邻近强电线路时埋地管道交流腐蚀的可能性评估

Assessment of AC-corrosion Possibility of Buried Pipelines with Adjacent Strong Electric Lines

强电线路与埋地管道共用一个走廊时管道上不可避免地产生次生交流干扰。当这一交流干扰电流密度达到一定极限后便会造成管道的交流腐蚀,危及管道设备乃至人身的安全。提出了管道上交流腐蚀的条件及控制指标的新观点,并对管道交流腐蚀的可能性进行评估。

The induced alternative interference current generated on buried pipelines is inevitable when the buried pipelines are paralleled with strong electric lines in a relative short distance. AC-corrosion will occur on the buried pipelines when the density of the induced alternative interference current reaches a specific limit value. This phenomenon will jeopardize the buried pipelines and even threaten the personal safety. A new standpoint about the AC-corrosion conditions and its control index are proposed. More importantly, the AC-corrosion possibility of buried pipelines is properly assessed.