1.1 本规范涵盖饱和蒸汽和过热蒸汽的取样。它适用于在化石燃料锅炉和核锅炉中产生的蒸汽，或者通过任何其他工艺手段产生的蒸汽，其压力足以高于大气压，以建立代表性样品的流动。它也适用于较低和低于大气压的蒸汽，为此必须提供建立代表性流量的装置。 1.2 有关专门取样设备、测试或分析方法的资料，请参阅 ASTM标准年鉴 ，第11.01和11.02卷，涉及水。 1.3 以SI单位表示的值将被视为标准值。括号中给出的值是英寸-磅单位的数学转换，仅供参考，不被视为标准。1.4 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。 1.5 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》中确立的国际公认的标准化原则制定的。 ======意义和用途====== 5.1 为了准确测定其中所有杂质（溶解的化学物质、固体颗粒、吸附在固体颗粒上的化学物质、水滴）的量，必须以提供工艺蒸汽的最具代表性的样品的方式提取和输送蒸汽 ( 1 ) . 3 蒸汽纯度的准确测量提供了可用于确定蒸汽纯度是否在必要限度内以防止下游设备(例如涡轮机和工艺热交换器)的损坏或劣化(腐蚀、固体颗粒侵蚀、流动加速腐蚀和沉积物堆积)的信息。蒸汽中杂质的来源可以包括锅炉水携带、低效的蒸汽分离器、蒸汽中的天然盐溶解度和其他因素。最常指定和分析的参数是钠、二氧化硅、铁、铜和阳离子电导率。

1.1 This practice covers the sampling of saturated and superheated steam. It is applicable to steam produced in fossil fired and nuclear boilers or by any other process means that is at a pressure sufficiently above atmospheric to establish the flow of a representative sample. It is also applicable to steam at lower and subatmospheric pressures for which means must be provided to establish representative flow. 1.2 For information on specialized sampling equipment, tests or methods of analysis, reference should be made to the Annual Book of ASTM Standards , Vols 11.01 and 11.02, relating to water. 1.3 The values stated in SI units are to be regarded as standard. The values given in parentheses are mathematical conversions to inch-pound units that are provided for information only and are not considered 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 It is essential to extract and transport steam in a manner that provides the most representative sample of the process steam in order to accurately determine the amount of all impurities (dissolved chemicals, solid particles, chemicals absorbed on solid particles, water droplets) in it ( 1 ) . 3 An accurate measure of the purity of steam provides information that may be used to determine whether the purity of the steam is within necessary limits to prevent damage or deterioration (corrosion, solid particle erosion, flow-accelerated corrosion, and deposit buildup) of downstream equipment, such as turbines and process heat exchangers. The sources of impurities in the steam can include boiler water carryover, inefficient steam separators, natural salt solubility in the steam and other factors. The most commonly specified and analyzed parameters are sodium, silica, iron, copper, and cation conductivity.