Description
EMCO ISA Nozzles are used as primary elements in flow measurement of steam, liquid and gas according to the differential pressure principal and in accordance with ISO 5167-3. In the ISO 5167-3 standard the geometry and method of use are specified for nozzles to determine the flow-rate of the flowing liquid in the conduit when the nozzles are inserted in a conduit. The ISA 1932 nozzle is made from a solid bar welded into a pipe section. The fact that it is constructed in this way makes it less material intensive compared to a Venturi Nozzle which is made from solid bar. Providing high accuracy and inducing little permanent pressure loss, the ISA 1932 nozzle har has certain advantages which makes it particulerly well suited for the following:
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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 50 - 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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Preferred range 0,3 < β < 0,8
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Material
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Carbon steel P250GH, AISI 316, 16Mo3, 13CrMo4-5, 10CrMo9-10, WB 36, X20CrMoV121, P91, P92, other materials on request
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Mounting style
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Weld ends according to DIN 2559 or ANSI B16.25
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Pressure taps
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Ø 21.3 mm, 24 mm, 26.9mm, 3/8", 1/2" BSP, 1/2" NPT
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Tappings
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Single pressure tappings or annular ring (Type DRS)
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Accuracy
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0,8 % for β < 0,6, (2β - 0,4) % for β > 0,6 (according to ISO 5167-3)
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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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2*10^4 < ReD < 1*10^7 according to ISO 5167-3
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Shut-off valves
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Condensing chamber unit for steam flow
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EMCO ISA 1932 nozzle with condensing chambers
for steam flow measurement in a horizontal or vertical pipe line
