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| Uncertainty Evaluation and Verification of 2~4MPa Gas Flow Standard Facility |
| ZHANG Han1,2,WANG Liang1,2,HUANG Dong-hong1,2,DONG Xin-li1,2,Li Chun-hui3,LI Yong1,2,Dong Xiang-min1,2,ZHAO Liu1,ZHANG Qian1 |
1. Beijing Gas Group Company Limited, Beijing 100035, China
2. National City Gas Flowrate Metering Station, Beijing 100035, China
3. National Institute of Metrology, Beijing 100029, China |
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Abstract In order to meet the traceability requirements of city gas flow meters, the gas flow standard facility was built based on master meter method. As the non-fixed usage of master meters and the low temperature of natural gas, the uncertainty evaluation and control of the standard facility were investigated. The results showed that the standard facility used four turbine flowmeters as master meters and has mobility, while the achievable flowrate range was within 60~8600m3/h and the pressure range of 2~4MPa. The uncertainty of the non-point usage of the master meters was controlled based on the curve fitting method, while the uncertainty of the city gas flow standard facility was 0.26% (k=2). Compared with NIM-2014, NIM-2015 was more suitable for master meters with scattered error curves. On this basis, the heat transfer model of low-temperature natural gas flow in pipeline was established. It was found that the dynamic temperature balance of the facility can be achieved through a longer pre-flow time, which can improve the measurement repeatability, the uncertainty of the calibrated flowmeter was 0.32% (k=2).
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Received: 17 March 2022
Published: 18 May 2023
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2023, Vol. 44 
