Principle: EMCO orifice plates 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, ISA RP 3.2, Shell Flow Meter Engineering Handbook, L. K. Spink, AGA no. 3
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Sizes
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1" - 24" according to ANSI b 16.36, 50 mm < D < 1000 mm according to ISO 5167-2 and 50 mm < D < 900 mm according to ASME MFC-3M
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Pressure rating
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300 - 2500 lbs RF
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Plate thickness
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3 - 16 mm depending on plate size
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Bore (d)
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d > 12,5 mm
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β (d/D)
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0,2 < β < 0,75 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, Duplex, Monel, 6Mo, Titanium, others on request
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Mounting style
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Between raised face flanges according To ANSI B16.36 or DIN 19214, other standards on request
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Orifice plate shapes
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See above illustration. 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 diameter., bore, material.
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Accuracy
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+/- 0,6 % for β < 0,6 and equal to β for 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 β^2 D according to ISO 5167 2000 < Re < 10^8 according to ASME MFC-3M
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