Detection and prevention of AC interference in Jiangxi Natural Gas Pipeline

Several sections of a pipeline operated by Jiangxi Natural Gas Co. Ltd., are close to high-voltage power line or electrified railway. In order to comprehensively evaluate the AC interference risk of these pipe sections, preliminary and detailed detection on AC interference have been conducted according to the European DD CEN-TS 15280-2006 and China GB/T 50698-2011. The detection parameters include AC interference voltage, AC density, the ratio of AC density to DC density and soil resistivity. The places seriously influenced by AC interference are selected to conduct the field remission test and design calculation. The AC interference prevention scheme is established accordingly. In the places where the pipes are severely interfered, the zinc remission strip is laid parallel to the pipes, and the decouplers are installed between the remission strip and the pipeline. A good protection effect has been realized after the implementation of the design scheme, which can provide a reference to the other similar projects.