1.1 本标准实施规程描述了在标称工作压力（NWP）高达70兆帕（MPag）的加油站使用氢气质量取样装置（HQSA）对高压氢气进行取样的程序。 1.2 本实践不包括对采集样品的分析。 1.3 本规范不适用于高压氢气中颗粒物的取样和测量。颗粒物取样和测量程序见实施规程 D7650 和试验方法 D7651 . 1.4 以SI单位表示的值是标准值。以英寸-磅为单位的数值仅供参考。 1.5 本标准并不旨在解决与其使用相关的所有安全性问题（如果有）。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法规限制的适用性。1.6 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》中确立的国际公认的标准化原则制定的。 ======意义和用途====== 5.1 氢气在高达87.5 MPag（875 barg，12 700 psig）的最大允许工作(MAWP)压力下输送到移动和固定应用。输送的氢气质量是最大化燃料电池效率和寿命的重要因素。在燃料电池进料气体的生产过程中可能发生污染，污染储存容器、站管道和用于燃料输送的燃料管线。收集代表性燃料样品而不引入污染物，即使在收集过程中每种污染物低至十亿分之一体积（ppb(v)），对于评估re中的燃料质量至关重要并确保过量的燃料污染物不会损坏燃料电池或内燃机。 5.2 本实践旨在应用于高压、高纯度氢气；然而，装置设计和取样技术可适用于收集其他燃料电池进料气体。在该实践中使用的许多技术可以应用于较低压力/较低纯度的气流。

1.1 This standard practice describes a sampling procedure of high pressure hydrogen at fueling stations operating at nominal working pressures (NWP) up to 70 megapascals (MPag) using a hydrogen quality sampling apparatus (HQSA). 1.2 This practice does not include the analysis of the acquired sample. 1.3 This practice is not intended for sampling and measuring particulate matter in high pressure hydrogen. For procedures on sampling and measuring particulate matter see Practice D7650 and Test Method D7651 . 1.4 The values stated in SI units are standard. The values stated in inch-pounds are for information only. 1.5 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. 1.6 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 Hydrogen is delivered to mobile and stationary applications at maximum allowable working (MAWP) pressures up to 87.5 MPag (875 barg, 12 700 psig). The quality of hydrogen delivered is a significant factor in maximizing fuel cell efficiency and life span. Contamination can occur during the production of fuel cell feed gases, contaminating storage containers, station tubing, and fuel lines used for fuel delivery. Collection of a representative fuel sample without the introduction of contaminants even as low as parts per billion by volume (ppb(v)) per contaminant during collection is crucial for assessing the quality of fuel in real world applications and ensuring excessive fuel contaminants will not damage fuel cells or internal combustion engines. 5.2 This practice is intended for application to high pressure, high purity hydrogen; however, the apparatus design and sampling techniques may be applicable to collection of other fuel cell feed gases. Many of the techniques used in this practice can be applied to lower pressure/lower purity gas streams.