machined orifice plate.
- Reliability: The robust design and welded connection ensure a secure and leak-free installation, reducing maintenance needs.
- Durability: Made from high-quality materials, it can withstand high pressure and temperature conditions, making it suitable for demanding industrial environments.
- Versatility: Can be used with a wide range of fluids, including gases, liquids, and steam, across various industries.
- Ease of Installation: The weld neck design allows for straightforward installation and alignment with the piping system.
- Standardization: Available in various standard sizes and pressure ratings, facilitating integration into existing systems.
- Cost-Effective: Provides a cost-efficient solution for flow measurement compared to more complex flow meters.