一、问题的提出天然气的计量大多是采用孔板和双波纹管差压计.在计量过程中仅对孔板上游侧天然气的绝对静压、孔板两侧的差压进行及时的检测记录,以供计算流量用.计量过程中天然气的平均分子量、天然气的流束膨胀系数、天然气的压缩系数、天然气流的温度,前三个参数是把设计时的值,作为常数来用的.而后一个参数是把某瞬时的温度作为全 First, the issue put forward Most of the measurement of natural gas is the use of orifice and double bellows differential pressure gauge in the measurement process only on the upstream side of the orifice of the absolute static pressure, differential pressure on both sides of the orifice plate for timely testing records, For the calculation of flow with the average molecular weight of natural gas during the measurement, the natural gas flow expansion coefficient, natural gas compression factor, natural gas flow temperature, the first three parameters is the design value as a constant to use. The parameter is the temperature of an instant as a whole