1.1 本试验方法涵盖了航空汽油、飞机涡轮和喷气发动机燃料的氢含量（质量百分比）的估算。 1.2 本试验方法是经验性的，适用于符合jet A、jet A-1、jet B、JP-4、JP-5、JP-7和JP-8型航空汽油或飞机涡轮和喷气发动机燃料规范要求的液态烃燃料。 注1: 试验方法中描述了石油馏分中氢的实验测定程序 2018年1月 , D3701型 , 第5291页 和 D7171 . 注2: 只有当燃料属于明确定义的类别时，碳氢燃料的氢含量的估计才是合理的，对于该类别，氢含量与蒸馏范围、密度和芳香族含量之间的关系是通过对该类别代表性样品的精确实验测量得出的。 即使在这种情况下，也应认识到个别燃料的估计值可能存在大量错误。用于建立本试验方法中所述相关性的燃料由以下规范定义: 燃料 规格 航空汽油 D910型 飞机涡轮和喷气发动机燃料 JP-4和JP-5 密尔-5624 JP-7格式 密耳-38219 JP-8格式 密尔-83133 喷气式飞机A和喷气式飞机A-1 1655美元 其他碳氢化合物 2号柴油 煤油馏分（类似于Jet A） 其他（包括稀释剂、汽油馏分和未识别的混合物） 特殊生产燃料（几乎纯碳氢化合物的商业产品 以及为空军测试生产的特殊高温燃料（HTF）。 纯碳氢化合物 1.3 以国际单位表示的数值应视为标准。 1.3.1 例外情况- 括号中给出的值仅供参考。 1.4 本标准并不旨在解决与其使用相关的所有安全问题（如有）。本标准的使用者有责任在使用前建立适当的安全、健康和环境实践，并确定监管限制的适用性。 1.5 本国际标准是根据世界贸易组织技术性贸易壁垒委员会发布的《关于制定国际标准、指南和建议的原则的决定》中确立的国际公认标准化原则制定的。 =====意义和用途====== 5.1 本试验方法旨在用作无法进行氢含量实验测定的情况下的指南。 表1 显示了用于发展相关性的每个变量范围的摘要。 显示了平均值及其关于平均值的分布，即标准偏差。例如，这表明，用于建立相关性的所有燃料的平均密度为783.5 千克/米 3. 三分之二的样品的密度在733.2 千克/米 3. 和841.3 千克/米 3. ，即正负一个标准差。当方程中使用的变量值在平均值的一个标准偏差内时，相关性最为准确，但在平均值达到两个标准偏差时，相关性是有用的。该相关性的使用可能适用于与航空燃料类似的其他碳氢化合物馏分，但相关性中仅包含有限的非航空燃料数据。 5.2 需要氢气含量来将总燃烧热修正为净燃烧热。净热量用于飞机计算，因为所有燃烧产物都处于气态，但实验方法测量的是总热量。

1.1 This test method covers the estimation of the hydrogen content (mass percent) of aviation gasolines and aircraft turbine and jet engine fuels. 1.2 This test method is empirical and is applicable to liquid hydrocarbon fuels that conform to the requirements of specifications for aviation gasolines or aircraft turbine and jet engine fuels of types Jet A, Jet A-1, Jet B, JP-4, JP-5, JP-7, and JP-8. Note 1: The procedure for the experimental determination of hydrogen in petroleum fractions is described in Test Methods D1018 , D3701 , D5291 , and D7171 . Note 2: The estimation of the hydrogen content of a hydrocarbon fuel is justifiable only when the fuel belongs to a well-defined class for which a relationship among the hydrogen content and the distillation range, density, and aromatic content has been derived from accurate experimental measurements on representative samples of that class. Even in this case, the possibility that the estimates may be in error by large amounts for individual fuels should be recognized. The fuels used to establish the correlation presented in this test method are defined by the following specifications: Fuel Specification Aviation gasolines D910 Aircraft turbine and jet engine fuels JP-4 and JP-5 MIL-DTL-5624 JP-7 MIL-DTL-38219 JP-8 MIL-DTL-83133 Jet A and Jet A-1 D1655 Miscellaneous hydrocarbons No. 2 Diesel fuel Kerosene distillates (similar to Jet A) Miscellaneous (includes thinners, gasoline fractions, and unidentified blends) Special production fuels (commercial products of nearly pure hydrocarbons and special high-temperature fuels (HTF) produced for Air Force tests. Pure hydrocarbons 1.3 The values stated in SI units are to be regarded as the standard. 1.3.1 Exception— The values given in parentheses are for information only. 1.4 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety, health, and environmental practices and determine the applicability of regulatory limitations prior to use. 1.5 This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee. ====== Significance And Use ====== 5.1 This test method is intended for use as a guide in cases in which an experimental determination of hydrogen content is not available. Table 1 shows a summary for the range of each variable used in developing the correlation. The mean value and its distribution about the mean, namely the standard deviation, is shown. This indicates, for example, that the mean density for all fuels used in developing the correlation was 783.5 kg/m 3 and that two thirds of the samples had a density between 733.2 kg/m 3 and 841.3 kg/m 3 , that is, plus and minus one standard deviation. The correlation is most accurate when the values of the variables to be used in the equation are within one standard deviation of the mean, but is useful up to two standard deviations of the mean. The use of this correlation may be applicable to other hydrocarbon distillates similar to aviation fuels, but only limited data on nonaviation fuels were included in the correlation. 5.2 Hydrogen content is required to correct gross heat of combustion to net heat of combustion. Net heat is used in aircraft calculation because all combustion products are in the gaseous state, but experimental methods measure gross heat.