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3. Venturi-tuyères operating in sonic regime
Sonic venturi nozzles (hereinafter referred to as "sonic nozzles") offer significant advantages over other types of flow reference. They are highly stable over time, their uncertainty is essentially linked to that of the associated measuring instruments, and they remain easy to build and simple to use. However, their flow dynamics depend on the generating pressure upstream of the sonic nozzle. So, to vary the flow through a sonic nozzle, the operator must act on this upstream pressure. Only the presence of a stable pressure source can enable sonic nozzles to be used routinely.
3.1 Sonic neck nozzles
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Venturi-tuyères operating in sonic regime
Checking industrial pressure meters
Bibliography
Websites
French metrology :
http://www.metrologie-francaise.fr/fr/organisation/laboratoires-associes.asp
Bureau International des Poids et Mesures (BIPM) :
International...
Events
The European Flow Measurement Workshop is held in Europe in partnership with CEESI (USA) every year: http://www.efmws.eu/
The North Sea Flow Measurement Workshop takes place every year between Norway and Scotland.
Standards and norms
- Mesure de débit de gaz au moyen de Venturi-tuyères en régime critique. - NF EN ISO 9300 - 2005
- Compteurs de volume de gaz à parois déformables. - NF EN 1359 - 1999
- Mesure de débit des fluides au moyen d'appareils déprimogènes insérés dans des conduites en charge de section circulaire. - NF EN ISO 5167 - 2003
- Compteurs de gaz à turbine. - NF EN 12261 - 2002
- Compteurs de gaz à déplacement...
Regulations
Decree no. 72-866 of September 6, 1972 regulating the category of measuring instruments: gas volume meters. Consolidated version as of May 17, 2017.
Arrêté du 21 octobre 2010 relatif aux compteurs de gaz combustible (NOR : ECEI1025327A). Version consolidée au 21 septembre 2017.
Arrêté du 2 novembre 2016 relatif aux instruments de mesure (NOR: ECFI1628264A). Consolidated version...
Directory
Manufacturers with a calibration bench for gas meters:
ELSTER-INSTROMET (Honeywell), Lognes :
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