Orifice Flange
| An orifice flange is a specialized type of flange used in piping systems to hold and support an orifice plate, which is a device used to measure the flow rate of fluids. The orifice plate is inserted between the two flanges, and the assembly typically includes features for pressure tap connections to measure the differential pressure across the orifice. | |
Here are some key aspects of orifice flanges:
Design and Construction: Orifice flanges are usually made from materials like carbon steel, stainless steel, or other alloys depending on the application. They are designed to conform to standards such as those provided by the American Society of Mechanical Engineers (ASME) or the International Organization for Standardization (ISO).
Pressure Taps: The flanges are equipped with pressure taps that allow for the measurement of pressure on either side of the orifice plate. These taps are crucial for calculating the flow rate based on the differential pressure.
Standardization: Orifice flanges often follow specific standards to ensure compatibility and accuracy. Common standards include ASME B16.36 and ISO 5167, which specify dimensions and design features.
Applications: They are used in various industries, including oil and gas, chemical processing, water treatment, and HVAC systems, where accurate flow measurement is essential.
Maintenance and Installation: Proper installation and maintenance are crucial for accurate flow measurement. The orifice plate must be correctly aligned and the flanges securely fastened to prevent leaks and ensure accurate readings.
Overall, orifice flanges play a vital role in flow measurement systems by providing a reliable and standardized means of supporting the orifice plate and facilitating pressure measurements.
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Dimensions of Class 300 RF Orifice WN Flanges
Dimensions of Class 300 RF Orifice WN Flanges as per ASME B16.36.
Nominal Pipe Size, Diameter of Bolt Hole and Diameter of Stud Bolts are specified in inches.
All other dimensions are in “mm” unless noted otherwise.
| NPS inch | OD of Flange (O) | Dia of Raised Face (R) | Min Thk of Flange (T) | Weld Neck Length (Y) | Hub Dia at Base (X) | Hub Dia at End (A) | Weld Neck Bore (B) | Dia of Tap (Tt) | Bolt | No. of Bolt Holes | Dia of Bolt Holes | Dia of Bolts | Stud Bolt Length |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1 | 125 | 50.8 | 36.6 | 81 | 54 | 33.4 | (1) | 6.4 | 88.9 | 4 | 11/16 | 5/8 | 125 |
| 1-1/2 | 155 | 73 | 36.6 | 84 | 70 | 48.3 | (1) | 6.4 | 114.3 | 4 | 13/16 | 3/4 | 135 |
| 2 | 165 | 92.1 | 36.6 | 84 | 84 | 60.3 | (1) | 6.4 | 127 | 8 | 11/16 | 5/8 | 125 |
| 2-1/2 | 190 | 104.8 | 36.6 | 87 | 100 | 73 | (1) | 6.4 | 149.2 | 8 | 13/16 | 3/4 | 135 |
| 3 | 210 | 127 | 36.6 | 87 | 117 | 88.9 | (1) | 9.5 | 168.3 | 8 | 13/16 | 3/4 | 135 |
| 4 | 255 | 157.2 | 36.6 | 90 | 146 | 114.3 | (1) | 12.7 | 200 | 8 | 13/16 | 3/4 | 135 |
| 6 | 320 | 215.9 | 36.6 | 98 | 206 | 168.3 | (1) | 12.7 | 269.9 | 12 | 7/8 | 3/4 | 135 |
| 8 | 380 | 269.9 | 39.7 | 110 | 260 | 219.1 | (1) | 12.7 | 330.2 | 12 | 1 | 7/8 | 145 |
| 10 | 445 | 323.8 | 46.1 | 116 | 321 | 273 | (1) | 12.7 | 387.4 | 16 | 1-1/8 | 1 | 165 |
| 12 | 520 | 381 | 49.3 | 129 | 375 | 323.8 | (1) | 12.7 | 450.8 | 16 | 1-1/4 | 1-1/8 | 180 |
| 14 | 585 | 412.8 | 52.4 | 141 | 425 | 355.6 | (1) | 12.7 | 514.4 | 20 | 1-1/4 | 1-1/8 | 185 |
| 16 | 650 | 469.9 | 55.6 | 144 | 483 | 406.4 | (1) | 12.7 | 571.5 | 20 | 1-3/8 | 1-1/4 | 195 |
| 18 | 710 | 533.4 | 58.8 | 157 | 533 | 457 | (1) | 12.7 | 628.6 | 24 | 1-3/8 | 1-1/4 | 205 |
| 20 | 775 | 584.2 | 62 | 160 | 587 | 508 | (1) | 12.7 | 685.8 | 24 | 1-3/8 | 1-1/4 | 215 |
| 24 | 915 | 692.2 | 68.3 | 167 | 702 | 610 | (1) | 12.7 | 812.8 | 24 | 1-5/8 | 1-1/2 | 240 |
Note – (1) : Bore diameter of Orfice Flange (B) shall be specified by Purchaser.
Dimensions of Class 600 RF Orifice WN Flanges
Dimensions of Class 600 RF Orifice WN Flanges as per ASME B16.36.
Nominal Pipe Size, Diameter of Bolt Hole and Diameter of Stud Bolts are specified in inches.
All other dimensions are in “mm” unless noted otherwise.
| NPS inch | OD of Flange (O) | Dia of Raised Face (R) | Min Thk of Flange (T) | Weld Neck Length (Y) | Hub Dia at Base (X) | Hub Dia at End (A) | Weld Neck Bore (B) | Dia of Tap (Tt) | Bolt | No. of Bolt Holes | Dia of Bolt Holes | Dia of Bolts | Stud Bolt Length |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1 | 125 | 50.8 | 36.6 | 81 | 54 | 33.5 | (1) | 6.4 | 88.9 | 4 | 11/16 | 5/8 | 125 |
| 1-1/2 | 155 | 73 | 36.6 | 84 | 70 | 48.3 | (1) | 6.4 | 114.3 | 4 | 13/16 | 3/4 | 135 |
| 2 | 165 | 92.1 | 36.6 | 84 | 84 | 60.3 | (1) | 6.4 | 127 | 8 | 11/16 | 5/8 | 125 |
| 2-1/2 | 190 | 104.8 | 36.6 | 87 | 100 | 73 | (1) | 6.4 | 149.2 | 8 | 13/16 | 3/4 | 135 |
| 3 | 210 | 127 | 36.6 | 87 | 117 | 88.9 | (1) | 9.5 | 168.3 | 8 | 13/16 | 3/4 | 135 |
| 4 | 275 | 157.2 | 38.1 | 102 | 152 | 114.3 | (1) | 12.7 | 215.9 | 8 | 1 | 7/8 | 150 |
| 6 | 355 | 215.9 | 47.7 | 117 | 222 | 168.3 | (1) | 12.7 | 292.1 | 12 | 1-1/8 | 1 | 180 |
| 8 | 420 | 269.9 | 55.6 | 133 | 273 | 219.1 | (1) | 12.7 | 349.2 | 12 | 1-1/4 | 1-1/8 | 195 |
| 10 | 510 | 323.8 | 63.5 | 152 | 343 | 273 | (1) | 12.7 | 431.8 | 16 | 1-3/8 | 1-1/4 | 220 |
| 12 | 560 | 381 | 66.7 | 156 | 400 | 323.8 | (1) | 12.7 | 489 | 20 | 1-3/8 | 1-1/4 | 230 |
| 14 | 605 | 412.8 | 69.9 | 165 | 432 | 355.6 | (1) | 12.7 | 527 | 20 | 1-1/2 | 1-3/8 | 240 |
| 16 | 685 | 469.9 | 76.2 | 178 | 495 | 406.4 | (1) | 12.7 | 603.2 | 20 | 1-5/8 | 1-1/2 | 260 |
| 18 | 745 | 533.4 | 82.6 | 184 | 546 | 457.2 | (1) | 12.7 | 654 | 20 | 1-3/4 | 1-5/8 | 280 |
| 20 | 815 | 584.2 | 88.9 | 190 | 610 | 508 | (1) | 12.7 | 723.9 | 24 | 1-3/4 | 1-5/8 | 300 |
| 24 | 940 | 692.2 | 101.6 | 203 | 718 | 609.6 | (1) | 12.7 | 838.2 | 24 | 2 | 1-7/8 | 335 |
Note – (1) : Bore diameter of Orfice Flange (B) shall be specified by Purchaser
Dimensions of Class 900 RF Orifice WN Flanges
Dimensions of Class 900 RF Orifice WN Flanges as per ASME B16.36.
Nominal Pipe Size, Diameter of Bolt Hole and Diameter of Stud Bolts are specified in inches.
All other dimensions are in “mm” unless noted otherwise.
| NPS inch | OD of Flange (O) | Dia of Raised Face (R) | Min Thk of Flange (T) | Weld Neck Length (Y) | Hub Dia at Base (X) | Hub Dia at End (A) | Weld Neck Bore (B) | Dia of Tap (Tt) | Bolt | No. of Bolt Holes | Dia of Bolt Holes | Dia of Bolts | Stud Bolt Length |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1 | 150 | 50.8 | 38.1 | 83 | 52 | 33.5 | (1) | 6.4 | 101.6 | 4 | 1 | 7/8 | 150 |
| 1-1/2 | 180 | 73 | 38.1 | 89 | 70 | 48.3 | (1) | 6.4 | 123.8 | 4 | 1-1/8 | 1 | 160 |
| 2 | 215 | 92.1 | 38.1 | 102 | 105 | 60.3 | (1) | 6.4 | 165.1 | 8 | 1 | 7/8 | 150 |
| 2-1/2 | 245 | 104.8 | 41.3 | 105 | 124 | 73 | (1) | 6.4 | 190.5 | 8 | 1-1/8 | 1 | 165 |
| 3 | 240 | 127 | 38.1 | 102 | 127 | 88.9 | (1) | 9.5 | 190.5 | 8 | 1 | 7/8 | 150 |
| 4 | 290 | 157.2 | 44.5 | 114 | 159 | 114.3 | (1) | 12.7 | 235 | 8 | 1-1/4 | 1-1/8 | 180 |
| 6 | 380 | 215.9 | 55.6 | 140 | 235 | 168.3 | (1) | 12.7 | 317.5 | 12 | 1-1/4 | 1-1/8 | 195 |
| 8 | 470 | 269.9 | 63.5 | 162 | 298 | 219.1 | (1) | 12.7 | 393.7 | 12 | 1-1/2 | 1-3/8 | 230 |
| 10 | 545 | 323.8 | 69.9 | 184 | 368 | 273 | (1) | 12.7 | 469.9 | 16 | 1-1/2 | 1-3/8 | 240 |
| 12 | 610 | 381 | 79.4 | 200 | 419 | 323.8 | (1) | 12.7 | 533.4 | 20 | 1-1/2 | 1-3/8 | 260 |
| 14 | 640 | 412.8 | 85.8 | 213 | 451 | 355.6 | (1) | 12.7 | 558.8 | 20 | 1-5/8 | 1-1/2 | 280 |
| 16 | 705 | 469.9 | 88.9 | 216 | 508 | 406.4 | (1) | 12.7 | 616 | 20 | 1-3/4 | 1-5/8 | 290 |
| 18 | 785 | 533.4 | 101.6 | 229 | 565 | 457.2 | (1) | 12.7 | 685.8 | 20 | 2 | 1-7/8 | 330 |
| 20 | 855 | 584.2 | 108 | 248 | 622 | 508 | (1) | 12.7 | 749.3 | 20 | 2-1/8 | 2 | 355 |
| 24 | 1040 | 692.2 | 139.7 | 292 | 749 | 609.6 | (1) | 12.7 | 901.7 | 20 | 2-5/8 | 2-1/2 | 445 |
Note – (1) : Bore diameter of Orfice Flange (B) shall be specified by Purchaser.
Dimensions of Class 1500 RF Orifice WN Flanges
Dimensions of Class 1500 RF Orifice WN Flanges as per ASME B16.36.
Nominal Pipe Size, Diameter of Bolt Hole and Diameter of Stud Bolts are specified in inches.
All other dimensions are in “mm” unless noted otherwise.
| NPS inch | OD of Flange (O) | Dia of Raised Face (R) | Min Thk of Flange (T) | Weld Neck Length (Y) | Hub Dia at Base (X) | Hub Dia at End (A) | Weld Neck Bore (B) | Dia of Tap (Tt) | Bolt | No. of Bolt Holes | Dia of Bolt Holes | Dia of Bolts | Stud Bolt Length |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1 | 150 | 50.8 | 38.1 | 83 | 52 | 33.5 | (1) | 6.4 | 101.6 | 4 | 1 | 7/8 | 150 |
| 1-1/2 | 180 | 73 | 38.1 | 89 | 70 | 48.3 | (1) | 6.4 | 123.8 | 4 | 1-1/8 | 1 | 160 |
| 2 | 215 | 92.1 | 38.1 | 102 | 105 | 60.3 | (1) | 6.4 | 165.1 | 8 | 1 | 7/8 | 150 |
| 2-1/2 | 245 | 104.8 | 41.3 | 105 | 124 | 73 | (1) | 6.4 | 190.5 | 8 | 1-1/8 | 1 | 165 |
| 3 | 265 | 127 | 47.7 | 117 | 133 | 88.9 | (1) | 9.5 | 203.2 | 8 | 1-1/4 | 1-1/8 | 185 |
| 4 | 310 | 157.2 | 54 | 124 | 162 | 114.3 | (1) | 12.7 | 241.3 | 8 | 1-3/8 | 1-1/4 | 205 |
| 6 | 395 | 215.9 | 82.6 | 171 | 229 | 168.3 | (1) | 12.7 | 317.5 | 12 | 1-1/2 | 1-3/8 | 265 |
| 8 | 485 | 269.9 | 92.1 | 213 | 292 | 219.1 | (1) | 12.7 | 393.7 | 12 | 1-3/4 | 1-5/8 | 300 |
| 10 | 585 | 323.8 | 108 | 254 | 368 | 273 | (1) | 12.7 | 482.6 | 12 | 2 | 1-7/8 | 345 |
| 12 | 675 | 381 | 123.9 | 283 | 451 | 323.8 | (1) | 12.7 | 571.6 | 16 | 2-1/8 | 2 | 380 |
| 14 | 750 | 412.8 | 133.4 | 298 | 495 | 355.6 | (1) | 12.7 | 635 | 16 | 2-3/8 | 2-1/4 | 415 |
| 16 | 825 | 469.9 | 146.1 | 311 | 552 | 406.4 | (1) | 12.7 | 704.8 | 16 | 2-5/8 | 2-1/2 | 450 |
| 18 | 915 | 533.4 | 162 | 327 | 597 | 457.2 | (1) | 12.7 | 774.7 | 16 | 2-7/8 | 2-3/4 | 500 |
| 20 | 985 | 584.2 | 177.8 | 356 | 641 | 508 | (1) | 12.7 | 831.8 | 16 | 3-1/8 | 3 | 545 |
| 24 | 1170 | 692.2 | 203.2 | 406 | 762 | 609.6 | (1) | 12.7 | 990.6 | 16 | 3-5/8 | 3-1/2 | 620 |
Note – (1) : Bore diameter of Orfice Flange (B) shall be specified by Purchaser.
Dimensions of Class 2500 RF Orifice WN Flanges
Dimensions of Class 2500 RF Orifice WN Flanges as per ASME B16.36.
Nominal Pipe Size, Diameter of Bolt Hole and Diameter of Stud Bolts are specified in inches.
All other dimensions are in “mm” unless noted otherwise.
| NPS inch | OD of Flange (O) | Dia of Raised Face (R) | Min Thk of Flange (T) | Weld Neck Length (Y) | Hub Dia at Base (X) | Hub Dia at End (A) | Weld Neck Bore (B) | Dia of Tap (Tt) | Bolt | No. of Bolt Holes | Dia of Bolt Holes | Dia of Bolts | Stud Bolt Length |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1 | 160 | 50.8 | 38.1 | 92 | 57 | 33.5 | (1) | 6.4 | 108 | 4 | 1 | 7/8 | 150 |
| 1-1/2 | 205 | 73 | 44.5 | 111 | 79 | 48.3 | (1) | 6.4 | 146 | 4 | 1-1/4 | 1-1/8 | 180 |
| 2 | 235 | 92.1 | 50.8 | 127 | 95 | 60.3 | (1) | 6.4 | 171.4 | 8 | 1-1/8 | 1 | 185 |
| 2-1/2 | 265 | 104.8 | 57.2 | 143 | 114 | 73 | (1) | 6.4 | 196.8 | 8 | 1-1/4 | 1-1/8 | 205 |
| 3 | 305 | 127 | 66.7 | 168 | 133 | 88.9 | (1) | 9.5 | 228.6 | 8 | 1-3/8 | 1-1/4 | 230 |
| 4 | 355 | 157.2 | 76.2 | 190 | 165 | 114.3 | (1) | 12.7 | 273 | 8 | 1-5/8 | 1-1/2 | 260 |
| 6 | 485 | 215.9 | 108 | 273 | 235 | 168.3 | (1) | 12.7 | 368.3 | 8 | 2-1/8 | 2 | 350 |
| 8 | 550 | 269.9 | 127 | 318 | 305 | 219.1 | (1) | 12.7 | 438.2 | 12 | 2-1/8 | 2 | 385 |
| 10 | 675 | 323.8 | 165.1 | 419 | 375 | 273 | (1) | 12.7 | 539.8 | 12 | 2-5/8 | 2-1/2 | 490 |
| 12 | 760 | 381 | 184.2 | 464 | 441 | 323.8 | (1) | 12.7 | 619.1 | 12 | 2-7/8 | 2-3/4 | 540 |
Note – (1) : Bore diameter of Orfice Flange (B) shall be specified by Purchaser.
Dimensions of Class 300 RF Orifice WN Flanges – Imperial
Dimensions of Class 300 RF Orifice WN Flanges as per ASME B16.36.
All other dimensions are in “inches” unless noted otherwise.
| NPS inch | OD of Flange (O) | Dia of Raised Face (R) | Min Thk of Flange (T) | Weld Neck Length (Y) | Hub Dia at Base (X) | Hub Dia at End (A) | Weld Neck Bore (B) | Dia of Tap (Tt) | Bolt | No. of Bolt Holes | Dia of Bolt Holes | Dia of Bolts | Stud Bolt Length |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1 | 4.88 | 2 | 1.50 | 3.25 | 2.12 | 1.32 | (1) | 1/4 | 3.50 | 4 | 0.69 | 5/8 | 5 |
| 1-1/2 | 6.12 | 2.88 | 1.50 | 3.38 | 2.75 | 1.90 | (1) | 1/4 | 4.50 | 4 | 0.81 | 3/4 | 5.25 |
| 2 | 6.50 | 3.62 | 1.50 | 3.38 | 3.31 | 2.38 | (1) | 1/4 | 5 | 8 | 0.69 | 5/8 | 5 |
| 2-1/2 | 7.50 | 4.12 | 1.50 | 3.50 | 3.94 | 2.88 | (1) | 1/4 | 5.88 | 8 | 0.81 | 3/4 | 5.25 |
| 3 | 8.25 | 5 | 1.50 | 3.50 | 4.62 | 3.50 | (1) | 3/8 | 6.62 | 8 | 0.81 | 3/4 | 5.25 |
| 4 | 10 | 6.19 | 1.50 | 3.62 | 5.75 | 4.50 | (1) | 1/2 | 7.88 | 8 | 0.81 | 3/4 | 5.25 |
| 6 | 12.50 | 8.50 | 1.50 | 3.94 | 8.12 | 6.63 | (1) | 1/2 | 10.62 | 12 | 0.88 | 3/4 | 5.25 |
| 8 | 15 | 10.62 | 1.62 | 4.38 | 10.25 | 8.63 | (1) | 1/2 | 13 | 12 | 1 | 7/8 | 5.75 |
| 10 | 17.50 | 12.75 | 1.88 | 4.62 | 12.62 | 10.75 | (1) | 1/2 | 15.25 | 16 | 1.12 | 1 | 6.50 |
| 12 | 20.50 | 15 | 2 | 5.12 | 14.75 | 12.75 | (1) | 1/2 | 17.75 | 16 | 1.25 | 1-1/8 | 7 |
| 14 | 23 | 16.25 | 2.12 | 5.62 | 16.75 | 14 | (1) | 1/2 | 20.25 | 20 | 1.25 | 1-1/8 | 7.25 |
| 16 | 25.50 | 18.50 | 2.25 | 5.75 | 19 | 16 | (1) | 1/2 | 22.50 | 20 | 1.38 | 1-1/4 | 7.75 |
| 18 | 28 | 21 | 2.38 | 6.25 | 21 | 18 | (1) | 1/2 | 24.75 | 24 | 1.38 | 1-1/4 | 8 |
| 20 | 30.50 | 23 | 2.50 | 6.38 | 23.12 | 20 | (1) | 1/2 | 27 | 24 | 1.38 | 1-1/4 | 8.50 |
| 24 | 36 | 27.25 | 2.75 | 6.62 | 27.62 | 24 | (1) | 1/2 | 32 | 24 | 1.62 | 1-1/2 | 9.50 |
Note – (1) : Bore diameter of Orfice Flange (B) shall be specified by Purchaser.
Dimensions of Class 600 RF Orifice WN Flanges – Imperial
Dimensions of Class 600 RF Orifice WN Flanges as per ASME B16.36.
All other dimensions are in “inches” unless noted otherwise.
| NPS inch | OD of Flange (O) | Dia of Raised Face (R) | Min Thk of Flange (T) | Weld Neck Length (Y) | Hub Dia at Base (X) | Hub Dia at End (A) | Weld Neck Bore (B) | Dia of Tap (Tt) | Bolt | No. of Bolt Holes | Dia of Bolt Holes | Dia of Bolts | Stud Bolt Length |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1 | 4.88 | 2 | 1.44 | 3.19 | 2.12 | 1.32 | (1) | 1/4 | 3.50 | 4 | 0.69 | 5/8 | 5 |
| 1-1/2 | 6.12 | 2.88 | 1.44 | 3.32 | 2.75 | 1.90 | (1) | 1/4 | 4.50 | 4 | 0.81 | 3/4 | 5.25 |
| 2 | 6.50 | 3.62 | 1.44 | 3.32 | 3.31 | 2.38 | (1) | 1/4 | 5 | 8 | 0.69 | 5/8 | 5 |
| 2-1/2 | 7.50 | 4.12 | 1.44 | 3.44 | 3.94 | 2.88 | (1) | 1/4 | 5.88 | 8 | 0.81 | 3/4 | 5.25 |
| 3 | 8.25 | 5 | 1.44 | 3.44 | 4.62 | 3.50 | (1) | 3/8 | 6.62 | 8 | 0.81 | 3/4 | 5.25 |
| 4 | 10.75 | 6.19 | 1.50 | 4 | 6 | 4.50 | (1) | 1/2 | 8.50 | 8 | 1 | 7/8 | 6 |
| 6 | 14 | 8.50 | 1.88 | 4.62 | 8.75 | 6.63 | (1) | 1/2 | 11.50 | 12 | 1.12 | 1 | 7 |
| 8 | 16.50 | 10.62 | 2.19 | 5.25 | 10.75 | 8.63 | (1) | 1/2 | 13.75 | 12 | 1.25 | 1-1/8 | 7.75 |
| 10 | 20 | 12.75 | 2.50 | 6 | 13.50 | 10.75 | (1) | 1/2 | 17 | 16 | 1.38 | 1-1/4 | 8.75 |
| 12 | 22 | 15 | 2.62 | 6.12 | 15.75 | 12.75 | (1) | 1/2 | 19.25 | 20 | 1.38 | 1-1/4 | 9 |
| 14 | 23.75 | 16.25 | 2.75 | 6.50 | 17 | 14 | (1) | 1/2 | 20.75 | 20 | 1.50 | 1-3/8 | 9.50 |
| 16 | 27 | 18.50 | 3 | 7 | 19.50 | 16 | (1) | 1/2 | 23.75 | 20 | 1.62 | 1-1/2 | 10.25 |
| 18 | 29.25 | 21 | 3.25 | 7.25 | 21.50 | 18 | (1) | 1/2 | 25.75 | 20 | 1.75 | 1-5/8 | 11 |
| 20 | 32 | 23 | 3.50 | 7.50 | 24 | 20 | (1) | 1/2 | 28.50 | 24 | 1.75 | 1-5/8 | 11.75 |
| 24 | 37 | 27.25 | 4 | 8 | 28.25 | 24 | (1) | 1/2 | 33 | 24 | 2 | 1-7/8 | 13.25 |
Note – (1) : Bore diameter of Orfice Flange (B) shall be specified by Purchaser.
Dimensions of Class 900 RF Orifice WN Flanges – Imperial
Dimensions of Class 900 RF Orifice WN Flanges as per ASME B16.36.
All other dimensions are in “inches” unless noted otherwise.
| NPS inch | OD of Flange (O) | Dia of Raised Face (R) | Min Thk of Flange (T) | Weld Neck Length (Y) | Hub Dia at Base (X) | Hub Dia at End (A) | Weld Neck Bore (B) | Dia of Tap (Tt) | Bolt | No. of Bolt Holes | Dia of Bolt Holes | Dia of Bolts | Stud Bolt Length |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 3 | 9.50 | 5 | 1.50 | 4 | 5 | 3.50 | (1) | 3/8 | 7.50 | 8 | 1 | 7/8 | 6 |
| 4 | 11.50 | 6.19 | 1.75 | 4.50 | 6.25 | 4.50 | (1) | 1/2 | 9.25 | 8 | 1.25 | 1-1/8 | 7 |
| 6 | 15 | 8.50 | 2.19 | 5.50 | 9.25 | 6.63 | (1) | 1/2 | 12.50 | 12 | 1.25 | 1-1/8 | 7.75 |
| 8 | 18.50 | 10.62 | 2.50 | 6.38 | 11.75 | 8.63 | (1) | 1/2 | 15.50 | 12 | 1.50 | 1-3/8 | 9 |
| 10 | 21.50 | 12.75 | 2.75 | 7.25 | 14.50 | 10.75 | (1) | 1/2 | 18.50 | 16 | 1.50 | 1-3/8 | 9.50 |
| 12 | 24 | 15 | 3.12 | 7.88 | 16.50 | 12.75 | (1) | 1/2 | 21 | 20 | 1.50 | 1-3/8 | 10.25 |
| 14 | 25.25 | 16.25 | 3.38 | 8.38 | 17.75 | 14 | (1) | 1/2 | 22 | 20 | 1.62 | 1-1/2 | 11 |
| 16 | 27.75 | 18.50 | 3.50 | 8.50 | 20 | 16 | (1) | 1/2 | 24.25 | 20 | 1.75 | 1-5/8 | 11.50 |
| 18 | 31 | 21 | 4 | 9 | 22.25 | 18 | (1) | 1/2 | 27 | 20 | 2 | 1-7/8 | 13 |
| 20 | 33.75 | 23 | 4.25 | 9.75 | 24.50 | 20 | (1) | 1/2 | 29.50 | 20 | 2.12 | 2 | 14 |
| 24 | 41 | 27.25 | 5.50 | 11.50 | 29.50 | 24 | (1) | 1/2 | 35.50 | 20 | 2.62 | 2-1/2 | 17.50 |
Note – (1) : Bore diameter of Orfice Flange (B) shall be specified by Purchaser.
Dimensions of Class 1500 RF Orifice WN Flanges – Imperial
Dimensions of Class 1500 RF Orifice WN Flanges as per ASME B16.36.
All other dimensions are in “inches” unless noted otherwise.
| NPS inch | OD of Flange (O) | Dia of Raised Face (R) | Min Thk of Flange (T) | Weld Neck Length (Y) | Hub Dia at Base (X) | Hub Dia at End (A) | Weld Neck Bore (B) | Dia of Tap (Tt) | Bolt | No. of Bolt Holes | Dia of Bolt Holes | Dia of Bolts | Stud Bolt Length |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1 | 5.88 | 2 | 1.50 | 3.25 | 2.06 | 1.32 | (1) | 1/4 | 4 | 4 | 1 | 7/8 | 6 |
| 1-1/2 | 7 | 2.88 | 1.50 | 3.50 | 2.75 | 1.90 | (1) | 1/4 | 4.88 | 4 | 1.12 | 1 | 6.25 |
| 2 | 8.50 | 3.62 | 1.50 | 4 | 4.12 | 2.38 | (1) | 1/4 | 6.50 | 8 | 1 | 7/8 | 6 |
| 2-1/2 | 9.62 | 4.12 | 1.62 | 4.12 | 4.88 | 2.88 | (1) | 1/4 | 7.50 | 8 | 1.12 | 1 | 6.50 |
| 3 | 10.50 | 5 | 1.88 | 4.62 | 5.25 | 3.50 | (1) | 3/8 | 8 | 8 | 1.25 | 1-1/8 | 7.25 |
| 4 | 12.25 | 6.19 | 2.12 | 4.88 | 6.38 | 4.50 | (1) | 1/2 | 9.50 | 8 | 1.38 | 1-1/4 | 8 |
| 6 | 15.50 | 8.50 | 3.25 | 6.75 | 9 | 6.63 | (1) | 1/2 | 12.50 | 12 | 1.50 | 1-3/8 | 10.50 |
| 8 | 19 | 10.62 | 3.62 | 8.38 | 11.50 | 8.63 | (1) | 1/2 | 15.50 | 12 | 1.75 | 1-5/8 | 11.75 |
| 10 | 23 | 12.75 | 4.25 | 10 | 14.50 | 10.75 | (1) | 1/2 | 19 | 12 | 2 | 1-7/8 | 13.50 |
| 12 | 26.50 | 15 | 4.88 | 11.12 | 17.75 | 12.75 | (1) | 1/2 | 22.50 | 16 | 2.12 | 2 | 15 |
| 14 | 29.50 | 16.25 | 5.25 | 11.75 | 19.50 | 14 | (1) | 1/2 | 25 | 16 | 2.38 | 2-1/4 | 16.25 |
| 16 | 32.50 | 18.50 | 5.75 | 12.25 | 21.75 | 16 | (1) | 1/2 | 27.75 | 16 | 2.62 | 2-1/2 | 17.75 |
| 18 | 36 | 21 | 6.38 | 12.88 | 23.50 | 18 | (1) | 1/2 | 30.50 | 16 | 2.88 | 2-3/4 | 19.75 |
| 20 | 38.75 | 23 | 7 | 14 | 25.25 | 20 | (1) | 1/2 | 32.75 | 16 | 3.12 | 3 | 21.50 |
| 24 | 46 | 27.25 | 8 | 16 | 30 | 24 | (1) | 1/2 | 39 | 16 | 3.62 | 3-1/2 | 24.50 |
Note – (1) : Bore diameter of Orfice Flange (B) shall be specified by Purchaser.
Dimensions of Class 2500 RF Orifice WN Flanges – Imperial
Dimensions of Class 2500 RF Orifice WN Flanges as per ASME B16.36.
All other dimensions are in “inches” unless noted otherwise.
| NPS inch | OD of Flange (O) | Dia of Raised Face (R) | Min Thk of Flange (T) | Weld Neck Length (Y) | Hub Dia at Base (X) | Hub Dia at End (A) | Weld Neck Bore (B) | Dia of Tap (Tt) | Bolt | No. of Bolt Holes | Dia of Bolt Holes | Dia of Bolts | Stud Bolt Length |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1 | 6.25 | 2 | 1.50 | 3.62 | 2.25 | 1.32 | (1) | 1/4 | 4.25 | 4 | 1 | 7/8 | 6 |
| 1-1/2 | 8 | 2.88 | 1.75 | 4.38 | 3.12 | 1.90 | (1) | 1/4 | 5.75 | 4 | 1.25 | 1-1/8 | 7 |
| 2 | 9.25 | 3.62 | 2 | 5 | 3.75 | 2.38 | (1) | 1/4 | 6.75 | 8 | 1.12 | 1 | 7.25 |
| 2-1/2 | 10.50 | 4.12 | 2.25 | 5.62 | 4.50 | 2.88 | (1) | 1/4 | 7.75 | 8 | 1.25 | 1-1/8 | 8 |
| 3 | 12 | 5 | 2.62 | 6.62 | 5.25 | 3.50 | (1) | 3/8 | 9 | 8 | 1.38 | 1-1/4 | 9 |
| 4 | 14 | 6.19 | 3 | 7.50 | 6.50 | 4.50 | (1) | 1/2 | 10.75 | 8 | 1.62 | 1-1/2 | 10.25 |
| 6 | 19 | 8.50 | 4.25 | 10.75 | 9.25 | 6.63 | (1) | 1/2 | 14.50 | 8 | 2.12 | 2 | 13.75 |
| 8 | 21.75 | 10.62 | 5 | 12.50 | 12 | 8.63 | (1) | 1/2 | 17.25 | 12 | 2.12 | 2 | 15.25 |
| 10 | 26.50 | 12.75 | 6.50 | 16.50 | 14.75 | 10.75 | (1) | 1/2 | 21.25 | 12 | 2.62 | 2-1/2 | 19.25 |
| 12 | 30 | 15 | 7.25 | 18.25 | 17.38 | 12.75 | (1) | 1/2 | 24.38 | 12 | 2.88 | 2-3/4 | 21.25 |
Note – (1) : Bore diameter of Orfice Flange (B) shall be specified by Purchaser.