标准号：ISO 6974-5-2000
实施状态：作废
中文名称：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
英文名称：Natural gas - Determination of composition with defined uncertainty by gas chromatography - Part 5: Determination of nitrogen, carbon dioxide and C<(Index)1> to C<(Index)5> and C<(Index)6+> hydrocarbons for a laboratory and on-line process application using three columns
发布日期：2000-04-01
被替代标准：ISO 6974-5-2014
代替标准：ISO 6974-1984;ISO/FDIS 6974-5-1999
采用标准：DIN EN ISO 6974-5-2002,IDT;BS EN ISO 6974-5-2000,IDT;EN ISO 6974-5-2001,IDT;prEN ISO 6974-5-2000,IDT;NF X20-510-5-2003,IDT;X20-510-5PR,IDT;JIS K 2301-2008,MOD;SN EN ISO 6974-5-2001,IDT;OENORM EN ISO 6974-5-2002,IDT;OENORM EN ISO 6974-5-2000,IDT;PN-EN ISO 6974-5-2006,IDT;UNE-EN ISO 6974-5-2003,IDT;GOST 31371.5-2008,IDT
起草单位：ISO/TC 193
标准简介：This part of ISO 6974 describes a gas chromatographic method for the quantitative determination of natural gas constituents using a three-column system. This method is applicable to natural gases of limited range, on-line and automatically calibrating on a regular basis for gas samples not containing any hydrocarbon condensate and/or water. It is applicable to the analysis of gases containing constituents within the mole fraction ranges given in Table 1. These ranges do not represent the limits of detection, but the limits within which the stated precision of the method applies. Although one or more components in a sample may not be detected present, the method can still be applicable.
This part of ISO 6974 is only applicable if used in conjunction with parts 1 and 2 of ISO 6974.
NOTE 1 Hydrocarbons higher than 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 detailed analyses of the individual C6 and higher hydrocarbons by extended analysis or from historical data.
NOTE 2 Oxygen is not a normal constituent of natural gas and would not be expected to be present in gas sampled for an on-line instrument. If any oxygen is present as a result of air contamination, it will be measured with the nitrogen. The resulting (nitrogen + oxygen) value will be in error to a small extent because of the slight difference between detector responses for oxygen and nitrogen. Nonetheless, the result for the natural gas/air mixture will be reasonably accurate since neither component contributes to the calorific value.
NOTE 3 The content of helium and argon are assumed to be negligible and unvarying such that helium and argon need not be determined.
文件格式：PDF
文件大小：144.18KB
文件页数：22
（以上信息更新时间为：2019-11-23）
标准全文下载：
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.pdf
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