Principle:The venturi nozzles are delivered with single pressure tappings or annular ring chamber for minus pressure.
![Venturi_Nozzle-Main[1]](https://www.emcocontrols.com/wp-content/uploads/2022/05/Venturi_Nozzle-Main1.png)
EMCO Venturi nozzle with condensing chambers
for steam flow measurement in a vertical pipe line.
EMCO Venturi nozzle with annular ring chamber for
minus tapping and inlet pipe section.
For dimensions of flanges and weld ends, click the product sheet at the top of the page.
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Design and calculation standards
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ISO 5167-3
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Sizes
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DN 65 - DN 500
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Pressure rating
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PN 10 - 640, 150 - 2500 lbs
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β (d/D)
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d > 50 mm (ISO 5167-3) or according to process data
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Bore (d)
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preferred range 0,316 < β < 0,775
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Material
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Carbon steel P250GH, AISI 316, 22Cr Duplex, 25Cr Duplex, 6Mo. Heat- resistance steels:16Mo3, 13CrMo4-5, 10CrMo9-10, WB 36, X20CrMoV121, F91, F92, other materials on request
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Mounting style
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Weld ends according to EN 9692-1 or ANSI B16.25, flange connection according to DIN, ANSI B 16.5, EN 1092, ISO 7005, NORSOK L-005, or hub connection to specific manufacturer´s standard
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Pressure taps
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½” NPT ext., ½” BSP ext., ½” butt weld ends, ½” or ¾” flanged, others on request.
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Tappings
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Single pressure tappings or 2x4 tappings each arranged with an external annular ring to equalise the pressure.
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Tap lenghts
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150 mm, others on request
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Tap location
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At least 45 degrees apart, for sizes below DN 150. To be stated with order
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Accuracy
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approx. 1,4 – 1,5 % (according to ISO 5167)
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Pressure loss
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approx. 15 % of the differential pressure measured
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Limits for Reynolds No
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15 % of the differential pressure measured
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Accessories |
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shut-off valves
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Condensing chamber for steam flow
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Bracings for tapping support
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2 x D In- and outlet pipe sections, other lengths on request
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