Description
EMCO orifice plate are used as primary elements in flow measurement of liquid, gas and steam according to the differential pressure principle
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Design and calculation standards
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ISO 5167-2, ASME MFC-3M, DIN 19215, Shell Flow Meter Engineering Handbook, AGA no. 3
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Sizes
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2" - 40", DN 50 - 1000
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Plate thickness
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10 mm
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Vent or drain hole
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On request
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Material
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Carbon steel P235GH, AISI 316, 16Mo3, 13CrMo4-5, 10CrMo9-10, WB 36, X20CrMoV121, other materials on request
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Mounting style
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Weld ends according to DIN 2559 or ANSI B16.25
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Pressure taps
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Ø 21.3 mm, 24 mm, 26.9 mm, ½" BSP male, ½" NPT male
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Tap length
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150 mm, others on request.
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Tap location
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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
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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
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The orifice plate is marked with "+" and"-" and flow direction.
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Accuracy
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+/- 0,5 % for β < 0,6 and equal to β for β values above 0,6
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Pressure loss
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Depending on β, for β equal to 0,6 : ca. 60 % of the differential pressure measured
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Limits for Reynolds No
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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
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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
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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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