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Orifice Flange

Flange

Orifice flange Materials

Eathu can supply orifice flanges in a wide range of standard and special materials, including:

ASTMA105 Carbon Steel

ASTM A350 LF2 Low Temp Carbon Steel

ASTM A182 F316 Stainless Steel

ASTM A182 F304 Stainless Steel

ASTM A182 F11 1% Cr 1/2% Mo

ASTM A182 F22 2-1/4% Cr 1% Mo

Size:  1/2" ~ 24" (DN15 ~ DN600) 

Introduction



Orifice flanges are intended for use instead of standard pipe flanges when an orifice plate or flow nozzle must be installed. Pairs of pressure tappings are machined into the orifice flange,making separate orifice carriers or tappings in the pipe wall unnecessary.

EATHU's orifice range of orifice flanges covers all standard sizes and ranges, and all common flange materials.

Flanges are available in socket weld or weld neck form, and are typically supplied with two 1/2" NPT tappings in each flange. Jacking screws to ensure ease of removal of the primary flow element are provided.

Orifice plates and flow nozzles can also be supplied.  Check Eathu Orifice Flange Data Sheets from "Price list and Technical".

Orifice flanges may also be supplied complete with bolting and gasket kits.


The function of the orifice flange is to measure the rate of the flow of the commodity through the piping system. Orifice flanges are easy to recognize because they have a hole drilled through the face of the flange perpendicular to the pipe. They also have an additional set of bolts called jack screws. These screws are used to help separate the flanges so inspection and/or replacement of the orifice plate can be performed. The orifice flange is a single component of the orifice flange union assembly. The orifice flange union is composed of two orifice flanges, an orifice plate, bolts, nuts, jack screws, and two gaskets.


Orifice flange's pressure ratings is 300LB, 600LB, 900LB, 1500LB, 2500LB, and the Orifice flange Surface treatment is antirust oil, black painting, yellow painting, transparent, electric galvanized or hot galvanized. For South American clients, the most popular surface treatment is Black painting. 

The Packing for Orifice Flange is plywood pallet, the delivery time is 30days after receiving the formal order. If you have special delivery time please contact Eathu, then we can give you the soonest delivery time. Please note our MOQ for Orifice Flange is 1 pallet. 


Orifice flange used for: Petroleum, chemical industry, water conversancy, electric power, Natural gas, Coal gas, Water power and other pipeline projects. 


ORIFICE FLANGE DIMENSIONS OF WELD NECK RF, CLASS 300

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" 5/8"125
114.3411/16" 3/4"135
2127811/16" 5/8"125
149.2813/16" 3/4"135
3168.3813/16" 3/4"135
4200813/16" 3/4"135
6269.9127/8" 3/4"135
8330.2121" 7/8"145
10387.4161-1/8"1"165
12450.8161-1/4"1-1/8"180
14514.4201-1/4"1-1/8"185
16571.5201-3/8"1-1/4"195
18628.6241-3/8"1-1/4"205
20685.8241-3/8"1-1/4"215
24812.8241-3/8"1-1/2"240

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


ORIFICE FLANGE DIMENSIONS OF WELD NECK RF, CLASS 600

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
188.9411/16"5/8"125
114.3413/16"3/4"135
2127811/16"5/8"125
149.2813/16"3/4"135
3168.3813/16"3/4"135
4215.981"7/8"150
6292.1121-1/8"1"180
8349.2121-1/4"1-1/8"195
10431.8161-3/8"1-1/4"220
12489201-3/8"1-1/4"230
14527201-1/2"1-3/8"240
16603.2201-5/8"1-1/2"260
18654201-3/4"1-5/8"280
20723.9241-3/4"1-5/8"300
24838.2242"1-5/8"335

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


ORIFICE FLANGE DIMENSIONS OF WELD NECK RF, CLASS 900

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
188.9411/16"5/8"125
114.3413/16"3/4"135
2127811/16"5/8"125
149.2813/16"3/4"135
3190.581"7/8"150
423581-1/4"1-1/8"180
6317.5121-1/4"1-1/8"195
8393.7121-1/2"1-3/8"230
10469.9161-1/2"1-3/8"240
12533.4201-1/2"1-3/8"260
14558.8201-5/8"1-1/2"280
16616201-3/4"1-5/8"290
18685.8202"1-7/8"330
20749.3202-1/8"2355
24901.7202-1/8"2-1/2"445


ORIFICE FLANGE DIMENSIONS OF WELD NECK RF, CLASS 1500

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
1101.641"7/8"150
123.841-1/8"1-1/4"160
2165.181"7/8"150
190.581-1/8"1"165
3203.281-1/4"1-1/8"185
4241.381-3/8"1-3/8"205
6317.5121-1/2"1-3/8"265
8393.7121-3/4"1-5/8"300
10482.6122"1-7/8"345
12571.6162-1/8"2"380
14635162-3/8"2-1/4"415
16704.8162-5/8"2-1/2"450
18774.7162-7/8"2-3/4"500
20831.8163-1/8"3"545
24990.6163-5/8"3-1/2"620

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


ORIFICE FLANGE DIMENSIONS OF WELD NECK RF, CLASS 2500

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
110841"7/8"150
14641-1/4"1-1/8"180
2171.481-1/8"1"185
196.881-1/4"1-1/8"205
3228.681-3/8"1-1/4"230
427381-5/8"1-1/2"260
6368.382-1/8"2"350
8438.2122-1/8"2"385
10539.8122-5/8"2-1/2"490
12619.1122-7/8"2-3/4"540

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


ORIFICE FLANGE DIMENSIONS OF WELD NECK RTJ, CLASS 600

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


ORIFICE FLANGE DIMENSIONS OF WELD NECK RTJ, CLASS 900

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


ORIFICE FLANGE DIMENSIONS OF WELD NECK RTJ, CLASS 1500

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


ORIFICE FLANGE DIMENSIONS OF WELD NECK RTJ, CLASS 2500 RTJ

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


Download the PDF file for Orifice flange from "Price list and Technical".

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