GB/T 30491.1-2014 in English

《GB/T 30491.1-2014天然气 热力学性质计算 第1部分：输配气中的气相性质》由TC244（全国天然气标准化技术委员会）归口，主管部门为国家标准化管理委员会。
GB/T30491的本部分规定了天然气、含人工掺和物的天然气和其他类似混合物仅以气体状态存在时的体积性质和热性质的计算方法。
本部分适用于输气和配气过程中在一定压力(p)和温度(T)范围内的管输气体。对于体积性质(压缩因子和密度),计算的不确定度约为±0.1%(95%置信区间)。对于热性质[如焓,热容,焦耳-汤姆森(Joule-Thomson)系数,声速],计算的不确定度通常更大一些。

Scope

This part of GB/T 30491 specifies the calculation methods for the volumetric and thermal properties of natural gas, natural gas containing artificial admixtures and other similar mixtures that exist only in gaseous state. This section applies to pipeline transport gas within a certain range of pressure (p) and temperature (T) during gas transmission and distribution. For volumetric properties (compressibility factor and density), the calculated uncertainties are approximately ±0.1% (95% confidence interval). For thermal properties (eg, enthalpy, heat capacity, Joule-Thomson coefficient, sound velocity), the calculated uncertainties are usually larger.