本标准提供了一个程序，用于（1）识别可能存在较低等级涂层降解风险的输电、配电和变电站结构；（2） 开挖并检查所选结构；（3） 评估现有涂层系统的腐蚀侵蚀和退化对结构的风险水平；（4） 根据这些发现，确定需要修复的结构的优先顺序，确定是否需要涂层修复，如果需要，修复程度如何；（5）如果适用，在结构上涂抹修补涂层。本标准仅限于评估和修复碳钢和镀锌钢输电塔、格栅和变电站结构的地下和过渡区部分的涂层。它不涉及过渡区上方涂层的评估和修复。就本标准而言，该区域包括以下内容:- 坡度部分，过渡区，定义为暴露在坡度以上600毫米（24英寸）的涂层部分。本标准不涉及结构损坏评估、结构维修、耐候钢或结构完整性。本标准不涉及混凝土基础或地上连接点，包括锚杆、连接螺母和无涂层接地套管。本标准不适用于连续浸入环境。本标准并未针对每种特定情况提供涂层系统的指南和维修程序，因为埋地结构可能暴露在复杂多样的条件下。

This standard provides a procedure that shall be used to (1) identify electric transmission, distribution, and substation structures that may be at higher risk for below-grade coating degradation; (2) excavate and inspect the selected structure; (3) assess the level of risk to the structure in terms of corrosion attack and degradation to the existing coating system; (4) prioritize structures to be repaired based on those findings as to whether coating repair is needed and if so, to what extent; and (5) apply repair coatings to the structure, if applicable.This standard is limited to assessment and repair of coating applied below grade and in the transition zone portions of carbon steel and galvanized steel electric transmission towers, grillage, and substation structures. It does not address assessment and repair of coatings above the transition zone. For the purposes of this standard, this area comprises of the below-grade portion, the transition zone, and is defined as that portion of the coating exposed up to 600 mm (24 in) above grade.This standard does not address structural damage assessment, structural repairs, weathering steel, or structural integrity. This standard does not address concrete foundations or above-grade attachment points including anchor rods, attachment nuts, and noncoated ground sleeves. This standard does not address continuous immersion environments. This standard does not provide guidelines and repair procedures for coating systems for every specific situation because of the complexity and diverse nature of conditions to which buried structures may be exposed.