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  • BSI
    BS EN ISO 9300:2005 Measurement of gas flow by means of critical flow Venturi nozzles
    Edition: 2005
    $500.66
    / user per year

Description of BS EN ISO 9300:2005 2005

This International Standard specifies the geometry and method of use (installation in a system and operating conditions) of critical flow Venturi nozzles (CFVN) used to determine the mass flow-rate of a gas flowing through a system. It also gives the information necessary for calculating the flow-rate and its associated uncertainty.

It is applicable to Venturi nozzles in which the gas flow accelerates to the critical velocity at the throat (this being equal to the local sonic velocity), and only where there is steady flow of single-phase gases. At the critical velocity, the mass flow-rate of the gas flowing through the Venturi nozzle is the maximum possible for the existing upstream conditions while CFVN can only be used within specified limits, e.g. Iimits for the nozzle throat to inlet diameter ratio and throat Reynolds number. This International Standard deals with CFVN for which direct calibration experiments have been made in sufficient number to enable the resulting coefficients to be used with certain predictable limits of uncertainty.

Information is given for cases where the pipeline upstream of the CFVN is of circular cross-section, or it can be assumed that there is a large space upstream of the CFVN or upstream of a set of CFVN mounted in a cluster. The cluster configuration offers the possibility of installing CFVN in parallel, thereby achieving high flow-rates.

For high-accuracy measurement, accurately machined Venturi nozzles are described for low Reynolds number applications.



Standard NumberBS EN ISO 9300:2005
TitleMeasurement of gas flow by means of critical flow Venturi nozzles
StatusWithdrawn
Publication Date2005-10-21
Withdrawn Date2022-08-20
ReplacesBS EN ISO 9300:1995
Identical National Standard OfISO 9300:2005, EN ISO 9300:2005
DescriptorsNozzle flowmeters, Differential-pressure flowmeters, Flow rates, Dimensions, Error analysis, Installation, Reynolds number, Gas flow, Venturi meters, Test equipment, Flow, Mathematical calculations, Temperature, Flowmeters, Design, Flow measurement, Channel flow
ICS17.120.10 Flow in closed conduits
CommitteeCPI/30/2
ISBN0 580 46705 8
PublisherBSI
Pages48

About BSI

BSI Group, also known as the British Standards Institution is the national standards body of the United Kingdom. BSI produces technical standards on a wide range of products and services and also supplies certification and standards-related services to businesses.
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