1.1 本指南涵盖了在应用阴极保护之前实施的程序，用于评估储罐是否适合单独使用阴极保护进行升级。 1.2 描述并确定了三种程序，即方法A、B和C。 1.2.1 方法A-- 非侵入性，主要侧重于现场外部环境腐蚀数据的统计和电化学分析。 1.2.2 方法B-- 带外部腐蚀评估的侵入式超声波厚度测试。 1.2.3 方法C-- 侵入性永久记录的目视检查和评估，包括外部腐蚀评估。 1.3 本指南介绍了利用现场和储罐特定数据来确定储罐状况以及采用阴极保护升级此类储罐的适用性的方法和程序。 1.4 虽然本指南提供了评估储罐状况的最低程序，但本指南并未提供通过阴极保护升级储罐的最低安装程序或要求。 1.5 以英寸磅为单位的数值应视为标准。括号中给出的值是国际单位制的数学转换，仅供参考，不被视为标准。 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====== 4.1 本指南提供了三种方法来确定采用阴极保护升级的埋地钢制储罐的适用性。 4.2 本指南可用于评估任何UST，包括不受监管的UST。 4.3 本指南提供了三种替代方法，但不推荐任何特定的方法或应用。选择方法的责任在于用户。 4.4 本指南对供应商提供的信息提出了具体建议，用户应要求并审查这些信息。

1.1 This guide covers procedures to be implemented prior to the application of cathodic protection for evaluating the suitability of a tank for upgrading by cathodic protection alone. 1.2 Three procedures are described and identified as Methods A, B, and C. 1.2.1 Method A— Noninvasive with primary emphasis on statistical and electrochemical analysis of external site environment corrosion data. 1.2.2 Method B— Invasive ultrasonic thickness testing with external corrosion evaluation. 1.2.3 Method C— Invasive permanently recorded visual inspection and evaluation including external corrosion assessment. 1.3 This guide presents the methodology and the procedures utilizing site and tank specific data for determining a tank’s condition and the suitability for such tanks to be upgraded with cathodic protection. 1.4 While this guide provides minimum procedures for assessing a tank's condition, this guide does not provide minimum installation procedures or requirements for upgrades of the tank by cathodic protection. 1.5 The values stated in inch-pound units are to be regarded as standard. The values given in parentheses are mathematical conversions to SI units that are provided for information only and are not considered standard. 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 ====== 4.1 This guide provides three methods for determining the suitability of a buried steel tank to be upgraded with cathodic protection. 4.2 This guide may be used to assess any UST, including non-regulated USTs. 4.3 This guide provides three alternative methods but does not recommend any specific method or application. The responsibility for selection of a method rests with the user. 4.4 This guide has specific suggestions for vendor provided information which should be requested and reviewed by the user.