EMCO Orifice Plate with Single Pressure Tapping
Series MEF for Insertion Between Flanges
Principle
EMCO orifice plate are used as primary elements in flow measurement
of liquid, gas and steam according to the differential pressure principle.
Construction
Design and calculation
Standards : ISO 5167, ASME MFC-3M, DIN 19205,
Shell Flow Meter Engineering Handbook,
L. K. Spink, AGA no. 3
Sizes : DN 50 - 1200, 2" - 42"
Pressure rating : PN 10 - 400, 150 - 2500 lbs
Plate thickness : 8 mm
Vent or drain hole : On request
Material : Carbon steel P265GH, AISI 316, 16Mo3,
13CrMo4-5, other materials on request.
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Mounting style : Between flanges with flat or raised face or groove
according to DIN 2526, 2513, 2512, or RF according to B 6.5
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.
Pressure taps : 3/8", 1/2" BSP male, Ø 12 mm, 1/2" NPT
Tap lengths : 150 mm, others on request.
Tap location : At least 45 degrees apart
To be stated with order
Marking : The orifice plate is marked with "+" and"-" and
flow direction.
Technical Data
Accuracy : +
/- 0,6 % for β < 0,6 and equal to β for
β values above 0,6
Pressure loss : Depending on β, for β equal to 0,6 : ca. 60 %
of the differential pressure measured
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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EMCO Orifice Plate Series MEF
Accessories : Shut-off valves and condensing chambers for
steam flow measurement.
Flange assembly complete with bolts, nuts and
gaskets.
Dimensions for DIN flanges
Size Pipe PN 10 PN 16 PN 25 PN 40 PN 64 PN 100 d1=
DN OD D d4 D d4 D d4 D d4 D d4 D d4 D+
50 60.3 54.5 107 54.5 107 54.5 107 54.5 107 54.5 113 53.9 119 1
65 76.1 70.3 127 70.3 127 70.3 127 70.3 127 69.7 138 68.9 144 1
80 88.9 82.5 142 82.5 142 82.5 142 82.5 142 81.7 148 80.9 154 1
100 114.3 107.1 162 107.1 162 107.1 168 107.1 168 106.3 174 104.3 180 1
125 133.0 125.0 192 125.0 192 125.0 194 125.0 194 124.0 210 120.4 217 2
125 139.7 131.7 192 131.7 192 131.7 194 131.7 194 130.7 210 127.1 217 2
150 159.0 150.0 218 150.0 218 150.0 224 150.0 224 147.8 247 144.8 257 2
150 168.3 159.3 218 159.3 218 159.3 224 159.3 224 157.1 247 154.1 257 2
175 193.7 - - 182.9 248 182.5 254 182.5 265 181.1 277 176.1 287 2
200 219.1 207.3 273 207.3 273 206.5 284 206.5 290 204.9 309 199.1 324 2
250 273.0 260.4 328 260.4 329 258.8 340 252.8 352 255.4 364 248.0 391 2
300 323.9 309.7 378 309.7 384 307.9 400 307.9 417 301.9 424 295.5 458 2
350 355.6 341.4 438 339.6 444 339.6 457 338.0 474 330.6 486 323.6 512 2
350 368.0 353.8 438 353.8 444 352.0 457 350.4 474 343.0 486 336.0 512 2
400 406.4 392.2 489 390.4 495 388.8 514 384.4 546 378.0 543 - - 2
400 419.0 404.8 489 403.0 495 401.4 514 397.0 546 390.6 543 - - 2
500 508.0 493.8 594 492.9 617 488.0 624 479.6 628 - - - - 4
600 610.0 595.8 695 592.4 734 588.0 731 - - - - - - 4
700 711.0 695.0 810 693.4 804 686.0 833 - - - - - - 4
800 813.0 797.0 917 793.0 911 784.6 942 - - - - - - 4
900 914.0 896.0 1017 894.0 1011 882.0 1042 - - - - - - 4
All dimensions in mm
D : Inner pipe diameter
d4 : Outer diameter of carrier rings when mounted between flanges with facing according to DIN 2526.
d1 : Inner diameter plate holder. When mounted between flanges with facing according to DIN 2512 and
2513, the inner diameter is D + 1.2 mm.
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