天然气工作级标准装置的能力提升

介绍了国家石油天然气大流量计量站武汉分站工作级标准装置的组成、测量原理、量值溯源方式以及装置校准能力提升的关键措施,并对其不确定度进行评定。重点分析了“绝压+差压测量”的不确定度,实验法评定压缩因子比值的不确定度,以及标准涡轮流量计修正不确定度。利用传递比较法对评定的不确定度进行了验证,结果表明,该标准装置的不确定度为0.13%~0.16%(k=2),可满足开展0.5级及以下天然气流量计的检定要求。

Capacity Improvement of Natural Gas Flow Standard Device

Introduced the composition,measurement principle,traceability method of measurement value and key measures to improve the calibration capacity of the working flow standard device of Wuhan Branch of National Station of Petroleum & Natural Gas flow Measurement,and evaluated its uncertainty. The uncertainty of absolute pressure and differential pressure measurement,the uncertainty of experimental evaluation of compression factor ratio and the uncertainty of standard turbine flowmeter correction are analyzed. The uncertainty of the standard device is 0. 13% ~ 0. 16%( k = 2),which can meet the verification requirements of the natural gas flowmeter of level 0. 5 and below.