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.
The Orifice Plate Series MRK is constructed with carrier rings and corner pressure tappings for insertion between flanges.
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Design and calculation standards |
ISO 5167-2, ASME MFC-3M, DIN 19205, Shell Flow Meter Engineering Handbook, L. K. Spink, AGA no. 3 |
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Sizes |
DN 50 - 600, 2" - 24" |
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Pressure rating |
PN 10 - 400, 150 - 2500 lbs |
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Plate thickness |
3 - 10 mm depending on plate size |
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Vent or drain hole |
On request |
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Plate material |
AISI 316, other on request |
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Carrier ring material |
Carbon steel P265GH, AISI 316, other materials on request. |
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Mounting style |
Between flanges with flat or raised face or groove according to DIN 2526, 2513 or 2512, RF according to B 16.5 |
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Pressure taps |
3/8", 1/2" BSP male, Ø 12 mm, 1/2" NPT |
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Tap length |
150 mm, others on request. |
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Tap location |
Normally same side of carrier rings, except for vertical mounting where an angle of minimum 90° is required otherwise 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 |
+/- 0,6 % 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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Shut-off valves and condensing chambers for steam flow measurement. Flange assembly complete with bolts, nuts and gaskets |
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.
