1.1 本规程描述了使用钻孔取芯法从地表获得的样品，通过解吸直接测定煤中气体的方法。它规定了设备结构、样品制备和测试程序以及计算方法的指南。 1.2 测定煤中气体的间接方法（本实践中未涵盖）基于给定压力和温度条件下煤的气体吸收特性或其他经验数据，这些数据将煤中气体与煤阶、覆盖深度或气体排放率等其他参数联系起来。 1.3 本规程涵盖以下两种直接方法，它们仅在最终破碎前允许气体从堆芯或侧壁堆芯解吸的时间内变化: 1.3.1 缓慢解吸法，其中频繁读取气体体积的体积读数（例如，每10 最小至15 min），然后每小时测量几个小时，然后每隔24小时测量一次，直到在很长一段时间内没有或很少的气体被解吸。 1.3.2 快速解吸法，在进行初始解吸气体测量以获得损失气体计算数据后，打开滤罐并将样品转移到碎煤机。 剩余气体体积是在压碎的样品上测量的。 1.4 这种做法仅限于使用岩心或钻孔获得的侧壁岩心的直接方法。该实践可应用于钻屑样品；然而，不建议使用岩屑，因为结果可能会产生误导，并且很难与岩心解吸的结果进行比较。对结果的解释不属于实践的范围。 1.5 单位-- 以国际单位制或英寸磅单位表示的数值应单独视为标准。每个系统中规定的值不一定是完全相等的； 因此，为了确保符合标准，每个系统应独立使用，并且不得将两个系统的值组合使用。 1.6 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。 1.7 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》中确立的国际公认的标准化原则制定的。 ====意义和用途====== 5.1 炭罐解吸法是一种广泛应用的煤中瓦斯检测技术。当标准化为体积/质量并乘以煤炭质量时，气体水平数据用于估计取芯井周围区域的气体体积。

1.1 This practice describes methods for the direct determination of the gas in coal by desorption using samples obtained by drill coring methods from the surface. It sets out guidelines for the equipment construction, sample preparation and testing procedure, and method of calculation. 1.2 Indirect methods for the determination of the gas in coal (not covered in this practice) are based on either the gas absorption characteristics of coal under a given pressure and temperature condition or other empirical data that relate the gas in coal to such other parameters as coal rank, depth of cover, or gas emission rate. 1.3 This practice covers the following two direct methods, which vary only in the time allowed for the gas to desorb from the core, or sidewall core, before final crushing: 1.3.1 The slow desorption method in which volumetric readings of gas volume are taken frequently (for example, every 10 min to 15 min) during the first few hours, followed by hourly measurements for several hours, and then measurements on 24-h intervals until no or very little gas is being desorbed for an extended period of time. 1.3.2 The fast desorption method in which after initial desorbed gas measurements to obtain data for lost gas calculations are taken, the canister is opened and the sample is transferred to the coal crusher. The remaining gas volume is measured on a crushed sample. 1.4 This practice is confined to the direct method using core, or sidewall core obtained from drilling. The practice can be applied to drill cuttings samples; however, the use of cuttings is not recommended because the results may be misleading and are difficult to compare to the results obtained from core desorption. The interpretation of the results does not fall within the scope of the practice. 1.5 Units— 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. 1.6 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. 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 ====== 5.1 Canister desorption is a widely used technique to measure the gas in coal. The gas level data when normalized to volume/mass and multiplied by coal mass is used to estimate the gas volume in place in an area around the cored well.