Discussion on linear inspection method of on-line chromatographic analyzer for pipeline natural gas
The chromatographic analyzer using GB/T 27894(ISO 6974)calibration normalization meth-od should be systematically evaluated according to the requirements of GB/T 28766(ISO 10723).The linear inspection method of on-line chromatographic analyzer using GB/T 13610(ASTM D1945)and GPA 2261 external standard normalization method is discussed.In this paper,the field test was carried out on an online chromatographic analyzer in a station.The results show that the analysis deviation of CH4 does not meet the reproducibility requirements of GB/T 13610,regardless of the intermediate,aver-age and regression methods used to calculate the response factors.For C2H6,CO2 and N2,the response factors were calculated using intermediate,average and regression methods,and the analytical deviations were all less than the GB/T 13610 reproducibility requirements.It can be seen that the component con-tent is less than 5％,it does not need to be linear check,can be configured according to the intermediate component,and the CH4 content is configured by the difference subtraction method for standard gas.
pipeline natural gasanalysis system performance evaluationexternal standard normaliza-tionlinear checkstandard gas
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