The EMCO Orifice Plate is used as a primary element in flow measurement of liquid, gas and steam applications based on the differential pressure principle. According to this working principle, the orifice plate creates a flow restriction in the pipeline to allow measurement of the resulting pressure drop and flow rate. Our orifice plates have been tested and tried for over 50 years and measure up to the highest industry and compliance standards.
The Orifice Plate Series MES is constructed with a single pressure tapping in all welded construction
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Design and calculation standards |
ISO 5167-2, ASME MFC-3M, DIN 19215, Shell Flow Meter Engineering Handbook, AGA no. 3 |
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Sizes |
2" - 40", DN 50 - 1000 |
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Plate thickness |
10 mm |
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Vent or drain hole |
On request |
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Material |
Carbon steel P235GH, AISI 316, 16Mo3, 13CrMo4-5, 10CrMo9-10, WB 36, X20CrMoV121, other materials on request |
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Mounting style |
Weld ends according to DIN 2559 or ANSI B16.25 |
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Pressure taps |
Ø 21.3 mm, 24 mm, 26.9 mm, ½" BSP male, ½" NPT male |
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Tap length |
150 mm, others on request. |
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Tap location |
Tap location for steam flow: 180°. At least 45° apart for liquid and gas. To be stated with order |
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Orifice plate shapes |
Square edge concentric, square edge eccentric, conical, 1/4 circle, segment. The plate is bevelled on the down stream side except for 1/4 circle orifice plate |
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Marking |
The orifice plate is marked with "+" and"-" and flow direction. |
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Accuracy |
+/- 0,5 % for β < 0,6 and equal to β for β values above 0,6 |
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Pressure loss |
Depending on β, for β equal to 0,6 : ca. 60 % of the differential pressure measured |
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Limits for Reynolds No |
Re > 1260 x β2 D according to ISO 5167 2000 < Re < 108 according to ASME MFC-3M |
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Single and double shut-off valves and condensing chambers for steam flow measurement |
DN |
Ø Inner pipe |
Upstream length ISO 5167 |
Total length ISO 5167 |
Upstream length DIN 19215 |
Total length DIN 19215 |
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50
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45 - 57
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115
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230
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150
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250
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65
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58 - 72
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145
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290
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180
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300
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80
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73 -. 90
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180
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360
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230
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350
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100
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91 - 112
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225
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450
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280
|
400
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125
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113 - 137
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275
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550
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350
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500
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150
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138 - 162
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325
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650
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400
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600
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(175)
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163 - 187
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375
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750
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470
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700
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200
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188 - 225
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450
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900
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570
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800
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250
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226 - 275
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550
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1100
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690
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1000
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300
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276 - 325
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650
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1300
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820
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1200
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350
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326 - 375
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750
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1500
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950
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1400
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400
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376 - 425
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850
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1700
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1050
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1500
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450
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426 - 475
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950
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1900
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1200
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1700
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500
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476 - 550
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1100
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2200
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1370
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2000
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600
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551 - 650
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1300
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2600
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1500
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2000
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700
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651 -750
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1500
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3000
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1500
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2000
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800
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751 - 850
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1700
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3400
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1500
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2000
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900
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851 - 950
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1900
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3800
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1500
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2000
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1000
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951 - 1100
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2200
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4400
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1500
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2000
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Before installation, the orifice plate must be kept clean and protected against corrosion and physical damage. It is also important that you pay careful attention to to the sharp edge of the plate. Once ensured that it is clean, install the orifice plate carefully such that the orifice bore aligns with the centre of the pipeline. Tap location varies depending on whether it is used for liquid, gas or steam. It is not supplied with any safety devices and must not be used for higher pressure, than stated on the name plate. The pipe system must therefore be equipped with a safety device. However, this type of primary element requires no special maintenance.
Download the installation guide above for more detailed information.
