天然气.压缩因子计算.第3部分:利用物理特性计算

[中文适用范围]： ISO 12213 规定了天然气、含有合成混合物的天然气和类似混合物在混合物只能以气体形式存在的条件下的压缩系数的计算方法。 ISO 12213 的这一部分规定了当上位热值、相对密度和二氧化碳含量以及相关压力和温度已知时压缩系数的计算方法。 如果存在氢（对于含有合成混合物的气体来说通常是这种情况），则还需要知道氢含量。 该方法主要适用于输配作业正常进行的压力p和温度T范围内的管道质量气体，不确定度约为0.1％。 对于更广泛的应用，结果的不确定性会增加（参见附录 F）。 ISO 12213-1 中给出了有关该方法的范围和应用领域的更多详细信息。 [外文原描述]： ISO 12213 specifies methods for the calculation of compression factors of natural gases, natural gases containing a synthetic admixture and similar mixtures at conditions under which the mixture can exist only as a gas. It is divided into three parts: this part, ISO 12213-3:2006, specifies a method for the calculation of compression factors when the superior calorific value, relative density and carbon dioxide content are known, together with the relevant pressures and temperatures. If hydrogen is present, as is often the case for gases with a synthetic admixture, the hydrogen content also needs to be known. The method is primarily applicable to pipeline quality gases within the ranges of pressure p and temperature T at which transmission and distribution operations normally take place, with an uncertainty of about +/-0,1 %. For wider-ranging applications the uncertainty of the results increases.