Abstract
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.
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