Principle: EMCO orifice plate are used as primary elements in flow measurement according to the differential pressure principle. The tapping arrangement is corner tapping.
For dimensions of flanges click the product sheet at the top of the page.
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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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300 - 2500 lbs
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Plate thickness
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3 - 8 mm
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β (d/D)
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0,1 < 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”, 300, 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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Integrated with holder. 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
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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 < 0,56 and Re(D) > 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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