1.1 本规程用于使用热量计测量气体燃料的热值。测定含有水蒸汽的样气的热值需要测量预燃样气以及离开热量计的非冷凝气体的汽相水分。配备适当调节器和算法的仪器可以提供净热值或总热值以及干热值或湿热值结果。 1.2 本规程适用于不时连续运行的在线和在线仪表。 1.3 单位- 以国际单位制表示的数值应视为标准值。本标准不包括其他计量单位。 1.4 本标准并非旨在解决与其使用相关的所有安全问题（如有）。 本标准的用户有责任在使用前制定适当的安全、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（TBT）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 测量燃气特性（如热值）的在线、在线、在线和其他近实时监测系统在各种气体燃料行业以及在其工业过程中生产或使用气体燃料的行业中普遍存在。 特定系统的安装和操作因工艺类型、监管要求、用户目标和性能要求而异。本规程旨在为基于热量计的在线、在线、在线和其他近实时热值监测系统的标准化启动程序、操作程序和质量保证规程提供指导。使用基于气相色谱的仪器测量气体燃料热值的用户参考规程 D7164 .

1.1 This practice is for the determination of the heating value measurement of gaseous fuels using a calorimeter. Heating value determination of sample gasses containing water vapor will require vapor phase moisture measurements of the pre-combustion sample gas as well as the non-condensed gasses exiting the calorimeter. Instruments equipped with appropriate conditioners and algorithms may provide heating value results on a net or gross and dry or wet basis. 1.2 This practice is applicable to at-line and in-line instruments that are operated from time to time on a continuous basis. 1.3 Units— The values stated in SI units are to be regarded as standard. No other units of measurement are included in this standard. 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 On-line, at-line, in-line, and other near-real time monitoring systems that measure fuel gas characteristics, such as heating value, are prevalent in various gaseous fuel industries and in industries either producing or using gaseous fuel in their industrial processes. The installation and operation of particular systems vary depending on process type, regulatory requirements, and the user’s objectives and performance requirements. This practice is intended to provide guidance for standardized start-up procedures, operating procedures, and quality assurance practices for calorimeter based on-line, at-line, in-line, and other near-real time heating value monitoring systems. Users employing gas chromatographic based instrumentation for measurement of gaseous fuel heating value are referred to Practice D7164 .