一、引言CNG加气柱作为母站对外销售的主要计量器具,受外界因素影响较大,如温度、湿度、密度和压力等。为了保证加气柱计量的准确性,维护供需双方的利益,减少贸易纠纷,已成为现实问题。在实际检定工作中,笔者发现用标准表法气体流量标准装置对CNG加气柱进行检定时,在低、中、高3个压力阶段,检定结果差别较大。二、CNG加气柱的构造和工作原理1.CNG加气柱的结构 I. INTRODUCTION CNG filling columns, as the main measuring instruments for external sales of mother stations, are greatly affected by external factors such as temperature, humidity, density and pressure. In order to ensure the accuracy of gas column measurement, safeguard the interests of both supply and demand, reduce trade disputes, has become a real problem. In the actual verification work, I found that with the standard table gas flow standard device CNG filling column for verification, in the low, medium and high pressure stage 3, the test results vary widely. Second, CNG filling column structure and working principle 1.CNG filling column structure