外加电流阴极保护中深井阳极的布置

针对某输油管道工程,为保障阴极保护效果的同时,减少阴极保护对周边金属构筑物产生直流杂散电流的干扰。结合现有相关标准规范以及阴极保护干扰的产生机理,对深井阳极的布置位置和阴极保护方案进行对比分析。由于该工程输油管道将分输库整体包围,如库外长输管道全部采取外加电流的阴极保护形式,无论阳极井如何布置,阴极保护电流均有可能对分输库内储罐等金属构筑物产生杂散电流干扰,此时阳极井的位置需从施工、维护、保护电流的发散以及投资等方面比选确定。为了实现外输管道得到有效保护,且最大程度减小阴极保护电流对分输库内储罐等金属构筑物的干扰,可采取对由分支点进出库区的成品油管道与干线绝缘,并对该部分管道施加牺牲阳极保护的形式。

Layout of Deep Well Anode in Applied Current Cathodic Protection

In order to protect effect of cathodic protection and reduce interference of DC stray current to surrounding metal structures for a certain oil pipeline project, the existing relevant standards and specifications combined with the mechanism of cathodic protection were considered to compare and analyze layout of deep well anode and cathodic protection scheme. It is found that the whole oil depot was surrounded by pipelines of this project. As a result, if the applied current cathodic protection was adopted in the foreign pipeline of reservoir, no matter how the anode well was arranged, the cathodic protection current may interfere the metal structure such as the storage tank in the oil depot, and the position of the anode well should be determined from the aspects of construction, maintenance, divergence of protection current and investment. To protect the pipeline effectively and minimize the interference of cathodic protection current to metal structures such as storage tanks in the oil depot, the product oil pipeline between separation point and oil depot can be insulated and sacrificial anode protection might be applied to this part of pipeline.