1.1 本试验方法涵盖了天然气管道中水蒸气的快速简单现场测定程序。可用的检测管提供的总测量范围为0.1至40 mg/L，尽管大多数应用将处于该范围的低端（即低于0.5 mg/L）。至少有一家制造商提供的管子可以直接读取每百万立方英尺气体中的水磅数。看见 注1 . 1.2 探测器管通常会受到目标物质以外的气体和蒸汽的干扰。由于使用不同的检测方法，这些干扰可能因品牌而异。有关具体干扰信息，请参阅制造商的说明。醇和二醇会对一些水蒸气管造成干扰，因为这些分子上存在羟基。 1.3 单位- 以国际单位制表示的数值应视为标准。 1.4 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。 1.5 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》中确立的国际公认标准化原则制定的。 ====意义和用途====== 5.1 由于天然气质量规范、水蒸汽对管道材料的腐蚀性以及水蒸汽对利用设备的影响，天然气中水蒸汽的测量非常重要。 5.2 该试验方法提供了廉价的水蒸汽现场筛选。该系统的设计使非技术人员只需经过最少的适当培训即可使用。

1.1 This test method covers a procedure for rapid and simple field determination of water vapor in natural gas pipelines. Available detector tubes provide a total measuring range of 0.1 to 40 mg/L, although the majority of applications will be on the lower end of this range (that is, under 0.5 mg/L). At least one manufacturer provides tubes that read directly in pounds of water per million cubic feet of gas. See Note 1 . 1.2 Detector tubes are usually subject to interferences from gases and vapors other than the target substance. Such interferences may vary among brands because of the use of different detection methods. Consult manufacturer's instructions for specific interference information. Alcohols and glycols will cause interferences on some water vapor tubes because of the presence of the hydroxyl group on those molecules. 1.3 Units— The values stated in SI units are to be regarded as the 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 The measurement of water vapor in natural gas is important because of the gas quality specifications, the corrosive nature of water vapor on pipeline materials, and the effects of water vapor on utilization equipment. 5.2 This test method provides inexpensive field screening of water vapor. The system design is such that it may be used by nontechnical personnel with a minimum of proper training.