Recently, the measurement standard of pVTt gas flow standard device established by Zhejiang Institute of Metrology successfully passed the on-site assessment of experts in the State Council.
This measurement standard is mainly used for verification and calibration of critical flow Venturi nozzle. The measured flow rate reaches (8~1600)m3/h, and the expanded uncertainty of the device reaches 0.066%(k=2), and the expanded uncertainty of the outflow coefficient of sonic nozzle reaches 0.15%(k=2), which is in the leading level in China. Through the establishment of this standard, the capacity of flow detection in Zhejiang Province has been improved from (0.016~128)m3/h to (0.016~1600)m3/h, which basically realizes the full coverage of nozzle flow range, provides more comprehensive flow value transfer for gas meter industry, flowmeter industry and technical institutions, further promotes the unification of flow value in gas flow field, and escorts the fairness and justice of natural gas trade handover.
(Source: Zhejiang Institute of Metrology)