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Orifice Flange Explained (ASME B16.36)

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).

types of orifice flanges

ORIFICE FLANGE DIMENSIONS ASME B16.36

Orifice flange ASME
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

orifice flange dimension

NPSAROTHXTg
133.450.812536.681546.4
48.37315536.684706.4
260.392.116536.684846.4
73104.819036.6871006.4
388.912721036.6871179.5
4114.3157.225536.69014612.7
6168.3215.932036.69820612.7
8219.1269.938039.711026012.7
10273323.844546.111632112.7
12323.838152049.312937512.7
14355.6412.858552.414142512.7
16406.4469.965055.614448312.7
18457533.471058.815753312.7
20508584.27756216058712.7
24610692.291568.316770212.7

 

NPSBolt Diameter# BoltsBolt holes diameterBolts Diameter Bolts length mm.
188.9411/16 5/8125
114.3413/16 3/4135
2127811/16 5/8125
149.2813/16 3/4135
3168.3813/16 3/4135
4200813/16 3/4135
6269.9127/8 3/4135
8330.2121 7/8145
10387.4161 1/81165
12450.8161 1/8180
14514.4201 1/8185
16571.5201 3/8195
18628.6241 3/8205
20685.8241 3/8215
24812.8241 3/8240

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

WELD NECK RF, CLASS 600

orifice flange dimension

NPSAROTHXTg
133.550.812536.681546.4
48.37315536.684706.4
260.392.116536.684846.4
73104.819036.6871006.4
388.912721036.6871179.5
4114.3157.227538.110215212.7
6168.3215.935547.711722212.7
8219.1269.942055.613327312.7
10273323.851063.515234312.7
12323.838156066.715640012.7
14355.6412.860569.916543212.7
16406.4469.968576.217849512.7
18457.2533.474582.618454612.7
20508584.281588.919061012.7
24609.6692.2940101.620371812.7

 

NPSBOLT CIRCLE DIAM.BOLTS #HOLES DIAM.BOLTS DIAMETERBOLTS LENGTH
188.9411/165/8125
114.3413/163/4135
2127811/165/8125
149.2813/163/4135
3168.3813/163/4135
4215.9817/8150
6292.1121 1/81180
8349.2121 1/8195
10431.8161 3/8220
12489201 3/8230
14527201 3/8240
16603.2201 5/8260
18654201 3/41 5/8280
20723.9241 3/41 5/8300
24838.22421 5/8335

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

orifice flange dimension

NPSROTHXATg
150.812536.6815433.56.4
7315536.6847048.36.4
292.116536.6848460.36.4
104.819036.687100736.4
312724038.110212788.99.5
4157.229044.5114159114.312.7
6215.938055.6140235168.312.7
8269.947063.5162298219.112.7
10323.854569.918436827312.7
1238161079.4200419323.812.7
14412.864085.8213451355.612.7
16469.970588.9216508406.412.7
18533.4785101.6229565457.212.7
20584.285510824862250812.7
24692.21040139.7292749609.612.7

 

NPSBOLT CIRCLE DIAM.BOLTS #HOLES DIAM.BOLTS DIAMETERBOLTS LENGTH
188.9411/165/8125
114.3413/163/4135
2127811/165/8125
149.2813/163/4135
3190.5817/8150
423581 1/8180
6317.5121 1/8195
8393.7121 3/8230
10469.9161 3/8240
12533.4201 3/8260
14558.8201 5/8280
16616201 3/41 5/8290
18685.82021 7/8330
20749.3202 1/82355
24901.7202 1/8445

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

WELD NECK RF, CLASS 1500

orifice flange dimension

NPSROTHXATg
150.815038.1835233.56.4
7318038.1897048.36.4
292.121538.110210560.36.4
104.824541.3105124736.4
312726547.711713388.99.5
4157.231054124162114.312.7
6215.939582.6171229168.312.7
8269.948592.1213292219.112.7
10323.858510825436827312.7
12381675123.9283451323.812.7
14412.8750133.4298495355.612.7
16469.9825146.1311552406.412.7
18533.4915162327597457.212.7
20584.2985177.835664150812.7
24692.21170203.2406762609.612.7

 

NPSBOLT CIRCLE DIAM.BOLTS #HOLES DIAM.BOLTS DIAMETERBOLTS LENGTH
1101.6417/8150
123.841 1/8160
2165.1817/8150
190.581 1/81165
3203.281 1/8185
4241.381 3/8205
6317.5121 3/8265
8393.7121 3/41 5/8300
10482.61221 7/8345
12571.6162 1/82380
14635162 3/8415
16704.8162 5/8450
18774.7162 7/82 3/4500
20831.8163 1/83545
24990.6163 5/8620

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

WELD NECK RF, CLASS 2500

orifice flange dimension

NPSROTHXATg
150.816038.1925733.56.4
7320544.51117948.36.4
292.123550.81279560.36.4
104.826557.2143114736.4
312730566.716813388.99.5
4157.235576.2190165114.312.7
6215.9485108273235168.312.7
8269.9550127318305219.112.7
10323.8675165.141937527312.7
12381760184.2464441323.812.7

 

NPSBOLT CIRCLE DIAM.BOLTS #HOLES DIAM.BOLTS DIAMETERBOLTS LENGTH
1108417/8150
14641 1/8180
2171.481 1/81185
196.881 1/8205
3228.681 3/8230
427381 5/8260
6368.382 1/82350
8438.2122 1/82385
10539.8122 5/8490
12619.1122 7/82 3/4540

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

WELD NECK RTJ, CLASS 600

Orifice flange RTJ dimension

NPSOTHGROOVE #PE
112536.681R1650.86.35
15536.684R2068.276.35
216536.684R2382.557.92
19036.687R26101.67.92
321036.687R31123.837.92
427538.1102R37149.237.92
635547.7117R45211.127.92
842055.6133R49269.887.92
1051063.5152R53323.857.92
1256066.7156R573817.92
1460569.9165R61419.17.92
1668576.2178R65469.97.92
1874582.6184R69533.47.92
2081588.9190R73584.29.53
24940101.6203R77692.1511.13

 

NPSFRWXATg
18.740.825.45433.56.4
8.740.825.47048.36.4
211.910.8278460.36.4
11.910.827100736.4
311.910.82711788.99.5
411.910.827152114.312.7
611.910.827222168.312.7
811.910.827273219.112.7
1011.910.82734327312.7
1211.910.827400323.812.7
1411.910.827432355.612.7
1611.910.830.2495406.412.7
1811.910.830.2546457.212.7
2013.491.531.861050812.7
2416.661.536.5718609.612.7

WELD NECK RTJ, CLASS 900

Orifice flange RTJ dimension

NPSTHGROOVE #PE
112536.681R1650.86.35
15536.684R2068.276.35
216536.684R2382.557.92
19036.687R26101.67.92
324038.1102R31123.837.92
429044.5114R37149.237.92
638055.6140R45211.127.92
847063.5162R49269.887.92
1054569.9184R53323.857.92
1261079.4200R573817.92
1464085.8213R62419.111.13
1670588.9216R66469.911.13
18785101.6229R70533.412.7
20855108248R74584.212.7
241040139.7292R78692.1515.88

 

NPSFRWXATg
18.740.825.45433.56.4
8.740.825.47048.36.4
211.910.8278460.36.4
11.910.827100736.4
311.910.82712788.99.5
411.910.827159114.312.7
611.910.827235168.312.7
811.910.827298219.112.7
1011.910.82736827312.7
1211.910.827419323.812.7
1416.661.533.3451355.612.7
1616.661.536.5508406.412.7
1819.841.539.7565457.212.7
2019.841.539.762250812.7
2426.972.447.6749609.612.7

WELD NECK RTJ, CLASS 1500

Orifice flange RTJ dimension

NPSOTHGROOVE #PE
115038.183R1650.86.35
18038.189R2068.276.35
221538.1102R2495.257.92
24541.3105R27107.957.92
326547.7117R35136.537.92
431054124R39161.937.92
639582.6171R46211.149.52
848592.1213R50269.8811.13
10585108254R54323.8511.13
12675123.9283R5838114.27
14750133.4298R63419.115.88
16825146.1311R67469.917.48
18915162327R71533.417.48
20985177.8356R75584.217.48
241170203.2406R79692.1520.62

 

NPSFRWXATg
18.740.825.45233.56.4
8.740.825.47048.36.4
211.910.82710560.36.4
11.910.827124736.4
311.910.82713388.99.5
411.910.827162114.312.7
613.491.528.6229168.312.7
816.661.533.3292219.112.7
1016.661.533.336827312.7
1223.011.539.7451323.812.7
1426.972.444.4495355.612.7
1630.182.450.8552406.412.7
1830.182.450.8597457.212.7
2033.322.45464150812.7
2436.532.458.7762609.612.7

WELD NECK RTJ, CLASS 2500 RTJ

Orifice flange RTJ dimension

2500#THGROOVE #PE
116038.192R1860.336.35
20544.5111R2382.557.92
223550.8127R26101.67.92
26557.2143R28111.139.53
330566.7168R321279.53
435576.2190R38157.1811.13
6485108273R47228.612.7
8550127318R51279.414.27
10675165.1419R55342.917.48
12760184.2464R60406.417.48

 

2500#FRWXATg
18.740.825.45733.56.4
11.910.8277948.36.4
211.910.8279560.36.4
13.491.530.2114736.4
313.491.530.213388.99.5
416.661.533.3165114.312.7
619.841.536.5235168.312.7
823.011.539.7305219.112.7
1030.182.447.637527312.7
1233.322.450.8441323.812.7

 

Orifice flange dimension ASME B16.36
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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