NEN-EN-ISO 9300:2003 Ontw. en

Debietmeting van gasstromen met Venturi-buizen bij kritische stroming

  • Deze norm is ingetrokken sinds 22-09-2005


Over deze norm

Status Ingetrokken
Aantal pagina's 45
Commissie Debiet- en hoeveelheidsmeting
Gepubliceerd op 01-10-2003
Taal Engels
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 applies to Venturi nozzles in which the gas flow accelerates to the critical velocity at the throat (this being equal to the local sonic velocity). 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. This International Standard is applicable only where there is steady flow of single-phase gases. The CFVN dealt with can only be used within specified limits, e.g. Iimits for the nozzle throat to inlet diameter ratio and throat Reynolds number. It 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 in this International Standard for cases where a) the pipeline upstream of the CFVN is of circular cross-section, or b) 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, achieving thereby high flow-rates. For high accuracy measurement, accurately machined Venturi nozzles are described for low Reynolds number applications.


ICS-code 17.120.10
Nederlandse titel Debietmeting van gasstromen met Venturi-buizen bij kritische stroming
Engelse titel Measurement of gas flow by means of critical flow Venturi nozzles
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