1.1 本试验方法涵盖了确定煤的筛析和根据筛析数据指定煤粒径的程序。原煤和制备（压碎、清洁或筛选）的煤均可通过本试验方法进行试验。 1.2 本试验方法解释了如何根据筛析数据的结果指定煤的粒度，以表示煤炭的销售状况。对于粒度范围不连续的特殊混合物或煤，必须进行充分完整的筛分分析，以正确描述粒度分布。 1.3 本试验方法不适用于确定筛分分析或指定煤粉粒度。（参见 注1 .) 小于等于38μm的粒级[400号美国标准系列]可采用本试验方法中讨论的方法进行处理。 该委员会将制定处理38μm以下粒级的方法[400号]。 注1: 对于燃烧到蒸汽锅炉中的粉末或煤粉，请参阅试验方法 D197 . 1.4 以国际单位制或英寸-磅单位表示的数值应单独视为标准值。每个系统中规定的值不一定是精确的等价物；因此，为确保符合本标准，每个系统应独立使用，且两个系统的值不得组合。 1.5 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。 1.6 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》中确立的国际公认标准化原则制定的。 ====意义和用途====== 4.1 本试验方法涉及将煤筛分为指定粒级，以表征材料的粒度分布，用于进一步加工或商业目的。本标准A部分涵盖了这一点。原煤和制备（压碎、清洁或筛选）的煤均可通过本试验方法进行试验。 4.2 本试验方法适用于除煤粉外的所有类型的煤（见方法 D197 )如送入蒸汽锅炉。低秩煤，即褐煤、亚烟煤和高挥发性沥青C，必须小心干燥并小心处理，以最大限度地减少筛分过程中的变质或尺寸退化。 4.3 本试验方法适用于200 mm[8 in]煤的湿筛或干筛至38μm[第400号美国标准]。38μm以下材料的施胶方法不在本试验方法的范围内。 注2: 通过38μm筛的材料的尺寸通常通过光学显微镜、沉淀、离心、光散射或模糊、表面积测量或其他此类方法进行。有时也会使用辅助技术。 4.4 本试验方法还涉及煤样上部（标称顶部）的名称- 尺寸）和较低（标称底部尺寸）的限制尺寸，以表征材料的特性，用于进一步加工或商业目的。本试验方法B部分对此进行了说明。无烟煤由一个词的描述性术语进一步指定（见 14.4 ). 4.5 本试验方法可能无法收集足够的材料，以满足后续试验程序，如耐洗性分析（试验方法 D4371 ).

1.1 This test method covers procedures for determining the sieve analysis of coal and designating the size of coal from sieve analysis data. Raw as well as prepared (crushed, cleaned or screened) coals can be tested by this test method. 1.2 This test method explains how to designate coal sizes from the results of sieve analysis data in order to represent the condition of the coal as sold. In the case of special mixtures or coals with noncontinuous ranges of sizes, a sufficiently complete sieve analysis must be made to properly describe the size distribution. 1.3 This test method is not applicable for determining the sieve analysis nor for designating the size of pulverized coal. (See Note 1 .) Size fractions down to and including 38 μm [No. 400 U.S.A. Standard Series] can be treated by the methods discussed in this test method. Methods for handling size fractions below 38 μm [No. 400] will be developed by this committee. Note 1: For powdered or pulverized coal as is fired into steam boilers, refer to Test Method D197 . 1.4 The values stated in either SI units or inch-pound units are to be regarded separately as standard. The values stated in each system are not necessarily exact equivalents; therefore, to ensure conformance with the standard, each system shall be used independently of the other, and values from the two systems shall not be combined. 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 ====== 4.1 This test method concerns the sieving of coal into designated size fractions for the purpose of characterizing the material as to its particle size distribution for further processing or for commercial purposes. This is covered in Part A of this standard. Raw, as well as prepared (crushed, cleaned, or screened), coals can be tested by this test method. 4.2 This test method is applicable for all types of coals, except for pulverized coals (see Method D197 ) such as fed into steam boilers. Low rank coals, that is, lignites, subbituminous, and high volatile bituminous C, must be dried with caution and handled with care to minimize deterioration or size degradation during sieving. 4.3 This test method is applicable for the wet or dry-sieving of coal at sizes from 200 mm [8 in.] to 38 μm [No. 400 U.S.A. Standard]. Methods for sizing materials below 38 μm are outside the scope of this test method. Note 2: The sizing of material that passes the 38 μm sieve is normally performed by optical microscopy, sedimentation, centrifugation, light scattering or obfuscation, surface area measurement, or other such methods. Subsieve techniques are also used sometimes. 4.4 This test method also concerns the designation of a coal sample as to its upper (nominal top-size) and lower (nominal bottom-size) limiting sizes for the purpose of characterizing the material for further processing or for commercial purposes. This is covered in Part B of this test method. Anthracite coal is further designated by a one word descriptive term (see 14.4 ). 4.5 Enough material may not be collected by this test method to meet subsequent test procedures, such as washability analyses (Test Method D4371 ).