Orifice Flange Explained (ASME B16.36)

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An Orifice Flange is used in combination with orifice meters to measure the flow rate of oil, gas and other liquids conveyed by the pipeline. Orifice flanges are manufactured to ASME B16.36 in multiple sizes and, material grades. 

WHAT IS AN ORIFICE FLANGE?

An orifice flange is used to measure the flow of the fluid conveyed by the pipeline via a flow nozzle positioned on the flange itself. Pairs of pressure tappings are machined onto the orifice flange, making separate tappings on the pipe wall unnecessary.

The traditional orifice flange assembly consists of a pair of flanges, orifice plate, bolts, nuts, gaskets, jacking screws and plugs. Jacking screws ensure the easy removal of the primary flow element.

Orifice flanges are available in all ASTM forged grades (ASTM A105, ASTM A350, ASTM A694, ASTM 182 respectively for carbon, alloy and, stainless steel flanges), dimensions (combinations of nominal sizes and pressure ratings) and, in socket weld, threaded or weld neck shape (WN is the most used).

ORIFICE FLANGE DIMENSIONS ASME B16.36


Notes for data shown in tables:

  • Dimensions are in millimeters (excluding bolts and bolt holes).
  • Different NPT sizes than 1/2 are available
  • Bolt lengths for RF flanges include an allowance for orifice and gasket thickness of 6 mm (0.25 in.) for NPS 1 to NPS 12. Bolt lengths for ring-type joint flanges include the allowance of 15 mm (0.62 in.) for NPS 1 to NPS 3.
  • Bore (B) has to be specified by the buyer
  • Stud Bolt lengths excl. the height of the chamfers

WELD NECK RF, CLASS 300

NPS A R O T H X Tg
1 33.4 50.8 125 36.6 81 54 6.4
1½ 48.3 73 155 36.6 84 70 6.4
2 60.3 92.1 165 36.6 84 84 6.4
2½ 73 104.8 190 36.6 87 100 6.4
3 88.9 127 210 36.6 87 117 9.5
4 114.3 157.2 255 36.6 90 146 12.7
6 168.3 215.9 320 36.6 98 206 12.7
8 219.1 269.9 380 39.7 110 260 12.7
10 273 323.8 445 46.1 116 321 12.7
12 323.8 381 520 49.3 129 375 12.7
14 355.6 412.8 585 52.4 141 425 12.7
16 406.4 469.9 650 55.6 144 483 12.7
18 457 533.4 710 58.8 157 533 12.7
20 508 584.2 775 62 160 587 12.7
24 610 692.2 915 68.3 167 702 12.7

 

NPS Bolt Diameter # Bolts Bolt holes diameter Bolts Diameter  Bolts length mm.
1 88.9 4 11/16  5/8 125
1½ 114.3 4 13/16  3/4 135
2 127 8 11/16  5/8 125
2½ 149.2 8 13/16  3/4 135
3 168.3 8 13/16  3/4 135
4 200 8 13/16  3/4 135
6 269.9 12 7/8  3/4 135
8 330.2 12 1  7/8 145
10 387.4 16 1 1/8 1 165
12 450.8 16 1¼ 1 1/8 180
14 514.4 20 1¼ 1 1/8 185
16 571.5 20 1 3/8 1¼ 195
18 628.6 24 1 3/8 1¼ 205
20 685.8 24 1 3/8 1¼ 215
24 812.8 24 1 3/8 1½ 240

COMMENTS: Height of Raised Face (RF) in CLASS 300 is 2 mm

WELD NECK RF, CLASS 600

NPS A R O T H X Tg
1 33.5 50.8 125 36.6 81 54 6.4
1½ 48.3 73 155 36.6 84 70 6.4
2 60.3 92.1 165 36.6 84 84 6.4
2½ 73 104.8 190 36.6 87 100 6.4
3 88.9 127 210 36.6 87 117 9.5
4 114.3 157.2 275 38.1 102 152 12.7
6 168.3 215.9 355 47.7 117 222 12.7
8 219.1 269.9 420 55.6 133 273 12.7
10 273 323.8 510 63.5 152 343 12.7
12 323.8 381 560 66.7 156 400 12.7
14 355.6 412.8 605 69.9 165 432 12.7
16 406.4 469.9 685 76.2 178 495 12.7
18 457.2 533.4 745 82.6 184 546 12.7
20 508 584.2 815 88.9 190 610 12.7
24 609.6 692.2 940 101.6 203 718 12.7

 

NPS BOLT CIRCLE DIAM. BOLTS # HOLES DIAM. BOLTS DIAMETER BOLTS LENGTH
1 88.9 4 11/16 5/8 125
1½ 114.3 4 13/16 3/4 135
2 127 8 11/16 5/8 125
2½ 149.2 8 13/16 3/4 135
3 168.3 8 13/16 3/4 135
4 215.9 8 1 7/8 150
6 292.1 12 1 1/8 1 180
8 349.2 12 1¼ 1 1/8 195
10 431.8 16 1 3/8 1¼ 220
12 489 20 1 3/8 1¼ 230
14 527 20 1½ 1 3/8 240
16 603.2 20 1 5/8 1½ 260
18 654 20 1 3/4 1 5/8 280
20 723.9 24 1 3/4 1 5/8 300
24 838.2 24 2 1 5/8 335

COMMENTS: Height of Raised Face (RF) in CLASS 600 is 2 mm at NPS 1 – NPS 3, and 7 mm at NPS 4 – NPS 24.

WELD NECK RF, CLASS 900

NPS R O T H X A Tg
1 50.8 125 36.6 81 54 33.5 6.4
1½ 73 155 36.6 84 70 48.3 6.4
2 92.1 165 36.6 84 84 60.3 6.4
2½ 104.8 190 36.6 87 100 73 6.4
3 127 240 38.1 102 127 88.9 9.5
4 157.2 290 44.5 114 159 114.3 12.7
6 215.9 380 55.6 140 235 168.3 12.7
8 269.9 470 63.5 162 298 219.1 12.7
10 323.8 545 69.9 184 368 273 12.7
12 381 610 79.4 200 419 323.8 12.7
14 412.8 640 85.8 213 451 355.6 12.7
16 469.9 705 88.9 216 508 406.4 12.7
18 533.4 785 101.6 229 565 457.2 12.7
20 584.2 855 108 248 622 508 12.7
24 692.2 1040 139.7 292 749 609.6 12.7

 

NPS BOLT CIRCLE DIAM. BOLTS # HOLES DIAM. BOLTS DIAMETER BOLTS LENGTH
1 88.9 4 11/16 5/8 125
1½ 114.3 4 13/16 3/4 135
2 127 8 11/16 5/8 125
2½ 149.2 8 13/16 3/4 135
3 190.5 8 1 7/8 150
4 235 8 1¼ 1 1/8 180
6 317.5 12 1¼ 1 1/8 195
8 393.7 12 1½ 1 3/8 230
10 469.9 16 1½ 1 3/8 240
12 533.4 20 1½ 1 3/8 260
14 558.8 20 1 5/8 1½ 280
16 616 20 1 3/4 1 5/8 290
18 685.8 20 2 1 7/8 330
20 749.3 20 2 1/8 2 355
24 901.7 20 2 1/8 2½ 445

COMMENTS: Height of Raised Face (RF) in CLASS 900 is 7 mm.

WELD NECK RF, CLASS 1500

NPS R O T H X A Tg
1 50.8 150 38.1 83 52 33.5 6.4
1½ 73 180 38.1 89 70 48.3 6.4
2 92.1 215 38.1 102 105 60.3 6.4
2½ 104.8 245 41.3 105 124 73 6.4
3 127 265 47.7 117 133 88.9 9.5
4 157.2 310 54 124 162 114.3 12.7
6 215.9 395 82.6 171 229 168.3 12.7
8 269.9 485 92.1 213 292 219.1 12.7
10 323.8 585 108 254 368 273 12.7
12 381 675 123.9 283 451 323.8 12.7
14 412.8 750 133.4 298 495 355.6 12.7
16 469.9 825 146.1 311 552 406.4 12.7
18 533.4 915 162 327 597 457.2 12.7
20 584.2 985 177.8 356 641 508 12.7
24 692.2 1170 203.2 406 762 609.6 12.7

 

NPS BOLT CIRCLE DIAM. BOLTS # HOLES DIAM. BOLTS DIAMETER BOLTS LENGTH
1 101.6 4 1 7/8 150
1½ 123.8 4 1 1/8 1¼ 160
2 165.1 8 1 7/8 150
2½ 190.5 8 1 1/8 1 165
3 203.2 8 1¼ 1 1/8 185
4 241.3 8 1 3/8 1¼ 205
6 317.5 12 1½ 1 3/8 265
8 393.7 12 1 3/4 1 5/8 300
10 482.6 12 2 1 7/8 345
12 571.6 16 2 1/8 2 380
14 635 16 2 3/8 2¼ 415
16 704.8 16 2 5/8 2½ 450
18 774.7 16 2 7/8 2 3/4 500
20 831.8 16 3 1/8 3 545
24 990.6 16 3 5/8 3½ 620

COMMENTS: Height of Raised Face (RF) in CLASS 1500 is 7 mm

WELD NECK RF, CLASS 2500

NPS R O T H X A Tg
1 50.8 160 38.1 92 57 33.5 6.4
1½ 73 205 44.5 111 79 48.3 6.4
2 92.1 235 50.8 127 95 60.3 6.4
2½ 104.8 265 57.2 143 114 73 6.4
3 127 305 66.7 168 133 88.9 9.5
4 157.2 355 76.2 190 165 114.3 12.7
6 215.9 485 108 273 235 168.3 12.7
8 269.9 550 127 318 305 219.1 12.7
10 323.8 675 165.1 419 375 273 12.7
12 381 760 184.2 464 441 323.8 12.7

 

NPS BOLT CIRCLE DIAM. BOLTS # HOLES DIAM. BOLTS DIAMETER BOLTS LENGTH
1 108 4 1 7/8 150
1½ 146 4 1¼ 1 1/8 180
2 171.4 8 1 1/8 1 185
2½ 196.8 8 1¼ 1 1/8 205
3 228.6 8 1 3/8 1¼ 230
4 273 8 1 5/8 1½ 260
6 368.3 8 2 1/8 2 350
8 438.2 12 2 1/8 2 385
10 539.8 12 2 5/8 2½ 490
12 619.1 12 2 7/8 2 3/4 540

COMMENTS: Height of Raised Face (RF) in CLASS 2500 is 7 mm.

WELD NECK RTJ, CLASS 600

NPS O T H GROOVE # P E
1 125 36.6 81 R16 50.8 6.35
1½ 155 36.6 84 R20 68.27 6.35
2 165 36.6 84 R23 82.55 7.92
2½ 190 36.6 87 R26 101.6 7.92
3 210 36.6 87 R31 123.83 7.92
4 275 38.1 102 R37 149.23 7.92
6 355 47.7 117 R45 211.12 7.92
8 420 55.6 133 R49 269.88 7.92
10 510 63.5 152 R53 323.85 7.92
12 560 66.7 156 R57 381 7.92
14 605 69.9 165 R61 419.1 7.92
16 685 76.2 178 R65 469.9 7.92
18 745 82.6 184 R69 533.4 7.92
20 815 88.9 190 R73 584.2 9.53
24 940 101.6 203 R77 692.15 11.13

 

NPS F R W X A Tg
1 8.74 0.8 25.4 54 33.5 6.4
1½ 8.74 0.8 25.4 70 48.3 6.4
2 11.91 0.8 27 84 60.3 6.4
2½ 11.91 0.8 27 100 73 6.4
3 11.91 0.8 27 117 88.9 9.5
4 11.91 0.8 27 152 114.3 12.7
6 11.91 0.8 27 222 168.3 12.7
8 11.91 0.8 27 273 219.1 12.7
10 11.91 0.8 27 343 273 12.7
12 11.91 0.8 27 400 323.8 12.7
14 11.91 0.8 27 432 355.6 12.7
16 11.91 0.8 30.2 495 406.4 12.7
18 11.91 0.8 30.2 546 457.2 12.7
20 13.49 1.5 31.8 610 508 12.7
24 16.66 1.5 36.5 718 609.6 12.7

WELD NECK RTJ, CLASS 900

NPS O  T H GROOVE # P E
1 125 36.6 81 R16 50.8 6.35
1½ 155 36.6 84 R20 68.27 6.35
2 165 36.6 84 R23 82.55 7.92
2½ 190 36.6 87 R26 101.6 7.92
3 240 38.1 102 R31 123.83 7.92
4 290 44.5 114 R37 149.23 7.92
6 380 55.6 140 R45 211.12 7.92
8 470 63.5 162 R49 269.88 7.92
10 545 69.9 184 R53 323.85 7.92
12 610 79.4 200 R57 381 7.92
14 640 85.8 213 R62 419.1 11.13
16 705 88.9 216 R66 469.9 11.13
18 785 101.6 229 R70 533.4 12.7
20 855 108 248 R74 584.2 12.7
24 1040 139.7 292 R78 692.15 15.88

 

NPS F R W X A Tg
1 8.74 0.8 25.4 54 33.5 6.4
1½ 8.74 0.8 25.4 70 48.3 6.4
2 11.91 0.8 27 84 60.3 6.4
2½ 11.91 0.8 27 100 73 6.4
3 11.91 0.8 27 127 88.9 9.5
4 11.91 0.8 27 159 114.3 12.7
6 11.91 0.8 27 235 168.3 12.7
8 11.91 0.8 27 298 219.1 12.7
10 11.91 0.8 27 368 273 12.7
12 11.91 0.8 27 419 323.8 12.7
14 16.66 1.5 33.3 451 355.6 12.7
16 16.66 1.5 36.5 508 406.4 12.7
18 19.84 1.5 39.7 565 457.2 12.7
20 19.84 1.5 39.7 622 508 12.7
24 26.97 2.4 47.6 749 609.6 12.7

WELD NECK RTJ, CLASS 1500

NPS O T H GROOVE # P E
1 150 38.1 83 R16 50.8 6.35
1½ 180 38.1 89 R20 68.27 6.35
2 215 38.1 102 R24 95.25 7.92
2½ 245 41.3 105 R27 107.95 7.92
3 265 47.7 117 R35 136.53 7.92
4 310 54 124 R39 161.93 7.92
6 395 82.6 171 R46 211.14 9.52
8 485 92.1 213 R50 269.88 11.13
10 585 108 254 R54 323.85 11.13
12 675 123.9 283 R58 381 14.27
14 750 133.4 298 R63 419.1 15.88
16 825 146.1 311 R67 469.9 17.48
18 915 162 327 R71 533.4 17.48
20 985 177.8 356 R75 584.2 17.48
24 1170 203.2 406 R79 692.15 20.62

 

NPS F R W X A Tg
1 8.74 0.8 25.4 52 33.5 6.4
1½ 8.74 0.8 25.4 70 48.3 6.4
2 11.91 0.8 27 105 60.3 6.4
2½ 11.91 0.8 27 124 73 6.4
3 11.91 0.8 27 133 88.9 9.5
4 11.91 0.8 27 162 114.3 12.7
6 13.49 1.5 28.6 229 168.3 12.7
8 16.66 1.5 33.3 292 219.1 12.7
10 16.66 1.5 33.3 368 273 12.7
12 23.01 1.5 39.7 451 323.8 12.7
14 26.97 2.4 44.4 495 355.6 12.7
16 30.18 2.4 50.8 552 406.4 12.7
18 30.18 2.4 50.8 597 457.2 12.7
20 33.32 2.4 54 641 508 12.7
24 36.53 2.4 58.7 762 609.6 12.7

WELD NECK RTJ, CLASS 2500 RTJ

2500# T H GROOVE # P E
1 160 38.1 92 R18 60.33 6.35
1½ 205 44.5 111 R23 82.55 7.92
2 235 50.8 127 R26 101.6 7.92
2½ 265 57.2 143 R28 111.13 9.53
3 305 66.7 168 R32 127 9.53
4 355 76.2 190 R38 157.18 11.13
6 485 108 273 R47 228.6 12.7
8 550 127 318 R51 279.4 14.27
10 675 165.1 419 R55 342.9 17.48
12 760 184.2 464 R60 406.4 17.48

 

2500# F R W X A Tg
1 8.74 0.8 25.4 57 33.5 6.4
1½ 11.91 0.8 27 79 48.3 6.4
2 11.91 0.8 27 95 60.3 6.4
2½ 13.49 1.5 30.2 114 73 6.4
3 13.49 1.5 30.2 133 88.9 9.5
4 16.66 1.5 33.3 165 114.3 12.7
6 19.84 1.5 36.5 235 168.3 12.7
8 23.01 1.5 39.7 305 219.1 12.7
10 30.18 2.4 47.6 375 273 12.7
12 33.32 2.4 50.8 441 323.8 12.7

 


ASME B 16.36 orifice flange dimensions and weight.pdf

This Standard covers flanges (similar to those covered in ASME B16.5) that have orifice pressure differential connections. The coverage of ASME B16.36 is limited to the following: (a) Welding Neck Flanges Classes 300-2500 (b) slip-on and threaded Class 300.

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