孔板流量计计量误差现场因素分析

结合现场实际，从气体组分和气体质量、孔板、配套管路和测量仪表、流量计算中各常数等四个方面，对采用标准孔板的长距离天然气管道流量计量系统正负误差的产生原因进行了分析，并结合运行实践，提出了运行中应注意的问题，为提高计量准确度和误差综合分析提供了参考。

An Analysis of Field Factors about Measuring Errors of Orifice Flowmeters

According to the field practice, the causes of positive and negative errors in flow metering system of long-distance natural gas pipeline with standard orifice plate are analyzed from the following aspects, which include the components and quality of gas, the orifice plate, the supporting pipeline, the measuring instrument and various constants in flow calculation. And then, based on the op- erating practice, some problems worthy of drawing much attention in the operation have been proposed in order to provide references for the improvement of measuring accuracy and error comprehensive analysis.