The Code of Federal Regulations (CFR) is a regulatory collection of general and permanent federal agency rules. This case study is specific to two sections pertaining to the control of corrosion and electrical protection of underground pipe lines and valve stations. The transportation of hazardous liquids is covered by 49 CFR 195 and the transportation of natural gasses by 49 CFR 192. Meeting compliance is obtained with the installation of devices and systems that electrically isolate a cathodically protected pipe line and valve stations from nearby grounded structures and equipment. This study focuses on a cathodically protected pipeline isolation system that exposed a worker to a higherthan- expected voltage level and unexpected hazard when work was performed at a valve station after the installation of a required isolation device.

中文翻译：

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案例研究：地面管道阀门站的规范合规性导致不可预见的冲击危险

联邦法规 (CFR) 是通用和永久联邦机构规则的监管集合。本案例研究专门针对与地下管线和阀门站的腐蚀控制和电气保护有关的两个部分。49 CFR 195 涵盖了危险液体的运输，49 CFR 192 涵盖了天然气的运输。安装设备和系统将阴极保护管道和阀门站与附近的接地结构和设备进行电气隔离，从而达到合规性. 本研究侧重于阴极保护管道隔离系统，该系统在安装所需隔离装置后在阀门站进行工作时，使工人暴露于高于预期的电压水平和意外危险。