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 2003, ASME MFC-3M, ANSI B 16.5, Shell Flow Meter Engineering Handbook
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Sizes
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DN 50 - 600, 2" - 24"
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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 - 8 mm
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β (d/D)
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0,3 < β < 0,75
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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, AISI 304 22Cr Duplex, 16Mo3, 13CrMo4-5, other materials on request.
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Mounting style
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Between flanges with RTJ according to ANSI B 16.5 or to API
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Pressure taps
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Threaded: ½" NPT int. (standard) or ½” BSP. Flanged: ½” and ¾”, 600, 1500 and 2500 lbs RTJ.
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Tap Location
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At least 15° apart, depending on size and pressure rating
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Orifice plate shapes
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Square edge concentric as standard. See above illustrations for other shapes.
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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 0,6ove 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 measuredntial pressure measured
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Limits for Reynolds No
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Re(D) > 5000 for 0,1< β 16000 x β 2 for β > 0,56 according to ISO 5167-2 2003 2000 < Re < 108 according to ASME MFC-3M 108 according to ASME MFC-3M
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