本标准规定了以下要求:（1）帮助公用事业公司识别可能存在低等级腐蚀高风险的结构；（2） 挖掘并检查选定的结构；（3） 根据腐蚀退化对结构状况进行分类；（4） 根据这些发现，优先考虑需要额外检查的结构；（5）根据需要帮助确定下一步的步骤。本标准仅限于对钢制输电塔、电杆和变电站结构的检查和评估，包括镀锌、自风化和涂漆的低碳钢结构以及其他类似结构。它没有涉及上述混凝土基础的具体检查- 坡度附着点、无涂层接地套管、拉线锚或特定的合格或不合格标准。此外，本标准未提供有关此类结构维修和/或更换的指南或程序。本标准不涉及局部腐蚀，即由于土壤条件、电流等异常因素，在相对较小且有限的钢表面区域内可能发生的腐蚀。就本标准而言，检查区域由过渡区和结构的地下部分组成。检查区域和挖掘深度由公用事业公司酌情确定，以确定腐蚀程度。 本标准不适用于连续浸水环境中的结构。

This standard provides requirements to: (1) help utilities identify structures that may be at a high risk for below-grade corrosion; (2) excavate and inspect the selected structures; (3) categorize the condition of structures based on corrosion degradation; (4) prioritize structures requiring additional inspection based on those findings; and (5) help identify next steps as required. This standard is limited to the inspection and assessment of steel transmission towers, poles, and substation structures, to include galvanized, self-weathering, and painted mild steel structures, as well as other similar structures. It does not address the specific inspection of concrete foundations, above-grade attachment points, noncoated ground sleeves, guy anchors, or specific pass or fail criteria. In addition, this standard does not provide guidelines or procedures regarding repair and/or replacement of these same types of structures. This standard does not address localized corrosion, which is corrosion that can take place in relatively small and limited steel surface areas as a result of unusual factors such as soil conditions, electrical currents, etc. For the purposes of this standard, the area of inspection is composed of the transition zone and below-grade portion of the structure. The inspection area and depth of excavation is determined by the utility as appropriate to identify the extent of corrosion. This standard should not be used to address structures in continuous water immersion environments.