ISO 6974-5:2014
天然气. 采用气相色谱法对组成及相关不确定性的测定. 第5部分: 氮, 二氧化碳, C1至C5烃类及C6+烃类的等温法

Natural gas - Determination of composition and associated uncertainty by gas chromatography - Part 5: Isothermal method for nitrogen, carbon dioxide, C1 to C5 hydrocarbons and C6+ hydrocarbons

ISO 6974-5:2014 发布历史

This part of this International Standard describes a gas chromatographic method for the quantitative determination of the content of nitrogen, carbon dioxide and C1 to C5 hydrocarbons individually and a composite C6+ measurement, which represents all hydrocarbons of carbon number 6 and above in natural gas samples. It is applicable to the analysis of gases containing constituents within the working ranges given in Table 1. Table 1 — Component working ranges Mole fraction Component Nitrogen N2 Min. 0,1 % Max. 22 Carbon dioxide CO2 Propane C3H80,05 neo-Pentane neo-C5H120,0050,35 C6 + 0,0050,35 Methane Ethane iso-Butane n-Butane iso-Pentane n-Pentane Hexanes + CH4 C2H6 i-C4H10 n-C4H10 i-C5H12 n-C5H120,0515341000,012,00,10,010,0050,00523102,00,350,35 NOTE 1 The working ranges in Table 1 are those for which the method has been shown to be satisfactory, and are offered for guidance. However, there is no reason why wider ranges should not be used, provided that the successful measurement of such wider ranges has been demonstrated. NOTE 2 Hydrocarbons above n-pentane are expressed as the “pseudo-component” C6+ which is measured as one composite peak and calibrated as such. The properties of C6+ are calculated from an extended analysis of the individual C6 and higher hydrocarbons. NOTE 3 Oxygen is not a normal constituent of natural gas and would not be expected to be present in gas sampled to an online instrument. If any oxygen is present as a result of air contamination, it will be measured with the nitrogen. The resulting measured (nitrogen + oxygen) value will be in error to a small extent because of the slight difference between the detector responses of oxygen and nitrogen. NOTE 4 The helium and argon contents are assumed to be sufficiently small and unvarying that they need not be analysed for. NOTE 5 The gas sample shall not contain any hydrocarbon condensate and/or water. 1

ISO 6974-5:2014由国际标准化组织 IX-ISO 发布于 2014-07。

ISO 6974-5:2014 在中国标准分类中归属于: E24 天然气，在国际标准分类中归属于: 75.060 天然气。

ISO 6974-5:2014 发布之时，引用了标准

• ISO 10723:2012 天然气.在线分析系统的性能评定
• ISO 6974-1:2012 天然气.使用气相色谱法对规定的不确定度组分的测定.第1部分:通用导则和成分计算
• ISO 6974-2:2012 天然气.用气相色谱法测定规定的不确定度的组分.第2部分:测量系统的特性和数据处理的统计
• ISO 6976:1995 天燃气.热值、密度和相对密度及化合物沃泊指数的计算
• ISO 7504:2001 气体分析 词汇
• ISO/IEC Guide 98-3:2008 测量的不确定性.第3部分:测量不确定性的表达指南(GUM-1995)

ISO 6974-5:2014的历代版本如下：

• 2014年 ISO 6974-5:2014 天然气. 采用气相色谱法对组成及相关不确定性的测定. 第5部分: 氮, 二氧化碳, C1至C5烃类及C6+烃类的等温法
• 2000年 ISO 6974-5:2000 天然气 用气相色谱法测定规定的不确定度的组分 第5部分:用三柱测定实验室和在线处理用的氮、二氧化碳和碳<上标1>至碳<上标5>和碳<上标6+>的烃类

标准号

ISO 6974-5:2014

发布

2014年

发布单位

国际标准化组织

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ISO 6974-5:2014

 

 

引用标准

ISO 10723:2012 ISO 6974-1:2012 ISO 6974-2:2012 ISO 6976:1995 ISO 7504:2001 ISO/IEC Guide 98-3:2008

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