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

标准号

ISO 6974-5:2014

发布

2014年

发布单位

国际标准化组织

当前最新

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

适用范围

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相似标准

推荐

ISO 6974-5:2014 中可能用到的仪器设备

谁引用了ISO 6974-5:2014 更多引用