天然气.碳露点计算用气相色谱法要求

[中文适用范围]： 本国际标准详细描述了分析处理后的天然气传输或管道质量的性能要求，以便可以使用适当的状态方程计算碳氢化合物露点温度。 它可适用于最大露点温度（临界温度）在 0 °C 至 – 50 °C 之间的气体。 计算这些最大露点温度时的压力范围为 2 MPa (20 bar) 至 5 MPa (50 bar)。 主要成分使用 ISO 6974（所有部件）进行测量，可测量的成分范围如 ISO 6974-1 中所定义。 本国际标准中给出的程序涵盖了 C5 至 C12 范围内碳氢化合物的测量。 正戊烷使用 ISO 6974（所有部分）进行定量测量，用作桥接组分，所有 C6 和高级碳氢化合物均相对于正戊烷进行测量。 [外文原描述]： ISO 23874:2006 describes the performance requirements for analysis of treated natural gas of transmission or pipeline quality in sufficient detail so that the hydrocarbon dewpoint temperature can be calculated using an appropriate equation of state. ISO 23874:2006 can be applied to gases that have maximum dewpoint temperatures (cricondentherms) between 0 °C and - 50 °C. The pressures at which these maximum dewpoint temperatures are calculated are in the range 2 MPa (20 bar) to 5 MPa (50 bar). The procedure given in ISO 23874:2006 covers the measurement of hydrocarbons in the range C 5 to C 12 . n -Pentane, which is quantitatively measured using ISO 6974 (all parts), is used as a bridge component and all C 6 and higher hydrocarbons are measured relative to n -pentane. Major components are measured using ISO 6974 (all parts) and the ranges of components that can be measured are as defined in ISO 6974-1.