1.1 本实践分为四个部分:A、B、C和D。这四个部分代表了以前的实践 D7256/D7256M , D4916 , D4702 和 D6518 . 这四个标准是管理煤炭机械采样的四个标准，并已合并为一个文件，以便于这些标准的用户参考。 1.2 A部分的范围见第节 4. . 1.3 B部分的范围见第节 13 . 1.4 C部分的范围见第节 19 . 1.5 D部分的范围见第节 32 . 1.6 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。 有关具体的危险说明，请参阅第节 7. , 16 , 21 , 35 和 38.1.1 . 1.7 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====== 6.1 本规程旨在提供代表所采集煤炭的样本。由于煤炭的可变性和可用的机械采样设备种类繁多，在样品采集过程、采样系统规范设计、设备采购和已安装设备的验收测试的所有阶段都应谨慎。 6.2 从取样系统中取出并进一步准备后（实践 D2013/D2013M )，可以分析样本的许多不同参数。这些参数可以定义地块的价值、其满足规范的能力、其环境影响以及其他属性。

1.1 This practice is divided into four parts: A, B, C, and D. These four parts represent the previous Practices D7256/D7256M , D4916 , D4702 , and D6518 . These four standards are the four that govern the mechanical sampling of coal and have been combined into one document for the ease of reference of the users of these standards. 1.2 The scope of Part A can be found in Section 4 . 1.3 The scope of Part B can be found in Section 13 . 1.4 The scope of Part C can be found in Section 19 . 1.5 The scope of Part D can be found in Section 32 . 1.6 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. For specific hazard statements, see Sections 7 , 16 , 21 , 35 , and 38.1.1 . 1.7 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 ====== 6.1 It is intended that this practice be used to provide a sample representative of the coal from which it is collected. Because of the variability of coal and the wide variety of mechanical sampling equipment available, caution should be used in all stages of the sample collection process, the design of sampling system specifications, the equipment procurement, and the acceptance testing of installed equipment. 6.2 After removal from the sampling system and further preparation (Practice D2013/D2013M ), the sample may be analyzed for a number of different parameters. These parameters may define the lot's value, its ability to meet specifications, its environmental impact, as well as other properties.