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 ISB/2 is constructed with a an integrated unit for mounting between ring type joint (RTJ) flanges.
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Design and calculation standards
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ISO 5167, ASME MFC-3M, ISA RP 3.2, Shell Flow Meter Engineering Handbook, L. K. Spink, AGA no. 3
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Sizes
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2" - 20" according to ANSI B 16.36, 50 mm < D < 1000 mm according to ISO 5167 and 50 mm < D < 900 mm according to ASME MFC-3M.
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Pressure rating
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600 - 2500 lbs RTJ
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Plate thickness
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3 - 9 mm
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Holder width
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27 mm; * 28.5, ** 30 mm, *** 32 mm
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β (d/D)
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Preferred range 0,5 < β < 0,7 for highest accuracy.
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Vent or drain hole
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On request
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Material
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AISI 316, other on request
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Bore
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d > 12,5 mm
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Mounting style
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Between RTJ flanges according to ANSI B16.36, API, other standards on request.
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Connection
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Oval type or octagonal type
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Orifice plate shapes
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Square edge concentric, conical, 1/4 circle, segment
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Handle
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With name plate in AISI 316 with the following inscription : TAG no., serial no., pressure rating, inner pipe dia., bore, material.
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Accuracy
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+/- 0,6 % 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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Size |
600 lbs |
900 lbs |
1500 lbs |
2500 lbs |
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1"
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R16
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R16
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R18
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1½"
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R20
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R20
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R23
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2"
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R23
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R24
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R26
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2½"
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R26
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R27
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R28**
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3"
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R31
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R31
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R35
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R32**
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4"
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R37
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R37
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R39
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6"
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R45
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R45
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R46*
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8"
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R49
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R49
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10"
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R53
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R53
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12"
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R57
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R57
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14"
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R61
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16"
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R65***
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18"
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R69***
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20"
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R73***
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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.
